# Highlights of Quantum Information (DQI) Talks @ APS 2021 March Meeting

American Physics Society (APS) March meeting is one of the largest physics meetings in the world. In 2021, the meeting will be held online due to COVID-19.

To help the community quickly catch up on the work to be presented in this meeting, Paper Digest Team processed all talk abstracts, and generated one highlight sentence (typically the main topic) for each. Readers are encouraged to read these machine generated highlights / summaries to quickly get the main idea of each talk. This article is on the talks related to **Quantum Information (DQI)**.

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#### TABLE : Quantum Information (DQI)

Title | Authors | Highlight | Session | |
---|---|---|---|---|

1 | Loss-tolerant and error-corrected Bell measurement on logical qubits encoded with tree graph states. | Hilaire, Paul; Barnes, Edwin; Economou, Sophia; Grosshans, Fréderic | Here, we achieve both loss-tolerant and error-corrected BSMs by using a logical encoding that uses photonic tree graph state, which can be efficiently produced with a few matter qubits [1], and by introducing two logical BSM schemes, denoted "static" and "dynamic". | Session 1: 2021 Rolf Landauer and Charles H. Bennett Award in Quantum Computing |

2 | Deterministic generation of photonic tree and repeater graph states with a single quantum emitter | Zhan, Yuan; Sun, Shuo | Here, we propose a protocol to deterministically generate photonic tree states of arbitrary size by using only a single quantum emitter [1]. | Session 1: 2021 Rolf Landauer and Charles H. Bennett Award in Quantum Computing |

3 | Realization of a multi-node quantum network using diamond spin qubits: Part I – Enabling technologies | Hermans, Sophie; Pompili, Matteo; Baier, Simon; Beukers, Hans; Hanson, Ronald | In this presentation we discuss the key technological advancements that have enabled the realization of the quantum network: a scalable architecture for the stabilization of the phase of the entangled states of a single link; an improvement of the quantum memory lifetime under network activity; real-time communication and feedback gates across the network. | Session 1: 2021 Rolf Landauer and Charles H. Bennett Award in Quantum Computing |

4 | Realization of a multi-node quantum network using diamond spin qubits: Part II – Experimental results | Pompili, Matteo; Hermans, Sophie; Baier, Simon; Beukers, Hans; Hanson, Ronald | In this presentation we discuss two demonstrations of the capabilities of the quantum network: the heralded generation of genuine multipartite entanglement – a Greenberger-Horne-Zeilinger (GHZ) state – across the three nodes; heralded entanglement swapping in the central node to obtain a Bell state between the outermost nodes. | Session 1: 2021 Rolf Landauer and Charles H. Bennett Award in Quantum Computing |

5 | Towards quantum interference between NV centers and Rare-earth ion solid-state memories | Roehsner, Marie-Christine; Amaral, Gustavo; Loukiantchenko, Elsie; Weaver, Matthew; Sholkina, Mariya; Stolk, Arian; Hanson, Ronald; Tittel, Wolfgang | Here we present our work towards interfering photons emitted from a Nitrogen Vacancy (NV) center, which is well suited to act as a local processing network node, with light emitted from a Tm-based rare-earth quantum memory, which may enable long-range quantum repeaters. | Session 1: 2021 Rolf Landauer and Charles H. Bennett Award in Quantum Computing |

6 | Analytical model for real-world experiments in quantum teleportation | Spiropulu, Maria; Lauk, Nikolai; Escobar, Sergio | Specifically, we develop an analytical model for quantum teleportation of time-bin qubits based on an approach used at the Caltech and Fermilab Quantum Networks. | Session 1: 2021 Rolf Landauer and Charles H. Bennett Award in Quantum Computing |

7 | Practical Semi-Device-Independent Quantum random number generators | Avesani, Marco; Tebyanian, Hamid; Marangon, Davide; Villoresi, Paolo; Vallone, Giuseppe | Here, we describe a series of works where different Semi-DI protocols are proposed and experimentally realized using photonic systems. | Session 1: 2021 Rolf Landauer and Charles H. Bennett Award in Quantum Computing |

8 | Resonant Excitation and Purcell Enhancement of Coherent Nitrogen-Vacancy Centers Coupled to a Micro-Cavity | Weaver, Matthew; Ruf, Maximilian; Van Dam, Suzanne; Herrmann, Yanik; Hanson, Ronald | Here, we overcome this challenge, and demonstrate resonant addressing of individual, fiber-cavity-coupled NV centers, and collection of their Purcell-enhanced coherent photon emission. | Session 1: 2021 Rolf Landauer and Charles H. Bennett Award in Quantum Computing |

9 | Towards inter-city entanglement generation using solid state spins in diamond. | Stolk, Arian; Enden, Kian; Morits, Jaco; Hagen, Ronald; Verlaan, Ad; Cadot, Sidney; Rantwijk, Joris; Roehsner, Marie-Christine; Weaver, Matthew; Zwet, Erwin; Hanson, Ronald | We will present our latest result towards generating indistinguishable photons from separate NV centers down-converted to telecom frequencies, an important prerequisite and stride forward towards creating high-fidelity entanglement over large distances. | Session 1: 2021 Rolf Landauer and Charles H. Bennett Award in Quantum Computing |

10 | Rolf Landauer and Charles H. Bennett Award in Quantum Computing (2021): Toward Quantum Computational Advantage using Photons | Lu, Chao-Yang | We perform experiments with 50 input single-mode squeezed states with high indistinguishability and squeezing parameters, which are fed into a 100-mode ultralow-loss interferometer with full connectivity and random transformation, and sampled using 100 high-efficiency single-photon detectors. | Session 1: 2021 Rolf Landauer and Charles H. Bennett Award in Quantum Computing |

11 | Demonstration of Entanglement-Assisted Communication Surpassing the Ultimate Classical Channel Capacity | Zhang, Zheshen; Hao, Shuhong; Shi, Haowei; Li, Wei; Zhuang, Quntao | The seminal work by Bennett, Shor, Smolin, and Thapliyal showed that pre-shared entanglement between communication parties can be harnessed to increase the rate of reliable classical communication over noisy and lossy channels, known as entanglement-assisted communication (EACOMM). | Session 1: 2021 Rolf Landauer and Charles H. Bennett Award in Quantum Computing |

12 | Manipulation and reconstruction of structured light | Suprano, Alessia; Giordani, Taira; Polino, Emanuele; Emiliani, Sabrina; Acanfora, Francesca; Innocenti, Luca; Majury, Helena; Ferraro, Alessandro; Paternostro, Mauro; Marrucci, Lorenzo; Spagnolo, Nicolò; Sciarrino, Fabio | In particular, we obtained optimal results using both Convolutional Neural Network and Support Vector Machine supported by Principal Component Analysis (PCA). | Session 1: 2021 Rolf Landauer and Charles H. Bennett Award in Quantum Computing |

13 | A Quantum Router Architecture for High-Fidelity Entanglement Flows in Quantum Networks | Lee, Yuan; Bersin, Eric; Dahlberg, Axel; Wehner, Stephanie; Englund, Dirk | Here, we address this with a quantum router architecture comprising many quantum memories connected in a photonic switchboard to broker entanglement flows across quantum networks. | Session 1: 2021 Rolf Landauer and Charles H. Bennett Award in Quantum Computing |

14 | Entanglement formation in continuous-variable random quantum networks | Zhang, Bingzhi; Zhuang, Quntao | We extend the study to continuous-variable quantum networks. | Session 2: Atomic Quantum Systems |

15 | Generation of Photonic Matrix Product States with a Rydberg-blockaded atomic array | WEI, Zhi-Yuan; Malz, Daniel; Gonzalez-Tudela, Alejandro; Cirac, Juan | In this work, we show how one can deterministically generate photonic matrix product states with high bond and physical dimensions with an atomic array if one has access to a Rydberg-blockade mechanism. | Session 2: Atomic Quantum Systems |

16 | Wigner negativity in spin-j systems | Davis, Jack; Kumari, Meenu; Mann, Robert; Ghose, Shohini | We derive a bound on the Wigner negativity of spin cat states that rapidly approaches the true value as spin increases beyond j≈5. | Session 2: Atomic Quantum Systems |

17 | Towards quantum error correction with ions: qubit loss correction and code stitching | Monz, Thomas | In this presentation the first experiments with respect to the correction of qubit-loss, an error that can usually not be corrected, as well as the first implementation of operations between two logical qubits, will be presented. | Session 2: Atomic Quantum Systems |

18 | Optimal state transfer and entanglement generation in power-law interacting systems | Tran, Minh; Deshpande, Abhinav; Guo, Andrew; Lucas, Andrew; Gorshkov, Alexey | We present an optimal protocol for encoding an unknown qubit state into a multiqubit Greenberger-Horne-Zeilinger-like state and, consequently, transferring quantum information in large systems exhibiting power-law (1/r α) interactions. | Session 2: Atomic Quantum Systems |

19 | Continuous protection from inhomogeneous dephasing | Finkelstein, Ran; Lahad, Ohr; Cohen, Itsik; Davidson, Omri; Kiriati, Shai; Poem-Kalogerakis, Eilon; Firstenberg, Ofer | We present a scheme for protecting a qubit from inhomogeneous dephasing. | Session 2: Atomic Quantum Systems |

20 | Robust Encoding of a Qubit in a Molecule | Albert, Victor; Covey, Jacob; Preskill, John | We construct quantum error-correcting codes that embed a finite-dimensional code space in the infinite-dimensional Hilbert space of rotational states of a rigid body. | Session 2: Atomic Quantum Systems |

21 | Universal quantum computation and quantum error correction with ultracold atomic mixtures | Kasper, Valentin; Gonzalez Cuadra, Daniel; Hegde, Apoorva; Xia, Andy; Dauphin, Alexandre; Huber, Felix; Lewenstein, Maciej; Jendrzejewski, Fred; Hauke, Philipp | Here, we propose a mixture of two ultracold atomic species as a platform for universal quantum computation with long-range entangling gates, while providing a natural candidate for quantum error-correction. | Session 2: Atomic Quantum Systems |

22 | Quantification of entanglement in small one-dimensional cluster states | Qin, Zhangjie; Lee, Woo-Ram; Scarola, Vito | I will discuss a simple fidelity measure to diagnose entanglement in cluster state chains based on teleportation across the chain. | Session 2: Atomic Quantum Systems |

23 | Multidimensional Photonic Cluster States Using a Single Spin-Photon Interface Coupled to a Nuclear Register | Michaels, Cathryn; Arjona Martínez, Jesús; Debroux, Romain; Huber, Luca; Stramma, Alexander; Parker, Ryan; Purser, Carola; Gangloff, Dorian; Atature, Mete | Instead, we propose to generate a multi-dimensional cluster state using a single, efficient spin-photon interface coupled to nuclear spins. | Session 2: Atomic Quantum Systems |

24 | Majorana representation of adiabatic and superadiabatic processes in three-level systems | Dogra, Shruti; Vepsäläinen, Antti; Paraoanu, Gheorghe | We show that stimulated Raman adiabatic passage (STIRAP) and its superadiabatic version (saSTIRAP) have a natural geometric two-star representation on the Majorana sphere. | Session 2: Atomic Quantum Systems |

25 | Nonlinear Bell inequality for macroscopic measurements | Bene Watts, Adam; Yunger Halpern, Nicole; Harrow, Aram | We consider agents who have little control, implementing only general operations suited to macroscopic experimentalists: preparing small-scale entanglement and measuring macroscopic properties while suffering from noise. | Session 2: Atomic Quantum Systems |

26 | Observing Quantum Phases and Multiparticle Entanglement Dynamics in a Central Qudit Ising Model | Szabo, Joseph; Trivedi, Nandini | Detecting and understanding these phases as well as the underlying fluctuations and more importantly entanglement physics, is a long-standing issue. | Session 2: Atomic Quantum Systems |

27 | Individual control of nuclear spin qubits in an array of neutral strontium atoms | Lester, Brian; Kotru, Krish; McDonald, Mickey; Notermans, Remy; Cassella, Kayleigh; Ryou, Albert; Kondov, Stanimir; Peng, Lucas; Battaglino, Peter; Lauigan, Joseph; Yarwood, Emme; Coxe, Robin; King, Jonathan; Bloom, Benjamin | Here, we will present initial results on the coherent, site-resolved control of an array of atomic qubits comprised of neutral strontium atoms. | Session 2: Atomic Quantum Systems |

28 | Data transmission by quantum matter-wave modulation | Röpke, Robin; Kerker, Nicole; Stibor, Alexander | In this presentation we demonstrate that also matter-waves can be applied for secure data transfer. | Session 2: Atomic Quantum Systems |

29 | Probing the electric-field noise induced by dielectric surfaces using a trapped ion | Teller, Markus; Fioretto, Dario; Holz, Philip; Schindler, Philipp; Messerer, Viktor; Zou, Yueyang; Blatt, Rainer; Northup, Tracy | I will present a method that predicts the influence of any dielectric structure on a nearby ion. | Session 2: Atomic Quantum Systems |

30 | Multi-zone parallel qubit addressing via multi-wavelength integrated photonics | Niffenegger, Robert; Stuart, Jules; Reens, David; Sorace-Agaskar, Cheryl; Kharas, David; Bramhavar, Suraj; Loh, William; West, Gavin; Maxson, Ryan; Medeiros, Alex; Bruzewicz, Colin; McConnell, Robert; Sage, Jeremy; Chiaverini, John | Laser light was coupled onto the chip via an optical-fiber array, creating an inherently stable optical path that we use to demonstrate qubit coherence resilient to platform vibrations. | Session 2: Atomic Quantum Systems |

31 | Room-temperature single-photon source with near-millisecond built-in memory | Dideriksen, Karsten; Schmieg, Rebecca; zugenmaier, Michael; Polzik, Eugene | Here we demonstrate a single-photon source based on room-temperature memory. | Session 2: Atomic Quantum Systems |

32 | Millisecond electron spin coherence time in 167Er3+: Y2O3 at milliKelvin temperatures | Gupta, Shobhit; Pei, Yuxiang; Zhang, Haito; Yang, Jun; Singh, Manish Kumar; Schuster, David; Zhong, Tian | We perform continuous wave (cw) and pulsed Electron Spin Resonance (ESR) spectroscopy of erbium ( 167Er 3+) dopants in Y 2O 3 [2]. | Session 2: Atomic Quantum Systems |

33 | Multifunctional on-chip storage at telecommunication wavelength for quantum networks | Lei, Mi; Craiciu, Ioana; Rochman, Jake; Bartholomew, John; Faraon, Andrei | We demonstrated optical storage using a hybrid amorphous silicon-Er:YSO photonic crystal resonator evanescently coupled to an ensemble of ions with gold electrodes adjacent to the resonator. | Session 2: Atomic Quantum Systems |

34 | Abelian lattice gauge theory with Rydberg atoms, trapped ions and quantum computers | Meurice, Yannick; Zhang, Jin; Tsai, Shan-Wen; Unmuth-Yockey, Judah; Bazavov, Alexei; Sakai, Ryo; Hostetler, Leon | We propose truncated versions of the Hamiltonian and possible implementations with Rydberg atoms, trapped ions and quantum computers. | Session 2: Atomic Quantum Systems |

35 | Towards simulating 2D effects in lattice gauge theories on a quantum computer | Dellantonio, Luca | We propose a quantum simulation to study properties in two-dimensional quantum electro-dynamics (2D QED). | Session 2: Atomic Quantum Systems |

36 | Building and Benchmarking Trapped Ion Quantum Computers at Honeywell | Stutz, Russell | Here, we will describe system performance metrics of these systems, both component benchmarks as well as more holistic system benchmarks. | Session 2: Atomic Quantum Systems |

37 | Commercial Quantum Computing with Trapped Ions | Kim, Jungsang | In the second part of the talk, I will describe the commercial quantum computer systems developed and operational at IonQ today, and a projection for improving the computational performance in the coming years. | Session 2: Atomic Quantum Systems |

38 | Gauge freedom, quantum measurements, and time-dependent interactions in cavity and circuit QED | SAVASTA, SALVATORE; Di Stefano, Omar; zueco, david; Hughes, Stephen; Nori, Franco | We discuss a modified quantum Rabi model able to provide gauge-invariant physical results in any interaction regime [Nat Phys 15, 803 (2019)]. | Session 2: Atomic Quantum Systems |

39 | Polarization-Modulator based Quantum Key Distribution (QKD) Source | Rezaei, Tahereh; Conrad, Andrew; Sanchez-Rosales, Daniel; DeCesare, Alexandre; Miller, Warner; Gauthier, Daniel; Kwiat, Paul | In this effort, we present progress towards demonstrating a Decoy-State Quantum Key Distribution (QKD) source which is based on a polarization-modulator and an attenuated pulsed laser that is wavelength stable. | Session 2: Atomic Quantum Systems |

40 | Entanglement of macroscopic objects | Kotler, Shlomi; Peterson, Gabriel; Shojaee, Ezad; Lecocq, Florent; Cicak, Katarina; Kwiatkowski, Alex; Geller, Shawn; Glancy, Scott; Knill, Emanuel; Simmonds, Raymond; Aumentado, Jose; Teufel, John | Here we strongly and deterministically entangle two massive mechanical oscillators (~ 70 pg) and directly observe their state. | Session 3: Building Quantum Networks with Hybrid Systems |

41 | Recent advances towards quantum operation of a microwave-mechanical-optical transducer | Mittal, Sarang; Brubaker, Benjamin; Urmey, Maxwell; Kindem, Jonathan; Talamo, Luca; Adachi, Kazemi; Regal, Cindy; Lehnert, Konrad | Here, we present a new electromechanical circuit design that reduces the added noise by improving sideband cooling of the membrane. | Session 3: Building Quantum Networks with Hybrid Systems |

42 | Generalized Matching Condition for Efficient N-Stage Quantum Transduction | Wang, Chiao-Hsuan; Zhang, Mengzhen; Jiang, Liang | We present a generic formalism for N-stage quantum transduction that covers all the leading microwave-to-optical linear conversion approaches such as electro-optics, electro-optomechanics, optomagnonics, and atomic ensembles. | Session 3: Building Quantum Networks with Hybrid Systems |

43 | Upgrades on the Caltech quantum network teleportation system | Spiropulu, Maria; Davis, Samantha; Valivarthi, Raju; Pena, Cristian; Navraez, Lautaro | Here we report upgrades of our system towards remote and replicable installations– key requirements for deployment in real-world settings. | Session 3: Building Quantum Networks with Hybrid Systems |

44 | Toward RF to Optical Quantum Transduction using Brillouin Scattering | Yoon, Taekwan; Jain, Vijay; Mason, David; Chu, Yiwen; Kharel, Prashanta; Frunzio, Luigi; Rakich, Peter; Schoelkopf, Robert | Recent work in cavity optomechanics has demonstrated an unprecedented level of sensitivity in the detection of acoustic phonons through Brillouin scattering in optical cavities. | Session 3: Building Quantum Networks with Hybrid Systems |

45 | Microwave Photonic Crystals for Electro-Optic Quantum Transduction | Khanna, Mihir; Hu, Yang; Ligato, Chris; Purdy, Thomas | We are developing a centimeter scale polymeric dielectric microwave photonic crystal for electro-optic quantum transduction operating in the 5-20 GHz range. | Session 3: Building Quantum Networks with Hybrid Systems |

46 | Millimeter-wave photons in hybrid cavity-QED systems | Suleymanzade, Aziza; Stone, Mark; Taneja, Lavanya; Anferov, Alexander; Kumar, Aishwarya; Simon, Jon; Schuster, David | In this talk, I will present new developments from our hybrid experiment for interfacing single optical and mm-wave photons using Rydberg atoms, including measurement of the hybrid cavity and observation of mm-wave and optical hybridization through coupling to Rydberg states of atoms. | Session 3: Building Quantum Networks with Hybrid Systems |

47 | Measurement of microwave impedance of proximitized nanowires using resonators | Splitthoff, Lukas Johannes; Bargerbos, Arno; Gruenhaupt, Lukas; Wesdorp, Jaap; Pita-Vidal, Marta; Kroll, James; Krogstrup, Peter; Kouwenhoven, Leo; Kou, Angela; Van Heck, Bernard | We investigate the bulk properties of InAs nanowires proximitized by thin-film aluminium, which are a potential platform for topological quantum computing. | Session 3: Building Quantum Networks with Hybrid Systems |

48 | Microwave Andreev bound state spectroscopy of a nanowire Josephson junction in magnetic fields | Wesdorp, Jaap; Vaartjes, Arjen; Roelofs, Sebastiaan; Gruenhaupt, Lukas; Pita Vidal, Marta; Bargerbos, Arno; Splithoff, Lukas; Van Woerkom, David; Krogstrup, Peter; Kouwenhoven, Leo; Van Heck, Bernard; De Lange, Gijs | In contrast to measurements of this aggregate effect, we show a field induced anomalous phase shift in transitions between individual Andreev bound states. | Session 3: Building Quantum Networks with Hybrid Systems |

49 | Cavity QED beyond linear response in topological systems | Perez-Gonzalez, Beatriz; Gómez-León, Álvaro; Platero, Gloria | In this work, we propose a general method to compute the cavity transmission through the photonic Green’s function, which allows to go beyond the usual linear response regime, while studying the interplay between the photonic field and non-trivial topology, captured by the well-known SSH model for TIs in 1D. | Session 3: Building Quantum Networks with Hybrid Systems |

50 | Towards microwave-to-optical transduction using Fermilab’s high quality factor microwave cavities | Zorzetti, Silvia; Lauk, Nikolai; Simon, Christoph | We will present preliminary studies and solutions to determine an optimum transducer design for these cavities. | Session 3: Building Quantum Networks with Hybrid Systems |

51 | Towards a Blueprint for a Quantum Internet | Wehner, Stephanie | In this talk, we will present a series of methods that can be used in order to determine minimal requirements of creating such a network on an existing fiber network infrastructure. | Session 3: Building Quantum Networks with Hybrid Systems |

52 | Quantum Computing with Spins in Silicon | Petta, Jason | We have developed a device architecture that allows for the scalable fabrication of one-dimensional silicon spin qubit arrays [1,2]. | Session 4: Calibration and Gates in Spin Qubit Arrays |

53 | Tunnel coupling measurement of Si quantum dots based on charge sensing | Zhao, Xinyu; Hu, Xuedong | Here we propose an updated theory to account for the valley dynamics and provide a more accurate description of the tunnel coupling measurement in Si QDs. | Session 4: Calibration and Gates in Spin Qubit Arrays |

54 | Systematically tuning a 2xN array of quantum dots with machine learning | Oakes, Giovanni; Duan, Jingyu; Morton, John; Lee, Alpha; Smith, Charles; Gonzalez-Zalba, M Fernando | Inspired by recent demonstrations of industry-fabricated silicon quantum dot bilinear arrays, we develop a theoretical framework to tune a 2×N array of quantum dots, based on the gradients in gate voltage space of different charge transitions that can be measured in multiple two-dimensional charge stability diagrams. | Session 4: Calibration and Gates in Spin Qubit Arrays |

55 | Deep Reinforcement Learning for Efficient Measurement of Quantum Devices | Orbell, Sebastian; Nguyen, Vu; Lennon, Dominic; Moon, Hyungil; Vigneau, Florian; Camezind, Leon; Yu, Liuqi; Zumbuhl, Dominik; Briggs, Andrew; Osborne, Michael; Sejdinovic, Dino; Ares, Natalia | This paper proposes a novel approach to the efficient measurement of quantum devices based on deep reinforcement learning. | Session 4: Calibration and Gates in Spin Qubit Arrays |

56 | Qubits in quantum dot arrays made with all-optical, 300mm wafer lithography | Zwerver, Anne-Marije; Krähenmann, Tobias; Watson, Thomas; Lampert, Lester; Bojarski, Stephanie; George, Hubert C; Mueller, Brennen; Clarke, Jim; Vandersypen, Lieven | Here, we present the first, well-controlled qubits made in quantum dot arrays fabricated in a 300mm process line on an isotopically-enriched 28Si MOS substrate. | Session 4: Calibration and Gates in Spin Qubit Arrays |

57 | 2×2 quantum dot arrays in Si/SiGe | Meyer, Marcel; Unseld, Florian; Wang, Chien-An; Petit, Luca; Amitonov, Sergei; Eenink, Harmen; Hendrickx, Nico; Tsoukalas, Kostas; Zwerver, Anne-Marije; Madzik, Mateusz; Lawrie, William Iain; Brousse, Delphine; Sammak, Amir; Scappucci, Giordano; Vandersypen, Lieven; Veldhorst, Menno | Here, we present the realization of two-dimensional silicon quantum dot arrays, defined in isotopically enriched Si/SiGe heterostructures using single layer and overlapping gate schemes. | Session 4: Calibration and Gates in Spin Qubit Arrays |

58 | Adiabatic Quantum State Transfer in an Array of Spins | Kandel, Yadav; Qiao, Haifeng; Fallahi, Saeed; Gardner, Geoffrey; Manfra, Michael; Nichol, John | Here we demonstrate evidence of adiabatic quantum-state transfer (AQT) of single-spin eigenstates and two-spin entangled states in a chain of four spins in gate defined quantum-dots in a GaAs/AlGaAs heterostructure. | Session 4: Calibration and Gates in Spin Qubit Arrays |

59 | Quantum simulation of an antiferromagnetic Heisenberg chain with gate-defined quantum dots | van Diepen, Cornelis; Hsiao, Tzu-Kan; Mukhopadhyay, Uditendu; Reichl, Christian; Wegscheider, Werner; Vandersypen, Lieven | For this purpose we demonstrate several techniques including many-body spin-state preparation, singlet-triplet correlation measurements, and characterization of the quantum system with energy spectroscopy and global coherent oscillations. | Session 4: Calibration and Gates in Spin Qubit Arrays |

60 | Orthogonal control of tunnel couplings and cascade-based readout in a quantum dot array | Hsiao, Tzu-Kan; van Diepen, Cornelis; Mukhopadhyay, Uditendu; Reichl, Christian; Wegscheider, Werner; Vandersypen, Lieven | Here, we show two new techniques to overcome these issues. | Session 4: Calibration and Gates in Spin Qubit Arrays |

61 | Machine learning enables completely automatic tuning of a quantum device faster than human experts | Lennon, Dominic; Moon, Hyungil; Kirkpatrick, James; van Esbroeck, Nina; Camenzind, Leon; Yu, Liuqi; Vigneau, Florian; Zumbuhl, Dominik; Briggs, Andrew; Osborne, Michael; Sejdinovic, Dino; Laird, Edward; Ares, Natalia | We present a statistical algorithm that utilises machine learning to navigate the entire parameter space. | Session 4: Calibration and Gates in Spin Qubit Arrays |

62 | Utilizing Magnonic Waveguides for Long-Range Spin Correlations | Haas, Michael | Here, we present how by producing strong coupling of spin defects to magnons in ferromagnetic waveguides, we can pave the way towards producing long-distance multi-qubit spin registers on a single chip. | Session 4: Calibration and Gates in Spin Qubit Arrays |

63 | Towards autonomous tuning of noisy quantum dots | Ziegler, Josh; Kalantre, Sandesh; McJunkin, Thomas; Eriksson, Mark; Taylor, Jacob; Zwolak, Justyna | With this approach, we broaden the applicability of autonomous tuning methods to less ideal devices while using a scalable simulation-based ML framework. | Session 4: Calibration and Gates in Spin Qubit Arrays |

64 | Learning the states of quantum dot systems: The ray-based approach | Zwolak, Justyna; McJunkin, Thomas; Kalantre, Sandesh; Neyens, Samuel; MacQuarrie, Evan; Edge, Lisa; Eriksson, Mark; Taylor, Jacob | Now we expand on this work and propose a novel approach where we use 1D traces (“rays”) measured in multiple directions in the gate voltage space to describe the position of the features characterizing each state (i.e., to “fingerprint” the state space). | Session 4: Calibration and Gates in Spin Qubit Arrays |

65 | Free Mode Removal and Mode Decoupling for General Superconducting Quantum Circuits | Ding, Dawei; Ku, Hsiang-Sheng; AQL Members, Additional Contributing; Shi, Yaoyun; Chen, Jianxin; Deng, Chunqing; Zhao, Hui-Hai | We consider a few issues involved in simulating general superconducting circuits. | Session 5: Circuit Theory, Hamiltonian Analysis and Design Tools |

66 | Modeling spectra and coherence properties of superconducting qubits with scQubits | Koch, Jens; Groszkowski, Peter | After a review of the scope of available packages, this talk will focus on an introduction to scQubits, a Python package for superconducting qubits. | Session 5: Circuit Theory, Hamiltonian Analysis and Design Tools |

67 | The quasi-lumped qubit model in circuit quantum electrodynamics (cQED) | Minev, Zlatko; McConkey, Thomas; Gambetta, Jay | We present improvements in agreement over the naive theory when compared to experimental results across 10 devices, which incorporate transmon qubits coupled to varying numbers of resonant structures. | Session 5: Circuit Theory, Hamiltonian Analysis and Design Tools |

68 | Ideal Quantum Nondemolition Readout of a Flux Qubit without Purcell Limitations | Wang, Xin; Miranowicz, Adam; Nori, Franco | The work of R. Dassonneville et al. [2] describes a protocol very similar to ours, and can be viewed as an experimental realization of the QND measurement of qubits via the NPDC mechanism proposed by us much earlier in [1]. | Session 5: Circuit Theory, Hamiltonian Analysis and Design Tools |

69 | Protected qubits based on superconducting circuit topology | Klots, Andrey; McDermott, Robert; Ioffe, Lev | We propose a formalism that allows to determine whether an arbitrary superconducting circuit can act as a protected qubit. | Session 5: Circuit Theory, Hamiltonian Analysis and Design Tools |

70 | Describing qubit dissipation in circuit QED beyond black-box quantization | Hanai, Ryo; McDonald, Alexander; Clerk, Aashish | In this work, we develop analytic methods based on the Keldysh technique and Lindblad perturbation theory that systematically describe such higher-order dissipative effects. | Session 5: Circuit Theory, Hamiltonian Analysis and Design Tools |

71 | Adiabatic timescale of the qubit approximation for flux qubits | Mozgunov, Evgeny; Lidar, Daniel | Our long-term goal is to develop a simplified rigorous theoretical model where the task of qubit design can be defined and leads to a non-trivial optimum for the fabrication and control parameters. | Session 5: Circuit Theory, Hamiltonian Analysis and Design Tools |

72 | First-principles analysis of the cross-resonance gate | Malekakhlagh, Moein; Magesan, Easwar; McKay, David | Here, we present a theoretical study of cross-resonance (CR) covering gate parameters, gate error, spectator qubits and multi-qubit frequency collisions [1]. | Session 5: Circuit Theory, Hamiltonian Analysis and Design Tools |

73 | Quantum computation of Silicon electronic band structure | Cerasoli, Frank; Sherbert, Kyle; Slawinska, Jagoda; Buongiorno Nardelli, Marco | In particular, we present minimal depth circuits implementing the variational quantum eigensolver algorithm and successfully use it to compute the band structure of silicon on a quantum machine for the first time. | Session 5: Circuit Theory, Hamiltonian Analysis and Design Tools |

74 | Flat bands in superconducting circuits with e and 4e tunnel junctions | Chirolli, Luca; Moore, Joel | We show that by exploiting 4e tunnel junctions effectively described by a cos(2φ) energy-phase relation, where tunneling of pairs of Cooper pairs dominates, or by introducing semiconducting wires hosting Majorana end fermions realizing single e tunnel junction via the 4π Josephson effect, we can engineer the Josephson potential and design spectra featuring flat bands and multiple pairs of Dirac points, that can be used to park the qubits in charge noise free states or manipulate Majorana qubits. | Session 5: Circuit Theory, Hamiltonian Analysis and Design Tools |

75 | A Framework for Quantum Device Design—Project Qiskit Metal | Wang, Dennis; Shah, Priti; Facchini, Marco; Blair, John; Drysdale, Jeremy; McConkey, Thomas; Minev, Zlatko | Here, we present an open-source framework to simplify and streamline the design, simulation, and analysis of quantum devices. | Session 5: Circuit Theory, Hamiltonian Analysis and Design Tools |

76 | Kinetic-Inductance Detector Prototype to Distinguish Signal from Two-Level Defect Noise | Forouzani, Neda; Sarabi, Bahman; Moseley, Samuel H.; Wollack, Edward; Noroozian, Omid; Osborn, Kevin | Recognizing that TLSs will generally cause phase noise in KIDs, we develop a device which can potentially allow one to distinguish the intended photon signal from TLS noise. | Session 5: Circuit Theory, Hamiltonian Analysis and Design Tools |

77 | Measurements of Quantum Hamiltonians with Locally-Biased Classical Shadows | Hadfield, Charles; Bravyi, Sergey; Raymond, Rudy; Mezzacapo, Antonio | We consider the problem of estimating expectation values of Hamiltonians, obtained on states prepared on a quantum computer. | Session 5: Circuit Theory, Hamiltonian Analysis and Design Tools |

78 | Tight binding as a numerical tool for diagonalizing superconducting-circuit Hamiltonians | Weiss, Daniel; DeGottardi, Wade; Koch, Jens; Ferguson, David | We adopt solid-state tight-binding techniques for the spectral analysis of superconducting circuits with more than four degrees of freedom. | Session 5: Circuit Theory, Hamiltonian Analysis and Design Tools |

79 | Floquet theory for effective gate Hamiltonian and crosstalk in a tunable coupling superconducting circuit | Le Calonnec, Camille; Petrescu, Alexandru; Di Paolo, Agustin; Leroux, Catherine; Mundada, Pranav; Vrajitoarea, Andrei; Place, Alexander; Houck, Andrew; Blais, Alexandre | Here, we present a method to extract the interaction rates directly from Floquet spectrum generated by the drive without having to run dynamical simulations. | Session 5: Circuit Theory, Hamiltonian Analysis and Design Tools |

80 | Superconducting Qubits: Circuit Theory, Hamiltonian Analysis and Design Tools | Minev, Zlatko | We introduce the energy-participation ratio (EPR) quantization of Josephson circuits, suitable for a diverse class of general superconducting circuits. | Session 5: Circuit Theory, Hamiltonian Analysis and Design Tools |

81 | Hardware-Encoding Grid States in a Non-Reciprocal Superconducting Circuit | Rymarz, Martin; Bosco, Stefano; Ciani, Alessandro; DiVincenzo, David | By taking advantage of the gyrator [1] as a source of non-reciprocity in electrical networks, we propose a superconducting circuit [2], whose effective low-energy dynamics is engineered to approximate the GKP stabilizer Hamiltonian [3]. | Session 5: Circuit Theory, Hamiltonian Analysis and Design Tools |

82 | Driven-dissipative dynamics in superconducting circuit lattices coupled to quantum baths | Du, Botao; Ma, Ruichao | Here, we propose experiments to explore the dynamics of quantum correlations in strongly correlated lattices in the presence of broadband baths. | Session 5: Circuit Theory, Hamiltonian Analysis and Design Tools |

83 | Engineering Dynamical Sweet Spots to Protect Qubits from 1/f Noise | Huang, Ziwen; Mundada, Pranav; Gyenis, Andras; Schuster, David; Houck, Andrew; Koch, Jens | Based on the application of a periodic drive field, we develop a protocol for engineering dynamical sweet spots which reduce the susceptibility of a qubit to low-frequency noise. | Session 5: Circuit Theory, Hamiltonian Analysis and Design Tools |

84 | Simulations of Charge Noise in Quantum Dot Qubits Due to Temperature Fluctuations | Mickelsen, Dan; Carruzzo, Herve; Wu, Ruqian; Yu, Clare; Coppersmith, Sue | We present the results of Monte Carlo simulations of the noise of a two-level system modeled as a Heisenberg spin with a barrier to spin re-orientations in a bath with a fluctuating temperature. | Session 5: Circuit Theory, Hamiltonian Analysis and Design Tools |

85 | Superconducting qubit gates via analytically-derived accelerated adiabatic pulses. | Setiawan, Fnu; Groszkowski, Peter; Ribeiro, Hugo; Clerk, Aashish | Here, we discuss an analytic approach that allows one to go beyond these limitations. | Session 5: Circuit Theory, Hamiltonian Analysis and Design Tools |

86 | Engineering Purely Nonlinear Coupling with the Quarton | Ye, Yufeng; Peng, Kaidong; Naghiloo, Mahdi; Cunningham, Gregory; O’Brien, Kevin | We propose using a quarton to facilitate purely nonlinear coupling between two linearly decoupled transmon qubits [1]. | Session 5: Circuit Theory, Hamiltonian Analysis and Design Tools |

87 | The quantum sine-Gordon model with quantum circuits | Roy, Ananda; Schuricht, Dirk; Hauschild, Johannes; Pollmann, Frank; Saleur, Hubert | In this work, we numerically investigate a one-dimensional, faithful, analog, quantum electronic circuit simulator built out of Josephson junctions for one of the paradigmatic models of an integrable quantum field theory: the quantum sine-Gordon (qSG) model in 1+1 space-time dimensions. | Session 5: Circuit Theory, Hamiltonian Analysis and Design Tools |

88 | Engineering Qubit-Qubit Interactions in Circuit QED Lattices | Kollar, Alicia | Here we present results towards realizing a larger variety interactions, such as frustrated interactions, in which different terms compete and favor different configurations, allowing a spin model to exhibit memory, and hyperbolic interactions, which lead to rapid growth of connectivity and efficient connections. | Session 5: Circuit Theory, Hamiltonian Analysis and Design Tools |

89 | Fast crosstalk-free perfect entangler in a tunable coupling superconducting circuit | Mundada, Pranav; Vrajitoarea, Andrei; Place, Alexander; Di Paolo, Agustin; Le Calonnec, Camille; Petrescu, Alexandru; Leroux, Catherine; Blais, Alexandre; Houck, Andrew | Here, we provide a novel tunable coupler design that harnesses interference due to the higher energy levels to achieve zero static ZZ coupling between the two qubits. | Session 5: Circuit Theory, Hamiltonian Analysis and Design Tools |

90 | Quantum computing with hot silicon and fast germanium qubits | Veldhorst, Menno | Here, I will present our group efforts based on silicon and germanium quantum dots and wills show the realization of a two-dimensional four-qubit quantum processor based on hole spins in germanium quantum dots. | Session 6: Designing High Fidelity Gates for Spin Qubits |

91 | The path to high fidelity multi-qubit gates for quantum dot spin qubits | Russ, Maximilian; Philips, Stephan; Vandersypen, Lieven | We show that advanced pulse shaping techniques commonly used for superconducting qubits [3] can be used to significantly improve the fidelities and the quality factor of gate operations. | Session 6: Designing High Fidelity Gates for Spin Qubits |

92 | Coherent Spin Qubit Transport in Silicon | Yoneda, Jun; Huang, Wister; FENG, MENGKE; Yang, Chih Hwan; Chan, Kok Wai; Tanttu, Tuomo; Gilbert, William; Leon, Ross; Hudson, Fay; Itoh, Kohei; Morello, Andrea; Bartlett, Stephen; Laucht, Arne; Saraiva, Andre; Dzurak, Andrew | In this talk, I will highlight these achievements and discuss the theoretical aspects of coherent spin transport in the context of these experimental results. | Session 6: Designing High Fidelity Gates for Spin Qubits |

93 | Long-range exchange interaction between spin qubits mediated by a superconducting link at finite magnetic field | Gonzalez Rosado, Lucia; Hassler, Fabian; Catelani, Gianluigi | Here, we study a setup where an extension of the tunneling range is obtained by using a superconductor as a quantum mediator. | Session 6: Designing High Fidelity Gates for Spin Qubits |

94 | Coherent multiqubit operations in a six quantum dot linear array | Philips, Stephan; Madzik, Mateusz; Russ, Maximilian; Amitonov, Sergei; Brousse, Delphine; Sammak, Amir; Scappucci, Giordano; Vandersypen, Lieven | In this presentation we will show the first silicon qubit system that achieves universal control beyond 2 qubits [4,5]. | Session 6: Designing High Fidelity Gates for Spin Qubits |

95 | Simultaneous operation of four singlet-triplet qubits in a two-dimensional array of GaAs quantum dots | Fedele, Federico; Chatterjee, Anasua; Fallahi, Saeed; Gardner, Geoffrey; Manfra, Michael; Kuemmeth, Ferdinand | We present the simultaneous coherent manipulation and readout of a two-by-two array of singlet-triplet qubits in GaAs in a geometry where all four qubits can in principle be coupled to a multielectron dot located at the center of the array. | Session 6: Designing High Fidelity Gates for Spin Qubits |

96 | Fast and modular measurement platform for quantum dots tuning into the spin qubit regime | Roux, Marc-Antoine; Njejimana, Larissa; Lachance-Quirion, Dany; Genest, Marc-Antoine; Moras, Mathieu; Messaoudi, Nizar; Crocker, Clayton; Tétrault, Marc-André; Pioro-Ladriere, Michel | By combining this approach with the modularity of the platform, efficient and simultaneous characterization of multiple qubit devices is feasible. | Session 6: Designing High Fidelity Gates for Spin Qubits |

97 | On-chip Multiplexing of Si/SiGe Quantum Devices | Wolfe, Michael; Ward, Daniel; Campbell, DeAnna; Tracy, Lisa; Eriksson, Mark | We present the fabrication and measurement of a multiplexed array that addresses sixteen Si/SiGe quantum devices. | Session 6: Designing High Fidelity Gates for Spin Qubits |

98 | Nonlinear response and crosstalk of strongly driven spin qubits | Xue, Xiao; Mehmandoost, Mohammad; Undseth, Brennan; Russ, Maximilian; Samkharadze, Nodar; Sammak, Amir; Scappucci, Giordano; Dobrovitski, Viatcheslav; Vandersypen, Lieven | To implement deep-circuit quantum algorithms such as quantum error correction, long coherence times and fast operations are needed. | Session 6: Designing High Fidelity Gates for Spin Qubits |

99 | Device and materials considerations for scaling of spin qubit devices | Kotlyar, Roza | In this work we discuss the device advantages and challenges of pitch scaling for spin quantum array designs for Si fin based and buried Si/ SiGe channel based technologies. | Session 6: Designing High Fidelity Gates for Spin Qubits |

100 | Interplay of exchange and superexchange in triple quantum dots | Deng, Kuangyin; Barnes, Edwin | We describe our theoretical efforts to understand the controllability of superexchange interactions in these systems. | Session 6: Designing High Fidelity Gates for Spin Qubits |

101 | Fast spin-valley-based quantum gates in Si with micromagnets | Huang, Peihao; Hu, Xuedong | We reveal that a synthetic spin-orbit field from micromagnets leads to such signatures in spin relaxation, where the interference effect plays a critical role. | Session 6: Designing High Fidelity Gates for Spin Qubits |

102 | Combined Exchange-Measurement Based Qubit Operations in Spin Qubits | Brooks, Matthew; Tahan, Charles | Alternative approaches to gate based double-quantum dot spin-qubit quantum operations by measurements has been investigated by combining exchange-interaction with fast qubit measurements. | Session 6: Designing High Fidelity Gates for Spin Qubits |

103 | Experimental protection of quantum coherence by using a phase-tunable image drive | Sylvain, Bertaina; Vezin, Hervé; de Raedt, Hans; Chiorescu, Irinel | We go beyond their specific case and demonstrate T2~T1 with a new pulse protocol, independent of qubit initial state, in a number of materials with different spin Hamiltonians and environments 3. | Session 7: Dynamical Decoupling and Bath Engineering for Quantum Control |

104 | Floquet engineering of quantum state control by exceptional-point proximity in a single dissipative qubit | Abbasi, Maryam; Naghiloo, Mahdi; Chen, Weijian; Joglekar, Yogesh; Murch, Kater | Our work demonstrates a new method for control over quantum state, highlighting new facets of quantum bath engineering enabled through time-periodic non-Hermitian control. | Session 7: Dynamical Decoupling and Bath Engineering for Quantum Control |

105 | Decoupling dipolar interactions in dense spin ensembles | Joseph, Linta; Alford, Benjamin; Kaufman, Will; Ramanathan, Chandrasekhar | In this work, we study the effectiveness of different dipolar decoupling sequences for a variety of uncorrelated single-spin and correlated multi-spin states in different samples. | Session 7: Dynamical Decoupling and Bath Engineering for Quantum Control |

106 | Adiabatic Quantum Control of Dissipative State Preparation | Doucet, Emery; Kamal, Archana | In this talk I will describe a scheme for Bell state preparation employing only parametric qubit-qubit and qubit-resonator couplings, which afford a large degree of flexibility and control over the stabilized state. | Session 7: Dynamical Decoupling and Bath Engineering for Quantum Control |

107 | Time-optimal Control of a Dissipative Qubit | Lin, Chungwei; Sels, Dries | Time-optimal Control of a Dissipative Qubit | Session 7: Dynamical Decoupling and Bath Engineering for Quantum Control |

108 | Accessing the role of quantum jumps on non-Hermitian dynamics of a superconducting qubit | Chen, Weijian; Abbasi, Maryam; Joglekar, Yogesh; Murch, Kater | We study the dynamics of a dissipative transmon superconducting qubit whose dissipation comes into two parts: a fast coherent nonunitary dissipation (energy loss) and a slow decoherence due to quantum jumps within the qubit. | Session 7: Dynamical Decoupling and Bath Engineering for Quantum Control |

109 | Robust Qudit Hamiltonian Engineering: Applications to NV Centers | Zhou, Hengyun; Leitao, Nathaniel; Martin, Leigh; Douglas, Alexander; Cong, Iris; Makarova, Oksana; Tyler, Matthew; Maskara, Nishad; Choi, Joonhee; Choi, Soonwon; Lukin, Mikhail | In this talk, we outline extensions of robust Hamiltonian engineering techniques to qudit systems. | Session 7: Dynamical Decoupling and Bath Engineering for Quantum Control |

110 | Geometric framework for noise-resistant quantum control | Barnes, Edwin | I will present a new theoretical framework for deriving control waveforms that dynamically combat decoherence by driving qubits in such a way that noise effects destructively interfere and cancel out. | Session 7: Dynamical Decoupling and Bath Engineering for Quantum Control |

111 | Ultra-subharmonic bifurcations in a driven nonlinear oscillator – Part 2/2: harmful and beneficial consequences in Josephson circuits | Xiao, Xu; Venkatraman, Jayameenakshi; Zhang, Yaxing; Devoret, Michel | In this talk, basing ourselves on Part 1, we will discuss different experimental manifestations of USH processes. | Session 7: Dynamical Decoupling and Bath Engineering for Quantum Control |

112 | Ultra-subharmonic bifurcation in a driven nonlinear oscillator – Part 1/2: classical and quantum manifestations | Venkatraman, Jayameenakshi; Xiao, Xu; Zhang, Yaxing; Chowdhury, Shoumik; Devoret, Michel | We show that the time-averaged dissipative dynamics governing any USH process in the low-dissipation regime, whether classical or quantum, can always be represented as motion on an effective static Hamiltonian surface endowed with discrete q-fold symmetry. | Session 7: Dynamical Decoupling and Bath Engineering for Quantum Control |

113 | High-fidelity electron–nuclear spin entangling gates in NV centers via hybrid dynamical decoupling sequences | Dong, Wenzheng; Calderon-Vargas, Fernando.; Economou, Sophia | In this work, we show that the Uhrig decoupling sequence and a hybrid protocol we introduce improve these entangling gates in terms of fidelity, spin control range, and spin selectivity. | Session 7: Dynamical Decoupling and Bath Engineering for Quantum Control |

114 | Robust Qudit Hamiltonian Engineering: A General Theory | Leitao, Nathaniel; Zhou, Hengyun; Martin, Leigh; Cong, Iris; Choi, Soonwon; Lukin, Mikhail | In this talk, we extend this characterization to generic qudit systems with strongly anharmonic level structures. | Session 7: Dynamical Decoupling and Bath Engineering for Quantum Control |

115 | Arbitrary quantum operation on a qudit | Cai, Weizhou; Han, Jiaxiu; Hu, Ling; Ma, Yuwei; Mu, Xianghao; Wang, Weiting; Xu, Yuan; HUA, ZIYUE; Wang, Haiyan; Song, Yipu; Zhang, Jing-Ning; zou, Chang-ling; Sun, Luyan | The demonstrated AQuOs in this talk for complete quantum control would play an important role in quantum information science. | Session 7: Dynamical Decoupling and Bath Engineering for Quantum Control |

116 | A Device for Realizing Error Correction with a Distance-3 Surface Code using Superconducting Circuits | Andersen, Christian Kraglund; Remm, Ants; Lazar, Stefania; Krinner, Sebastian; Lacroix, Nathan; Hellings, Christoph; Di Paolo, Agustin; Swiadek, Francois; Norris, Graham; Hermann, Johannes; Gabureac, Mihai; Blais, Alexandre; Eichler, Christopher; Wallraff, Andreas | In this talk, we discuss the design and realization of a 17 qubit superconducting quantum device used to implement the distance-3 surface code. | Session 8: Experimental Results for Small Quantum Codes |

117 | Quantum Error Correction Using a Distance Three Surface Code with Superconducting Qubits. | Remm, Ants; Andersen, Christian Kraglund; Lazar, Stefania; Krinner, Sebastian; Lacroix, Nathan; Hellings, Christoph; Di Paolo, Agustin; Swiadek, Francois; Norris, Graham; Hermann, Johannes; Gabureac, Mihai; Blais, Alexandre; Eichler, Christopher; Wallraff, Andreas | In this talk, we present our progress towards the operation of a distance d=3 surface code consisting of 17 superconducting qubits. | Session 8: Experimental Results for Small Quantum Codes |

118 | Continuous Error Correction with Parity Measurements | Livingston, William; Blok, Machiel; Atalaya, Juan; Mohseninia, Razieh; Jordan, Andrew; Dressel, Justin; Siddiqi, Irfan | Using a chip with three qubits and connecting each of two pairs to a parity readout resonator, we implement the two parity measurements needed to perform the conventional three-qubit bit-flip code. | Session 8: Experimental Results for Small Quantum Codes |

119 | Exponential suppression of bit or phase flip errors using repetition codes on superconducting qubits (Part II) | Chen, Zijun | In this work, we run distance 3-11 repetition codes and distance 2 surface codes in the Sycamore superconducting qubit architecture. | Session 8: Experimental Results for Small Quantum Codes |

120 | Exponential suppression of bit or phase flip errors using repetition codes on superconducting qubits (Part III) | Satzinger, Kevin | In this work, we run distance 3-11 repetition codes and distance 2 surface codes in the Sycamore superconducting qubit architecture. | Session 8: Experimental Results for Small Quantum Codes |

121 | Operating a logical-qubit size system of superconducting qubits with a heavy-hexagon layout | Takita, Maika; Corcoles, Antonio; Inoue, Ken; Lekuch, Scott; Cross, Andrew; Li, Muyuan; Smolin, John; Zhu, Guanyu; Chow, Jerry; Gambetta, Jay | In this talk, we present experiments on small distance logical qubit size systems with the heavy-hexagon topology. | Session 8: Experimental Results for Small Quantum Codes |

122 | Error correction of a logical grid state qubit by dissipative pumping | de Neeve, Brennan; Nguyen, Thanh Long; Behrle, Tanja; Home, Jonathan | I will present theory and implementation of a dissipative map designed for physically realistic finite GKP codes which performs quantum error correction of a logical qubit implemented in the motion of a single trapped ion. | Session 8: Experimental Results for Small Quantum Codes |

123 | Creation, verification, and scalability of decoherence-free subspaces and noiseless subsystems on superconducting qubits | Quiroz, Gregory; Pokharel, Bibek; Sun, Yifan; Boen, Joseph; Tewala, Lina; Tripathi, Vinay; Kowalsky, Matthew; Williams, Devon; Zhang, Jun-Yi; Titum, Paraj; Wu, Lian-Ao; Schultz, Kevin; Lidar, Daniel | We report on the creation and verification of DD assisted DFS/NS codes on quantum processors provided by the IBM Quantum Experience. | Session 8: Experimental Results for Small Quantum Codes |

124 | Protecting a Bosonic Qubit with Autonomous Quantum Error Correction I – Parity Recovery by Selective Photon Addition | Shirol, Shruti; Gertler, Jeffrey; Baker, Brian; Li, Juliang; Koch, Jens; Wang, Chen | Using reservoir engineering, we construct a dissipative operator, acting on a multiphoton bosonic qubit, that corrects the dominant error of the system: single photon loss. | Session 8: Experimental Results for Small Quantum Codes |

125 | Protecting a Bosonic Qubit with Autonomous Quantum Error Correction II – AQEC Results | Gertler, Jeffrey; Baker, Brian; Li, Juliang; Shirol, Shruti; Koch, Jens; Wang, Chen | Using reservoir engineering, we construct a dissipative operator, acting on a multiphoton bosonic qubit, that corrects the dominant error of the system: single photon loss. | Session 8: Experimental Results for Small Quantum Codes |

126 | Exponential suppression of bit or phase flip errors using repetition codes on superconducting qubits (Part I) | Hong, Sabrina | In this work, we run distance 3-11 repetition codes and distance 2 surface codes in the Sycamore superconducting qubit architecture. | Session 8: Experimental Results for Small Quantum Codes |

127 | Experimental implementation of pair-cat code with superconducting microwave circuits (1/2) | Koottandavida, Akshay; Tsioutsios, Ioannis; Mundhada, Shantanu; Frunzio, Luigi; Devoret, Michel | Experimental implementation of pair-cat code with superconducting microwave circuits (1/2) | Session 8: Experimental Results for Small Quantum Codes |

128 | Experimental implementation of pair-cat code with superconducting microwave circuits (2/2) | Tsioutsios, Ioannis; Koottandavida, Akshay; Mundhada, Shantanu; Frunzio, Luigi; Devoret, Michel | Experimental implementation of pair-cat code with superconducting microwave circuits (2/2) | Session 8: Experimental Results for Small Quantum Codes |

129 | Realistic numerical simulation of a distance-3 surface code implemented on a superconducting chip | Di Paolo, Agustin; Andersen, Christian Kraglund; Remm, Ants; Lazar, Stefania; Krinner, Sebastian; Lacroix, Nathan; Hellings, Christoph; Swiadek, Francois; Norris, Graham; Hermann, Johannes; Gabureac, Mihai; Eichler, Christopher; Wallraff, Andreas; Blais, Alexandre | In this talk, we study the performance of small surface codes implemented on transmon-based superconducting processors with realistic time-domain numerical simulations. | Session 8: Experimental Results for Small Quantum Codes |

130 | Use Alibaba Cloud Quantum Development Platform to Simulate Quantum Error Correction Performance | Huang, Cupjin; Ni, Xiaotong; Zhang, Fang; Newman, Michael; Ding, Dawei; Gao, Xun; Wang, Tenghui; Zhao, Hui-Hai; Wu, Feng; Zhang, Gengyan; Deng, Chunqing; Ku, Hsiang-Sheng; Chen, Jianxin; Shi, Yaoyun | In this talk, we report our result on simulating a distance-3 logical qubit encoded in the 17-qubit surface code using experimental noise parameters for transmon qubits in a planar circuit QED architecture. | Session 8: Experimental Results for Small Quantum Codes |

131 | Superconducting qubits containing through-silicon vias | Hazard, Thomas; Schwartz, Mollie; Woods, Wayne; Rosenberg, Danna; Serniak, Kyle; Das, Rabindra; Kim, David; Knecht, Jeffrey; Mallek, Justin; Melville, Alexander; Niedzielski, Bethany; Yost, Donna-Ruth; Yoder, Jonilyn; Oliver, William | We discuss the design, fabrication, and performance of qubits that leverage the large capacitance density of our compact TSVs. | Session 9: Fabrication and Device Design of Superconducting Qubits |

132 | The Most Coherent Superconducting Qubit? | Somoroff, Aaron; Ficheux, Quentin; Mencia, Ray; Xiong, Haonan; Nesterov, Konstantin; Vavilov, Maxim; Manucharyan, Vladimir | Highly anharmonic artificial atoms present a promising approach to gate-based quantum computing. | Session 9: Fabrication and Device Design of Superconducting Qubits |

133 | Fabrication methods for high-coherence and scalable fluxonium qubits | Qin, Jin; Gao, Ran; Bao, Feng; Deng, Hao; Ku, Hsiang-Sheng; Jiang, Xun; Li, Zhisheng; Ni, Xiaotong; Song, Zhijun; Sun, Hantao; Tang, Chengchun; Wang, Tenghui; Wu, Feng; Yu, Wenlong; Xia, Tian; Zhang, Gengyan; Zhang, Xiaohang; Zhou, Jingwei; Zhu, Xing; Zhao, Hui-Hai; Deng, Chunqing | Here, we report a junction fabrication method to achieve wafer-scale junction array fabrication with a Manhattan-style design. | Session 9: Fabrication and Device Design of Superconducting Qubits |

134 | Development of the quantum processing units (QPUs) at IQM Finland Oy | Liu, Wei; Li, Tianyi; Venkatesh, Manjunath; Chan, Chun Fai; Marxer, Fabian; Jenei, Mate; Yang, Lily; Sevriuk, Vasilii; Ahmad, Hasnain; Kokkoniemi, Roope; Juliusson, Kristinn; Penttilä, Jari; Kotilahti, Janne; Heinsoo, Johannes; Ockeloen-Korppi, Caspar; Orgiazzi, Jean-Luc; Sarkar, Jayanta; Lähteenmäki, Pasi; Chan, Kok Wai; Hassel, Juha; Santos, Jorge Tiago; Goetz, Jan; Vartiainen, Juha; Möttönen, Mikko; Tan, Kuan | Here, we present the fabricated devices and results achieved to date, which includes resonators with high-quality factors > 2e6, long qubit lifetime > 0.07 ms, and 3D integration techniques such as airbridges. | Session 9: Fabrication and Device Design of Superconducting Qubits |

135 | Mode Hybridization and Radiative Properties of an Artificial Atom coupled to a Josephson Junction Array | Sinha, Kanupriya; Khan, Saeed; Tureci, Hakan | We present a theoretical framework that replaces perturbative descriptions of radiative corrections, bridging the perturbative and the non-perturbative limits. | Session 9: Fabrication and Device Design of Superconducting Qubits |

136 | Fast qubit resetting with a quantum-circuit refrigerator | Mörstedt, Timm; Catto, Giacomo; Viitanen, Arto; Li, Tianyi; Liu, Wei; Ikonen, Joni; Sevriuk, Vasilii; Goetz, Jan; Jenei, Máté; Silveri, Matti; Partanen, Matti; Grönberg, Leif; Vesterinen, Visa; Catelani, Gianluigi; Ala-Nissila, Tapio; Möttönen, Mikko | Here, we present an experimental realization of a QCR coupled to a transmon qubit as well as its optimization for fast on-demand qubit reset. | Session 9: Fabrication and Device Design of Superconducting Qubits |

137 | Photon-Number-Dependent Effective Lamb Shift Induced by a Radio-Frequency Quantum-Circuit Refrigerator | Mottonen, Mikko; Viitanen, Arto; Silveri, Matti; Jenei, Máté; Sevriuk, Vasilii; Tan, Kuan; Partanen, Matti; Goetz, Jan; Grönberg, Leif; Lahtinen, Valtteri | We demonstrate [1] a hybrid bosonic-fermionic environment for a linear-resonator mode and observe that the photon number in the environment can dramatically increase both the dissipation and the effective Lamb shift of the mode. | Session 9: Fabrication and Device Design of Superconducting Qubits |

138 | Superconducting circuits for probing quantum materials | Ma, Ruichao; Cadiente, Jeremy; Du, Botao; Iloglu, Gozde | I will describe our progress towards realizing a transmon-like qubit fabricated with superconductor-topological insulator-superconductor junctions. | Session 9: Fabrication and Device Design of Superconducting Qubits |

139 | Fabrication Control of Superconducting Qubit Devices | Niedzielski, Bethany | Motivated by device coherence times, I will discuss our work to understand and control the uniformity of Josephson junctions in the size range best suited for device performance. | Session 9: Fabrication and Device Design of Superconducting Qubits |

140 | Dynamics of superconducting qubit relaxation | Carroll, Malcolm; Rosenblatt, Sami; Kandala, Abhinav | In this work, we probe the spectral and temporal dynamics of T 1 in single junction transmons by measurements of relaxation probabilities at AC-Stark shifted frequencies around the bare transition. | Session 9: Fabrication and Device Design of Superconducting Qubits |

141 | Exciting qubits and excited quasiparticles: the effect of actively pumping a qubit on its environment | Drucker, Niv; Spiecker, Martin; Gusenkova, Daria; Valenti, Francesco; Takmakov, Ivan; Winkel, Patrick; Ustinov, Alexey; Wernsdorfer, Wolfgang; Cohen, Yonatan; Pop, Ioan-Mihai; Gebauer, Richard; Karcher, Nick; Rieger, Denis; Sander, Oliver | Here we shed more light on the subject by utilizing the Quantum Orchestration Platform, a unique control platform that provides ultra-low-latency feedback and great programming flexibility, to carefully design control sequences and explore their effect on the quasiparticle environment of a superconducting fluxonium qubit. | Session 9: Fabrication and Device Design of Superconducting Qubits |

142 | Sub-Kelvin Thermometer for On-Chip Measurements of Microwave Devices Utilizing Two-Level Systems in Superconducting Microresonators | Wheeler, Jordan; vissers, michael; Malnou, Maxime; Gao, Jiansong; Hubmayr, Johannes; Ullom, Joel | We present a superconducting microresonator thermometer based on the TLS-induced frequency shift that is drop-in compatible with cryogenic microwave systems such as qubits. | Session 9: Fabrication and Device Design of Superconducting Qubits |

143 | Flux Qubits Fabricated using a High-Coherence Transmon Fabrication Process | Chistolini, Trevor; Livingston, William; Kreikebaum, John Mark; Santiago, David; Siddiqi, Irfan | After optimizing the fabrication process, we present work investigating flux qubits in 3D cavities, in addition to an 8-qubit ring of alternating flux qubits and transmons with nearest neighbor coupling. | Session 9: Fabrication and Device Design of Superconducting Qubits |

144 | Towards fault-tolerant quantum error correction with spin qubits in diamond | Abobeih, Mohamed; Wang, Yang; Randall, Joe; Loenen, Sjoerd; Bradley, Conor; Terhal, Barbara; Taminiau, Tim Hugo | Here, I will present our results towards the implementation of a fault-tolerant QEC code using a solid-state spin register in diamond. | Session 10: Fault-Tolerance, Gates, and Leakage |

145 | Focus Beyond Quadratic Speedup for Error-Corrected Quantum Advantage | Babbush, Ryan; McClean, Jarrod; Gidney, Craig; Boixo, Sergio; Neven, Hartmut | We discuss conditions under which it would be possible for a modest fault-tolerant quantum computer to realize a runtime advantage by executing a quantum algorithm with only a small polynomial speedup over the best classical alternative. | Session 10: Fault-Tolerance, Gates, and Leakage |

146 | Magic State Distillation for Surface Code for Biased Noise Qubits | Singh, Shraddha; Puri, Shruti | Here we show how the structure of noise in the qubits and entangling gates can be exploited to suppress errors in the injected magic state and reduce the overall resource overheads for magic state distillation. | Session 10: Fault-Tolerance, Gates, and Leakage |

147 | Scalable, pipelined stabilizer measurement scheme and high-fidelity logical operations in a distance-2 surface code | Marques, Jorge; S Moreira, Miguel; Ali, Hany; Muthusubramanian, Nandini; Vlothuizen, Wouter; Beekman, Marc; Zachariadis, Chris; Haider, Nadia; Bruno, Alessandro; DiCarlo, Leonardo | We present the realization and comparison of high-fidelity fault-tolerant and non-fault tolerant logical operations (initialization, gates and measurement) in Surface-7, the distance-2 surface code, implemented in a superconducting quantum processor. | Session 10: Fault-Tolerance, Gates, and Leakage |

148 | Correlation matrix tool for error diagnostics in QEC experiments | Atalaya, Juan; Kafri, Dvir; McEwen, Matthew; Chen, Zijun; Barends, Rami; Kelly, Julian; Chen, Yu; Smelyanskiy, Vadim; Korotkov, Alexander | In this talk, we introduce an error-diagnostic tool that allows us to characterize long-range as well as long-time errors on the error graph caused by, e.g., cross-talk or leakage to non-computational states. | Session 10: Fault-Tolerance, Gates, and Leakage |

149 | Removing leakage-induced correlated errors in superconducting quantum error correction – Experiment | McEwen, Matthew; Kafri, Dvir; Chen, Zijun; Atalaya, Juan; Satzinger, Kevin; Quintana, Chris; Klimov, Paul; Sank, Daniel; Gidney, Craig; Fowler, Austin; Chen, Yu; Smelyanskiy, Vadim; Martinis, John; Neven, Hartmut; Kelly, Julian; Korotkov, Alexander; Petukhov, Andre; Barends, Rami | We present the experimental realisation of a multilevel reset protocol that produces the ground state with an error below 5e-3 within 250 ns, starting from the qubit being in any of the first three excited levels. | Session 10: Fault-Tolerance, Gates, and Leakage |

150 | Toward a topological CNOT between two Kerr-cat qubits: part 1/2 | Cortiñas, Rodrigo; Frattini, Nicholas; Puri, Shruti; Duke, Owen; Lei, Chan U; Girvin, Steven; Devoret, Michel | In the first part of this talk, we review the Kerr-cat qubit and introduce the Hamiltonian of the gate and its construction | Session 10: Fault-Tolerance, Gates, and Leakage |

151 | Toward a topological CNOT between two Kerr-cat qubits: part 2/2 | Frattini, Nicholas; Cortiñas, Rodrigo; Puri, Shruti; Duke, Owen; Lei, Chan U; Girvin, Steven; Devoret, Michel | In part two, we focus on the experimental design and preliminary results. | Session 10: Fault-Tolerance, Gates, and Leakage |

152 | A hardware-efficient leakage-reduction scheme for a transmon-based surface code | Battistel, Francesco; Varbanov, Boris; Terhal, Barbara | We use a microwave pulse to transfer leakage from data-qubits to their readout resonator, where it quickly decays, without significantly affecting the coherence of the computational states. | Session 10: Fault-Tolerance, Gates, and Leakage |

153 | Practical Quantum Error Correction with Surface-Cats | Puri, Shruti | In this talk I will show how we can achieve substantial reductions in the overheads for fault-tolerant quantum error correction by exploiting the underlying structure of noise in qubits encoded in bosonic degrees of freedom. | Session 10: Fault-Tolerance, Gates, and Leakage |

154 | Path-independent quantum gates: general formalism and algebraic structure | Ma, Wen-Long; Jiang, Liang | To address this challenge, we propose a general class of path-independent (PI) quantum gates [1], which integrate quantum error correction and quantum control and therefore can be resilient to ancilla noise. | Session 10: Fault-Tolerance, Gates, and Leakage |

155 | Removing leakage-induced correlated errors in superconducting quantum error correction – Theory | Kafri, Dvir; McEwen, Matthew; Chen, Zijun; Atalaya, Juan; Satzinger, Kevin; Quintana, Chris; Klimov, Paul; Sank, Daniel; Gidney, Craig; Fowler, Austin; Chen, Yu; Smelyanskiy, Vadim; Martinis, John; Neven, Hartmut; Kelly, Julian; Korotkov, Alexander; Petukhov, Andre; Barends, Rami | We develop a three-phase semiclassical model describing the protocol and find good agreement with experiment. | Session 10: Fault-Tolerance, Gates, and Leakage |

156 | Universal Fault-Tolerant Quantum Computing with Stabiliser Code Families | Webster, Paul; Vasmer, Michael; Scruby, Thomas; Bartlett, Stephen | With this definition, we present a no-go theorem that precludes a universal set of unitary fault-tolerant logical operator implementations for a wide range of stabiliser code families, including concatenated codes and conventional topological stabiliser codes such as surface and colour codes. | Session 10: Fault-Tolerance, Gates, and Leakage |

157 | High-fidelity gates on fluxonium qubits | Ficheux, Quentin; Xiong, Haonan; Somoroff, Aaron; Nguyen, Long; Nesterov, Konstantin; Vavilov, Maxim; Manucharyan, Vladimir | We describe recent progress in the implementation of high-fidelity single and two-qubit gates in fluxonium circuits. | Session 11: Fluxonium Qubits |

158 | High-fidelity entangling gates for fluxonium qubits | Wu, Feng; Ding, Dawei; Wang, Tenghui; Ni, Xiaotong; Ku, Hsiang-Sheng; Zhang, Gengyan; AQL Members, Additional Contributing; Shi, Yaoyun; Chen, Jianxin; Deng, Chunqing; Zhao, Hui-Hai | In this work, we theoretically analyze and compare various two-qubit gate schemes with all-microwave drives, as well as those with qubit frequency tuning, and numerically demonstrate how to obtain high fidelities. | Session 11: Fluxonium Qubits |

159 | Two Qubit Cross Resonance Gate in Fluxonium | Bryon, Jacob Elvin; Ritter, Martin; Amouzegar, Maya; Kollar, Alicia; Houck, Andrew | We propose a scheme to drive a CR gate in two fluxonium qubits coupled via an on-chip cavity and present the experimental progress in this effort. | Session 11: Fluxonium Qubits |

160 | Cross resonance gate for a capacitively coupled two fluxonium device | Dogan, Ebru; Rosenstock, Dario; Ficheux, Quentin; Xiong, Haonan; Somoroff, Aaron; Mencia, Ray; Nesterov, Konstantin; Vavilov, Maxim; Manucharyan, Vladimir; Wang, Chen | We will report our progress about the tune up procedures and the benchmarking for a cross resonance gate on a capacitively coupled two fluxonium device in a 3D cavity resonator. | Session 11: Fluxonium Qubits |

161 | Entanglement of fluxonium qubits without leaving the computational space | Nesterov, Konstantin; Ficheux, Quentin; Wang, Chen; Manucharyan, Vladimir; Vavilov, Maxim | Entanglement of fluxonium qubits without leaving the computational space | Session 11: Fluxonium Qubits |

162 | Cavity-photon induced state transitions in a coupled Fluxonium qubit system | Stevens, Jeremy; Jouan, Alexis; Cottet, Nathanael; Nguyen, Long; Somoroff, Aaron; Ficheux, Quentin; Bienfait, Audrey; Manucharyan, Vladimir; Huard, Benjamin | Superconducting qubits are a subject of intense research as a platform for scalable quantum computing. | Session 11: Fluxonium Qubits |

163 | Excitation Dynamics in an Inductively Coupled Fluxonium Chain | Ozguler, A. Baris; Manucharyan, Vladimir; Vavilov, Maxim | We propose a highly coherent near-term quantum simulator based on the fluxonium qubits with inductive coupling. | Session 11: Fluxonium Qubits |

164 | Understanding and mitigating decoherence in fluxonium qubits – Energy relaxation | Sun, Hantao; Wu, Feng; Ku, Hsiang-Sheng; Deng, Hao; Ding, Dawei; Gao, Ran; Gao, Xun; Jiang, Xun; Li, Zhisheng; Ni, Xiaotong; Qin, Jin; Song, Zhijun; Tang, Chengchun; Wang, Tenghui; Yu, Wenlong; Xia, Tian; Zhang, Gengyan; Zhang, Xiaohang; Zhou, Jingwei; Zhu, Xing; AQL Members, Additional Contributing; Shi, Yaoyun; Chen, Jianxin; Zhao, Hui-Hai; Deng, Chunqing | We find that spurious tunneling two-level systems and excess quasiparticles are the dominant sources of energy relaxation. | Session 11: Fluxonium Qubits |

165 | Novel two-qubit gates for the light fluxonium qubit | Cohen, Joachim; Di Paolo, Agustin; Chen, Larry; Chistolini, Trevor; Kreikebaum, John Mark; Nguyen, Long; Naik, Ravi; Santiago, David; Siddiqi, Irfan; Blais, Alexandre | Here, we introduce a two-qubit gate for the light fluxonium in a parameter regime where the coherence times are predicted to be long and that is within the reach of current circuit-QED technology. | Session 11: Fluxonium Qubits |

166 | Toward an ultra-high fidelity and scalable fluxonium quantum processor | Ku, Hsiang-Sheng; Deng, Hao; Ding, Dawei; Gao, Ran; Gao, Xun; Jiang, Xun; Li, Zhisheng; Ni, Xiaotong; Qin, Jin; Song, Zhijun; Sun, Hantao; Tang, Chengchun; Wang, Tenghui; Wu, Feng; Yu, Wenlong; Xia, Tian; Zhang, Gengyan; Zhang, Xiaohang; Zhou, Jingwei; Zhu, Xing; AQL Members, Additional Contributing; Shi, Yaoyun; Chen, Jianxin; Zhao, Hui-Hai; Deng, Chunqing | In this talk, we present our design and experiments of a 2D multi-qubit fluxonium circuit in a scalable, high-fidelity quantum processor. | Session 11: Fluxonium Qubits |

167 | Understanding and mitigating decoherence in fluxonium qubits – Dephasing | Zhang, Gengyan; Sun, Hantao; Deng, Hao; Ding, Dawei; Gao, Ran; Gao, Xun; Ku, Hsiang-Sheng; Jiang, Xun; Li, Zhisheng; Ni, Xiaotong; Qin, Jin; Song, Zhijun; Tang, Chengchun; Wang, Tenghui; Wu, Feng; Yu, Wenlong; Xia, Tian; Zhang, Xiaohang; Zhou, Jingwei; Zhu, Xing; AQL Members, Additional Contributing; Shi, Yaoyun; Chen, Jianxin; Zhao, Hui-Hai; Deng, Chunqing | We present theoretical models and experimental data to study dephasing mechanisms in fluxonium qubits. | Session 11: Fluxonium Qubits |

168 | Machine Learning Approach to Characterization of Multiple Fluxonium Qubits | Chen, Yinqi; Vavilov, Maxim | Here we propose a machine learning approach by training a neural network that takes the measured 0-1 transition energies at several external flux values and predicts parameters E C, E L, and E J for each uxonium qubit. | Session 11: Fluxonium Qubits |

169 | Experimental realization of ultra-high fidelity qubit operations with tunable fluxonium qubits | Wang, Tenghui; Qin, Jin; Deng, Hao; Ding, Dawei; Gao, Ran; Gao, Xun; Ku, Hsiang-Sheng; Jiang, Xun; Li, Zhisheng; Ni, Xiaotong; Song, Zhijun; Sun, Hantao; Tang, Chengchun; Wu, Feng; Yu, Wenlong; Xia, Tian; Zhang, Gengyan; Zhang, Xiaohang; Zhou, Jingwei; Zhu, Xing; AQL Members, Additional Contributing; Shi, Yaoyun; Chen, Jianxin; Zhao, Hui-Hai; Deng, Chunqing | In this talk, we will demonstrate an efficient qubit reset and ultra-high fidelity single and two-qubit gates in a system with two coupled fluxonium qubits. | Session 11: Fluxonium Qubits |

170 | A numerical study of entanglement measures of clusters joined by a point contact | Friedman, Barry; Horne, Alyssa | The improved Monte Carlo method of Sandvik and Evertz is used and the observables include valence bond and loop valence bond observables introduced by Lin and Sandvik as well as the valence bond entropy and the second Renyi entropy. | Session 12: General Quantum Information: Entanglement, Complexity, and Randomness |

171 | Entanglement of formation and quantum discord in multipartite j-spin coherent states. | Baba, Hasnaa; Daoud, Mohammed | We study the entanglement of formation and the quantum discord contained in even and odd multipartite j-spin coherent states. | Session 12: General Quantum Information: Entanglement, Complexity, and Randomness |

172 | Two-dimensional entanglement entropy with chemical potential and topological Wilson loops | Kim, Bom Soo | We provide an organizing tool for various topological phase transitions for the entropies and show that entanglement entropy is non-singular and continuous across the topological sectors. | Session 12: General Quantum Information: Entanglement, Complexity, and Randomness |

173 | Entanglement enhancement in two-dimensional spin system coupled to a thermal dissipative environment in an inhomogeneous magnetic field. | Sadiek, Gehad; Almalky, Samaher | In this work, we study the time evolution and the asymptotic steady state of the bipartite quantum entanglement and spin relaxation in a finite two-dimensional triangular Heisenberg spin -1/2 lattice under the influence of dissipative Lindblad environment at zero and finite temperature. | Session 12: General Quantum Information: Entanglement, Complexity, and Randomness |

174 | Entanglement Between Orbitals | Ding, Lexin; Zimborás, Zoltán; Schilling, Christian | Entanglement Between Orbitals | Session 12: General Quantum Information: Entanglement, Complexity, and Randomness |

175 | Multiregion entanglement in locally scrambled quantum dynamics | Akhtar, Ahmed; You, Yizhuang | We developed a novel theoretical framework, called the entanglement feature formalism, to organize all the multi-region entanglement systematically as a sign-free many-body state. | Session 12: General Quantum Information: Entanglement, Complexity, and Randomness |

176 | Mueasurement-induced randomness in measured qubit processes | Venegas-Li, Ariadna; Crutchfield, James | We discuss measurement choices of potential interest in gaining insight about the underlying time series of qubits. | Session 12: General Quantum Information: Entanglement, Complexity, and Randomness |

177 | Detecting Randomness and Structure in Quantum Processes | Gier, David; Crutchfield, James | In an effort to understand their information content and correlation, we develop a framework for stationary, ergodic quantum processes and define quantum information properties related to the von Neumann entropies of sequential qudit blocks. | Session 12: General Quantum Information: Entanglement, Complexity, and Randomness |

178 | Implementation of general quantum measurements using only a single ancillary qubit and postselection | SINGAL, TANMAY; Maciejewski, Filip; Oszmaniec, Michal | With the aim to reduce resources for near-term quantum computers, we propose a scheme to implement a general quantum measurement (POVM) in dimension d using only classical resources and a single ancillary qubit. | Session 12: General Quantum Information: Entanglement, Complexity, and Randomness |

179 | Observation of interaction induced Rydberg blockade and local spin freezing in an NMR quantum simulator | V R, Krithika; Pal, Soham; Nath, Rejish; T S, Mahesh | Observation of interaction induced Rydberg blockade and local spin freezing in an NMR quantum simulator | Session 12: General Quantum Information: Entanglement, Complexity, and Randomness |

180 | Quantum operator growth bounds for kicked tops and semiclassical spin chains | Yin, Chao; Lucas, Andrew | We prove bounds on infinite temperature out-of-time-ordered correlation functions in semiclassical spin models, where each site contains a large-S spin degree of freedom. | Session 12: General Quantum Information: Entanglement, Complexity, and Randomness |

181 | Model-Independent Simulation Complexity of Complex Quantum Dynamics | Khan, Aiman; Quigley, David; Marcus, Max; Thyrhaug, Erling; Datta, Animesh | We present a model-independent measure of dynamical complexity based on simulation of complex quantum dynamics using stroboscopic Markovian dynamics. | Session 12: General Quantum Information: Entanglement, Complexity, and Randomness |

182 | Quantum Gravity in the Lab | Ghazi Nezami, Sepehr; Brown, Adam; Gharibyan, Hrant; Leichenauer, Stefan; Lin, Henry; Salton, Grant; Susskind, Leonard; Swingle, Brian; Walter, Michael | With the long-term goal of studying quantum gravity in the lab, we propose holographic teleportation protocols that can be readily executed in table-top experiments. | Session 12: General Quantum Information: Entanglement, Complexity, and Randomness |

183 | Geometrical Equivalence Of Entanglement | Mostafanazhad aslmarand, Shahabeddin; Miller, Warner | n this paper, we propose a novel way for coarse-graining entanglement in quantum networks; this unique geometrical approach will enable us to differentiate systems with high quantum correlation from systems with low quantum correlation. | Session 12: General Quantum Information: Entanglement, Complexity, and Randomness |

184 | Robust quantum computational advantage using fermionic linear optics and magic input states | Oszmaniec, Michał | We show that, when initialized with suitable input states, FLO circuits can be used to demonstrate quantum computational advantage. | Session 12: General Quantum Information: Entanglement, Complexity, and Randomness |

185 | The Homotopy Operator and Conservation Laws in Fractional Quantum Mechanics | Been, Joel; Lewis, Joshua; Carr, Lincoln | We applied these methods to describe probability and momentum transport for the space fractional Schrodinger equation which is important in quantum information processing because it describes the non-locality of connected systems. | Session 13: General Quantum Information: Quantum Simulation and Algorithms |

186 | Generation of all-to-all connections in a two-dimensional qubit array with two-body interactions | Tanamoto, Tetsufumi | Herein, we show more concrete sequences to produce four-body and three-body interactions based on a two-dimensional solid-state qubit system. | Session 13: General Quantum Information: Quantum Simulation and Algorithms |

187 | Digital Quantum Simulations of a Non-Stoquastic 2-Qubit Hamiltonian | Pradeep, Namitha; Albash, Tameem | We compare two techniques to simulate the evolution, namely Trotterization and `Continuous qDRIFT’. | Session 13: General Quantum Information: Quantum Simulation and Algorithms |

188 | Quantum Simulation of Hyperbolic Space with Circuit Quantum Electrodynamics: From Graphs to Geometry | Boettcher, Igor; Bienias, Przemyslaw; Belyansky, Ron; Kollar, Alicia; Gorshkov, Alexey | We show how quantum many-body systems on hyperbolic lattices with nearest-neighbor hopping and local interactions can be mapped onto quantum field theories in continuous negatively curved space. | Session 13: General Quantum Information: Quantum Simulation and Algorithms |

189 | Hamiltonian simulation in the low energy subspace | Sahinoglu, Burak; Somma, Rolando | We study the problem of simulating the dynamics of spin systems when the initial state is supported on a subspace of low energy of a Hamiltonian $H$. | Session 13: General Quantum Information: Quantum Simulation and Algorithms |

190 | Analog of a quantum heat engine using a single-spin qubit | Shevchenko, Sergey; Ono, K.; Mori, Takahiro; Moriyama, S.; Nori, Franco | We demonstrated that, while being properly driven, such single-spin qubit experiences cycles analogous to the ones of an Otto heat engine; but now, importantly, displaying quantum superposition. | Session 13: General Quantum Information: Quantum Simulation and Algorithms |

191 | Qubit T Gate Magic State Stabilizer Rank | Kocia, Lucas; Sarovar, Mohan | We show an iterative dependence on reductions of the Gauss sum rank for the T gate magic state. | Session 13: General Quantum Information: Quantum Simulation and Algorithms |

192 | Quantum Phase Estimation with Time-Frequency Qudits in a Single Photon | Lu, Hsuan-Hao; Zixuan, Hu; Alshaykh, Mohammed; Moore, Alexandria; Wang, Yuchen; Imany, Poolad; Weiner, Andrew; Kais, Sabre | In this work, we report an experimental realization of a qudit-based PEA on a photonic platform, utilizing the high dimensionality in time and frequency degrees of freedom (DoFs) in a single photon. | Session 13: General Quantum Information: Quantum Simulation and Algorithms |

193 | A Magnetism-Inspired Quantum Algorithm to Solve the Traveling Salesman Problem | Ellert-Beck, Luke; Lawler, Michael; Gosin, Samuel | The goal of this research is to compare the performance of this quantum circuit with an analogous classical circuit to investigate whether the quantum circuit has an inherent advantage over its classical counterpart in this variational algorithm. | Session 13: General Quantum Information: Quantum Simulation and Algorithms |

194 | A Joint-Detection Receiver for Deep-Space Communications Leveraging Intermediate Measurements on NISQ Hardware. | Delaney, Conor; Seshadreesan, Kaushik; MacCormack, Ian; Galda, Alexey; Guha, Saikat; Narang, Prineha | Here we implement the quantum circuit of a quantum joint detection receiver for a 3-bit binary linear tree code based on the algorithm of belief propagation with quantum messages 1. | Session 13: General Quantum Information: Quantum Simulation and Algorithms |

195 | Quantum statistics in Bohmian trajectory gravity | Andersen, Thomas | It is found that both semi-classical and collapse models predict a lack of entanglement in the experimental results. | Session 13: General Quantum Information: Quantum Simulation and Algorithms |

196 | Custom fermionic codes for quantum simulation | Chien, Riley; Whitfield, James | We present a general construction for designing codes to suit the problem and resources at hand. | Session 13: General Quantum Information: Quantum Simulation and Algorithms |

197 | Simulation of the Fractional Schrödinger Equation in Materials with Sub- and Super-Diffusive Transport | Lewis, Joshua; Been, Joel; Carr, Lincoln | We constructed an algorithm that solves the FSE in space using an integer derivative series approximation to the FD and evolves it in time using Volterra-like integral equations of first kind. | Session 13: General Quantum Information: Quantum Simulation and Algorithms |

198 | Driven dynamics of a quantum dot electron coupled to a spin 3/2 nuclear bath | Vezvaee, Arian; Sharma, Girish; Economou, Sophia; Barnes, Edwin | In this talk, we present a fully quantum, non-perturbative approach that works for any nuclear spin. | Session 13: General Quantum Information: Quantum Simulation and Algorithms |

199 | Quantum algorithm for Petz recovery channels and pretty good measurements | Gilyen, Andras; Lloyd, Seth; Marvian, Iman; Quek, Yihui; Wilde, Mark | This paper sets out to rectify this lack: using the recently developed tools of quantum singular value transformation and oblivious amplitude amplification, we provide a quantum algorithm to implement the Petz recovery channel when given the ability to perform the channel that one wishes to reverse. | Session 13: General Quantum Information: Quantum Simulation and Algorithms |

200 | Gaussian conversion protocols for cubic phase state generation: Part 2 | Zheng, Yu; Hahn, Oliver; Stadler, Pascal; Holmvall, Patric; Quijandria Diaz, Isaac; Ferraro, Alessandro; Ferrini, Giulia | In this talk, we introduce a probabilistic Gaussian conversion protocol that allows one to prepare a cubic phase state by starting from a trisqueezed state that has been realized experimentally with microwave circuits [Sandbo Chang et al., Phys.Rev. | Session 14: Generating and Characterizing Continuous Variable Quantum Resources |

201 | Robustness of deformed catlike states under dissipative decoherence | Belfakir, Abdessamad | Varying the deformation parameters, we have obtained catlike states having more resistance against decoherence than catlike states of the ordinary harmonic oscillator. | Session 14: Generating and Characterizing Continuous Variable Quantum Resources |

202 | Wigner negativity in the steady-state output of a Kerr parametric oscillator | Strandberg, Ingrid; Johansson, Göran; Quijandria Diaz, Isaac | In this work, we study the Wigner negativity of the steady-state output field from a parametrically driven Kerr oscillator, where the output states are defined in terms of wave packet modes. | Session 14: Generating and Characterizing Continuous Variable Quantum Resources |

203 | Robust engineering of universal Gaussian cluster states in harmonic lattices with a single-site squeezed reservoir | Vitali, David; Zippilli, Stefano | We provide the explicit protocol which corresponds to the engineering of a suitable excitation number conserving Hamiltonian.This fact can be used for the implementation of universal continuous variable measurement-based-quantum computation on various platforms. | Session 14: Generating and Characterizing Continuous Variable Quantum Resources |

204 | Constraints on Gaussian error channels for entanglement swapping with Gaussian measurements | Kwiatkowski, Alex; Shojaee, Ezad; Agrawal, Sristy; Glancy, Scott; Knill, Emanuel | We describe a formalism for Gaussian measurements of continuous-variable quantum systems and use it to derive constraints on entanglement swapping. | Session 14: Generating and Characterizing Continuous Variable Quantum Resources |

205 | Non-Gaussian quantum states of a multimode light field | Treps, Nicolas | We explore the interplay between non-Gaussianity and quantum entanglement and demonstrate large-scale non-Gaussianity with great flexibility along with an ensured compatibility with quantum information protocols. | Session 14: Generating and Characterizing Continuous Variable Quantum Resources |

206 | Generation of Gottesman-Kitaev-Preskill codes in a periodically driven quantum system | Bomantara, Raditya; Grimsmo, Arne | In this talk we present a relatively simple periodically driven quantum system whose Floquet eigenstates are approximate Gottesman-Kitaev-Preskill codewords. | Session 14: Generating and Characterizing Continuous Variable Quantum Resources |

207 | Efficient simulatability of continuous-variable circuits with large Wigner negativity | García-Álvarez, Laura; Calcluth, Cameron; Ferraro, Alessandro; Ferrini, Giulia | In this work, we identify vast families of circuits that display large Wigner negativity, and yet are classically efficiently simulatable, although they are not recognized as such by previously available theorems. | Session 14: Generating and Characterizing Continuous Variable Quantum Resources |

208 | Optimal tests for continuous-variable quantum teleportation and photodetectors | Sharma, Kunal; Sanders, Barry; Wilde, Mark | In this work, we propose an optimal test for the performance of continuous-variable (CV) quantum teleportation in terms of the energy-constrained channel fidelity between ideal CV teleportation and its experimental implementation. | Session 14: Generating and Characterizing Continuous Variable Quantum Resources |

209 | Gaussian conversion protocols for cubic phase state generation: Part 1 | Hahn, Oliver; Zheng, Yu; Stadler, Pascal; Holmvall, Patric; Quijandria Diaz, Isaac; Ferraro, Alessandro; Ferrini, Giulia | We introduce a deterministic Gaussian conversion protocol that allows for the conversion of a non-Gaussian state that has been achieved experimentally, namely the trisqueezed state [Sandbo Chang et al, Phys. | Session 14: Generating and Characterizing Continuous Variable Quantum Resources |

210 | Propagating Wigner-negative states from the steady-state emission of a superconducting qubit | Lu, Yong; Strandberg, Ingrid; Quijandria Diaz, Isaac; Johansson, Göran; Gasparinetti, Simone; Delsing, Per | Here, by contrast, we demonstrate the steady-state generation of propagating Wigner-negative states at steady state, from a continuously driven superconducting qubit. | Session 14: Generating and Characterizing Continuous Variable Quantum Resources |

211 | Efficient verification of continuous-variable quantum states and quantum devices beyond independent and identical assumption | Wu, Yadong; Ge, Bai; Chiribella, Giulio; Liu, Nana | In this paper, we propose the first reliable schemes to verify multimode continuous-variable entangled states and devices in these non-i.i.d scenarios. | Session 14: Generating and Characterizing Continuous Variable Quantum Resources |

212 | Complex two-mode quadratures – a generalized formalism for continuous-variable quantum optics | Bello, Leon; Michael, Yoad; Rosenbluh, Michael; Cohen, Eliahu; Pe’er, Avi | We introduce a generalized set of complex quadrature operators that treats degenerate and non-degenerate squeezing on the same footing. | Session 14: Generating and Characterizing Continuous Variable Quantum Resources |

213 | Quantum Orchestration – Integrated hardware and software for design and execution of complex quantum control protocols, Part 1 | Sivan, Itamar; Cohen, Yonatan; Ofek, Nissim; Shani, Tal; Weber, Ori; Ella, Lior; Drucker, Niv; Greenbaum, Michael; Halay, Nir | Here we present a new platform for designing quantum control protocols, executing them on a wide range of quantum hardware, and optimizing performance. | Session 15: Hardware, Software and Techniques for Optimal Quantum Control |

214 | Quantum Orchestration – Integrated hardware and software for design and execution of complex quantum control protocols, Part 2 | Cohen, Yonatan; Sivan, Itamar; Ofek, Nissim; Ella, Lior; Drucker, Niv; Weber, Ori; Shani, Tal; Greenbaum, Michael; Halay, Nir | Here we present a new platform for designing quantum control protocols, executing them on a wide range of quantum hardware, and optimizing performance. | Session 15: Hardware, Software and Techniques for Optimal Quantum Control |

215 | qopt: A Python Software Package for Quantum Simulation and Optimal Control | Teske, Julian David; Cerfontaine, Pascal; Butt, Friederike; Bluhm, Hendrik | We introduce qopt, a software framework for robust quantum optimal control considering realistic experimental conditions. | Session 15: Hardware, Software and Techniques for Optimal Quantum Control |

216 | Efficient reverse engineering of robust one-qubit control pulses for broadband noise | Colmenar, Ralph Kenneth; Kestner, Jason | We derive an analytical expression for the filter-transfer function of an arbitrary one-qubit gate through the use of dynamical invariant theory and Hamiltonian reverse engineering. | Session 15: Hardware, Software and Techniques for Optimal Quantum Control |

217 | FPGA-based optimal control for two-qubit gates | Sussman, Sara; Mundada, Pranav; Place, Alexander; Premkumar, Anjali; Houck, Andrew | Here we present the results of these new controls applied in an optimal control scheme for a two-qubit gate. | Session 15: Hardware, Software and Techniques for Optimal Quantum Control |

218 | Control of superconducting qubits using a quantum-based Josephson Arbitrary Waveform Synthesizer | Howe, Logan; Sirois, Adam; Castellanos-Beltran, Manuel; Fox, Anna; Dresselhaus, Paul; Benz, Samuel; Hopkins, Peter | Integration of control/readout electronics at cryogenic temperatures offers an attractive solution to these challenges and benefits from reduced latency feedback via proximity with the quantum hardware. | Session 15: Hardware, Software and Techniques for Optimal Quantum Control |

219 | Clock Synchronization and Data Exchange between FPGA Modules for Superconducting Qubit Control | Huang, Gang; Xu, Yilun; Stezelberger, Thorsten; Santiago, David; Siddiqi, Irfan | We propose and develop a fiber-based clock synchronization and data exchange protocol for inter-module communication using our in-house developed FPGA based RF control system – QubiC. | Session 15: Hardware, Software and Techniques for Optimal Quantum Control |

220 | Automatic Two-qubit Gate Calibration with QubiC | Xu, Yilun; Huang, Gang; Naik, Ravi; Morvan, Alexis; Nowrouzi, Kasra; Mitchell, Brad; Santiago, David; Siddiqi, Irfan | We developed an efficient and systematic method to automatically tune up a CNOT gate with QubiC – a customized FPGA-based Qubit Control system at LBNL. | Session 15: Hardware, Software and Techniques for Optimal Quantum Control |

221 | A low-noise, flexible and scalable control paradigm for quantum computing in the NISQ era | van Oven, Jules C.; Gloudemans, Jordy; Vlothuizen, Wouter; Woudstra, Martin; Tiggelman, Marijn; Attryde, Callum; Negirneac, Victor; Crielaard, Damien; Hantute, Maxime; Bultink, Cornelis Christiaan | In the race towards quantum computers with real-life applications, major challenges have to be overcome: improving the quality of qubits and operations, scaling up the number of qubits, and harnessing algorithms with error mitigation and correction strategies. | Session 15: Hardware, Software and Techniques for Optimal Quantum Control |

222 | Characterization of the Cross Resonance Effect for Superconducting Transmon Qutrits | Brzeczek, Merrell; Morvan, Alexis; Naik, Ravi; Mitchell, Brad; Santiago, David; Siddiqi, Irfan | In this work, we experimentally characterize the cross resonance effect between two fixed frequency transmons from a qutrit perspective. | Session 15: Hardware, Software and Techniques for Optimal Quantum Control |

223 | Arbitrary controlled-phase gate on fluxonium qubits | Xiong, Haonan; Ficheux, Quentin; Nesterov, Konstantin; Nguyen, Long; Somoroff, Aaron; Wang, Chen; Vavilov, Maxim; Manucharyan, Vladimir | In this work, we demonstrate the implementation of a continuous set of microwave-activated arbitrary controlled-phase (CPhase) gates on two fluxonium qubits, a promising candidate for quantum computation. | Session 15: Hardware, Software and Techniques for Optimal Quantum Control |

224 | Robust quantum gates for qubit clusters with fixed coupling | Le, Nguyen; Cykiert, Max; Ginossar, Eran | We design robustness optimal control for implementing a universal set of quantum gates in a finite-size cluster of up to 10 interacting qubits. | Session 15: Hardware, Software and Techniques for Optimal Quantum Control |

225 | Control, Calibration and Characterization of a simulated two-transmon chip. Part 1 | Roy, Federico; Wittler, Nicolas; Pack, Kevin; Werninghaus, Max; Roy, Anurag Saha; Egger, Daniel; Filipp, Stefan; Wilhelm, Frank; Machnes, Shai | We demonstrate a new integrated open-source tool-set for Control, Calibration and Characterization (C 3) [1] by applying it to a simulated example of a two-qubit quantum processor. | Session 15: Hardware, Software and Techniques for Optimal Quantum Control |

226 | Control, Calibration and Characterization of a simulated two-transmon chip. Part 2 | Wittler, Nicolas; Roy, Federico; Pack, Kevin; Werninghaus, Max; Roy, Anurag Saha; Egger, Daniel; Filipp, Stefan; Wilhelm, Frank; Machnes, Shai | As an application example, we present the characterization of a two-qubit QPU in simulation. | Session 15: Hardware, Software and Techniques for Optimal Quantum Control |

227 | Fast, noise-robust pulses for parametric entangling gates in superconducting qubits | Bentley, Christopher; Carvalho, Andre; Biercuk, Michael; Hush, Michael; Hill, Alexander; Didier, Nicolas; Jones, Glenn | We demonstrate that, even when starting from a set of parameters outside the sweet-spot condition, the introduction of numerically optimized flux-modulation waveforms can restore gate robustness. | Session 15: Hardware, Software and Techniques for Optimal Quantum Control |

228 | In-situ entanglement generation based on rare-earth quantum memory coupled to a nonlinear cavity (Part II: theoretical analysis) | Lau, Hoi-Kwan; Qiao, Hong; Clerk, Aashish; Zhong, Tian | In this work, we study a novel architecture where a rare-earth-based spin memory directly couples to an entanglement-generating cavity photon source. | Session 16: Hybrid Quantum Photonic Systems |

229 | In-situ entanglement generation based on rare-earth quantum memory coupled to a nonlinear cavity (Part I: experimental proposal) | Qiao, Hong; Lau, Hoi-Kwan; Clerk, Aashish; Zhong, Tian | In this first talk of the series, we discuss an experiment that consists of an erbium-based solid-state quantum memory coupled to a χ (3) nonlinear resonator. | Session 16: Hybrid Quantum Photonic Systems |

230 | Twenty millisecond electron-spin coherence in an erbium doped crystal | Le Dantec, Marianne; Rancic, Milos; Flurin, Emmanuel; Vion, Denis; Esteve, Daniel; Bertet, Patrice; Goldner, Philippe; Chanelière, Thierry; Sylvain, Bertaina; Lin, Sen; Liu, Ren Bao | Here we present our recent EPR results in 50 ppm and 10 ppb Er doped CaWO4. | Session 16: Hybrid Quantum Photonic Systems |

231 | High-rate classical and quantum communication using modulated mode locked laser source with low jitter SNSPDs | Mueller, Andrew; Korzh, Boris; Valivarthi, Raju; Spiropulu, Maria | By pumping a pair generation crystal with the modulated laser we aim to demonstrate entanglement distribution with repetition rates beyond 5 GHz. | Session 16: Hybrid Quantum Photonic Systems |

232 | Scalable quantum systems combining spins in semiconductors, optimized photonics, and Floquet engineering | Vuckovic, Jelena | To overcome inhomogeneities in semiconductor qubits and in their connections, we have been relying on fast photonics inverse design approach that we have developed and on optimization (Floquet engineering) of the qubits themselves. | Session 16: Hybrid Quantum Photonic Systems |

233 | Entanglement generation between distant nuclear ensembles in quantum dots | Bello, Miguel; Benito, Monica; Giedke, Geza; Platero, Gloria | We propose a protocol for the deterministic generation of entanglement between two ensembles of nuclei surrounding two distant quantum dots which are connected via an electronic bus. | Session 16: Hybrid Quantum Photonic Systems |

234 | Optical and spin characterization of erbium-doped yttrium orthovanadate crystal for microwave to optical conversion | Xie, Tian; Rochman, Jake; Bartholomew, John; Ruskuc, Andrei; Kindem, Jonathan; Craiciu, Ioana; Faraon, Andrei | Using high-resolution spectroscopy and electron paramagnetic resonance methods, we report the optical and spin properties of the erbium-doped yttrium orthovanadate crystal. | Session 16: Hybrid Quantum Photonic Systems |

235 | Cavity electro-optics in thin-film lithium niobate for microwave-to-optical transduction | Holzgrafe, Jeffrey; Sinclair, Neil; Zhu, Di; Shams-Ansari, Amirhassan; Colangelo, Marco; Hu, Yaowen; Zhang, Mian; Berggren, Karl; Loncar, Marko | Here we present a cavity electro-optic transducer in a thin-film lithium niobate platform, which provides strong nonlinearity and low optical loss. | Session 16: Hybrid Quantum Photonic Systems |

236 | Spin coherence measurement of the singlet-triplet system in a self-assembled quantum dot molecule | Tran, Kha; Bracker, Allan; Yakes, Michael; Grim, Joel; Gammon, Daniel; Carter, Samuel | We examine the spin coherence of a system of two QDs separated by a 9 nm tunnel barrier, with an exchange splitting of about 12 GHz. | Session 16: Hybrid Quantum Photonic Systems |

237 | Multi-emitter cavity QED with color centers | Norman, Victoria; Patton, Jesse; Scalettar, Richard; Radulaski, Marina | To circumvent both these obstacles, we explore systems of multiple color centers coupled to cavity arrays. | Session 16: Hybrid Quantum Photonic Systems |

238 | Entanglement in optical circuits based on Mie resonant metastructures integrated with on-chip array of single photon sources | Chattaraj, Swarnabha; Zhang, Jiefei; Lu, Siyuan; Madhukar, Anupam | In this talk we will present: (a) FEM-based simulations of DBB metastructure enabled coupling between distinct SPSs over long range mediated by photons in Mie states resulting in super-radiance; (b) Von-Neumann – Lindblad approach based analysis that shows the emergence of coherence between distant SPSs resulting in entanglement- a critical need towards QIP. | Session 16: Hybrid Quantum Photonic Systems |

239 | Inverse design of immersion metasurfaces for optimal photon collection from solid-state qubits | Klein, Amelia; Engheta, Nader; Bassett, Lee | Here, we employ inverse design techniques to design fabricable structures that optimize the total photon collection from an NV center in bulk diamond into a desired field profile. | Session 16: Hybrid Quantum Photonic Systems |

240 | Planarized Ordered Uniform Mesa-top Single Quantum Dot Single Photon Source Arrays: A Platform for Scalable Quantum Optical Networks | Zhang, Jiefei; Huang, Qi; Jordao, Lucas; Chattaraj, Swarnabha; Lu, Siyuan; Madhukar, Anupam | To this end, we have demonstrated such SPSs based on a new class of spatially ordered and spectrally uniform InGaAs/GaAs single quantum dots (SQDs) that reside on nanomesa tops [1,2]. | Session 16: Hybrid Quantum Photonic Systems |

241 | Toward a Graphene-based Quantum Simulator | Weinberg, Phillip; Feiguin, Adrian | We propose an architecture that allows for the systematic control of the effective exchange interactions between magnetic impurities embedded in nano-scale graphene flakes connected by a gated bridge. | Session 17: Hybrid Quantum Systems |

242 | Improving cooling performance in an optomechanical system using a non-linear cavity | Zoepfl, David; Juan, Mathieu L.; Schneider, Christian M. F.; Kirchmair, Gerhard | Despite being in the bad cavity limit, we show a possible way to overcome this limitation by using a non-linear cavity. | Session 17: Hybrid Quantum Systems |

243 | Simulating quantum dynamical phenomena using classical oscillators | Ivakhnenko, Oleh; Shevchenko, Sergey; Nori, Franco | Simulating quantum dynamical phenomena using classical oscillators | Session 17: Hybrid Quantum Systems |

244 | Many-body dynamics for the Dicke model based on the quantum measurement | Choi, Yunjin; Tsai, Shan-Wen | Treating the spin subsystem as the main system of interest, we consider the bosonic degrees of freedom as an environment that can be controlled and probed to some extent. | Session 17: Hybrid Quantum Systems |

245 | Towards Quantum Optomechanics Using Bulk Acoustic Wave Resonators | Doeleman, Hugo; Schatteburg, Tom; Drimmer, Maxwell; Chu, Yiwen | We present our advances in developing a cryogenic cavity optomechanical device based on a bulk-acoustic-wave (BAW) mechanical resonator, which can act as an essential part of a MW-to-optical transducer. | Session 17: Hybrid Quantum Systems |

246 | Switchable bipartite and genuine tripartite entanglement via an optoelectromechanical interface | Jiang, Cheng; Tserkis, Spyros; Collins, Kevin; Onoe, Sho; Li, Yong; Tian, Lin | Here we present a scheme that generates switchable bipartite and genuine tripartite entanglement between microwave and optical photons via an optoelectromechanical interface, where microwave and optical cavities are coupled to a mechanical mode with controllable coupling constants. | Session 17: Hybrid Quantum Systems |

247 | Controlling the charge dispersion of a nearly-open superconducting island | Bargerbos, Arno; Uilhoorn, Willemijn; Pita Vidal, Marta; Yang, Chung-Kai; Krogstrup, Peter; Kouwenhoven, Leo; De Lange, Gijs; Van Heck, Bernard; Kou, Angela | We investigate the charge dispersion of a nanowire transmon hosting an accidental resonant level in the junction. | Session 17: Hybrid Quantum Systems |

248 | A reproducible design for multi-mode high-Q superconducting quantum electromechanics | Youssefi, Amir; Vovk, Tatiana; Bancora, Andrea; Kippenberg, Tobias | Here we introduce a reproducible design using a novel nanofabrication process to make a flat high-stress aluminum trampoline resonator. | Session 17: Hybrid Quantum Systems |

249 | Dissipation-induced antiferromagnetic-like frustration in coupled photonic resonators | Li, Zejian; Soret, Ariane; Ciuti, Cristiano | We show theoretically how to create dissipatively antiferromagnetic-like frustration between coupled photonic resonators with quantum nonlinearities [1]. | Session 17: Hybrid Quantum Systems |

250 | Entanglement dynamics in dissipative photonic Mott insulators | Donatella, Kaelan; Biella, Alberto; Le Boité, Alexandre; Ciuti, Cristiano | We present a theoretical investigation of the entanglement dynamics in photonic Mott insulators in the presence of particle losses and dephasing [1], a class of quantum systems that has been recently demonstrated using superconducting quantum circuits [2]. | Session 17: Hybrid Quantum Systems |

251 | Repeated pumping of quantum systems | Banerjee, Saikat; Ziegler, Klaus | For this purpose, we introduce a statistical approach to characterize the discrete-time statistics, which is determined by the contact between the two closed systems. | Session 17: Hybrid Quantum Systems |

252 | Long-lived Macroscopic Schrödinger Cat States in Atomic Ensembles | Qin, Wei; Miranowicz, Adam; Jing, Hui; Nori, Franco | [1], we proposed a method to obtain large-size and long-lived Schrödinger cat states in atomic ensembles. | Session 17: Hybrid Quantum Systems |

253 | Optimal Strategies for Sending Atoms Around the Bend | Kurkcuoglu, Doga; Timmermans, Eddy; Boshier, Malcolm | In this presentation, I will discuss classical and quantum-based optimization schemes to minimize the transverse excitations of a guided cold atom matter wave after that wave has completed a bend, changing direction by a fixed bending angle $\theta_0$ over a pre-determined distance. | Session 17: Hybrid Quantum Systems |

254 | Certification of high-dimensional entanglement in ultracold atom systems | Euler, Niklas | One such method has been introduced recently and demonstrated with entangled photon pairs [J. Bavaresco, Nature Physics 2018], allowing one to extract the entanglement dimension, a measure for bipartite entanglement. | Session 17: Hybrid Quantum Systems |

255 | Impact of the Central Frequency of Environment on Non-Markovian Dynamics in PiezoelectricOptomechanical Devices | Chen, Yusui | In this paper, a semi-classical and full-quantum model of piezoelectric optomechanical systems coupled to a noisy bosonic quantum environment is introduced and solved in terms of quantum-state diffusion (QSD) trajectories in the non-Markovianregime. | Session 17: Hybrid Quantum Systems |

256 | Membrane-based scanning force microscopy | Hälg, David; Gisler, Thomas; Tsaturyan, Yeghishe; Letizia, Catalini; Grob, Urs; Krass, Marc-Dominik; Héritier, Martin; Mattiat, Hinrich; Thamm, Ann-Katrin; Schirhagl, Romana; Langman, Eric Christopher; Schliesser, Albert; Degen, Christian; Eichler, Alexander | We present first topography images of samples placed on the membrane surface. | Session 17: Hybrid Quantum Systems |

257 | Optomechanical coupling enhanced by quantum reactance in Josephson junction devices | Haque, Mohammad Tasnimul; Will, Marco; Manninen, Juuso; Vitali, David; Hakonen, Pertti | Optomechanical coupling enhanced by quantum reactance in Josephson junction devices | Session 17: Hybrid Quantum Systems |

258 | Permanent Directional Heat Currents in Lattices of Optomechanical Resonators | Denis, Zakari; Biella, Alberto; Favero, Ivan; Ciuti, Cristiano | We present a general procedure to obtain the effective Lindblad dynamics of the phononic modes for an arbitrary lattice geometry, where the light modes play the role of an effective reservoir that mediates the phonon nonequilibrium dynamics. | Session 17: Hybrid Quantum Systems |

259 | Quantum-limited mechanical force sensor based on cavity optomechanics | Roos, August; Scarano, Ermes; Holmgren, Erik; Baglioni, Gabriele; Soro Alvarez, Ariadna; Haviland, David | We investigate two separate designs based on capacitive and inductive modulation of a superconductive lumped-element microwave resonance, which couples the mechanical and microwave modes. | Session 17: Hybrid Quantum Systems |

260 | Quantum transducer with a color center in a 2D nanomechanical resonator | Gao, Xingyu; Yin, Zhang-Qi; Li, Tongcang | Here we demonstrate that a 2D resonator integrated by hBN membranes containing single photon emitters can achieve strong coupling regime between the vibrational mode and the electron state. | Session 17: Hybrid Quantum Systems |

261 | Searching for scalar dark matter with mechanical sensors | Manley, Jack; Stump, Russell; Singh, Swati | Our work proposes several small-scale experiments to contribute to the search for dark matter. | Session 17: Hybrid Quantum Systems |

262 | Searching for vector dark matter with an optomechanical accelerometer | Dey Chowdhury, Mitul; Manley, Jack; Grin, Daniel; Singh, Swati; Wilson, Dalziel | We consider searching for this signal with optomechanical accelerometers, a technology being pursued in a diversity of platforms ranging from levitated microspheres to whispering gallery mode resonators. | Session 17: Hybrid Quantum Systems |

263 | Sideband cooling of an encapsulated micromechanical resonator using an integrated microwave cavity | Bousse, Nicholas; Miller, James; Vukasin, Gabrielle; Kwon, Hyun-Keun; Kenny, Thomas | In this work, we use parametric coupling of an encapsulated micro-scale resonator to an integrated microwave cavity to demonstrate both sideband heating and cooling of the mechanical mode at room temperature. | Session 17: Hybrid Quantum Systems |

264 | Stimulated Raman adiabatic passage in Optomechanics | Fedoseev, Vitaly; Luna, Jose; Löffler, Wolfgang; Bouwmeester, Dirk | The maximum state transfer efficiency of a coherent excitation we achieve is 85% which is in good agreement with a theoretical model. | Session 17: Hybrid Quantum Systems |

265 | Two-membrane cavity optomechanics | Piergentili, Paolo; Li, Wenlin; Malossi, Nicola; Natali, Riccardo; Vitali, David; Di Giuseppe, Giovanni | We find that the optomechanical coupling strength is enhanced by constructive interference when the two membranes are positioned to form an inner cavity which is resonant with the driving field. | Session 17: Hybrid Quantum Systems |

266 | Towards Stationary Optomechanical Entanglement of a Levitated Nanosphere Inside an Optical Cavity | Dare, Kahan; Reisenbauer, Manuel; Gut, Corentin; Winkler, Klemens; Coroli, Yuriy; Johnson, Aisling; Delic, Uros; Aspelmeyer, Markus | In this talk, I will present our recent work towards demonstrating such entanglement using a silica nanoparticle inside of an optical cavity. | Session 17: Hybrid Quantum Systems |

267 | Virtual and real dynamical Casimr effects in optomechanical systems | Di Stefano, Omar; Macrì, Vincenzo; Savasta, Salvatore; Nori, Franco | Here we summarize recent theoretical studies on the dynamical Casimir effects (DCEs) in optomechanical systems. | Session 17: Hybrid Quantum Systems |

268 | Optical and electrical feedback cooling of a silica nanoparticle levitated in a Paul trap | Dania, Lorenzo; Bykov, Dmitry; Mestres, Pau; Knoll, Matthias; Heidegger, Katharina; Cerchiari, Giovanni; Northup, Tracy | Here we will show how we apply a cold damping technique to cool all three motional modes of a silica nanoparticle levitated in a Paul trap down to temperatures of a few mK. | Session 17: Hybrid Quantum Systems |

269 | Millimeter Wave Quantum Optomechanics | Hauer, Bradley; Cicak, Katarina; Lecocq, Florent; Simmonds, Raymond; Aumentado, Jose; Teufel, John | Here, I will present theory, design and preliminary experiments detailing our approach to address these issues by introducing a new regime of optomechanics whereby mechanical oscillators are coupled to millimeter wave (~30 GHz) photons. | Session 17: Hybrid Quantum Systems |

270 | Novel Optomechanical Coupling Mechanisms in nanostructured Metasurfaces | Bruns, Florian; Rojas, Carol; Malureanu, Radu; Siefke, Thomas; Kroker, Stefanie | In this work we investigate bilayer metasurfaces as a platform for dispersive and dissipative coupling in the frame of cavity optomechanics. | Session 17: Hybrid Quantum Systems |

271 | Studies of NbN high-impedance superconducting microwave resonators under optical illumination for quantum transduction applications | Wood, Steven; Meesala, Srujan; Sipahigil, Alp; Lake, David; Chiappina, Piero; Banker, Jash; Beyer, Andrew; Shaw, Matthew; Painter, Oskar | Motivated by this challenge, we have developed high-Q (105 at single-photon-level), tunable, GHz-frequency niobium nitride (NbN) resonators on silicon-on-insulator for integration into a piezo-acoustic transducer. | Session 18: Hybrid Quantum Systems I – Phononics and Magnonics |

272 | Circuit quantum acousto-dynamics with bulk acoustic wave resonators | Bild, Marius; von Luepke, Uwe; Yang, Yu; Drimmer, Maxwel; Doeleman, Hugo; Chu, Yiwen | As steps toward realizing these possibilities, we present our work on improving the performanceof HBAR-based circuit quantum acousto-dynamics devices. | Session 18: Hybrid Quantum Systems I – Phononics and Magnonics |

273 | Towards a Mechanical Qubit in a Carbon Nanotube | Moller, Christoffer; Tormo Queralt, Roger; De Bonis, Sergio; Samanta, Chandan; Czaplewski, David; Cleland, Andrew; Pistolesi, Fabio; Bachtold, Adrian | We present our efforts towards realizing the first ever mechanical qubit [1]. | Session 18: Hybrid Quantum Systems I – Phononics and Magnonics |

274 | Pulsed Cavity Electro-optics for Ground-state Microwave-to-optical Conversion | Xu, Mingrui; Fu, Wei; Liu, Xianwen; zou, Chang-ling; Zhong, Changchun; Han, Xu; Shen, Mohan; Xu, Yuntao; Cheng, Risheng; Wang, Sihao; Jiang, Liang; Tang, Hong | Here we present an experimental study of the microwave noise in an electro-optic transducer under intense optical drives. | Session 18: Hybrid Quantum Systems I – Phononics and Magnonics |

275 | Coherent, focusing surface acoustic wave resonators for multimode quantum acoustodynamics | Sletten, Lucas; Rose, Brendon; Emser, Alec; Aramburu Sanchez, Pablo; Lehnert, Konrad | Here, we demonstrate highly coherent (Q >3×10 5) SAW resonators on quartz with narrow apertures (aperture < 5λ) by using curved reflectors to form stable cavities, a design task complicated by the anisotropy of sound on quartz. | Session 18: Hybrid Quantum Systems I – Phononics and Magnonics |

276 | Quantum measurements of a thin-film bulk acoustic resonator using a superconducting qubit | Chou, Ming-Han; Dumur, Etienne; Zhong, Youpeng; Peairs, Gregory; Bienfait, Audrey; Chang, Hung-Shen; Conner, Christopher; Grebel, Joel; Povey, Rhys; Satzinger, Kevin; Cleland, Andrew | In this talk, we will describe a piezoelectric thin-film bulk acoustic resonator with a 4.88 GHz resonant frequency that at cryogenic temperatures displays large electromechanical coupling strength combined with a high intrinsic mechanical quality factor. | Session 18: Hybrid Quantum Systems I – Phononics and Magnonics |

277 | Photon condensation in magnetic cavity QED | Zueco, David | We show that a system of magnetic molecules coupled to microwave cavities (or LC resonators) undergoes the equilibrium superradiant transition when their mutual interaction exceeds a critical value and that this transition is experimentally observable. | Session 18: Hybrid Quantum Systems I – Phononics and Magnonics |

278 | Enhanced magnon lifetimes in out-of-equilibrium quantum magnonics | Wolski, Samuel; Lachance-Quirion, Dany; Van Loo, Arjan; Nakamura, Yasunobu | We demonstrate that the lifetime of magnons in the magnetostatic mode of a ferrimagnetic sphere can be enhanced in-situ by around 30% by strongly pumping at an appropriate frequency, suggestive of the saturation of a bath of two-level systems (TLSs) [1]. | Session 18: Hybrid Quantum Systems I – Phononics and Magnonics |

279 | Electric field control of interaction between magnons and quantum spin defects | Solanki, Abhishek; Bogdanov, Simeon; Rustagi, Avinash; Dilley, Neil; Shen, Tingting; Rahman, Mohammad Mushfiqur; Tong, Wenqi; Debashis, Punyashloka; Chen, Zhihong; Appenzeller, Joerg; Chen, Yong; Shalaev, Vladimir; Upadhyaya, Pramey | Here, we leverage the electric polarization control of magnetic anisotropy in ferromagnet-ferroelectric multiferroics to modulate the interaction between magnons and nitrogen vacancy (NV) center spins in a nanodiamond, changing the NV spin relaxation time by 400%. | Session 18: Hybrid Quantum Systems I – Phononics and Magnonics |

280 | A gate-tunable, field-compatible fluxonium | Pita-Vidal, Marta; Bargerbos, Arno; Vakhtel, Tereza; Yang, Chung-Kai; Van Woerkom, David; Pfaff, Wolfgang; Haider, Nadia; Krogstrup, Peter; Kouwenhoven, Leo; De Lange, Gijs; Van Heck, Bernard; Kou, Angela | We use our nanowire fluxonium as a sensitive probe to study phase slips in highly transparent Josephson junctions. | Session 18: Hybrid Quantum Systems I – Phononics and Magnonics |

281 | Strong magnon-photon coupling on-chip for YIG in the zero-temperature limit | Baity, Paul; Bozhko, Dmytro; Macedo, Rair; Smith, William; Holland, Rory; Danilin, Sergey; Seferai, Valentino; Paul, Jharna; Peroor, Renju; Nasti, Umberto; McVitie, Stephen; Casaburi, Alessandro; Hadfield, Robert; Weides, Martin | To overcome this impediment, we have used Plasma Focused Ion Beam (PFIB) technology to integrate YIG on-chip with superconducting microwave devices, taking advantage of precision placement down to the micron-scale. | Session 18: Hybrid Quantum Systems I – Phononics and Magnonics |

282 | Ab initio calculations of exciton-phonon coupling in color centers | Simoni, Jacopo; Tan, Liang | One of the most important sources of decoherence in solid state qubits is the scattering of excitonic states with phonons, here we will explain how we can compute exciton lifetimes in systems like transition metal dichalcogenides (TMD), NV center in diamond and other materials of interest for quantum information applications. | Session 18: Hybrid Quantum Systems I – Phononics and Magnonics |

283 | Integrating superconducting circuits with phononic bandgap structures for quantum networking and memory | Kindel, William; Harris, Charles; Skinner Ramos, Sueli D; DiGregorio, Sara; Miller, Michael; Taylor, Jeffrey; Hackett, Lisa; Lewis, Rupert; Eichenfield, Matthew | Here, we present our progress developing superconducting circuits for integration with phononic bandgap crystals. | Session 18: Hybrid Quantum Systems I – Phononics and Magnonics |

284 | Magnon-mediated entanglement of spin qubits via on- and off-resonant interactions | Fukami, Masaya; Candido, Denis; Awschalom, David; Flatté, Michael | This work serves as a guide for future experiments that aim to entangle spin qubits in solids through magnon excitations. | Session 18: Hybrid Quantum Systems I – Phononics and Magnonics |

285 | Linear quantum-confined Stark effect and field tunable excitonic oscillator strength in bilayer WS2 | Das, Sarthak; Dandu, Medha; Gupta, Garima; Murali, Krishna; Abraham, Nithin; Taniguchi, Takashi; Watanabe, Kenji; Kallatt, Sangeeth; Majumdar, Kausik | Linear quantum-confined Stark effect and field tunable excitonic oscillator strength in bilayer WS2 | Session 19: Hybrid Quantum Systems II – Optomechanics |

286 | Ultrasensitive torque detection and 5D cooling of optically levitated nanoparticles | Ju, Peng; Ahn, Jonghoon; Bang, Jaehoon; Xu, Zhujing; Gao, Xingyu; Li, Tongcang | Here, we demonstrate the state-of-art torque sensor reaching sensitivity of (4.2 ± 1.2) ×10 -27 N m Hz -1/2 at room temperature with an optically levitated nanorotor in vacuum [1]. | Session 19: Hybrid Quantum Systems II – Optomechanics |

287 | Low temperature diamond optomechanics | Cady, Jeff; Patel, Rishi; Safavi-Naeini, Amir; Jayich, Ania | As a step toward this goal, we design and fabricate single-crystal diamond optomechanical crystals which host GHz-scale mechanical modes with large zero-point strain and characterize their optomechanical properties at 6K in a closed-cycle cryostat. | Session 19: Hybrid Quantum Systems II – Optomechanics |

288 | Quantum fluctuation induced heat transfer between nano-mechanical membranes | Fong, King Yan; Li, Haokun; Zhao, Rongkuo; Yang, Sui; Wang, Yuan; Zhang, Xiang | Here we report the first experimental observation of such a phenomenon [1]. | Session 19: Hybrid Quantum Systems II – Optomechanics |

289 | Effects of Phase Noise in Microwave Control Sequences on Spin Coherence | Huang, Tzu-Yung; Hopper, David; Idjadi, Mohamad; Omirzakhov, Kaisarbek; Breitweiser, Stanley; Aflatouni, Firooz; Bassett, Lee | We present experimental results on how the observed T2* of a single NV center varies as a function of phase noise levels. | Session 19: Hybrid Quantum Systems II – Optomechanics |

290 | Tuning non-reciprocity between two circuit QED modules II – nonlinear interactions | van Geldern, Sean; Wang, Yingying; Wang, Yuxin; Connolly, Thomas; Clerk, Aashish; Wang, Chen | Here we aim to introduce non-reciprocity to nonlinear interactions that are central to quantum information processing. | Session 19: Hybrid Quantum Systems II – Optomechanics |

291 | Reactivity studies in growth of strained InAs-Al heterostructures | Strickland, William; Yuan, Joseph; Hatefipour, Mehdi; Barati, Fatemeh; Dartiailh, Matthieu; Sardashti, Kasra; Tong, Joshua; Bangsaruntip, Sarunya; Lee, Sanghoon; Spratt, William; Rice, Phillip; Topuria, Teya; Shabani, Javad | For this reason, we investigate the growth of InAs/Al heterostructures strained to the underlying InP substrate. | Session 19: Hybrid Quantum Systems II – Optomechanics |

292 | Engineering arbitrary two-mode Gaussian control using a multi-mode coupler | Chowdhury, Shoumik; Zhang, Mengzhen; Jiang, Liang | In this work, we develop a similar interference-based scheme that can engineer arbitrary two-mode Gaussian unitary operations between desired modes of a multimode system. | Session 19: Hybrid Quantum Systems II – Optomechanics |

293 | Interference-based universal decoupling and swapping | Zhang, Mengzhen; Chowdhury, Shoumik; Jiang, Liang | In this work, we present a universal interference-based scheme for converting multi-mode Gaussian interactions into decoupling or swapping operation of arbitrary selected modes. | Session 19: Hybrid Quantum Systems II – Optomechanics |

294 | Acoustic spontaneous emission by a superconducting qubit | Jain, Vijay; Lei, Chan U; Yoon, Taekwan; Dahmani, Yanni; Gnezdilov, Nikolay; Kurilovich, Vladislav; Frunzio, Luigi; Glazman, Leonid; Rakich, Peter; Schoelkopf, Robert | With these improvements and an increase in the electro-mechanical coupling, we observe weak dispersive interactions between the qubit and phonon. | Session 19: Hybrid Quantum Systems II – Optomechanics |

295 | Flux-mediated electromechanical coupling between a mechanical oscillator and superconducting qubit | Bera, Tanmoy; Majumder, Sourav; Sahu, Sudhir; Singh, Vibhor | Here we explore the performance of a hybrid electromechanical system based on the magnetic flux-based coupling. | Session 19: Hybrid Quantum Systems II – Optomechanics |

296 | Effect of Laser Illumination on Niobium Transmon Qubits for Quantum Transduction | Banker, Jash; Meesala, Srujan; Sipahigil, Alp; Chiappina, Piero; Lake, David; Wood, Steven; Painter, Oskar | In this work, we study the effects of pulsed laser light on a transmon qubit with a Nb capacitor and Al Josephson junctions. | Session 19: Hybrid Quantum Systems II – Optomechanics |

297 | Strong non-reciprocal and non-linear transport of photons mediated by a single quantum emitter | Antoniadis, Nadia; Javadi, Alisa; Tomm, Natasha; Schott, Rüdiger; Valentin, Sascha; Wieck, Andreas; Ludwig, Arne; Warburton, Richard | Here, we present a system showing both a highly non-reciprocal and non-linear response using a semiconductor quantum dot in a tunable microcavity [1]. | Session 19: Hybrid Quantum Systems II – Optomechanics |

298 | Engineering Entangled Photon Pairs with Metal-Organic Framework Materials | Fritz, Ruben; Colón, Yamil; Herrera, Felipe | We develop a multi-scale method to study the wavefunction of entangled photon pairs generated by selected non-centrosymmetric MOF crystals via spontaneous parametric down-conversion [2]. | Session 19: Hybrid Quantum Systems II – Optomechanics |

299 | Tuning non-reciprocity between two circuit QED modules I – linear interactions | Wang, Yingying; van Geldern, Sean; Connolly, Thomas; Shilcusky, Alexander; Clerk, Aashish; Wang, Chen | Using single crystalline yttrium iron garnet (YIG) in a waveguide-based package, we directly integrate a pair of shielded superconducting cavities with a low-loss custom-designed circulator, which has insertion loss of ~1% and isolation of >20 dB in the quantum region. | Session 19: Hybrid Quantum Systems II – Optomechanics |

300 | On-chip microwave spectroscopy of Andreev and Majorana bound states in semiconductor nanowires | Geresdi, Attila | In this talk, I will summarize our efforts to understand the Andreev level spectra in proximitized semiconductor nanowires by exploiting the AC Josephson effect and using on-chip microwave detection techniques based on superconducting tunnel junctions. | Session 20: Hybrid Superconducting Quantum Circuits |

301 | Coherent Semiconductor-Based Superconducting Quantum Circuits | Petersson, Karl | The recent development of semiconductors with epitaxial superconducting Al contacts offers new approaches to realizing coherent superconducting quantum devices. | Session 20: Hybrid Superconducting Quantum Circuits |

302 | A ballistic graphene superconducting microwave circuit | Steele, Gary; Schmidt, Felix; Jenkins, Mark; Watanabe, Kenji; Taniguchi, Takashi | In this talk, I will present our demonstration of a superconducting microwave circuit based on a ballistic graphene Josephson junction. | Session 20: Hybrid Superconducting Quantum Circuits |

303 | Magnetic-field-compatible hybrid superconducting circuits | Kou, Angela | In this talk, I will discuss our work building a magnetic-field-compatible nanowire-based fluxonium. | Session 20: Hybrid Superconducting Quantum Circuits |

304 | Coherent control of a hybrid superconducting circuit made with van der Waals heterostructures | Oliver, William | In this talk, we present the demonstration of a superconducting transmon qubit realized using a graphene-based weak-link junction. | Session 20: Hybrid Superconducting Quantum Circuits |

305 | Optomechanical sensors as probes for new physics | Wilson, Dalziel | I’ll discuss one perspective that envisions quantum-limited optomechanical sensors as probes for new physics, highlighting as an example a set of recent proposals for optomechanical dark matter detection. | Session 21: Hybrid/Macroscopic Quantum Systems, Optomechanics, and Interfacing AMO with Solid State/Nano Systems |

306 | A high-cooperativity, silicon nitride transducer for room temperature quantum optomechanics | Bereyhi, Mohammadjafar; Arabmoheghi, Amirali; Engelsen, Nils Johan; Kippenberg, Tobias | We present a nano-optomechanical transducer using high stress silicon nitride that features a one-dimensional optical cavity (Q>10^5) integrated with a high aspect ratio nanobeam resonator(Q>10^6). | Session 21: Hybrid/Macroscopic Quantum Systems, Optomechanics, and Interfacing AMO with Solid State/Nano Systems |

307 | Boundary Condition Perturbation Theory of Optical Resonances of Deformed Dielectric Spheres | Gohsrich, Julius; Shah, Tirth; Aiello, Andrea | In this talk, I discuss how to employ this approach to determine the Q-factor of slightly deformed dielectric spheres. | Session 21: Hybrid/Macroscopic Quantum Systems, Optomechanics, and Interfacing AMO with Solid State/Nano Systems |

308 | Casimir spring and dilution in macroscopic cavity optomechanics | Pate, Jacob; Goryachev, Maxim; Chiao, Raymond; Sharping, Jay; Tobar, Michael | We demonstrate a new way to achieve this through the first observation of Casimir spring and dilution in macroscopic optomechanics, by coupling a metallic SiN membrane to a photonic re-entrant cavity [1]. | |

309 | Cavity-less Quantum Optomechanics with Nanostring Mechanical Resonators | Hao, Shan; Singh, Robinjeet; Purdy, Thomas | Here we aim to use a high-quality mechanical string resonator without an optical cavity to the beat standard quantum limit of detecting the string motion. | |

310 | Controlled cavity quantum electrodynamics with molecular ensembles in infrared nanocavities | Triana, Johan; Herrera, Felipe; Arias, Mauricio; Delgado, Aldo; Nishida, Jun; Muller, Eric; Johnson, Samuel; Wilcken, Roland; Raschke, Markus | By comparing with recent nanoprobe spectroscopy data on polymer-coated IR gold antennas as test cases [2,3], we successfully describe the time-domain signatures of the crossover from weak to strong coupling regimes. | |

311 | Cooling of a levitated nanoparticle to the motional quantum ground state | Delic, Uros; Reisenbauer, Manuel; Dare, Kahan; Grass, David; Vuletic, Vladan; Kiesel, Nikolai; Aspelmeyer, Markus | In this talk I will present our latest experimental result on motional ground state cooling of a levitated nanoparticle and discuss next steps toward macroscopic quantum states. | |

312 | Direction-dependent collective speed-up of spontaneous emission in a nanofiber-coupled cloud of atoms | Pennetta, Riccardo; Blaha, Martin; Lechner, Daniel; Rauschenbeutel, Arno; Schneeweiss, Philipp; Volz, Jürgen | We experimentally investigate collective enhancement of light-matter coupling by interfacing a cloud of laser-cooled cesium (Cs) atoms with photons in the evanescent field of an optical nanofiber. | |

313 | Erbium doped crystals for on-chip microwave to optical transduction | Rochman, Jake; Xie, Tian; Bartholomew, John; Craiciu, Ioana; Schwab, Keith; Faraon, Andrei | Here, we present a REI-based transducer using a nanophotonic optical resonator and a superconducting lumped-element microwave resonator on an erbium-doped yttrium orthovanadate substrate. | |

314 | Gaussian control and readout of levitated nanoparticles via coherent scattering | Cernotik, Ondrej; Filip, Radim | In my presentation, I will discuss how coherent scattering can be used to create and measure complex motional states of levitated nanoparticles. | |

315 | Approaching the single-photon strong coupling regime of optomechanics using a Cooper pair transistor | Thyagarajan, Bhargava; Braasch Jr, William; Brock, Benjamin; Kanhirathingal, Sisira; Blencowe, Miles; Rimberg, Alexander | We report experimental progress on the hybrid optomechanical system described in [1]. | |

316 | Cavity piezo-mechanics for microwave-to-optical conversion | Fu, Wei; Han, Xu; Zhong, Changchun; zou, Chang-ling; Xu, Yuntao; Sayem, Ayed Al; Xu, Mingrui; Wang, Sihao; Cheng, Risheng; Jiang, Liang; Tang, Hong | Here, we report an integrated superconducting cavity piezo-optomechanical platform where 10-GHz phonons are resonantly coupled with photons in a superconducting cavity and a nanophotonic cavity simultaneously. | |

317 | Coupled cavities beyond standard coupled mode theory | Smith, Kevin; Masiello, David | In this work, we present a first-principles theoretical description of coupled cavities with semi-analytical predictivity beyond the scope of CMT without introducing phenomenological parameters. | |

318 | Topological phonon transport in an optomechanical system | Ren, Hengjiang; Shah, Tirth; Pfeifer, Hannes; Brendel, Christian; Peano, Vittorio; Marquardt, Florian; Painter, Oskar | We present the observation of topological phonon transport within a multiscale optomechanical crystal structure consisting of an array of over 800 cavity-optomechanical elements. | |

319 | Ground state cooling of a radio-frequency LC circuit in an optoelectromechanical system | Malossi, Nicola; Piergentili, Paolo; Li, Jie; Serra, Enrico; Natali, Riccardo; Di Giuseppe, Giovanni; Vitali, David | We present a complete theory for laser cooling of a macroscopic radio-frequency LC electrical circuit by means of an optoelectromechanical system, consisting of an optical cavity dispersively coupled to a nanomechanical oscillator, which is in turn capacitively coupled to the LC circuit of interest. | |

320 | Hierarchical tensile structures with ultralow dissipation | Engelsen, Nils Johan; Groth, Robin; Beccari, Alberto; Bereyhi, Mohammadjafar; Fedorov, Sergey; Kippenberg, Tobias | We report nanofabricated resonators with exceptionally low mechanical dissipation rates enabled by an unconventional type of “soft-clamping" which emerges in branched systems of tensioned strings. | |

321 | Large Quantum Delocalization of a Levitated Nanoparticle using Optimal Control: Applications for Force Sensing and Entangling via Weak Forces | Roda-Llordes, Marc; Weiss, Talitha; Torrontegui, Erik; Romero-Isart, Oriol | We propose to optimally control the harmonic potential of a levitated nanoparticle to quantum delocalize its center-of-mass motional state to a length scale orders of magnitude larger than the quantum zero-point motion. | |

322 | Levitation of a permanent magnet within a superconducting radio frequency cavity | Raut, Nabin; Miller, Jeffery; Pate, Jacob; Chiao, Raymond; Sharping, Jay | We report on the magnetic levitation of millimeter-sized neodymium permanent magnets within the interior of a superconducting radio frequency (SRF) cavity. | |

323 | Magnetic interfaces between spin waves and nitrogen-vacancy centers | Gonzalez-Ballestero, Carlos; van der Sar, Toeno; Romero-Isart, Oriol | In this work, we provide a full quantum theory of spin wave-quantum emitter interfaces, focusing on an ensemble of nitrogen-vacancy centres in diamond (NVs) in the vicinity of an Yttrium-Iron-Garnet thin film. | |

324 | Magnon-exciton proximity coupling at a van der Waals heterointerface | Gloppe, Arnaud; Onga, Masaru; Hisatomi, Ryusuke; Imamoglu, Atac; Nakamura, Yasunobu; Iwasa, Yoshihiro; Usami, Koji | We report the magnon-exciton coupling at the interface between a magnetic thin film and an atomically-thin semiconductor. | |

325 | Measurements of High-Order Phonon Correlations in an Optomechanical System via Single-Photon Detection | Yu, Jiaxin; Patil, Yogesh; Frazier, Sean; Wang, Yiqi; Fox, Jared; Garcia, Sébastien; Ott, Konstantin; Reichel, Jakob; Harris, Jack | We have used photon-counting techniques to probe and control the state of an acoustic mode having an effective mass of 6 ng. | |

326 | Measurement of Non-classical Photon-Phonon States in a Superfluid Optomechanical System | Wang, Yiqi; Patil, Yogesh; Yu, Jiaxin; Frazier, Sean; Fox, Jared; Garcia, Sébastien; Ott, Konstantin; Reichel, Jakob; Harris, Jack | We use photon-counting techniques to demonstrate the violation of a classical bound on photon-phonon correlations that is set by the Cauchy-Schwarz inequality, thereby revealing the state’s P-function negativity [3,4]. | |

327 | Measurement of the Eigenvalue Braiding in the Vicinity of a Triple Exceptional Point | Patil, Yogesh; Hoeller, Judith; Henry, Parker; Guria, Chitres; Zhang, Yiming; Jiang, Luyao; Kralj, Nenad; Read, Nicholas; Harris, Jack | In the following talk, we describe measurements of the locations of the ΕΡ 2’s in the neighborhood of the ΕΡ 3, and show that they form a trefoil knot. | |

328 | Measuring the Trefoil Knot of Degneracies Around a Triple Exceptional Point | Henry, Parker; Patil, Yogesh; Hoeller, Judith; Guria, Chitres; Zhang, Yiming; Jiang, Luyao; Kralj, Nenad; Read, Nicholas; Harris, Jack | These measurements (and the measurements of eigenvalue braids presented in the preceding talk) agree well with calculations based on this specific device’s optomechanical properties. | |

329 | Imaging and localizing individual atoms interfaced with a nanophotonic waveguide | Meng, Yijian; Liedl, Christian; Pucher, Sebastian; Rauschenbeutel, Arno; Schneeweiss, Philipp | We detect trapped atoms within 150 ms and record image sequences of given atoms. | |

330 | Mediating dipole-dipole-interactions using three-dimensional atomic arrays | Brechtelsbauer, Katharina; Malz, Daniel | Here, we propose using a simple cubic three-dimensional array of atoms to produce an omnidirectional bandgap for light and show that it enables coherent, dissipation-free interactions between embedded impurities. | |

331 | Strong Coupling of a Single Trapped Atom to a Whispering-Gallery-Mode Microresonator | Will, Elisa; Masters, Luke; Rauschenbeutel, Arno; Scheucher, Michael; Volz, Jürgen | Using this method, we observe a vacuum Rabi-splitting in the excitation spectrum of the coupled system, which demonstrates that we reach the strong coupling regime. | |

332 | 3D-integrated 25-qubit quantum annealing processor with high coherence, individualized control, and modular architecture. Part 1: design. | Novikov, Sergey; Murray, Roy; Leonard, Edward; Marakov, Alexander; Chamberlin, Thomas; Basham, James; Grover, Jeffrey; Disseler, Steven; Das, Rabindra; Kim, David; Mallek, Justin; Niedzielski, Bethany; Rosenberg, Danna; Woods, Wayne; Yost, Donna-Ruth; Yoder, Jonilyn; Oliver, William; Lidar, Daniel; Zick, Kenneth; Ferguson, David | We detail a novel design approach where the control and readout circuitry are routed through multiple chip tiers to create a modular architecture, and discuss how the device opens new horizons for both algorithm and hardware prototyping. | Session 22: I/O, Packaging, and 3D Integration for Superconducting and Semiconductor Qubits |

333 | 3D-integrated off-chip flux tuning of coaxial transmons with low crosstalk | Fasciati, Simone; Campanaro, Giulio; Rahamim, Joseph; Spring, Peter; Tsunoda, Takahiro; Cao, Shuxiang; Wills, James; Bakr, Mustafa; Chidambaram, Vivek; Shteynas, Boris; Vlastakis, Brian; Leek, Peter | Here we demonstrate a 3D-integrated architecture for off-chip local flux tuning of gradiometric coaxial transmon qubits, with low crosstalk and large bandwidth. | Session 22: I/O, Packaging, and 3D Integration for Superconducting and Semiconductor Qubits |

334 | 3D integration for superconducting qubits | Schwartz, Mollie | Here, we describe a three-tier approach to 3D integration for superconducting qubits, comprising: a planarized, superconducting multilayer metallization chip; an interposer featuring compact, high-aspect ratio, superconducting thru-silicon vias (TSVs); and a qubit chip. | Session 22: I/O, Packaging, and 3D Integration for Superconducting and Semiconductor Qubits |

335 | High coherence in a tileable superconducting circuit | Spring, Peter; Cao, Shuxiang; Campanaro, Giulio; Fasciati, Simone; Tsunoda, Takahiro; Wills, James; Shteynas, Boris; Chidambaram, Vivek; Bakr, Mustafa; Vlastakis, Brian; Leek, Peter | We provide a careful experimental analysis of packaging crosstalk and show that the off-chip wiring is highly selective. | Session 22: I/O, Packaging, and 3D Integration for Superconducting and Semiconductor Qubits |

336 | 3D integration of superconducting quantum systems – part 1: 3-tier design and connectivity | Yoder, Jonilyn; Hirjibehedin, Cyrus; Yost, Donna-Ruth; Mallek, Justin; Rosenberg, Danna; Schwartz, Mollie; Das, Rabindra; Bolkhovsky, Vladimir; Day, Alexandra; Golden, Evan; Hazard, Thomas; Kim, David; Knecht, Jeffrey; Melville, Alexander; Niedzielski, Bethany; Purcell-Schuldt, Meghan; Rastogi, Ravi; Serniak, Kyle; Weber, Steven; Woods, Wayne; Zarr, Scott; Kerman, Andrew; Oliver, William | We describe a 3D-integrated 3-tier stack architecture for superconducting quantum circuits to enable enhanced connectivity while preserving qubit coherence. | Session 22: I/O, Packaging, and 3D Integration for Superconducting and Semiconductor Qubits |

337 | 3D integration of superconducting quantum systems – part 2: Interposer tier with superconducting TSVs and qubits | Yost, Donna-Ruth; Hirjibehedin, Cyrus; Yoder, Jonilyn; Mallek, Justin; Rosenberg, Danna; Schwartz, Mollie; Das, Rabindra; Bolkhovsky, Vladimir; Day, Alexandra; Golden, Evan; Hazard, Thomas; Kim, David; Knecht, Jeffrey; Melville, Alexander; Niedzielski, Bethany; Purcell-Schuldt, Meghan; Rastogi, Ravi; Serniak, Kyle; Weber, Steven; Woods, Wayne; Zarr, Scott; Kerman, Andrew; Oliver, William | We present our fabrication process for this active interposer tier, as well as characterization data for superconducting TSVs and qubits. | Session 22: I/O, Packaging, and 3D Integration for Superconducting and Semiconductor Qubits |

338 | 3D integration of superconducting quantum systems – part 3: Preserving qubit coherence | Hirjibehedin, Cyrus; Yoder, Jonilyn; Yost, Donna-Ruth; Mallek, Justin; Rosenberg, Danna; Schwartz, Mollie; Das, Rabindra; Bolkhovsky, Vladimir; Day, Alexandra; Golden, Evan; Hazard, Thomas; Kim, David; Knecht, Jeffrey; Melville, Alexander; Niedzielski, Bethany; Purcell-Schuldt, Meghan; Rastogi, Ravi; Serniak, Kyle; Weber, Steven; Woods, Wayne; Zarr, Scott; Kerman, Andrew; Oliver, William | We demonstrate the operation and local control of high-coherence capacitively-shunted flux qubits (CSFQs) in a 3D-integrated 3-tier architecture. | Session 22: I/O, Packaging, and 3D Integration for Superconducting and Semiconductor Qubits |

339 | Tunable Capacitor For Superconducting Qubits Using an InAs/InGaAs Heterostructure | Materise, Nicholas; Dartiailh, Matthieu; Shabani, Javad; Kapit, Eliot | We present a blueprint for a gate-tunable coupler realized with a two-dimensional electron gas in an InAs/InGaAs heterostructure. | Session 22: I/O, Packaging, and 3D Integration for Superconducting and Semiconductor Qubits |

340 | Scalable packaging design for large-scale superconducting quantum circuits | Tamate, Shuhei; Tabuchi, Yutaka; Szikszai, Laszlo; Kusuyama, Koichi; Zuo, Kun; Yan, Zhiguang; Badrutdinov, Alexander; Hishida, Yuji; Qiu, Wei; Terai, Hirotaka; Fujii, Go; Makise, Kazumasa; Watanabe, Naoya; Nakagawa, Hiroshi; Fujino, Masahisa; Ukibe, Masahiro; Mizubayashi, Wataru; Kikuchi, Katsuya; Nakamura, Yasunobu | To overcome this difficulty, we propose scalable packaging and wiring schemes based on the vertical connection of coaxial cables from the bottom of the chip. | Session 22: I/O, Packaging, and 3D Integration for Superconducting and Semiconductor Qubits |

341 | Design and Characterization of Microwave Packages for Superconducting Qubits | Huang, Sihao; Lienhard, Benjamin; Calusine, Greg; Vepsäläinen, Antti; Braumueller, Jochen; Kim, David; Wang, Joel; Melville, Alexander; Niedzielski, Bethany; Yoder, Jonilyn; Kannan, Bharath; Orlando, Terry; Gustavsson, Simon; Oliver, William | We present results from simulations and demonstrate the corresponding physical characterization of the electromagnetic environment of the qubit. | Session 22: I/O, Packaging, and 3D Integration for Superconducting and Semiconductor Qubits |

342 | 3D-integrated 25-qubit quantum annealing processor with high coherence, individualized control, and modular architecture. Part 2: characterization. | Basham, James; Grover, Jeffrey; Disseler, Steven; Gibson, Joseph; Leonard, Edward; Marakov, Alexander; Bolkhovsky, Vladimir; Cummings, John; Das, Rabindra; Hirjibehedin, Cyrus; Knecht, Jeffrey; Mallek, Justin; Niedzielski, Bethany; Rastogi, Ravi; Rosenberg, Danna; Serniak, Kyle; Weber, Steven; Yost, Donna-Ruth; Zarr, Scott; Yoder, Jonilyn; Oliver, William; Lidar, Daniel; Ferguson, David; Zick, Kenneth; Novikov, Sergey | We have designed, fabricated, and measured an advanced quantum annealing processor comprised of 25 capacitively-shunted flux qubits (CSFQs) connected by 40 rf-SQUID tunable couplers. | Session 22: I/O, Packaging, and 3D Integration for Superconducting and Semiconductor Qubits |

343 | Scalable architecture for next generation superconducting quantum processors | Suttle, Joseph; Sundaresan, Neereja; Srinivasan, Srikanth; Sirianni, Joseph; Fraczak, Gloria; Carniol, April; Shanks, Will; Lewandowski, Eric; Cotte, John; Nah, Jae-woong; Kumph, Muir; Donaton, Ricardo; Abraham, David | We discuss a new architecture for superconducting qubits which uses multilevel wiring built off of advanced packaging techniques such as indium bump bonds and through-silicon vias. | Session 22: I/O, Packaging, and 3D Integration for Superconducting and Semiconductor Qubits |

344 | 3D Package for Quantum Integrated Circuits | Paquette, Jean-Philip; Vahidpour, Mehrnoosh; Sing, Molly; Bestwick, Andrew; Sur, Biswajit; Jackson, Keith; Selvanayagam, Michael | We present a 3D package that leverages existing vertical interconnect technology and newly developed chip interface management for cryogenic environments. | Session 22: I/O, Packaging, and 3D Integration for Superconducting and Semiconductor Qubits |

345 | High-density I/O for next-generation quantum annealing: Part 2—Device packaging | Cummings, John; Weber, Steven; Miloshi, Jovi; Thompson, Kyle; Rokosz, John; Holtman, David; Conway, David; Kerman, Andrew; Oliver, William | In this presentation, we will discuss our efforts to develop high-density packaging for use in next-generation quantum annealers. | Session 22: I/O, Packaging, and 3D Integration for Superconducting and Semiconductor Qubits |

346 | CMOS-based cryogenic control of silicon quantum circuits | Patra, Bishnu; Xue, Xiao; van Dijk, Jeroen; Samkharadze, Nodar; Subramanian, Sushil; Corna, Andrea; Jeon, Charles; Sheikh, Farhana; Juarez-Hernandez, Esdras; Esparza, Brando; Rampurawala, Huzaifa; Carlton, Brent; Ravikumar, Surej; Nieva, Carlos; Kim, Sungwon; Lee, Hyung-Jin; Sammak, Amir; Scappucci, Giordano; Veldhorst, Menno; Sebastiano, Fabio; Babaie, Masoud; Pellerano, Stefano; Charbon, Edoardo; Vandersypen, Lieven | Here we report a cryogenic CMOS control chip operating at 3 K, which outputs tailored microwave bursts to drive silicon quantum bits cooled to 20 mK. | Session 22: I/O, Packaging, and 3D Integration for Superconducting and Semiconductor Qubits |

347 | Flexible Coaxial Ribbon Cable for High-Density Superconducting Microwave Device Arrays | Smith, Jenny; Mazin, Benjamin; Walter, Alex; Daal, Miguel; Bailey, J. I.; Bockstiegel, Clinton; Zobrist, Nicholas; Swimmer, Noah; Steiger, Sarah; Fruitwala, Neelay | We report the design and fabrication of superconducting 53 wt% Nb-47 wt% Ti (Nb47Ti) FLexible coAXial ribbon cables (FLAX). | Session 22: I/O, Packaging, and 3D Integration for Superconducting and Semiconductor Qubits |

348 | Customized high channel density and IR-filtered cryogenic cable solution characterization for quantum test environments | Tétrault, Marc-André; Colas, Laurent; Wong, Chun Heung; Vermeulen, Kiefer; Bos, Wouter; Kuitenbrouwer, Daan; michael.r.lacerte@USherbrooke.ca, Michael; Pioro-Ladriere, Michel | As part of the development of a common test environment, the Institut Quantique in Sherbrooke is investigating and characterizing customized multichannel cable solutions from Delft Circuits. | Session 22: I/O, Packaging, and 3D Integration for Superconducting and Semiconductor Qubits |

349 | Motherboard for superconducting qubit readout | Abdo, Baleegh; Beckley, Michael; Rettner, Charles; Trimm, Bryan; Magbitang, Teddie; Nah, Jae-woong; Olivadese, Salvatore; Bronn, Nick; Jinka, Oblesh | To solve this problem, we develop nonreciprocal Josephson devices [1] that could replace magnetic circulators and isolators and form in combination with other on-chip components, scalable motherboards for qubit readout [2]. | Session 22: I/O, Packaging, and 3D Integration for Superconducting and Semiconductor Qubits |

350 | Control and readout of a superconducting qubit using a photonic link | Lecocq, Florent; Quinlan, Franklyn; Cicak, Katarina; Aumentado, Jose; Diddams, Scott; Teufel, John | In this talk we demonstrate the control and readout of a superconducting qubit using microwave signals transmitted over optical fiber to the ultracryogenic environment (< 20 mK) and show a proof of principle that this novel method can meet the stringent requirements for superconducting quantum information processing [1]. | Session 22: I/O, Packaging, and 3D Integration for Superconducting and Semiconductor Qubits |

351 | Coherent on-chip microwave source based on a voltage-biased Josephson junction | Yan, Chengyu; Hassel, Juha; Vesterinen, Visa; Zhang, Jinli; Ikonen, Joni; Grönberg, Leif; Goetz, Jan; Möttönen, Mikko | In this work, we present a quantitative study of an on-chip coherent microwave source based on a Josephson junction strongly coupled to a mode of a superconducting resonator, both theoretically and experimentally. | Session 22: I/O, Packaging, and 3D Integration for Superconducting and Semiconductor Qubits |

352 | A 22nm FD-SOI-CMOS Scalable Quantum Processor SoC with Fully Integrated Control Electronics at 3.5K | BASHIR, IMRAN; Leipold, Dirk; Asker, Mike; Blokhina, Elena; Redmond, David; Staszewski, Bogdan; Esmailiyan, Ali; Giounanlis, Panagiotis; Andrademiceli, Dennis; Sokolov, Andrii; Wu, Xutong | This paper describes a monolithic integration of the semiconductor quantum core and its associated classic control circuitry manufactured in the 22FDX fully depleted silicon-on-insulator (FD-SOI) technology from GlobalFoundries. | Session 22: I/O, Packaging, and 3D Integration for Superconducting and Semiconductor Qubits |

353 | High-density I/O for next-generation quantum annealing: Part 1—Cryogenic wiring | Weber, Steven; Cummings, John; Miloshi, Jovi; Thompson, Kyle; Rokosz, John; Holtman, David; Conway, David; Kerman, Andrew; Oliver, William | In this presentation, we will discuss our efforts to develop high-density fridge wiring for use in next-generation quantum annealers. | Session 22: I/O, Packaging, and 3D Integration for Superconducting and Semiconductor Qubits |

354 | Cryogenic microwave frequency filters beyond 20 GHz and their impact on superconducting quantum circuits | Danilin, Sergey; Barbosa, Joao; Zhao, Zimo; Farage, Michael; Burnett, Jonathan; Li, Chong; Weides, Martin | These parameters are distinct for CR-110 and Esorb-230 tested in the work. | Session 22: I/O, Packaging, and 3D Integration for Superconducting and Semiconductor Qubits |

355 | Cryogenic diplexers for the dual application of sweepable gate bias and quantum control signals for spin qubits application | Kriekouki, Ioanna; Colas, Laurent; Roux, Marc-Antoine; Pioro-Ladriere, Michel; Tétrault, Marc-André | As part of the development of a common test environment, we are investigating and characterizing a customized cryogenic diplexer solution from Quantum Microwave. | Session 22: I/O, Packaging, and 3D Integration for Superconducting and Semiconductor Qubits |

356 | Challenges and methodology of assembing Edgeless Four Side Tileable ROICs for a Wafer Scale, Deadzone-less Camera utilizing high density interconnects. | Fahim, Farah | Challenges and methodology of assembing Edgeless Four Side Tileable ROICs for a Wafer Scale, Deadzone-less Camera utilizing high density interconnects. | Session 22: I/O, Packaging, and 3D Integration for Superconducting and Semiconductor Qubits |

357 | Scalable Quantum i/o: Integrated Cryogenic Microwave Components in Flexible Stripline Structures | Wong, Chun Heung; Vermeulen, Kiefer; Bos, Wouter; van Gulik, Ruben; Sorgedrager, Riemer; Sarsby, Matthew; Kuitenbrouwer, Daan; van den Brink, Rob; Kammhuber, Jakob; Bosman, Sal | In this work, we present a monolithic, multilayer, flexible circuit, which directly connects room temperature electronics to a milliKelvin interface of a quantum device. | Session 22: I/O, Packaging, and 3D Integration for Superconducting and Semiconductor Qubits |

358 | Field Demonstration of a Multiple Trusted Node Quantum Key Distribution on an Electric Utility Fiber Network | Alshowkan, Muneer; Evans, Philip; Peters, Nicholas; Earl, Duncan; Grice, Warren; Mulkay, Daniel; Jones, Ken; Morgan, Tyler; Morrison, Steve; Newell, Raymond; Peterson, Glen; Safi, Claira; Tripp, Justin | Quantum Key Distribution (QKD) provides a unique solution for the distribution of secret keys used for information authentication and encryption. | Session 23: Long Distance Quantum Communication |

359 | Robust quantum-network memory using spin qubits in isotopically-purified diamond | Bradley, Conor; de Bone, Sebastian; Moller, Paul; Degen, Maarten; Loenen, Sjoerd; Bartling, Hans; Elkouss, David; Taminiau, Tim Hugo | In this work, we utilize isotopic engineering of diamond to improve the performance of a nuclear spin quantum network memory by two orders-of-magnitude over the state of the art. | Session 23: Long Distance Quantum Communication |

360 | Bounding the forward classical capacity of bipartite quantum channels | Ding, Dawei; Khatri, Sumeet; Quek, Yihui; Shor, Peter; Wang, Xin; Wilde, Mark | We introduce various measures of forward classical communication for bipartite quantum channels. | Session 23: Long Distance Quantum Communication |

361 | Spooky Action at a Global Distance — Analysis of Space-Based Entanglement Distribution for the Quantum Internet | Khatri, Sumeet; Brady, Anthony; Desporte, Renee; Bart, Manon; Dowling, Jonathan | In this work, we propose a global-scale quantum internet consisting of a constellation of orbiting satellites that provides a continuous, on-demand entanglement distribution service to ground stations. | Session 23: Long Distance Quantum Communication |

362 | Efficient computation of the waiting time and fidelity in quantum repeater chains | Coopmans, Tim; Li, Boxi; Brand, Sebastiaan; Elkouss, David | Our contributions thus serve as useful tools for the design and realization of long-distance quantum communication networks. | Session 23: Long Distance Quantum Communication |

363 | Scalable Quantum Network Architectures and Their Simulations | Suchara, Martin; Wu, Xiaoliang; Kolar, Alexander; Chung Miranda, Joaquin; Jin, Dong; Zhong, Tian; Kettimuthu, Rajkumar | We describe how the modularized design of the Simulator of QUantum Network Communication (SeQUeNCe) we developed allows comparisons of alternative architecture designs that assign different roles to layers in the control protocol stack. | Session 23: Long Distance Quantum Communication |

364 | Simulation of Quantum Network Protocols with SeQUeNCe | Wu, Xiaoliang; Kolar, Alexander; Chung Miranda, Joaquin; Jin, Dong; Zhong, Tian; Kettimuthu, Rajkumar; Suchara, Martin | We develop models of quantum network protocols and simulate their behavior in metropolitan optical quantum networks equipped with repeater nodes. | Session 23: Long Distance Quantum Communication |

365 | Autonomous calibration of quantum networks using Bayesian optimization | Cortes, Cristian; Lefebvre, Pascal; Sinclair, Neil; Oblak, Daniel; Gray, Stephen | In this talk, we present a Bayesian optimization algorithm for automating the calibration of single-photon states. | Session 23: Long Distance Quantum Communication |

366 | Purification and Entanglement Routing on Quantum Networks | Victora, Michelle; Krastanov, Stefan; Sanchez de la Cerda, Alexander; Willis, Steven; Narang, Prineha | Here, we present how a quantum network, equipped with imperfect channel fidelities and limited memory storage time can distribute entanglement between users, using adaptable purification schemes. | Session 23: Long Distance Quantum Communication |

367 | Caltech and Fermilab Quantum Network Test Beds | Spiropulu, Maria; Valivarthi, Raju; Davis, Samantha; Sinclair, Neil; Oblak, Daniel; Spentzouris, Panagiotis; Pena, Cristian; Xie, Si; Lauk, Nikolai; Navraez, Lautaro; Korzh, Boris; Simon, Christoph; Mueller, Andrew; Shaw, Matthew | Using fiber-coupled devices, including state-of-the-art low-noise superconducting nanowire single photon detectors and off-the-shelf optics, we achieve quantum teleportation of time-bin qubits with fidelities ≥90% at the telecommunication, and quantum memory-compatible, wavelength of 1536.5 nm. | Session 23: Long Distance Quantum Communication |

368 | Key device and materials specifications for a repeater enabled quantum internet | Singh, Manish Kumar; Jiang, Liang; Awschalom, David; Guha, Supratik | We present a framework that uses a modular model of QR and highlights the trade-offs that exist between technological components. | Session 23: Long Distance Quantum Communication |

369 | Illinois Express Quantum Network (IEQNET) — Metropolitan-Scale Experimental Quantum Network testbed | Spiropulu, Maria; Lauk, Nikolai; Spentzouris, Panagiotis | We will describe the network architecture of IEQNET, including the Internet-inspired layered hierarchy that leverages software-defined-networking (SDN) technology to perform traditional wavelength routing and assignment between the Q-nodes. | Session 23: Long Distance Quantum Communication |

370 | Challenges in building the quantum internet from space. | Ling, Alexander | In this talk, I will review the challenges and suggest some requirements to enable such a network to be built. | Session 23: Long Distance Quantum Communication |

371 | An inorganic shadow-mask platform for Josephson junction fabrication | Gao, Ran; Deng, Hao; Bao, Feng; Ku, Hsiang-Sheng; Jiang, Xun; Li, Zhisheng; Ni, Xiaotong; Qin, Jin; Song, Zhijun; Sun, Hantao; Tang, Chengchun; Wang, Tenghui; Wu, Feng; Yu, Wenlong; Xia, Tian; Zhang, Gengyan; Zhang, Xiaohang; Zhou, Jingwei; Zhu, Xing; Wang, Minghua; Wu, Yingchun; Li, Xijun; Zhao, Hui-Hai; Deng, Chunqing | To resolve this challenge and to further improve the process versatility of the shadow-evaporation technique, we demonstrate a simple and robust inorganic shadow-mask platform based on a silicon compound that helps to increase the thermal budget and reduce the sensitivity of mask materials to various process steps. | Session 24: Materials and Fabrication in Superconducting Qubits I – Josephson Junctions |

372 | Fabrication parameters for frequency targeting in scalable superconducting quantum processors | Muthusubramanian, Nandini; Duivestein, Wilhelmus; Zachariadis, Chris; Finkel, Matvey; Bruno, Alessandro; DiCarlo, Leonardo | We present a systematic approach to determine the causes of spread in Al-AlOx-Al Josephson junctions (apart from intrinsic variations in the tunnel barrier) with increased complexity of the quantum plane. | Session 24: Materials and Fabrication in Superconducting Qubits I – Josephson Junctions |

373 | Highly Uniform Submicron Junction Arrays for Quantum Information Processing | Kreikebaum, John Mark; Chen, Larry; Morvan, Alexis; Ville, Jean-Loup; O’Brien, Kevin; Siddiqi, Irfan | Analyzing junction array resistance distributions from many wafers, we have identified several key processing variables to improve uniformity. | Session 24: Materials and Fabrication in Superconducting Qubits I – Josephson Junctions |

374 | Capacitively shunted flux qubit based on epitaxially grown NbN/AlN/NbN Josephson junctions on Si substrate | Kim, Sunmi; Terai, Hirotaka; Yamashita, Taro; Qiu, Wei; Fuse, Tomoko; Yoshihara, Fumiki; Inomata, Kunihiro; Semba, Kouichi | Early studies of superconducting qubits using epitaxially grown nitride JJs have shown significant potential, but their coherence time was limited due to dielectric loss from the MgO substrate [1]. | Session 24: Materials and Fabrication in Superconducting Qubits I – Josephson Junctions |

375 | Design and Characterization of a Functional Merged Element Transmon | Mamin, Harry; Huang, Elbert; Carnevale, Santino; Kurter, Cihan; Trimm, Bryan; Sandberg, Martin; Rettner, Charles; Arellano, Noel; Shelby, Robert; Sherwood, Mark; Mueed, M; Madon, Benjamin; Pushp, Aakash; Steffen, Matthias; Rugar, Daniel | We have observed T 1 times typically in the range of 30-50 μs, with some devices exhibiting T 1>100 μs over several hours. | Session 24: Materials and Fabrication in Superconducting Qubits I – Josephson Junctions |

376 | A Merged-element Transmon | ZHAO, RUICHEN; Park, Sungoh; Zhao, Tongyu; Bal, Mustafa; McRae, Corey Rae; Long, Junling; Pappas, David | Here, we present a new approach to address these issues: we merge the coplanar capacitor and the JJ into a single junction made of superconductor/semiconductor/superconductor trilayer. | Session 24: Materials and Fabrication in Superconducting Qubits I – Josephson Junctions |

377 | Efforts towards a low loss all van der Waals parallel plate capacitor for quantum devices | Antony, Abhinandan; Gustafsson, Martin; Rajendran, Anjaly; Ribeill, Guilhem; Benyamini, Avishai; Ohki, Thomas; Fong, Kin; Hone, James | Here we report efforts to fabricate and characterize electrically an all van der Waals (vdW) parallel plate capacitor with low loss at gigahertz frequencies. | Session 24: Materials and Fabrication in Superconducting Qubits I – Josephson Junctions |

378 | Reducing fabrication complexity of Josephson traveling-wave parametric amplifiers | Chang, C. W. Sandbo; Tamate, Shuhei; Urade, Yoshiro; Hung, Jimmy Shih-Chu; Nakamura, Yasunobu | In this work, we propose a JTWPA design with matching structures implemented using coplanar lumped-element waveguides, greatly simplifying the fabrication process. | Session 24: Materials and Fabrication in Superconducting Qubits I – Josephson Junctions |

379 | Continuous Measurement of Quasiparticle Trapping in Aluminum Nanobridge Josephson Junctions | Farmer, James; Zarassi, Azarin; Hartsell, Darian; Levenson-Falk, Eli | We discuss simulated and experimental single-shot fidelity measurements of QPs trapping in the junctions of a nanobridge SQUID embedded in a superconducting resonator. | Session 24: Materials and Fabrication in Superconducting Qubits I – Josephson Junctions |

380 | Quasiparticle Transport in Asymmetric Josephson Junctions | Steffen, Zachary; Li, Kungang; Dutta, Sudeep; Huang, Yizhou; Palmer, Benjamin; Wellstood, Frederick | We discuss low-temperature (T < 50 mK) current – voltage and differential conductance measurements of these asymmetric devices to characterize the behavior of the junctions. | Session 24: Materials and Fabrication in Superconducting Qubits I – Josephson Junctions |

381 | Supercurrent in All-Van-der-Waals Josephson Tunnel Junctions | Li, Qing; Wang, Joel; Yamoah, Megan; Watanabe, Kenji; Taniguchi, Takashi; Orlando, Terry; Gustavsson, Simon; Jarillo-Herrero, Pablo; Oliver, William | In this work, we construct superconducting quantum devices with van der Waals (vdW) materials and their heterostructures, which feature crystalline layers with atomically precise interface. | Session 24: Materials and Fabrication in Superconducting Qubits I – Josephson Junctions |

382 | Which-path experiments on a transmon quantum processor | Cruz, Pedro; Fernández-Rossier, Joaquín | We propose quantum circuits to test the complementarity principle through which-path experiments on symmetric two-way interferometers coupled to a single detector. | Session 24: Materials and Fabrication in Superconducting Qubits I – Josephson Junctions |

383 | Investigation of geometrical effects on merged-element transmon. | Park, Sungoh; ZHAO, RUICHEN; McRae, Corey Rae; McFadden, Anthony; Bal, Mustafa; Zhao, Tongyu; Howard, Joel; Long, Junling; Pappas, David | Recently, we have designed and fabricated a prototype merged-element transmon qubit (mergemon), [1] which may potentially bring several advantages compared to the conventional transmons, such as increased coherence time using low-loss epitaxial substrates, qubit frequency less affected by junction variation, and increased scalability by reduced qubit footprint. | Session 24: Materials and Fabrication in Superconducting Qubits I – Josephson Junctions |

384 | New material platform for superconducting transmon qubits with coherence times exceeding 0.3 milliseconds | Place, Alexander; Rodgers, Lila; Dutta, Aveek; Mundada, Pranav; Smitham, Basil; Fitzpatrick, Mattias; Leng, Zhaoqi; Premkumar, Anjali; Bryon, Jacob Elvin; Sussman, Sara; Cheng, Guangming; Madhavan, Trisha; Babla, Harshvardhan; Jaeck, Berthold; Gyenis, Andras; Yao, Nan; Cava, Robert; De Leon, Nathalie; Houck, Andrew | In this talk we characterize the regions and mechanisms of loss in state-of-the-art two-dimensional qubits. | Session 25: Materials and Fabrication in Superconducting Qubits II – Materials |

385 | A study of intrinsic dielectric loss of tantalum based superconducting quantum circuits | Zhang, Xiaohang; Yu, Wenlong; Bao, Feng; Deng, Hao; Gao, Ran; Jiang, Xun; Ku, Hsiang-Sheng; Li, Zhisheng; Ni, Xiaotong; Qin, Jin; Song, Zhijun; Sun, Hantao; Tang, Chengchun; Wang, Tenghui; Wu, Feng; Xia, Tian; Zhang, Gengyan; Zhou, Jingwei; Zhu, Xing; Zhao, Hui-Hai; Deng, Chunqing | In this talk, we present our work on thin film deposition and etching of tantalum together with film quality analysis. | Session 25: Materials and Fabrication in Superconducting Qubits II – Materials |

386 | Discovering new platforms for high coherence qubits using direct materials characterization | De Leon, Nathalie | I will describe our recent efforts to tackle noise and microwave losses in superconducting qubits. | Session 25: Materials and Fabrication in Superconducting Qubits II – Materials |

387 | Dielectric Loss in Titanium Nitride and Aluminum Superconducting Resonators | Melville, Alexander; Woods, Wayne; Calusine, Greg; Serniak, Kyle; Golden, Evan; Niedzielski, Bethany; Kim, David; Sevi, Arjan; Yoder, Jonilyn; Oliver, William | In this talk, we show that the metal-air interface is the dominant loss in Al devices, whereas each dielectric region contributes significantly in TiN. | Session 25: Materials and Fabrication in Superconducting Qubits II – Materials |

388 | Process Optimization for Superconducting Resonators via Identification and Mitigation of Interface Loss Mechanisms | Banerjee, Archan; HAJR, AHMED; Berk, Cassidy; Kreikebaum, John Mark; Altoe, Virginia; Santiago, David; Ogletree, D. Frank; Siddiqi, Irfan | We report on the characterization and iterative process development of niobium-based CPW resonators. | Session 25: Materials and Fabrication in Superconducting Qubits II – Materials |

389 | Fabrication of Transmon Qubits with Molecular-Beam Epitaxy Aluminum | Huang, Yizhou; Wellstood, Frederick; Richardson, Christopher; Palmer, Benjamin | I will discuss the process and present some transmon and resonator coherence data. | Session 25: Materials and Fabrication in Superconducting Qubits II – Materials |

390 | Fabricating low loss, lumped element niobium resonators | Das, Debadri; Multani, Kevin; Stokowski, Hubert; Safavi-Naeini, Amir; Welander, Paul; Nanni, Emilio | We have modelled our device using the planar 3D EM simulator SONNET, developed a fabrication procedure, fabricated initial prototype circuits, and evaluated device performance in a cryogenic environment. | Session 25: Materials and Fabrication in Superconducting Qubits II – Materials |

391 | Low-loss superconducting coplanar waveguide resonators fabricated with TiN | Gao, Ran; Yu, Wenlong; Bao, Feng; Deng, Hao; Jiang, Xun; Ku, Hsiang-Sheng; Li, Zhisheng; Ni, Xiaotong; Qin, Jin; Song, Zhijun; Sun, Hantao; Tang, Chengchun; Wang, Tenghui; Wu, Feng; Xia, Tian; Zhang, Gengyan; Zhang, Xiaohang; Zhou, Jingwei; Zhu, Xing; Zhao, Hui-Hai; Deng, Chunqing | Here, we report low-loss superconducting coplanar waveguide (CPW) resonators fabricated with high-quality TiN thin films. | Session 25: Materials and Fabrication in Superconducting Qubits II – Materials |

392 | Microwave Loss in High-Q Titanium Nitride Resonators | Zhang, Rui; Alexander, Ashish; Richardson, Christopher; Wellstood, Frederick; Palmer, Benjamin | We compare the measured Q data to a model based on loss from the interaction of the superconducting resonator with lossy two-level systems and separately to a model we have developed based on non-equilibrium quasiparticles accumulating in regions of the TiNx film with a lower superconducting gap. | Session 25: Materials and Fabrication in Superconducting Qubits II – Materials |

393 | Extraction and Modeling of TLS Losses in TiN Qubits | Woods, Wayne; Melville, Alexander; Calusine, Greg; Serniak, Kyle; Golden, Evan; Huffman, Bethany; Kim, David; Sevi, Arjan; Yoder, Jonilyn; Oliver, William | In this talk, we discuss the iterative process development that reduced the effect of these additional fabrication steps. | Session 25: Materials and Fabrication in Superconducting Qubits II – Materials |

394 | FABRICATION APPROACHES TO 3D SUPERCONDUCTING QUBIT RESONATORS WITH A HIGH Q-FACTOR | Carriere, Paul; Kutsaev, Sergey; Agustsson, Ronald; Cleland, Andrew; Frigola, Pedro; Horn, Timothy; Kelly, Michael; Smirnov, Alexander | In this talk, we will discuss the current and future fabrication activities of qubit cavities at RadiaBeam. | Session 25: Materials and Fabrication in Superconducting Qubits II – Materials |

395 | Characterization of Al-based Airbridges for Superconducting Microwave Devices | Najafi Jabdaraghi, Robab; Grönberg, Leif; Vesterinen, Visa; Prunnila, Mika | Here, we demonstrate our latest development of Al airbridges in conjunction with Nb CPWs. | Session 25: Materials and Fabrication in Superconducting Qubits II – Materials |

396 | Thickness-Dependent Superconductor-Insulator Transition of TaN Thin Film Grown with Atomic Layer Deposition | Song, Wonho; Jung, Sungchul; Kim, Junhyung; Choi, Gahyun; Lee, Joonyoung; Chong, Yonuk; Shin, Dongwoo; Kim, Jeehoon; Park, Kibog | In this work, TaN thin films with thicknesses ranging 8.9 nm to 32.6 nm were grown by using plasma enhanced ALD with Tris(diethylamido)(tert-butylimido)tantalum(TBTDET) precursor and H 2 reactant. | Session 25: Materials and Fabrication in Superconducting Qubits II – Materials |

397 | Silicon Colour Centres | Simmons, Stephanie | In this talk I will introduce a variety of silicon colour centres and discuss their properties in isotopically purified silicon-28. | Session 26: Materials for Quantum Information Science – 3 (Novel Materials Systems) |

398 | Quantum information science with rare earths | Paudyal, Durga | We provide an overview of rare earth-doped material properties and summarize some of the most promising oxide host materials studied from ab-initio electronic structure methods that take care of critically important electron correlation, spin orbit coupling, crystal field, quadrupolar and hyperfine interactions, and Zeeman effect to identify and realize quantum states in the gap regime. | Session 26: Materials for Quantum Information Science – 3 (Novel Materials Systems) |

399 | Towards quantum communication nodes using nuclear spins in silicon carbide electronics | Bourassa, Alexandre; Anderson, Christopher; Miao, Kevin; Onizhuk, Mykyta; Ma, He; Wolfowicz, Gary; Crook, Alexander; Mintun, Peter; Abe, Hiroshi; Ul-Hassan, Jawad; Son, Nguyen; Ohshima, Takeshi; Galli, Giulia; Awschalom, David | Here, we demonstrate high fidelity initialization (>99%) and gates (99.984%), as well as extended dephasing (40x improvement) and decoherence (>14 ms) times in this system. | Session 26: Materials for Quantum Information Science – 3 (Novel Materials Systems) |

400 | Discovery and Optical Characterization of Hidden Silicon-Vacancy Centers in Diamond | Smallwood, Christopher; Ulbricht, Ronald; Day, Matthew; Schröder, Tim; Bates, Kelsey; Autry, Travis; Diederich, Geoffrey; Bielejec, Edward; Siemens, Mark; Cundiff, Steven | Here we report a series of novel measurements [1] on a high-density sample of a particular color-center type—negatively charged silicon-vacancy (SiV -) centers in diamond—using collinear optical multidimensional coherent spectroscopy (MDCS). | Session 26: Materials for Quantum Information Science – 3 (Novel Materials Systems) |

401 | Hybridized defects in solid-state materials as artificial molecules | Ciccarino, Christopher; Wang, Derek; Flick, Johannes; Narang, Prineha | Here we present the formation of `artificial molecules’ in solids, introducing a new degree of freedom in control of quantum optoelectronic materials. | Session 26: Materials for Quantum Information Science – 3 (Novel Materials Systems) |

402 | Photoluminescence and Electron-hole Recombination of Defects as Single Photon Emitters in Hexagonal Boron Nitride | LI, Kejun; Smart, Tyler; Ping, Yuan | To unambiguously identify defects responsible for the experimentally detected single-photon emissions in hexagonal boron nitride, we theoretically investigate the photoluminescence and electron-hole recombination mechanism (radiative and nonradiative) of defect candidates, especially carbon related defects. | Session 26: Materials for Quantum Information Science – 3 (Novel Materials Systems) |

403 | Intersystem Crossing and Exciton-Defect Coupling of Spin Defects in Hexagonal Boron Nitride | Smart, Tyler; LI, Kejun; Xu, Junqing; Ping, Yuan | Here we established a complete theoretical framework to accurately and systematically design new quantum defects in wide-bandgap 2D systems. | Session 26: Materials for Quantum Information Science – 3 (Novel Materials Systems) |

404 | Broadening mechanisms of quantum emitters in CVD and exfoliated hexagonal Boron nitride at temperatures ranging 4K-300K on conductive and insulating substrates | Akbari, Hamidreza; Lin, Wei-Hsiang; Vest, Benjamin; Jha, Pankaj; Atwater, Harry | Here we study photoluminescence of hBN single emitters via variable temperature (4K-300K) spectroscopy and compare exfoliated, chemically vapor deposition (CVD) grown and bulk hBN crystals. | Session 26: Materials for Quantum Information Science – 3 (Novel Materials Systems) |

405 | Exploring radiative properties of quantum emitters in boron nitride with excited state calculations and Bayesian analysis | Gao, Shiyuan; Chen, Hsiao-Yi; Bernardi, Marco | Our work advances the microscopic understanding of hBN single-photon emitters and introduces a computational framework to systematically investigate quantum emitters in 2D materials. | Session 26: Materials for Quantum Information Science – 3 (Novel Materials Systems) |

406 | First-principles characterization of the nitrogen vacancy center in 4H-SiC | Zhu, Yizhi; Kovos, Berk; Onizhuk, Mykyta; Awschalom, David; Galli, Giulia | We find significant enhancement in T 2 and T 2* for basal defects compared to the axial ones, and we discuss similarities and differences with the corresponding quantities obtained for the divacancy in SiC. | Session 26: Materials for Quantum Information Science – 3 (Novel Materials Systems) |

407 | Room temperature photon statistics of hexagonal boron nitride quantum emitters | Jha, Pankaj; Parazzoli, Claudio; Akbari, Hamidreza; Capron, Barbara; Koltenbah, Benjamin; Atwater, Harry | In this work, we investigate the spectral and intensity fluctuations of emission from hBN color centers triggered by laser pulses. | Session 26: Materials for Quantum Information Science – 3 (Novel Materials Systems) |

408 | First-principles Studies of Strongly Correlated States in Defect Spin Qubits in Diamond | Sheng, Nan; Ma, He; Govoni, Marco; Galli, Giulia | Using a recently developed quantum embedding theory [1], we present first-principles calculations of strongly correlated states of spin defects in diamond [2]. | Session 26: Materials for Quantum Information Science – 3 (Novel Materials Systems) |

409 | First-principles calculations of defect-phonon coupling of a spin-1/2 state from a charged carbon impurity in two-dimensional transition-metal dichalcogenides | Lee, Jun-Ho; Haber, Jonah; Neaton, Jeffrey | Here, we present studies of a novel point defect, a negatively-charged carbon impurity substituting for a chalcogen atom, in transition-metal dichalcogenides (TMDs) monolayers that has been recently realized experimentally [arXiv:2008.12196] and can be generated deliberately with atomic precision. | Session 26: Materials for Quantum Information Science – 3 (Novel Materials Systems) |

410 | Deterministic Positioning of Defect Based Qubits using Ion Beam Implantation for Nanofabrication and Modification | Bielejec, Edward | We will present our results on ion beam implantation for nanofabricate and modifications down to single atom devices via direct write nanofabrication at Sandia National Laboratories’ Ion Beam Laboratory. | Session 27: Materials for Quantum Information Science-1 (Materials Engineering) |

411 | Defect Engineering Enables Site-Controlled Single-Photon Generation in Monolayer WSe2 up to 150 K | Parto, Kamyar; Banerjee, Kaustav; Moody, Galan | This work demonstrates a novel method of designing site-specific single-photon emitters in atomically thin WSe 2 with near-unity yield utilizing independent and simultaneous strain engineering via nanoscale stressors and defect engineering via electron-beam irradiation. | Session 27: Materials for Quantum Information Science-1 (Materials Engineering) |

412 | Laser writing with a solid immersion lens: towards optically coherent nitrogen-vacancy centers in microstructured diamond | Yurgens, Viktoria; Zuber, Josh; Flågan, Sigurd; De Luca, Marta; Shields, Brendan; Jakubczyk, Tomasz; Zardo, Ilaria; Maletinsky, Patrick; Warburton, Richard | We present NV arrays that have been created between 1 and 40 µm from a diamond surface, presenting optical linewidth distributions with means as low as 61.0 MHz, including spectral diffusion induced by off-resonant repump. | Session 27: Materials for Quantum Information Science-1 (Materials Engineering) |

413 | Optical properties of plasmonic metasurface with sub-nm gaps – Extremely large third-order nonlinear optical effects caused by electron transports – | Takeuchi, Takashi; Yabana, Kazuhiro | To take into account quantum mechanical effects, we employ time-dependent density functional theory(TDDFT) treating the constituent nano-particles by a jellium model. | Session 27: Materials for Quantum Information Science-1 (Materials Engineering) |

414 | Simulating STM Images for Atomic Precision Dopant Placement in Si | Wyrick, Jonathan; Wang, Xiqiao; Kashid, Ranjit; Namboodiri, Pradeep; Fei, Fan; Silver, Richard | We detail density functional theory calculations which simulate scanning tunneling microscopy (STM) images and enable in situ determination of species adsorbed at planned P adsites. | Session 27: Materials for Quantum Information Science-1 (Materials Engineering) |

415 | Electric-Field Control of Strain-Driven Tuning of FMR in the Low-Loss Ferrimagnetic Coordination Compound V[TCNE]x | Kurfman, Seth; Franson, Andrew; Shah, Piyush; Shi, Yueguang; Flatté, Michael; Srinivasan, Gopalan; Page, Michael; Johnston-Halperin, Ezekiel | To date, this work has exploited low-loss ferrite materials mechanically coupled to piezoelectric substrates. | Session 27: Materials for Quantum Information Science-1 (Materials Engineering) |

416 | Probing the Structure of V[TCNE]x via Electron Energy Loss Spectroscopy | Trout, Amanda; Kurfman, Seth; Chilcote, Michael; Johnston-Halperin, Ezekiel; McComb, David | We present scanning transmission electron microscopy (STEM) electron energy loss spectroscopy (EELS) of V[TCNE] x films using a vacuum transfer holder. | Session 27: Materials for Quantum Information Science-1 (Materials Engineering) |

417 | An in-situ single photon source detection platform for deterministic nanometer resolution ion implantation | Titze, Michael; Chandrasekaran, Vigneshwaran; Htoon, Han; Bielejec, Edward | We developed a platform for focused ion beam (FIB) implantation that allows control of positioning to <50 nm and implantation down to single impurity atoms using counted ion implantation. | Session 27: Materials for Quantum Information Science-1 (Materials Engineering) |

418 | Single crystal diamond membranes for quantum networking and sensing | Guo, Xinghan; Delegan, Nazar; Li, Zixi; Liu, Tianle; Butcher, Amy; Awschalom, David; Joseph, F.; High, Alexander | Herein we will present the fabrication steps in detail, including He + implantation, CVD overgrowth, membrane undercut and transfer, backside etching, and additional patterning. | Session 27: Materials for Quantum Information Science-1 (Materials Engineering) |

419 | High-Q Nanophotonic Resonators on Diamond Membranes using Atomic Layer Deposition TiO2 | Butcher, Amy; Guo, Xinghan; Shreiner, Robert; Delegan, Nazar; Hao, Kai; Duda, III, Peter; Awschalom, David; Joseph, F.; High, Alexander | In this work, we fabricated ring resonators and 1D photonic crystal cavities (PhCCs) with quality factors exceeding 10^4 and integrated high-Q PhCCs with diamond membranes. | Session 27: Materials for Quantum Information Science-1 (Materials Engineering) |

420 | First-principles study of negatively charged nitrogen vacancy and silicon vacancy in diamond in strained environments | Huang, Benchen; Ma, He; Jin, Yu; Hsieh, Satcher; Bhattacharyya, Prabudhya; Zu, Chong; Kobrin, Bryce; Yao, Norman; Galli, Giulia | First-principles study of negatively charged nitrogen vacancy and silicon vacancy in diamond in strained environments | Session 27: Materials for Quantum Information Science-1 (Materials Engineering) |

421 | Molecular pathways and thermal stabilities of vacancy-complex formation in silicon carbide | Lee, Elizabeth; Yu, Alvin; De Pablo, Juan; Galli, Giulia | Here we investigate the dynamics of several vacancy defects in SiC using molecular dynamics simulations. | Session 27: Materials for Quantum Information Science-1 (Materials Engineering) |

422 | New material platform for superconducting transmon qubits with coherence times exceeding 0.3 milliseconds | Houck, Andrew | We will present a materials-based approach to reliably reproduce long coherence times by using tantalum-based devices, and present detailed characterization of devices to understand remaining sources of decoherence. | Session 28: Materials for Quantum Information Science-2 (Superconducting and Semiconducting Materials) |

423 | A density-functional theory study of the Al/AlOx/Al tunnel junction | Kim, Changeun; Ray, Keith; Lordi, Vincenzo | Our ab-initio atomistic analysis presents an approach to predict the performance of superconducting quantum tunnel junction and assess novel materials. | Session 28: Materials for Quantum Information Science-2 (Superconducting and Semiconducting Materials) |

424 | Cooperative Photon Emission from Indistinguishable Quantum Dots in Free Space | Koong, ZheXian; Scerri, Eleanor; Santana, Ted; Cygorek, Moritz; Ma, Yong; Park, Suk-In; Song, Jin Dong; Gauger, Erik; Gerardot, Brian | By measuring photon correlations with Hanbury-Brown and Twiss and Hong-Ou-Mandel interferometers, we fully map the quantum optical signatures of super-radiant photon emission for resonant driving and incoherent pumping as a function of detuning. | Session 28: Materials for Quantum Information Science-2 (Superconducting and Semiconducting Materials) |

425 | Traveling Wave Parametric Amplification without Dispersion Engineering | Kow, Chung; Brown, Tristan; Podolskiy, Viktor; Kamal, Archana | Here we propose a new system that can realize large broadband gain without employing any dispersion engineering. | |

426 | Robust Performance of Superconducting Nanowire Single Photon Detectors under High Magnetic Fields | Marvinney, Claire; Pai, Yun-Yi; Lerner, Brian; Feldman, Matthew; Zhang, Jie; Miller, Aaron; Lawrie, Benjamin | Here, we explore the magnetic field dependence of amorphous SNSPDs, determining they are robust up to ±6T with a negligible dark count rate and unchanged quantum efficiency at operation bias currents. | |

427 | Control of spin relaxation in GaAs nanowires with electric bias and nanowires aspect ratio | You, ChanJu (Zoe); Castelletto, Stefania; Isakovic, Abdel F. | We modeled these spectra using a modified spectral response function, and we propose this secondary peak appears due to a transition between two modes of spin transport within nanowires. | |

428 | Modulation Doping of Template-Defined InGaAs Nanowires | Cerveny, Kristopher; Friedl, Martin; Samani, Mohammad; Dede, Didem; Huang, Chunyi; Lauhon, Lincoln; Zumbuhl, Dominik; Fontcuberta i Morral, Anna | Here, we report recent results on InGaAs nanowires with remote doping in the GaAs nanomembrane template grown via molecular beam epitaxy in a selective area growth approach [2]. | |

429 | The impact of using palladium gates for silicon quantum dot fabrication: defect densities and strain | Stein, Ryan; Stewart, Michael | Here, we present measurements of oxide defect densities (fixed charge and interface trap density) as a function of forming gas anneal temperature for three different gate metals: Al, Ti/Pd, and Ti/Pt. | |

430 | Creation of dark exciton states in a semiconductor quantum dot by a light field with a strong longitudinal component | Quinteiro, Guillermo; Reiter, Doris; Holtkemper, Matthias; Kuhn, Tilmann | Here we predict the formation of ground-state dark excitons in QDs excited by light having a strong longitudinal component, e. g. a radially polarized beam. | |

431 | Closing the loop on valley splitting in 28Si/SiGe: atom probe tomography, tightbinding, and cryomultiplexing | Paquelet Wuetz, Brian; Losert, Merritt; Koelling, Sebastian; Zwerver, Anne-Marije; Stehouwer, Lucas; Samkharadze, Nodar; Philips, Stephan; Madzik, Mateusz; Zheng, Guoji; Xue, Xiao; Amitonov, Sergei; Lodari, Mario; Sammak, Amir; Coppersmith, Susan; Vandersypen, Lieven; Moutanabbir, Oussama; Friesen, Mark; Scappucci, Giordano | Here we study 28Si/SiGe heterostructures with varying roughness of the critical Si/SiGe interfaces to understand the energy splitting of the lowest lying conduction valleys (valley splitting). | |

432 | Gate-defined quantum dots in monolayer and bilayer WSe2: Part I, Fabrication | Stacy, Jeb; Davari Dolatabadi, Shiva; Mercado, Alejandro; Tull, Jeremy; Basnet, Rabindra; Pandey, Krishna; Nabi, Md Rafique Un; Watanabe, Kenji; Taniguchi, Takashi; Hu, Jin; Churchill, Hugh | In this presentation, we discuss design considerations and implementations for the fabrication of ~100 nm diameter gate-defined, p-type quantum dots in monolayer and bilayer WSe 2. | |

433 | Gate-defined quantum dots in monolayer and bilayer WSe2: Part II, Measurement | Davari Dolatabadi, Shiva; Stacy, Jeb; Mercado, Alejandro; Tull, Jeremy; Basnet, Rabindra; Pandey, Krishna; Nabi, Md Rafique Un; Watanabe, Kenji; Taniguchi, Takashi; Hu, Jin; Churchill, Hugh | We have observed the Coulomb blockade effects at temperatures as low as 30 mK in our p-type quantum dots where we were able to estimate the gate-tunable size of the quantum dot. | |

434 | Improvement in Superconducting Resonator Quality Factor Through Surface Passivation | Berk, Cassidy; Banerjee, Archan; HAJR, AHMED; Kreikebaum, John Mark; Altoe, Virginia; Santiago, David; Ogletree, D. Frank; Siddiqi, Irfan | In this study, we characterize the effect of these loss mechanisms for Nb co-planar resonators with and without a TiN capping layer by correlating materials analysis (XPS,TEM) and low temperature electrical measurements. | |

435 | Sub-wavelength addressing of superconducting qubits in a rectangular waveguide | Albert, Romain; Rosenthal, Eric; Zanner, Maximilian; Casulleras, Silvia; Juan, Mathieu L.; Lehnert, Konrad; Romero-Isart, Oriol; Kirchmair, Gerhard | We experimentally demonstrate this control using transmon qubits embedded in a rectangular waveguide. | Session 29: Multi-Mode and 3D Cavity Circuit QED Systems |

436 | State preparation and tomography in 3D multimode circuit QED | He, Kevin; Chakram, Srivatsan; Dixit, Akash; Oriani, Andrew; Naik, Ravi; Leung, Nelson; Kwon, Hyeokshin; Banerjee, Riju; Ma, Wen-Long; Jiang, Liang; Schuster, David | We present ways to take advantage of the nonlinearity of a single transmon circuit for universal control of all the cavity modes. | Session 29: Multi-Mode and 3D Cavity Circuit QED Systems |

437 | Multiplexed stabilization of cat qubits | Hann, Connor; Arrangoiz-Arriola, Patricio; Noh, Kyungjoo; Safavi-Naeini, Amir; Jiang, Liang; Brandao, Fernando | In this talk, I will show how multiple cat qubits can be simultaneously stabilized by a single, shared nonlinear element, enabling increased connectivity and hardware efficiency. | Session 29: Multi-Mode and 3D Cavity Circuit QED Systems |

438 | Quantum error correction of a qubit encoded in grid states of an oscillator | Campagne-Ibarcq, Phillipe; Eickbusch, Alec; Touzard, Steven; Siegele, Christian; Zalys-Geller, Evan; Frattini, Nicholas; Sivak, Volodymyr; Reinhold, Philip; Puri, Shruti; Shankar, Shyam; Schoelkopf, Robert; Frunzio, Luigi; Mirrahimi, Mazyar; Devoret, Michel | In this talk, I will review the fascinating properties of the GKP code and the conceptual and experimental tools developed for trapped ions and superconducting circuits, which enabled quantum error correction of a logical GKP qubit encoded in a microwave cavity. | Session 29: Multi-Mode and 3D Cavity Circuit QED Systems |

439 | Multilayer Microwave Integrated Quantum Circuits: Part 1 | Lei, Chan U; Krayzman, Lev; Ganjam, Suhas; Frunzio, Luigi; Schoelkopf, Robert | In this talk, we will present an overview of the MMIQC architecture and the ability to realize modular quantum networks. | Session 29: Multi-Mode and 3D Cavity Circuit QED Systems |

440 | Multilayer Microwave Integrated Quantum Circuits: Part 2 | Krayzman, Lev; Lei, Chan U; Ganjam, Suhas; Frunzio, Luigi; Schoelkopf, Robert | In this talk, we will present an indium bump-bonding approach to produce superconducting seams with RF conductance exceeding 10^10/Ohm/m. | Session 29: Multi-Mode and 3D Cavity Circuit QED Systems |

441 | Multilayer Microwave Integrated Quantum Circuits: Part 3 | Ganjam, Suhas; Lei, Chan U; Krayzman, Lev; Frunzio, Luigi; Schoelkopf, Robert | In this talk, we will demonstrate on-chip microwave resonating cavities with quality factors exceeding 300 million and describe their power and temperature dependence. | Session 29: Multi-Mode and 3D Cavity Circuit QED Systems |

442 | Symmetry-engineered collective dark state in an open quantum system | Zanner, Maximilian; Orell, Tuure; Albert, Romain; Schneider, Christian; Oleschko, Stefan; Juan, Mathieu; Silveri, Matti; Kirchmair, Gerhard | We show that the decay of the four qubit entangled dark state is strongly suppressed, exceeding the waveguide-limited lifetimes of individual qubits by two orders of magnitude (1/Γ DS = 200/Γ 1). | Session 29: Multi-Mode and 3D Cavity Circuit QED Systems |

443 | Relative Lifetimes of Quantum Information Encoded in Various Quantum Memories | Otten, Matthew; Kapoor, Keshav; Ozguler, A. Baris; Holland, Eric; Kowalkowski, James; Alexeev, Yuri; Lyon, Adam | We study the correlation of the structure of quantum information with physical noise models of a variety of possible quantum memory implementations, such as superconducting 2D qubits and 3D Superconducting Radio Frequency(SRF) cavities. | Session 29: Multi-Mode and 3D Cavity Circuit QED Systems |

444 | Engineering tunable interactions via parametric flux modulation in 3D – Part II | Maiti, Aniket; Lu, Yao; Ganjam, Suhas; Zhang, Yaxing; Frunzio, Luigi; Girvin, Steven; Schoelkopf, Robert | In this talk, we present the experimental implementation of a novel design that allows efficient delivery of both AC flux and DC flux into a 3D package, without driving the charge degree of freedom. | Session 29: Multi-Mode and 3D Cavity Circuit QED Systems |

445 | Advancements in superconducting cavities for 3D CQED systems | Oriani, Andrew; Chakram, Srivatsan; He, Kevin; Anferov, Alexander; Dixit, Akash; Schuster, David | In this talk we will discuss the adaptation of niobium superconducting RF accelerator cavity processes to cavity designs common to CQED research. | Session 29: Multi-Mode and 3D Cavity Circuit QED Systems |

446 | Bosonic superradiance and subradiance in an array of superconducting transmon devices | Orell, Tuure; Zanner, Maximilian; Sharafiev, Aleksei; Oleschko, Stefan; Juan, Mathieu L.; Albert, Romain; Kirchmair, Gerhard; Silveri, Matti | Bosonic superradiance and subradiance in an array of superconducting transmon devices | Session 29: Multi-Mode and 3D Cavity Circuit QED Systems |

447 | Engineering tunable interactions via parametric flux modulation in 3D – Part I | Lu, Yao; Maiti, Aniket; Ganjam, Suhas; Zhang, Yaxing; Frunzio, Luigi; Girvin, Steven; Schoelkopf, Robert | Here we propose a novel design that allows such an efficient delivery of ac flux into a 3D superconducting package without driving the charge degree of freedom, while preserving the coherence properties of the device. | Session 29: Multi-Mode and 3D Cavity Circuit QED Systems |

448 | Bath-engineering qubit systems with 3-wave mixing | Mucci, Maria; Cao, Xi; Smitham, Basil; S. Chiu, Christie; Houck, Andrew; Hatridge, Michael | In this talk we extend this idea to qubits by coupling a low-Q mode containing a SNAIL (Superconducting Nonlinear Asymmetric Inductive eLement) to a high-Q transmon. | Session 29: Multi-Mode and 3D Cavity Circuit QED Systems |

449 | Integrating a nonreciprocal amplifier with a 3D transmon qubit | Miller, Benton; Lecocq, Florent; Hauer, Bradley; Cicak, Katarina; Simmonds, Raymond; Teufel, John; Aumentado, Jose | We will focus on the delicate balance between large gain and low backaction and between fast readout and long qubit lifetime. | Session 29: Multi-Mode and 3D Cavity Circuit QED Systems |

450 | Fault-tolerant error syndrome detection in the GKP code | Siegele, Christian; Mirrahimi, Mazyar; Campagne-Ibarcq, Phillipe | We present a novel error correction scheme in which logical errors induced by ancilla noise are suppressed, realizing a fault-tolerant error syndrome detection. | Session 29: Multi-Mode and 3D Cavity Circuit QED Systems |

451 | Symmetries of bosonic codes | Grimsmo, Arne | In this talk I will discuss how the symmetries dictate which logical operations are fault tolerant, and some of the pros and cons of rotation symmetric vs. translation symmetric codes for scalable, fault-tolerant quantum computing. | Session 29: Multi-Mode and 3D Cavity Circuit QED Systems |

452 | High fidelity interactions between cavities, part 1 | de Graaf, Stijn; Chapman, Benjamin; Zhang, Yaxing; Mundhada, Shantanu; Frunzio, Luigi; Girvin, Steven; Schoelkopf, Robert | Here, I will talk about the expected performance of such a device, and how we solve these engineering challenges. | Session 29: Multi-Mode and 3D Cavity Circuit QED Systems |

453 | Mediating high-fidelity interactions between superconducting microwave cavities, part II. | Chapman, Benjamin; de Graaf, Stijn; Zhang, Yaxing; Mundhada, Shantanu; Frunzio, Luigi; Girvin, Steven; Schoelkopf, Robert | In this talk, we discuss preliminary measurements on pairs of three-dimensional microwave cavities coupled by such a custom conversion element. | Session 29: Multi-Mode and 3D Cavity Circuit QED Systems |

454 | Superstrong coupling between a transmon and a metamaterial resonator | Indrajeet, Sagar; McBroom, Tianna; Cole, Bradley; Plourde, Britton | We report on our progress with implementing metamaterial devices with enhanced qubit coupling. | Session 29: Multi-Mode and 3D Cavity Circuit QED Systems |

455 | Many-body states of radiation and quantum thermalization in multi-mode circuit QED (Part 1) | Mehta, Nitish; Kuzmin, Roman; Ciuti, Cristiano; Manucharyan, Vladimir | We explore a quantum impurity problem arising from the galvanic coupling of a superconducting fluxonium qubit to a long section of a 1D waveguide. | Session 29: Multi-Mode and 3D Cavity Circuit QED Systems |

456 | Many-body states of radiation and quantum thermalization in multi-mode circuit QED (Part 2) | Mehta, Nitish; Kuzmin, Roman; Ciuti, Cristiano; Manucharyan, Vladimir | We explore a quantum impurity problem arising from the galvanic coupling of a superconducting fluxonium qubit to a long section of a 1D waveguide. | Session 29: Multi-Mode and 3D Cavity Circuit QED Systems |

457 | Long range connectivity in a scalable superconducting qubit network | Hazra, Sumeru; Bhattacharjee, Anirban; Chand, Madhavi; Salunkhe, Kishor; Gopalakrishnan, Sriram; Patankar, Meghan; Vijay, R | We theoretically analyse the relative inter-qubit coupling strength and experimentally verify it in a device capable of supporting up to twelve qubits where each qubit can be connected to nine other qubits. | Session 29: Multi-Mode and 3D Cavity Circuit QED Systems |

458 | Chiral cavity quantum electrodynamics in a 3D microwave lattice coupled to a transmon qubit (Part 1) | Panetta, Margaret; Owens, Clai; Chakram, Srivatsan; Saxberg, Brendan; Roberts, Gabrielle; Ma, Ruichao; Vrajitoarea, Andrei; Simon, Jon; Schuster, David | Here we discuss the design and testing of this system and describe prospects for its application. | Session 29: Multi-Mode and 3D Cavity Circuit QED Systems |

459 | Chiral cavity quantum electrodynamics in a 3D microwave lattice coupled to a transmon qubit (Part 2) | Owens, Clai; Panetta, Margaret; Chakram, Srivatsan; Saxberg, Brendan; Roberts, Gabrielle; Ma, Ruichao; Vrajitoarea, Andrei; Simon, Jon; Schuster, David | We describe work combining a single transmon with this topological lattice, achieving, for the first time, a platform for chiral cavity quantum electrodynamics. | Session 29: Multi-Mode and 3D Cavity Circuit QED Systems |

460 | Manipulating complex hybrid entanglement and testing multipartite Bell inequalities in a superconducting circuit | Pan, Xiaoxuan; Ma, Yuwei; Cai, Weizhou; Mu, Xianghao; Xu, Yuan; Hu, Ling; Wang, Weiting; Wang, Haiyan; Song, Yipu; yang, zhen-biao; Zheng, Shi-Biao; Sun, Luyan | We reveal the quantum correlations among these distinct elements by joint Wigner tomography of the two cavity fields conditional on the detection of the qubits and by test of a five-partite Bell inequality. | Session 29: Multi-Mode and 3D Cavity Circuit QED Systems |

461 | Algorithmic Error Mitigation Scheme for Current Quantum Processors | Suchsland, Philippe; Tacchino, Francesco; Fischer, Mark; Neupert, Titus; Barkoutsos, Panagiotis; Tavernelli, Ivano | We present a hardware agnostic error mitigation algorithm for near term quantum processors inspired by the classical Lanczos diagonalization method. | Session 30: Noise Reduction and Error Mitigation in Quantum Computing |

462 | Mitigating realistic noise in practical noisy intermediate-scale quantum devices | Endo, Suguru; sun, jinzhao; Tsunoda, Takahiro; Vedral, Vlatko; Benjamin, Simon; Yuan, Xiao | For noise from imperfections of the engineered Hamiltonian or additional noise operators, we show it can be effectively suppressed by a novel stochastic QEM method. | Session 30: Noise Reduction and Error Mitigation in Quantum Computing |

463 | Improved quasiprobabilistic quantum error mitigation | Piveteau, Christophe; Sutter, David; Woerner, Stefan | In this work, we present two novel approaches to reduce the exponential basis of that overhead. | Session 30: Noise Reduction and Error Mitigation in Quantum Computing |

464 | Scalable Quantum Computing on a Noisy Superconducting Quantum Processor via Randomized Compiling | Hashim, Akel; Naik, Ravi; Morvan, Alexis; Ville, Jean-Loup; Mitchell, Brad; Kreikebaum, John Mark; Davis, Marc; Smith, Ethan; Iancu, Costin; O’Brien, Kevin; Hincks, Ian; Wallman, Joel; Emerson, Joseph; Santiago, David; Siddiqi, Irfan | In this work, we demonstrate significant performance gains under randomized compiling for both the four-qubit quantum Fourier transform algorithm and for random circuits of variable depth on a superconducting quantum processor. | Session 30: Noise Reduction and Error Mitigation in Quantum Computing |

465 | Error mitigation via verified phase estimation | O’Brien, Thomas; Polla, Stefano; Rubin, Nicholas; Huggins, William; McArdle, Sam; Boixo, Sergio; McClean, Jarrod; Babbush, Ryan | This paper presents a new error mitigation technique based on quantum phase estimation that can also reduce errors in expectation value estimation (e.g., for variational algorithms). | Session 30: Noise Reduction and Error Mitigation in Quantum Computing |

466 | Leveraging Randomized Compiling for the QITE Algorithm | Ville, Jean-Loup; Morvan, Alexis; Hashim, Akel; Naik, Ravi; Mitchell, Brad; Kreikebaum, John Mark; O’Brien, Kevin; Davis, Marc; Smith, Ethan; Younis, Ed; Iancu, Costin; Hincks, Ian; Wallman, Joel; Emerson, Joseph; Santiago, David; Siddiqi, Irfan | In this work, we implement a new noise-mitigation technique, taking advantage of the noise tailoring property of randomized compiling, and then compensating for the stochastic noise. | Session 30: Noise Reduction and Error Mitigation in Quantum Computing |

467 | Simulating the Fermi-Hubbard model on Google’s superconducting quantum processor | Jiang, Zhang; Smelyanskiy, Vadim | To minimize systematic errors, we introduce an accurate gate calibration procedure that is fast enough to capture temporal drifts of the gate parameters. | Session 30: Noise Reduction and Error Mitigation in Quantum Computing |

468 | Error mitigating NISQ chemistry computations | Rubin, Nicholas | Most importantly we describe methods for going beyond this circuit primitive for more correlated model chemistry. | Session 30: Noise Reduction and Error Mitigation in Quantum Computing |

469 | Quantum-assisted NMR Inference on Noisy Rydberg Atom Devices | Chattopadhyay, Sambuddha; Sels, Dries; Demler, Eugene | Specifically, we construct an experimentally realistic error model for Rydberg atoms and use it to optimize protocols which balance hardware error with Trotterization error to achieve high-fidelity Hamiltonian simulation for spectral computation. | Session 30: Noise Reduction and Error Mitigation in Quantum Computing |

470 | Effectiveness of error-mitigation techniques for VQE under realistic noise sources | Solís, José; Aguilar, Armando; Batista, Russell; Gonzalez, Roberto; Gutierrez, Mauricio | We perform full density-matrix simulations of the VQE algorithm to estimate the electronic ground state energies of small molecules and study the effectiveness of various error mitigation techniques to reduce the deleterious impact of different realistic noise sources. | Session 30: Noise Reduction and Error Mitigation in Quantum Computing |

471 | Error Mitigation Via Emulated Measurement of Stabilizers | Greene, Amy; Kjaergaard, Morten; Samach, Gabriel; Schwartz, Mollie; Bengtsson, Andreas; McNally, Chris; O’Keeffe, Michael; Kim, David; Marvian, Milad; Melville, Alexander; Niedzielski, Bethany; Vepsalainen, Antti; Winik, Roni; Yoder, Jonilyn; Rosenberg, Danna; Lloyd, Seth; Orlando, Terry; Marvian, Iman; Gustavsson, Simon; Oliver, William | We demonstrate the error-mitigating effects of this emulated quantum measurement protocol on a small superconducting qubit processor. | Session 30: Noise Reduction and Error Mitigation in Quantum Computing |

472 | Measurement Error Mitigation for Variational Quantum Algorithms | Barron, George; Wood, Christopher | Recent work introduced a technique for mitigating expectation values against correlated measurement errors that can be applied to measurements of 10s of qubits. | Session 30: Noise Reduction and Error Mitigation in Quantum Computing |

473 | Noise reconstruction in quantum hardware via convex optimization | Li, Li; Slatyer, Harry; Ball, Harrison; Hush, Michael; Biercuk, Michael; Milne, Alistair; Hempel, Cornelius; Edmunds, Claire | We introduce a novel machine-learning technique allowing the efficient, flexible, and quantitatively accurate reconstruction of a noise process’s frequency-resolved power spectral density. | Session 30: Noise Reduction and Error Mitigation in Quantum Computing |

474 | Error-divisible two-qubit quantum gates | Rodriguez Perez, David; Roy, Tanay; Li, Ziqian; Schuster, David; Kapit, Eliot | The techniques presented in this work using an error-divisible implementation of a two-qubit gate achieve an eight-fold reduction in final gate error for a CPHASE(π/4) operation compared to a stock gate set implementation using CZ gates. | Session 30: Noise Reduction and Error Mitigation in Quantum Computing |

475 | Methods and benchmarks for error mitigation on noisy quantum computers | LaRose, Ryan; Giurgica-Tiron, Tudor; Hindy, Yousef; Mari, Andrea; Karalekas, Peter; Shammah, Nathan; Zeng, William | In this presentation, we discuss contributions to the theory of error mitigation [1], show benchmark results on noisy quantum computers [1-2], and introduce our software package, Mitiq, for error mitigation [2]. | Session 30: Noise Reduction and Error Mitigation in Quantum Computing |

476 | Diagnosing Errors in Qubit Gates Using Continuous Measurements (Theory) | Steinmetz, John; Das, Debmalya; Koolstra, Gerwin; Stevenson, Noah; Siva, Karthik; Livingston, William; Naik, Ravi; Santiago, David; Siddiqi, Irfan; Jordan, Andrew | We propose a method of characterizing systematic, time-dependent errors in single- and two-qubit gates using continuous weak measurements. | Session 30: Noise Reduction and Error Mitigation in Quantum Computing |

477 | Error Mitigation with Artificial Symmetries | Huggins, William; McArdle, Sam; O’Brien, Thomas; Lee, Joonho; Rubin, Nicholas; Whaley, Birgitta; Babbush, Ryan; McClean, Jarrod | We present an error mitigation technique that reduces the error in the estimation of expectation values by introducing artificial symmetries more amenable to NISQ devices than traditional quantum error correcting codes. | Session 30: Noise Reduction and Error Mitigation in Quantum Computing |

478 | Pulse optimization for error-robust control on cloud-based superconducting hardware | Carvalho, Andre; Ball, Harrison; Biercuk, Michael; Hush, Michael; Thompsen, Felix | We describe an experimental effort designing and deploying error-robust single-qubit operations on IBM Quantum hardware. | Session 30: Noise Reduction and Error Mitigation in Quantum Computing |

479 | Gate error models for superconducting qubit architectures | Underwood, Devin; Stehlik, Jiri; Phung, Timothy; Zajac, David; Raftery, James; Kumph, Muir | We will present experimentally motivated gate error models that provide insight on how noise from system hardware gives rise to gate errors for these two control types. | Session 30: Noise Reduction and Error Mitigation in Quantum Computing |

480 | Noise-Aware Error Rate Reduction of Single-Qubit Gates | Maldonado, Thomas; Galda, Alexey; Flick, Johannes; Krastanov, Stefan; Narang, Prineha | In this work, we introduce a protocol by which knowledge of the initial quantum state (e.g., after qubit initialization) and standard parameters describing the system’s noise can be leveraged to reduce the noise present during the execution of a single-qubit gate. | Session 30: Noise Reduction and Error Mitigation in Quantum Computing |

481 | Designing single-qubit gates for a silicon three-qubit device with always-on exchange coupling | Wolin, Sidney; Kanaar, David; Güngördü, Utkan; Kestner, Jason | We apply similar techniques, after a Schreiffer-Wolff transformation and rotating wave approximation, to decompose a coupled three-qubit system (formed in a triple quantum dot) into independent subalgebras. | Session 30: Noise Reduction and Error Mitigation in Quantum Computing |

482 | Diagnosing Gate Errors in Superconducting Qubits Using Continuous Measurements (Experiment) | Koolstra, Gerwin; Stevenson, Noah; Siva, Karthik; Livingston, William; Naik, Ravi; Steinmetz, John; Das, Debmalya; Jordan, Andrew; Santiago, David; Siddiqi, Irfan | In this work, we use continuous measurement of a superconducting qubit to continuously track the qubit state during a gate, and reconstruct the magnitude and type of error from measured voltage records. | Session 30: Noise Reduction and Error Mitigation in Quantum Computing |

483 | Optimized Single Qubit Gates via Filter Function Design | Oda, Yasuo; Lucarelli, Dennis; Schultz, Kevin; Clader, David; Quiroz, Greg | Here, we discuss a protocol that optimizes control sequences to combat temporally correlated noise, a class of noise that is known to be particularly detrimental to quantum error correction. | Session 30: Noise Reduction and Error Mitigation in Quantum Computing |

484 | Nonlinear Signal Distortion Corrections Through Quantum Sensing. | Chaves, Kevin | We present work that demonstrates how a transmon qubit can be used as a highly sensitive cryogenic detector to characterize these nonlinear amplitude distortions. | Session 30: Noise Reduction and Error Mitigation in Quantum Computing |

485 | Reducing spectator errors in cross resonance gates | Pritchett, Emily | We show how to mitigate known unitary errors contributing to the the cross-resonance gate — higher order effects of ZZ interaction and spectator entanglement — with the addition of resonant, target rotary pulses. | Session 30: Noise Reduction and Error Mitigation in Quantum Computing |

486 | Robust quantum gates using smooth pulses and physics-informed neural networks | Güngördü, Utkan; Tahan, Charles; Kestner, Jason | Here, we present a widely applicable method for obtaining robust smooth pulses which is not based on a sampling approach and does not need any assumptions with regards to the underlying statistics of the experimental noise for both quasistatic and broadband noise. | Session 30: Noise Reduction and Error Mitigation in Quantum Computing |

487 | Generalized Markovian Noise as a Resource for Suppressing Markovian Errors in Superconducting Qubits: Part II (Experiment) | Zhang, Haimeng; Vlachos, Evangelos; Marshall, Jeffrey; Albash, Tameem; Levenson-Falk, Eli | Theory predicts that by injecting classical non-Markovian noise, the qubit dephasing time can be extended. | Session 30: Noise Reduction and Error Mitigation in Quantum Computing |

488 | Characterization of Time-Correlated Semiclassical Control Noise of IBM Transmon Qubits | Barr, Robert; Trout, Colin; Oda, Yasuo; Quiroz, Greg; Schultz, Kevin; Titum, Paraj; Norris, Leigh; Viola, Lorenza; Clader, David | In this work, we apply provably optimal narrowband quantum control sequences to probe fine spectral features of both native and injected control noise on IBM’s transmon-based qubits using the OpenPulse framework. | Session 30: Noise Reduction and Error Mitigation in Quantum Computing |

489 | A Josephson traveling wave parametric amplifier featuring superconducting nonlinear asymmetric inductive elements. | Vesterinen, Visa; Datta, Debopam; Tiencken, Nils; Simbierowicz, Slawomir; Najafi Jabdaraghi, Robab; Grönberg, Leif; Lehtinen, Janne; Prunnila, Mika; Govenius, Joonas | We present our latest experimental results on Josephson traveling wave parametric amplifiers (TWPAs) fabricated with our Nb/Al-AlOx/Nb junction process [1,2] tailored for the readout of superconducting quantum bits. | Session 30: Noise Reduction and Error Mitigation in Quantum Computing |

490 | Modeling and mitigation of realistic readout noise with applications to Quantum Approximate Optimization Algorithm | Maciejewski, Filip; Baccari, Flavio; Zimborás, Zoltán; Oszmaniec, Michal | We introduce a correlated measurement noise model that can be efficiently described and characterized, and which admits noise-mitigation on the level of marginal probability distributions. | Session 30: Noise Reduction and Error Mitigation in Quantum Computing |

491 | Quantum error mitigation in the presence of time-correlated noise | Schultz, Kevin; Quiroz, Gregory; Oda, Yasuo; Mari, Andrea; Shammah, Nathan; Zeng, William; Clader, David | We show that the standard ZNE approach breaks down in the presence of time-correlated noise, and we propose how one could overcome these limitations with alternative extrapolation methods. | Session 30: Noise Reduction and Error Mitigation in Quantum Computing |

492 | Optimized dispersion engineering of coplanar-waveguide-based Josephson traveling-wave parametric amplifiers | Mancini, Corrado; Lolowang, Reinhard; Cairns, Shayne; Schonenberg, Kathy; Carniol, April; Gibson, Gerald; Lokken-Toyli, David | Here we describe JTWPAs co-optimized to support the Hummingbird processor made available by IBM Quantum. | Session 30: Noise Reduction and Error Mitigation in Quantum Computing |

493 | Cheap readout error mitigation on expensive NISQ devices | Budai, Ákos; Zimborás, Zoltán; Pályi, András | In this work, we quantify the efficiency of REM for specific quantum protocols, e.g., quantum state tomography. | Session 30: Noise Reduction and Error Mitigation in Quantum Computing |

494 | Error mitigation with ideal Clifford gates and noisy ancillas | Ciani, Alessandro; Lostaglio, Matteo | Here we explore the potential of quasiprobability-based error mitigation in the context of fault-tolerant quantum computing with perfect Clifford gates and noisy magic states. | Session 30: Noise Reduction and Error Mitigation in Quantum Computing |

495 | Modeling and suppression of noise in transmons: theory and experiment | Tripathi, Vinay; Chen, Huo; Khezri, Mostafa; Yip, Ka Wa; Pokharel, Bibek; Kowalsky, Matthew; Lidar, Daniel | We develop a procedure using dynamical decoupling to separate the errors resulting from crosstalk and demonstrate it through experiments performed on IBM quantum cloud processors. | Session 30: Noise Reduction and Error Mitigation in Quantum Computing |

496 | Generalized Markovian Noise as a Resource for Suppressing Markovian Errors in Superconducting Qubits: Part I (Simulations) | Vlachos, Evangelos; Zhang, Haimeng; Marshall, Jeffrey; Albash, Tameem; Levenson-Falk, Eli | In this talk, we present computational results showing that non-Markovian noise can in fact be used to improve the coherence of a qubit embedded in a purely Markovian noisy background. | Session 30: Noise Reduction and Error Mitigation in Quantum Computing |

497 | Correlated Charge Noise and Bit Flip Errors in Superconducting Qubits | Wilen, Chris; Abdullah, Sohair; Kurinsky, Noah; Cardani, Laura; D’Imperio, Giulia; Faoro, Lara; Ioffe, Lev; Liu, Chuanhong; Opremcak, Alexander; Christensen, Bradley; DuBois, Jonathan; Stanford, Chris; Tomei, Claudia; McDermott, Robert | We have characterized fluctuations in offset charge and temporal variations in energy relaxation time in a circuit comprising four weakly charge-sensitive transmon qubits. | Session 30: Noise Reduction and Error Mitigation in Quantum Computing |

498 | A Cryogenic Variable Temperature Microwave Noise Source | Simbierowicz, Slawomir; Vesterinen, Visa; Milem, Joshua; Lintunen, Aleksi; Oksanen, Mika; Roschier, Leif; Grönberg, Leif; Hassel, Juha; Gunnarsson, David; Lake, Russell | We present a cryogenic microwave noise source with a characteristic impedance of 50 Ω designed to be installed in a coaxial line of a cryostat [1]. | Session 30: Noise Reduction and Error Mitigation in Quantum Computing |

499 | Fast Dissipation-Induced Entanglement In Circuit-QED Using Parametric Interactions | Brown, Tristan; Doucet, Emery; Reiter, Florentin; Simmonds, Raymond; Aumentado, Jose; Noh, Taewan; Govia, Luke; Ristè, Diego; Ribeill, Guilhem; Ranzani, Leonardo; Kamal, Archana | In this talk, I will discuss the experimental realization of a parametrically-induced state stabilization scheme in a circuit-QED architecture, where we use novel state-selective parametric driving to prepare a Bell state as an exact dark state of the dissipative dynamics. | Session 30: Noise Reduction and Error Mitigation in Quantum Computing |

500 | Characterizing and Optimizing Qubit Coherence based on SQUID Geometry | Ding, Leon; Braumueller, Jochen; Vepsalainen, Antti; Sung, Youngkyu; Kjaergaard, Morten; Menke, Tim; Winik, Roni; Kim, David; Niedzielski, Bethany; Melville, Alexander; Yoder, Jonilyn; Hirjibehedin, Cyrus; Orlando, Terry; Gustavsson, Simon; Oliver, William | A previously proposed microscopic model predicts that flux noise increases with the perimeter and decreases with the wire width of the SQUID loop. | Session 30: Noise Reduction and Error Mitigation in Quantum Computing |

501 | Experimental Implementation of Universal Nonadiabatic Geometric Quantum Gates in a Superconducting Circuit | HUA, ZIYUE; Xu, Yuan; Chen, Tao; Pan, Xiaoxuan; Li, Xuegang; Han, Jiaxiu; Cai, Weizhou; Ma, Yuwei; Wang, Haiyan; Song, Yipu; Xue, Zhengyuan; Sun, Luyan | We demonstrate a geometric single-qubit rotation gate set with 0.9977(1) average fidelity and a geometric CZ gate with 0.977(9) fidelity. | Session 30: Noise Reduction and Error Mitigation in Quantum Computing |

502 | The effective central charge of the measurement induced phase transition | Zabalo, Aidan; Gullans, Michael; Wilson, Justin; Vasseur, Romain; Ludwig, Andreas; Gopalakrishnan, Sarang; Pixley, Jed; Huse, David | In this talk, we will introduce a method to calculate the effective central charge of the logarithmic conformal field theory at the critical point. | Session 31: Noisy Intermediate Scale Quantum Computers |

503 | Quantum cellular automata part I: Entanglement, physical complexity, and Goldilocks rules | Hillberry, Logan; Jones, Matthew; Vargas, David; Rall, Patrick; Yunger Halpern, Nicole; Bao, Ning; Notarnicola, Simone; Montangero, Simone; Carr, Lincoln | In this talk we outline our QCA models and complexity analysis results for 1 dimensional systems. | Session 31: Noisy Intermediate Scale Quantum Computers |

504 | Quantum cellular automata part II: Robust complexity under analog and digital evolution in 1- and 2-dimensions | Jones, Matthew; Hillberry, Logan; Jones, Eric; Fasihi, Mina; Kapit, Eliot; Carr, Lincoln; Roushan, Pedram; Jiang, Zhang | We present 2- and 5-qubit gate decompositions of the aforementioned rules, and demonstrate the quantum digital evolution is resilient to depolarizing noise. | Session 31: Noisy Intermediate Scale Quantum Computers |

505 | Rodeo Algorithm for Quantum Computation | Watkins, Jacob | In my talk I will present a new approach to the problem of phase estimation, the Rodeo Algorithm, which can be viewed as a generalization of Kitaev’s original algorithm for QPE. | Session 31: Noisy Intermediate Scale Quantum Computers |

506 | Quantum Computation of Finite-Temperature Static and Dynamical Properties of Spin Systems Using Quantum Imaginary Time Evolution | Sun, Shi-Ning; Motta, Mario; Tazhigulov, Ruslan; Tan, Adrian; Chan, Garnet; Minnich, Austin | Developing scalable quantum algorithms to study finite-temperature physics of quantum many-body systems has attracted considerable interest due to recent advancements in quantum hardware. | Session 31: Noisy Intermediate Scale Quantum Computers |

507 | Quantum Computer Measurements of Phase Shifts Using Wavepacket Edge Time Delays | Gustafson, Erik; Zhu, Yingyue; Dreher, Patrick; Linke, Norbert; Meurice, Yannick | We present a method to extract the phase shifts using a wavepacket edge time delay resulting from a comparison of the real time evolution with and without a potential interaction. | Session 31: Noisy Intermediate Scale Quantum Computers |

508 | Qubit-efficient entanglement spectroscopy using qubit resets | Subasi, Yigit; Yirka, Justin | In this talk I will describe qubit-efficient quantum algorithms for entanglement spectroscopy that exploit the ability to measure and reinitialize subsets of qubits in the course of the computation. | Session 31: Noisy Intermediate Scale Quantum Computers |

509 | Quantum advantage for computations with limited space | Maslov, Dmitri; Kim, Jin-Sung; Bravyi, Sergey; Yoder, Theodore; Sheldon, Sarah | In this work, we theoretically prove and experimentally verify a new type of quantum advantage, where computational space is treated as a limited resource. | Session 31: Noisy Intermediate Scale Quantum Computers |

510 | The power of noisy random quantum circuits | Fefferman, Bill | In this talk, we discuss the computational difficulty of simulating random quantum circuit experiments from two perspectives: first we’ll talk about classical hardness evidence. | Session 31: Noisy Intermediate Scale Quantum Computers |

511 | Quantum error mitigation for fault-tolerant quantum computing | Suzuki, Yasunari; Endo, Suguru; Tokunaga, Yuuki | In this work, we show QEM can compensate dominant errors in FTQC without increasing the number of qubits. | Session 31: Noisy Intermediate Scale Quantum Computers |

512 | Noisy quantum simulators: theory of random perturbations and characterization of robust observables | Poggi, Pablo; Lysne, Nathan; Kuper, Kevin; Deutsch, Ivan; Jessen, Poul | Here, we study the effect of weak random perturbations of various kinds in the performance of a dynamical quantum simulator and establish a framework that links the robustness of the resulting expectation values to the spectral properties of the output observable. | Session 31: Noisy Intermediate Scale Quantum Computers |

513 | Quantum supremacy in driven quantum many-body systems | Tangpanitanon, Jirawat; Thanasilp, Supanut; Lemonde, Marc-Antoine; Dangniam, Ninnat; Angelakis, Dimitris | Here, we show that quantum supremacy can be obtained in generic periodically-driven quantum many-body systems. | Session 31: Noisy Intermediate Scale Quantum Computers |

514 | Neural network decoders on near term trapped-ion logical qubits | Obando Vargas, David; Lopez, Yefry; Gutierrez, Mauricio | Under this framework, we perform simulations of two promising distance-3 quantum error-correcting codes: the surface-17 and the Bacon-Shor codes, implemented on ion-traps with realistic noise sources. | Session 31: Noisy Intermediate Scale Quantum Computers |

515 | Large-Scale Simulation of Quantum Circuits via Tensor Network Contraction | Huang, Cupjin; Zhang, Fang; Newman, Michael; Cai, Junjie; Gao, Xun; Tian, Zhengxiong; Wu, Junyin; Xu, Haihong; Yu, Huanjun; Yuan, Bo; Szegedy, Mario; Shi, Yaoyun; Chen, Jianxin | In this work, we present a parallel tensor network contraction algorithm for quantum circuit simulations. | Session 31: Noisy Intermediate Scale Quantum Computers |

516 | Noise-Induced Barren Plateaus in Variational Quantum Algorithms | Wang, Samson; Fontana, Enrico; Cerezo, Marco; Sharma, Kunal; Sone, Akira; Cincio, Lukasz; Coles, Patrick | In this work, we rigorously prove a serious limitation for noisy VQAs, in that the noise causes the training landscape to have a barren plateau (i.e., vanishing gradient). | Session 31: Noisy Intermediate Scale Quantum Computers |

517 | Absence of Barren Plateaus in Quantum Convolutional Neural Networks | Pesah, Arthur; Cerezo de la Roca, Marco; Wang, Samson; Volkoff, Tyler; Sornborger, Andrew; Coles, Patrick | In this work, we rigorously analyze the gradient scaling for the parameters in the QCNN architecture. | Session 31: Noisy Intermediate Scale Quantum Computers |

518 | Numerical Simulation of Large Scrambling Quantum Circuits | Mandra, Salvatore; Marshall, Jeffrey; Kechedzhi, Kostyantyn | As part of my talk, I will introduce the scrambling circuits used in our simulations and the numerical techniques (both exact and approximate) used to verify and benchmark the Sycamore@Google quantum chip. | Session 31: Noisy Intermediate Scale Quantum Computers |

519 | Fermionic partial tomography via classical shadows | Zhao, Andrew; Rubin, Nicholas; Miyake, Akimasa | We propose a tomographic protocol for estimating any k-body reduced density matrix (k-RDM) of a fermionic state, a ubiquitous step in near-term quantum algorithms for simulating many-body physics, chemistry, and materials. | Session 31: Noisy Intermediate Scale Quantum Computers |

520 | Classical algorithms for quantum mean values | Bravyi, Sergey; Gosset, David; Movassagh, Ramis | In case (c) we give a linear-time algorithm for geometrically local circuits on a two-dimensional grid, which is based on a Monte Carlo method combined with Matrix Product State techniques. | Session 31: Noisy Intermediate Scale Quantum Computers |

521 | Quantum-enhanced analysis of discrete stochastic processes | Blank, Carsten; Park, Kyungdeock; Petruccione, Francesco | We propose a quantum algorithm for calculating the characteristic function of a DSP using the number of quantum circuit elements that grows only linearly with the number of time steps. | Session 31: Noisy Intermediate Scale Quantum Computers |

522 | Simulating Noisy Quantum Circuits with Matrix Product Density Operators | Zeng, Bei | In this work, we simulate random quantum circuits in 1D with Matrix Product Density Operators (MPDO), for different noise models such as dephasing, depolarizing, and amplitude damping. | Session 31: Noisy Intermediate Scale Quantum Computers |

523 | Translation-Invariant Free-Fermion-Solvable Spin Models | Chapman, Adrian; Flammia, Steven; Kollar, Alicia | We give an efficient algorithm for recognizing a free-fermion solution in translation-invariant spin models using graph theory. | Session 31: Noisy Intermediate Scale Quantum Computers |

524 | Identification of Symmetry-Protected Topological States on Noisy Quantum Computers | Azses, Daniel; Haenel, Rafael; Naveh, Yehuda; Raussendorf, Robert; Sela, Eran; Dalla Torre, Emanuele | Here, we propose and realize two complementary protocols to probe these degeneracies based on, respectively, symmetry-resolved entanglement entropies and measurement-based computational algorithms. | Session 31: Noisy Intermediate Scale Quantum Computers |

525 | Computing Partition Functions on Limited Quantum Devices | Jackson, Andrew; Kapourniotis, Theodoros; Datta, Animesh | Computing Partition Functions on Limited Quantum Devices | Session 31: Noisy Intermediate Scale Quantum Computers |

526 | Stochastic simulation of open quantum systems on NISQ Computers | Petruccione, Francesco; Park, Kyungdeock; RHEE, June-Koo(KEVIN); Sinayskiy, Ilya | Regardless of the number of independent quantum trajectories needed in the unravelling, our method uses only a constant number of quantum circuit executions as well as the initial wave function. | Session 31: Noisy Intermediate Scale Quantum Computers |

527 | How efficiently can we simulate the open system dynamics of Ising models? | Mitra, Anupam; Albash, Tameem; Miyake, Akimasa; Deutsch, Ivan | We assume open quantum system dynamics with local decoherence given by a Lindblad master equation, which we solve using quantum trajectories and tensor networks. | Session 31: Noisy Intermediate Scale Quantum Computers |

528 | Building efficient VQE ansatze with complete pools of operators. | Shkolnykov, Vladyslav; Mayhall, Nicholas; Economou, Sophia; Barnes, Edwin | In this talk we discuss the novel adapt-VQE algorithm [1] and show how to build an efficient ansatz for it. | Session 31: Noisy Intermediate Scale Quantum Computers |

529 | Efficient VQE with the perturbation method | Wang, Qingfeng; Li, Ming; Monroe, Christopher; Nam, Yunseong | In this talk, we present a perturbation-based method, namely, hybrid second-order Møllar-Plesset perturbation (HMP2), capable of guiding the development of a good ansatz state while significantly reducing the quantum resources required to estimate the energy. | Session 31: Noisy Intermediate Scale Quantum Computers |

530 | A variational method for quantum simulation of time evolution | Wilkinson, Samuel; Nützel, Ludwig; Hartmann, Michael | Here we present an alternative variational method for finding gate sequences that approximate unitary evolution and evaluate the effectiveness of this method for simulating the Heisenberg model. | Session 31: Noisy Intermediate Scale Quantum Computers |

531 | Digital Quantum Simulation of Open Quantum Systems Using Quantum Imaginary Time Evolution | Kamakari, Hirsh; Motta, Mario; Minnich, Austin | We demonstrate our method through simulations of the spontaneous emission in the damped Jaynes-Cummings model on IBM quantum hardware. | Session 31: Noisy Intermediate Scale Quantum Computers |

532 | Variational preparation of finite-temperature states on a quantum computer (Part 1: theory) | Premaratne, Shavindra; Sagastizabal, Ramiro; Johri, Sonika; Zou, Xiang; Klaver, Berend; Rol, Michiel Adriaan; Negîrneac, Victor; S Moreira, Miguel; Muthusubramanian, Nandini; Beekman, Marc; Zachariadis, Chris; Ostroukh, Viacheslav; Haider, Nadia; Bruno, Alessandro; DiCarlo, Leonardo; Matsuura, Anne | Here, we describe a procedure to generate finite-temperature Gibbs states for the transverse-field Ising chain Hamiltonian, via preparation of thermofield double (TFD) states. | Session 31: Noisy Intermediate Scale Quantum Computers |

533 | Accurately computing electronic properties of materials using eigenenergies | Neill, Charles; Ioffe, Lev; Smelyanskiy, Vadim | Our work outlines an accurate method for quantum simulation and paves the way to study novel quantum materials with superconducting qubits. | Session 31: Noisy Intermediate Scale Quantum Computers |

534 | Efficient Preparation of Gutzwiller Ansatz on Noisy Intermediate-Scale Quantum Computers | Murta, Bruno; Fernandez-Rossier, Joaquin | To this end, we discuss how to efficiently prepare on a NISQC the Gutzwiller wavefunction, a simple, yet effective ansatz to approximate the ground state of the Fermi-Hubbard model, the reference model to describe correlated electrons in condensed matter. | Session 31: Noisy Intermediate Scale Quantum Computers |

535 | Dynamical Self-energy mapping for Quantum Computing. | Dhawan, Diksha; Metcalf, Mekena; Zgid, Dominika | Here, we present how to bypass this challengein practical molecular chemistry simulations on NISQ devices by employing a quantum–classicalhybrid algorithm allowing us to produce a sparse Hamiltonian which contains onlyO(n2) terms in aGaussian orbital basis when compared to theO(n4) terms of a standard Hamiltonian, wherenis thenumber of orbitals in the system. | Session 31: Noisy Intermediate Scale Quantum Computers |

536 | qubit-ADAPT-VQE: An adaptive algorithm for constructing hardware-efficient ansätze on a quantum processor | Tang, Ho Lun; Shkolnykov, Vladyslav; Barron, George; Grimsley, Harper; Mayhall, Nicholas; Barnes, Edwin; Economou, Sophia | Here, we present a hardware-efficient variant of this algorithm called qubit-ADAPT. | Session 31: Noisy Intermediate Scale Quantum Computers |

537 | Variational preparation of finite-temperature states on a quantum computer (Part 2: experiment) | Sagastizabal, Ramiro; Premaratne, Shavindra; Klaver, Berend; Rol, Michiel Adriaan; Negîrneac, Victor; S Moreira, Miguel; Zou, Xiang; Johri, Sonika; Muthusubramanian, Nandini; Beekman, Marc; Zachariadis, Chris; Ostroukh, Viacheslav; Haider, Nadia; Bruno, Alessandro; Matsuura, Anne; DiCarlo, Leonardo | Our method targets the generation of thermofield double states using a hybrid quantum-classical variational approach motivated by quantum-approximate optimization algorithms, without prior calculation of optimal variational parameters by numerical simulation. | Session 31: Noisy Intermediate Scale Quantum Computers |

538 | Quantum simulations of materials on near-term quantum computers | Ma, He; Govoni, Marco; Galli, Giulia | We present a quantum embedding theory for the calculation of strongly-correlated electronic states of active regions, with the rest of the system described within density functional theory. | Session 31: Noisy Intermediate Scale Quantum Computers |

539 | Hybrid Quantum-Classical Eigensolver Without Variation or Parametric Gates | Jouzdani, Pejman; Bringuier, Stefan | Here we present a process for obtaining the eigen-energy spectrum of electronic quantum systems. | Session 31: Noisy Intermediate Scale Quantum Computers |

540 | Quantum-optimal-control-inspired ansätze for variational quantum algorithms | Choquette, Alexandre; Di Paolo, Agustin; Barkoutsos, Panagiotis; Senechal, David; Tavernelli, Ivano; Blais, Alexandre | Here, we show that this approach is not always advantageous by introducing ansätze that incorporate symmetry-breaking unitaries. | Session 31: Noisy Intermediate Scale Quantum Computers |

541 | Digital Quantum Simulation of Non-Equilibrium Quantum Many-Body Systems | Fauseweh, Benedikt; Zhu, Jian-Xin | We explicitly include external perturbations, such as pulsed magnetic fields, to model excitation mechanisms in more realistic situations. | Session 31: Noisy Intermediate Scale Quantum Computers |

542 | Many-Body Thermodynamics on Quantum Computers via Partition Function Zeros | FRANCIS, AKHIL; Zhu, Daiwei; Huerta Alderete, Cinthia; Johri, Sonika; Xiao, Xiao; Freericks, James; Monroe, Christopher; Linke, Norbert; Kemper, Alexander | Here we show how to find partition function zeros on noisy intermediate-scale trapped ion quantum computers in a scalable manner, using the XXZ model as a prototype. | Session 31: Noisy Intermediate Scale Quantum Computers |

543 | Quantum Algorithms for Open Lattice Field Theories | Hubisz, Jay; Sambasivam, Bharath; Unmuth-Yockey, Judah | We explore these channels on a benchmark, the 1D quantum transverse Ising model with an imaginary longitudinal magnetic field, showing that observables can probe the Lee-Yang edge singularity. | Session 31: Noisy Intermediate Scale Quantum Computers |

544 | Calculation of the Green’s function on near-term quantum computers | Endo, Suguru; Kurata, Iori; Nakagawa, Yuya | Here, we propose two methods to calculate the Green’s function of a given Hamiltonian on near-term quantum computers. | Session 31: Noisy Intermediate Scale Quantum Computers |

545 | Digital quantum simulation of quantum synchronization dynamics on NISQ hardware | Koppenhoefer, Martin; Bruder, Christoph; Roulet, Alexandre | In this talk, we will discuss how the perturbative structure of quantum synchronization dynamics can be used to simplify the well-known algorithm of digital quantum simulation. | Session 31: Noisy Intermediate Scale Quantum Computers |

546 | A flexible initializer for parametrized quantum circuits | Sauvage, Frederic; Perdomo-Ortiz, Alejandro | Extending ideas from the field of meta-learning, we address this task from an initialization perspective, and propose a FLexible Initializer for Parametrized quantum circuits (FLIP) scheme which can be applied to any family of PQCs. | Session 31: Noisy Intermediate Scale Quantum Computers |

547 | Quantum optimization experiments with advanced mixers and controls | Alam, M. Sohaib; Grabbe, Shon; Hill, Alexander; Hodson, Mark; Gonzalez Izquierdo, Zoe; LaRose, Ryan; Lott, Aaron; Reagor, Matt; Rieffel, Eleanor; Sud, James; Venturelli, Davide; Wang, Zhihui; Wudarski, Filip | We show experimental benchmark results on a 32-qubit chip for circuits related to hard-constrained scheduling problems as well as MaxCut. | Session 31: Noisy Intermediate Scale Quantum Computers |

548 | Reducing circuit size in the variational quantum eigensolver — Part 1: Theory | Gujarati, Tanvi; Eddins, Andrew; Bravyi, Sergey; Hadfield, Charles; Mezzacapo, Antonio; Motta, Mario; Sheldon, Sarah | In the second half, we will present data from quantum hardware demonstrating the viability of the approach, and discuss technical details of the experimental realization. | Session 31: Noisy Intermediate Scale Quantum Computers |

549 | Reducing circuit size in the variational quantum eigensolver — Part 2: Experiment | Eddins, Andrew; Gujarati, Tanvi; Bravyi, Sergey; Hadfield, Charles; Mezzacapo, Antonio; Motta, Mario; Sheldon, Sarah | In the second half, we will present data from quantum hardware demonstrating the viability of the approach, and discuss technical details of the experimental realization. | Session 31: Noisy Intermediate Scale Quantum Computers |

550 | Mitigating global depolarizing noise with noise estimation circuits | Urbanek, Miroslav; Nachman, Benjamin; He, Andre; Bauer, Christian; De Jong, Wibe | We present a method to mitigate the global depolarizing noise by first estimating its rate by executing a noise estimation circuit and then correcting the output of the target circuit using the estimated noise rate. | Session 31: Noisy Intermediate Scale Quantum Computers |

551 | Error mitigation with Clifford quantum-circuit data | Czarnik, Piotr; Arrasmith, Andrew; Coles, Patrick; Cincio, Lukasz | For this purpose, we propose a novel, scalable error-mitigation method that applies to gate-based quantum computers [1]. | Session 31: Noisy Intermediate Scale Quantum Computers |

552 | Filter functions for robust quantum control | Hangleiter, Tobias; Teske, Julian David; Le, Isabel; Cerfontaine, Pascal; Bluhm, Hendrik | I conclude by presenting the open-source filter_functions software framework (https://github.com/qutech/filter_functions), which facilitates computing filter functions and their derivatives for arbitrary quantum gates. | Session 31: Noisy Intermediate Scale Quantum Computers |

553 | Energy gap calculation on near-term quantum hardware with robust phase estimation | Russo, Antonio; Baczewski, Andrew; Morrison, Benjamin; Rudinger, Kenneth | In particular, we calculate the energy landscapes of H 2 and H 3 on extant quantum hardware (pre-compiling to emulate hardware with significantly higher fidelities). | Session 31: Noisy Intermediate Scale Quantum Computers |

554 | Unified approach to data-driven quantum error mitigation | Lowe, Angus; Hunter Gordon, Max; Czarnik, Piotr; Arrasmith, Andrew; Coles, Patrick; Cincio, Lukasz | Here we propose a novel, scalable error mitigation method that conceptually unifies ZNE and CDR. | Session 31: Noisy Intermediate Scale Quantum Computers |

555 | Randomized Benchmarking for Continuosly Parametrized Entangling Gates | Mayer, Karl; Baldwin, Charles; Hayes, David | We present a variation of the randomized benchmarking (RB) protocol in which random sequences are drawn from a twirling group containing entangling gates with arbitrary rotation angles. | Session 31: Noisy Intermediate Scale Quantum Computers |

556 | Measuring global state properties with simple random single-qubit rotations | Yanay, Yariv; Tahan, Charles | We show a framework for evaluating such protocols, and analytically calculate the required number of measurements, finding significant improvement in the scaling behavior. | Session 31: Noisy Intermediate Scale Quantum Computers |

557 | Analyzing the Performance of Variational Quantum Factoring on a Superconducting Quantum Processor | Karamlou, Amir; Simon, William; Scholten, Travis; Katabarwa, Amara; Peropadre, Borja; Cao, Yudong | We use the variational quantum factoring (VQF) algorithm as a prototypical hybrid workflow and execute experimental demonstrations using a superconducting quantum processor. | Session 31: Noisy Intermediate Scale Quantum Computers |

558 | Confinement and Entanglement Dynamicson a Digital Quantum Computer | Vovrosh, Joseph; Knolle, Johannes | We report quantitative confinement signatures of the TFIM on an IBM quantum computer observed via two distinct velocities for information propagation from domain walls and their mesonic bound states. | Session 31: Noisy Intermediate Scale Quantum Computers |

559 | Analogue Floquet quantum simulation on NISQ devices | Malz, Daniel; Smith, Adam | Previous theoretical and experimental research has shown that current NISQ devices constitute powerful platforms for analogue (continuous-time) quantum simulation. | Session 31: Noisy Intermediate Scale Quantum Computers |

560 | Holographic quantum dynamics simulations on a trapped ion quantum computer | Chertkov, Eli; Foss-Feig, Michael; Hayes, David; Potter, Andrew | In this talk, we present our results for holoQUADS simulations performed on a Honeywell quantum computer for "dual-unitary" circuits, a class of quantum circuits whose time evolution is exactly solvable [3], and find good agreement with theoretical predictions. | Session 31: Noisy Intermediate Scale Quantum Computers |

561 | Quantum computer-aided design: digital quantum simulation of quantum processors | Kyaw, Thi Ha; Menke, Tim; Sim, Sukin; Sawaya, Nicolas; Oliver, William; Guerreschi, Gian Giacomo; Aspuru-Guzik, Alan | To circumvent this slow-down, we address the question of how one can design and test the performance of the sub-modules of next-generation quantum devices–by using existing quantum computers. | Session 31: Noisy Intermediate Scale Quantum Computers |

562 | A Dynamically Reconfigurable Quantum Processor Architecture | Marinelli, Brian; Luo, Jie; Lee, Kyunghoon; Santiago, David; Siddiqi, Irfan | Here we propose our scheme to utilize 3D integration techniques and parametric coupling in building a high-performance 3D QPU with programmable arbitrary qubit connectivity enabled by the chip architecture. | Session 31: Noisy Intermediate Scale Quantum Computers |

563 | Operating a Dynamically reconfigurable Quantum Processor with 8 Superconducting Transmon Qubits | Luo, Jie; Marinelli, Brian; Lee, Kyunghoon; Santiago, David; Siddiqi, Irfan | In this talk, we will present the experimental apparatus as well as the various experimental results that showcase the SpiderNet architecture’s unique capabilities. | Session 31: Noisy Intermediate Scale Quantum Computers |

564 | Performance Study of Superconducting Quantum Computing Chips under Different Architecture Design | Hu, Wei; Pi, Jiawei; Xia, Weiye; Zhang, Xinding; Xu, Hua | This work provides QC researchers a systematic approach to evaluate their processor design, and moreover, to optimize their processor design. | Session 31: Noisy Intermediate Scale Quantum Computers |

565 | Toffoli Gate Depth Reduction in Fixed Frequency Transmon Qutrits | Galda, Alexey; Cubeddu, Michael; Kanazawa, Naoki; Narang, Prineha; Earnest, Nathan | We present how, using Qiskit Pulse, one can program a quantum computer over the cloud at the pulse level and implement ternary logic operations on fixed-frequency transmons. | Session 31: Noisy Intermediate Scale Quantum Computers |

566 | Reliability of analog quantum simulation in chaotic systems | Chinni, Karthik; Poggi, Pablo; Deutsch, Ivan | We thus seek to assess the reliability of an analog quantum simulator, which does not have access to error correction, in the presence of chaotic perturbations. | Session 31: Noisy Intermediate Scale Quantum Computers |

567 | Using Inherent Qubit Decoherence To Simulate Thermal Relaxation in Spin Chemistry Systems on NISQ Machines | Rost, Brian; Jones, Barbara; Vyushkova, Mariya | Here we seek to take advantage of qubit decoherence as a resource for simulating the behavior of real-world quantum systems, which are always subject to decoherence, with no additional computational overhead. | Session 31: Noisy Intermediate Scale Quantum Computers |

568 | Pipeline architecture for a silicon qubit processor | Patomäki, Sofia; Fogarty, Michael; Cai, Zhenyu; Benjamin, Simon; Morton, John | We propose a NISQ processor architecture using a qubit pipeline in which all run-time control is applied globally, simplifying the number and complexity of required control and interconnect resources. | Session 31: Noisy Intermediate Scale Quantum Computers |

569 | A survey of dynamical decoupling sequences on a programmable superconducting quantum computer | Ezzell, Nic; Pokharel, Bibek; Lidar, Daniel | In this work we update the status of previous DD surveys in light of recent advancements with cloud-based superconducting qubit devices. | Session 31: Noisy Intermediate Scale Quantum Computers |

570 | Mid-circuit measurement and active feed-forward in the Honeywell QCCD quantum computer | Ryan-Anderson, Ciaran | Here we present experimental characterizations of these operations including both primitive as well as algorithmic benchmarking results. | Session 31: Noisy Intermediate Scale Quantum Computers |

571 | Realization of higher winding number topological states of the long-range magnonic SSH model using superconducting circuits | Tan, Adrian; Luo, Jie; Marinelli, Brian; Santiago, David; Siddiqi, Irfan; Minnich, Austin | Here, we report the realization of topological states of the extended magnonic SSH model using an analog superconducting circuit quantum simulator with all-to-all connections. | Session 31: Noisy Intermediate Scale Quantum Computers |

572 | Rescaled time, shortcuts to adiabaticity, and Dirac dynamics | ROYCHOWDHURY, AGNIVA; Deffner, Sebastian | In this work, we explore both classical and quantum variants of shortcuts from so-called time-rescaled dynamics. | Session 32: Novel Quantum Control Techniques |

573 | Shortcuts to adiabatic pumping in classical stochastic and non-Hermitian systems | Funo, Ken; Lambert, Neill; Nori, Franco; Flindt, Christian | We consider adiabatic charge pumping in classical stochastic and non-Hermitian systems. | Session 32: Novel Quantum Control Techniques |

574 | Engineering fast high-fidelity bias-preserving gates on stabilized cat qubits | Xu, Qian; Iverson, Joseph; Brandao, Fernando; Jiang, Liang | We show that adding additional engineered two-photon dissipation helps suppress the minor type of error but enhances the major type of error at the same time. | Session 32: Novel Quantum Control Techniques |

575 | Quantum Control via Enhanced Shortcuts to Adiabaticity | Kiely, Anthony | We propose a technique for such scenarios, called enhanced shortcuts to adiabaticity (eSTA). | Session 32: Novel Quantum Control Techniques |

576 | Geometric filter function approach to dynamically corrected gates that suppress time-dependent noise | Li, Bikun; Calderon-Vargas, Fernando.; Zeng, Junkai; Barnes, Edwin | We present a geometric filter function method for designing smooth control pulses that dynamically correct time-dependent noise errors. | Session 32: Novel Quantum Control Techniques |

577 | Noise-resistant Landau-Zener sweeps design from geometrical formalism | Zhuang, Fei; Zeng, Junkai; Barnes, Edwin; Economou, Sophia | In the general case, where avoided crossings are not just from noise, we arrive at a robust sweeping protocol for gate design through a technique we introduce for building closed 3D space curves with the desired properties. | Session 32: Novel Quantum Control Techniques |

578 | Tailored quantum simulation with analog control optimization | Kairys, Paul; Humble, Travis | We apply quantum optimal control theory to compile hardware-level controls that drive quantum dynamics of the Bose-Hubbard system within a model circuit-QED Hamiltonian. | Session 32: Novel Quantum Control Techniques |

579 | Stochastic action principle for Gaussian states of a simple harmonic oscillator | Karmakar, Tathagata; Lewalle, Philippe; Jordan, Andrew | In my presentation, I will describe the application of Chantasri-Dressel-Jordan formulation (CDJ) of stochastic action principle for a quantum simple harmonic oscillator under weak position and momentum measurements. | Session 32: Novel Quantum Control Techniques |

580 | Semi-Analytic Method for Rapid Simulation and Optimization of Driven Quantum Systems | Shillito, Ross; Gross, Jonathan; Di Paolo, Agustin; Genois, Elie | In this work, we present a semi-analytic method based on a Dyson expansion for arbitrary time-dependent quantum systems with a diagonal circuit Hamiltonian. | Session 32: Novel Quantum Control Techniques |

581 | Numerical Optimal Control of Open Quantum Systems | Petersson, N. Anders; Guenther, Stefanie; Tomarken, Spencer; DuBois, Jonathan | We consider the ground state initialization problem for a superconducting (multi-level) qudit in a 3-D cavity, where the quantum system is modeled by Lindblad’s master equation. | Session 32: Novel Quantum Control Techniques |

582 | Remote Addressing of Quantum Emitters with Chirped Pulses | Casulleras, Silvia; Gonzalez-Ballestero, Carlos; Maurer, Patrick; Garcia-Ripoll, Juan Jose; Romero-Isart, Oriol | We introduce a particular family of chirped pulses that dynamically self-focus during their evolution in a medium with a quadratic dispersion relation. | Session 32: Novel Quantum Control Techniques |

583 | Unraveling quantum and classical speed limits on observables | Garcia-Pintos, Luis; Del Campo, Adolfo; Gorshkov, Alexey; Green, Jason; Nicholson, Schyuler | We introduce speed limits to the evolution of observables of open quantum systems with arbitrary differentiable dynamics, generalizing the original derivation by Mandelstam and Tamm in 1945. | Session 32: Novel Quantum Control Techniques |

584 | Optimizing feedback cooling for weakly monitored Bose-Einstein condensates | Hurst, Hilary; Guo, Shangjie; Spielman, Ian | In this talk, I focus on applying feedback via a single-particle potential, which prevents runaway heating that would otherwise result from measurement backaction. | Session 32: Novel Quantum Control Techniques |

585 | Measurement-driven navigation in many-body Hilbert space | Herasymenko, Yaroslav; Gornyi, Igor; Gefen, Yuval | For advantageous decision-making, we offer Hilbert space orientation techniques, comparable to those used in navigation. | Session 32: Novel Quantum Control Techniques |

586 | Proof of concept high energy physics application of superconducting radio frequency cavities for quantum computation: neutrino oscillation in free space and matter | Job, Joshua; Kurkcuoglu, Doga; Adachi, Steven; Perdue, Gabriel | We present results of a proof of concept application of superconducting radio frequency cavities for quantum computation in simulation in a high energy physics application, namely the oscillation of neutrino flavors in free space and matter. | Session 32: Novel Quantum Control Techniques |

587 | Towards High-Fidelity Gates in the Soft Zero-Pi Qubit | Premkumar, Anjali; Gyenis, Andras; Croot, Xanthe; Mundada, Pranav; Di Paolo, Agustin; Koch, Jens; Blais, Alexandre; Houck, Andrew | Here, we address some outstanding challenges facing the soft zero-pi qubit. | Session 33: Novel Qubits |

588 | Protected C-Parity Qubits Part 1: Characterization and Protection | Dodge, Kenneth; Liu, Yebin; Cole, Brad; Ku, Jaseung; Senatore, Michael; Shearrow, Abigail; Zhu, Shaojiang; Abdullah, Sohair; Klots, Andrey; Faoro, Lara; Ioffe, Lev; McDermott, Robert; Plourde, Britton | Here, we will describe our experimental characterization of devices with concatenated π-periodic elements through spectroscopy and time-domain measurements. | Session 33: Novel Qubits |

589 | Protected C-Parity Qubits Part 2: Gate Operations | Shearrow, Abigail; Zhu, Shaojiang; Abdullah, Sohair; Dodge, Kenneth; Liu, Yebin; Cole, Bradley; Ku, Jaseung; Senatore, Michael; Klots, Andrey; Faoro, Lara; Ioffe, Lev; Plourde, Britton; McDermott, Robert | In this talk we describe the implementation of protected gate operations in the C-parity qubit. | Session 33: Novel Qubits |

590 | Modular and compact designs for multi-qubit devices in 2D and 3D cQED architecture | Bhattacharjee, Anirban; Chand, Madhavi; Hazra, Sumeru; Salunkhe, Kishor; Bothara, Gaurav; Patankar, Meghan; Vijay, R | Here, we introduce a modular cQED design for medium scale circuits in both 2D and 3D architecture by combining modularity with a compact design. | Session 33: Novel Qubits |

591 | Implementation of Protected Qubits with π-periodic Josephson Elements | Plourde, Britton | I will present progress with the implementation and characterization of these devices and the pathway to high-fidelity protected gate operations. | Session 33: Novel Qubits |

592 | Investigation of databased calibration for 1-Port cryogenic measurements | Singh, Suren; Wang, Haozhi; Mutus, Josh; Pappas, David; McRae, Corey Rae; Bardin, Joseph | In this talk we will start with a basic understanding on the systematic errors that are inherent in a VNA measurement and classical methodology for correction of these errors. | Session 33: Novel Qubits |

593 | Improved resonator measurement using 1-port cryogenic calibration | Wang, Haozhi; Singh, Suren; McRae, Corey Rae; Bardin, Joseph; Mutus, Josh; Pappas, David | Improved resonator measurement using 1-port cryogenic calibration | Session 33: Novel Qubits |

594 | Magnifying quantum phase fluctuations with Cooper-pair pairing | Smith, Clarke; Villiers, Marius; Marquet, Antoine; Palomo, José; Delbecq, Matthieu; Kontos, Takis; Campagne-Ibarcq, Phillipe; Douçot, Benoit; Leghtas, Zaki | Here we take a complementary approach and fabricate a generalized Josephson element that can be tuned in situ between one- and two-Cooper-pair tunneling, doubling the frequency of the corrugation and thereby magnifying the number of wells probed by the ground state. | Session 33: Novel Qubits |

595 | Ultrahigh-impedance suspended Josephson circuits for quantum computing, simulations, and metrology | Mencia, Ray; Kuzmin, Roman; Pechenezhskiy, Ivan; Manucharyan, Vladimir | By releasing Josephson chains off the substrate, we can combine the maximal per-unit-length inductance with the minimal stray capacitance, thereby obtaining the highest impedance electromagnetic structures available today. | Session 33: Novel Qubits |

596 | Design Progress for Tunable Current Mirror Qubits | Ferguson, David; Khalil, Moe | Here we report on new design innovations for tunable current mirror qubits including circuits that allow novel forms of readout and coupling between qubits. | Session 33: Novel Qubits |

597 | Inductively shunted transmon qubit for ZZ interaction cancellation | Zuo, Kun; Urade, Yoshiro; Yan, Zhiguang; Tamate, Shuhei; Tabuchi, Yutaka; Terai, Hirotaka; Nakamura, Yasunobu | In light of this, here we present the so-called inductively shunted transmon that has a positive anharmonicity for the purpose of ZZ cancellation. | Session 33: Novel Qubits |

598 | Investigating unwanted transitions in dispersive qubit measurement at high readout power | Salunkhe, Kishor; Kundu, Suman; Gheeraert, Nicolas; Patankar, Meghan; Vijay, R | We investigate a multimodal circuit [1], nicknamed the “quantromon”, with cross-Kerr coupling between the modes: a split transmon qubit and a linear cavity. | Session 33: Novel Qubits |

599 | Electronically-tunable quantum phase slips in voltage-biased superconducting rings | Kenawy, Ahmed; Magnus, Wim; Soree, Bart | Here, we present the use of a bias voltage across a superconducting loop to electrostatically induce a weak link, thereby enhancing the rate of quantum phase slips without physically interrupting the loop. | Session 33: Novel Qubits |

600 | Tracking evaporative cooling of an atomic quantum gas in real time | Zeiher, Johannes | We use a non-invasive measurement scheme to record real-time traces of the atom number dynamics in a mesoscopic quantum gas undergoing evaporative cooling. | Session 34: Open Quantum Systems |

601 | Time-Evolution of Open Quantum Systems using Quantum and Classical Resources | Head-Marsden, Kade; Narang, Prineha | Here, I will discuss reduced density matrix methods which extend the Kraus mapping formalism to capture non-Markovian dynamics using both classical and quantum computational resources. | Session 34: Open Quantum Systems |

602 | Hidden time-reversal symmetry, quantum detailed balance and exactly-solvable driven-dissipative quantum systems | Roberts, David; Lingenfelter, Andrew; Clerk, Aashish | We show that such systems can nonetheless have one or more hidden time-reversal symmetries, a concept that we define in terms of correlation functions and thermofield double states. | Session 34: Open Quantum Systems |

603 | Steady-state properties of quantum non-Hermitian lattice models | McDonald, Alexander; Hanai, Ryo; Clerk, Aashish | Here, we address these issues in a more physical manner, using the fact that quantum non-Hermitian dynamics almost always requires a coupling to external dissipative environments. | Session 34: Open Quantum Systems |

604 | Measurement and entanglement phase transitions in all-to-all quantum circuits | Nahum, Adam; Roy, Sthitadhi; Skinner, Brian; Ruhman, Jonathan | We introduce theoretical approaches to measurement-induced phase transitions in "all-to-all" quantum circuits with unitaries and measurements, in which any qubit can couple to any other. | Session 34: Open Quantum Systems |

605 | Liouvillianity breaking in dissipative interacting Floquet systems under high-frequency drive | Mizuta, Kaoru; Takasan, Kazuaki; Kawakami, Norio | We have made an answer for generic systems with local interactions. | Session 34: Open Quantum Systems |

606 | Chiral quantum optics with giant atoms | Soro Álvarez, Ariadna; Frisk Kockum, Anton | In the present work, we prove that this decoherence-free interaction is also possible when the coupling to the waveguide is chiral. | Session 34: Open Quantum Systems |

607 | Transport and dynamics in the frustrated two-bath spin-boson model | Belyansky, Ron; Whitsitt, Seth; Lundgren, Rex; Wang, Yidan; Vrajitoarea, Andrei; Houck, Andrew; Gorshkov, Alexey | We study the non-equilibrium dynamics, including transport properties, of photons in the two-bath spin-boson model, in which a spin-1/2 particle is frustratingly coupled to two independent Ohmic bosonic baths. | Session 34: Open Quantum Systems |

608 | Time-coarse-grained dynamics of open quantum systems: The system-plus-reservoir approach and effective models | Fan, Wentao; Tureci, Hakan; Sinha, Kanupriya | In this work, we study temporal coarse-graining as a basis to derive accurate effective models for open quantum systems. | Session 34: Open Quantum Systems |

609 | Symmetry breaking and error correction in open quantum systems | Lieu, Simon; Belyansky, Ron; Young, Jeremy; Lundgren, Rex; Albert, Victor; Gorshkov, Alexey | We characterize the possible Z_n symmetry breaking transitions for both cases. | Session 34: Open Quantum Systems |

610 | Time Reversal Symmetry Breaking in Driven Dissipative Spin Systems | Paz, Daniel; Maghrebi, Mohammad | In this talk, I discuss the impact of time-reversal symmetry breaking on driven-dissipative systems. | Session 34: Open Quantum Systems |

611 | Super-operator structures and no-go theorems for dissipative quantum phase transitions | Barthel, Thomas; Zhang, Yikang | Here, we consider Markovian systems and elucidate structures of the Liouville super-operator that generates the dynamics. | Session 34: Open Quantum Systems |

612 | Extending the quantum coherence of a qubit via engineering the noise spectrum of its environment | Joos, Maxime; Bluvstein, Dolev; Lyu, Yuanqi; Weld, David; Jayich, Ania | Using a shallow defect center coupled to RF-driven surface spins, we demonstrate experimentally that spectral engineering of the spin bath enables improved qubit coherence. | Session 34: Open Quantum Systems |

613 | Catalyst Hamiltonians in Quantum Adiabatic Optimization: How much can they help? | Albash, Tameem | In this talk, we review recent work on interpolations with a `catalyst’ Hamiltonian, corresponding to interpolations with an intermediate Hamiltonian that is different from the driver and problem Hamiltonians. | Session 35: Quantum Annealing and Optimization |

614 | Coherent oscillations in diabatic quantum annealing schedules | Trappen, Robbyn; Dai, Xi; Tennant, Daniel; Melanson, Denis; Yurtalan, Ali; Yang, Rui; Das, Rabindra; Kim, David; Melville, Alexander; Niedzielski, Bethany; Oliver, William; Yoder, Jonilyn; Weber, Steven; Kerman, Andrew; Gibson, Joseph; Grover, Jeffrey; Dissler, Steven; Basham, James; Novikov, Sergey; Albash, Tameem; Mozgunov, Evgeny; Khezri, Mostafa; Chen, Huo; Lidar, Daniel; Lupascu, Adrian | Theoretical studies involving multiple diabatic transitions show oscillations in the ground state probability as a function of anneal time, highlighting the importance of coherence in quantum annealing. | Session 35: Quantum Annealing and Optimization |

615 | Customized annealing schedules | Khezri, Mostafa; Mozgunov, Evgeny; Lidar, Daniel | In this talk, we show how superconducting circuits, in particular capacitively shunted flux qubits (CSFQs), can be used to construct quantum annealing systems by providing methods for mapping circuit flux biases to Ising spin coefficients. | Session 35: Quantum Annealing and Optimization |

616 | Fair Sampling and Entanglement in Transverse-Field Quantum Annealing | Lantz, Asher; Herdman, Chris | In this work we investigate the entanglement structure of ground states in a fully-connected transverse field Ising spin glass. | Session 35: Quantum Annealing and Optimization |

617 | The Perils of Embedding for Quantum Sampling | Marshall, Jeffrey; Mossi, Gianni; Rieffel, Eleanor | Using a quantum Monte-Carlo algorithm which is specifically adapted to take thermal samples from an embedded Hamiltonian, we i) provide theory and numerics showing there is an exponential reduction in the probability to sample the logical subspace directly as a function of the transverse field strength, and ii) show how certain observables can be biased by the embedding process. | Session 35: Quantum Annealing and Optimization |

618 | Experimental studies of reverse annealing of p-spin problem on D-Wave quantum annealer | Bando, Yuki; Yip, Ka Wa; Nishimori, Hidetoshi; Lidar, Daniel | We can find correct solutions with near certainty. | Session 35: Quantum Annealing and Optimization |

619 | Programmable Quantum Annealing Architectures with Ising Quantum Wires | Qiu, Xingze; Zoller, Peter; Li, Xiaopeng | In this talk we will discuss the question of engineering long-range interactions by locally-coupled Ising ferromagnetic quantum wires [1]. | Session 35: Quantum Annealing and Optimization |

620 | Energy Efficient Mobile Network Routing using Hybrid Quantum Algorithm | Chen, Jie; Date, Prasanna; Chancellor, Nicholas; Mohammed, Atiquzzaman; Sun, Hongjian; Sreenan, Cormac; Kendon, Viv | In this work, we use the unleashed computational power of the QPU by DWave Inc. to attain the ground truth solution to this routing problem in general. | Session 35: Quantum Annealing and Optimization |

621 | Spin representation of bifurcation-based quantum annealing with Kerr parametric oscillators | Miyazaki, Ryoji | We transform interacting KPOs to spin systems and discuss the scheme in terms of the spin representation. | Session 35: Quantum Annealing and Optimization |

622 | Multi-spin chain gadget with exponentially small gap controlled by a single spin | Dai, Xi; Trappen, Robbyn; Tennant, Daniel; Melanson, Denis; Yurtalan, Muhammet Ali; Yang, Rui; Melville, Alexander; Niedzielski, Bethany; Das, Rabindra; Kim, David; Oliver, William; Yoder, Jonilyn; Weber, Steven; Kerman, Andrew; Gibson, Joseph; Grover, Jeffrey; Disseler, Steven; Basham, James; Novikov, Sergey; Mozgunov, Evgeny; Khezri, Mostafa; Chen, Huo; Lidar, Daniel; Albash, Tameem; Lupascu, Adrian | We propose an annealing protocol with a multi-spin chain gadget where the minimum spectral gap closes exponentially with system size and can be controlled by acting only on one spin. | Session 35: Quantum Annealing and Optimization |

623 | Reinforcement learning assisted quantum adiabatic algorithm design | Lin, Jian; Zhang, Zhengfeng; Zhang, Junping; Li, Xiaopeng | We develop a framework to optimize the adiabatic quantum algorithm for prime factorization using a quadratic Ising Hamiltonian encoding. | Session 35: Quantum Annealing and Optimization |

624 | Adiabatic reverse annealing with dephasing | Passarelli, Gianluca; Yip, Ka Wa; Lidar, Daniel; Lucignano, Procolo | Early works concerning the topic showed that ARA in a unitary setting is efficient in this regard for the fully connected ferromagnetic p-spin model, an exactly solvable model frequently used to benchmark QA [1,2]. | Session 35: Quantum Annealing and Optimization |

625 | An energetic perspective on rapid quenches in quantum annealing | Callison, Adam; Festenstein, Max; Chen, Jie; Nita, Laurentiu; Kendon, Viv; Chancellor, Nicholas | We develop a theoretical understanding and several practical tools for this regime. | Session 35: Quantum Annealing and Optimization |

626 | Combinatorial optimization using quantum or classical driven systems | Goto, Hayato | Here we review QbM and SBM together with related works. | Session 35: Quantum Annealing and Optimization |

627 | Benchmarking State Of The Art Ising Machines | Kowalsky, Matthew; Albash, Tameem; Hen, Itay; Lidar, Daniel | In this work, we seek to provide answers to these questions by uniform benchmarks across a wide range of state-of-the-art solvers, both classical and quantum, including the establishment of scaling comparisons on planted solution instances. | Session 35: Quantum Annealing and Optimization |

628 | Ghost Bifurcations in Coupled Parametric Oscillators | Heugel, Toni; Marty, Christian; Chitra, Ramasubramanian; Zilberberg, Oded; Eichler, Alexander | Here we address this question by considering a network of two parametric resonators. | Session 35: Quantum Annealing and Optimization |

629 | Using Quantum Annealers to Calculate Ground State Properties of Molecules | Copenhaver, Justin; Wasserman, Adam; Wehefritz-Kaufmann, Birgit | In this paper we review two different methods for finding the ground state of molecular Hamiltonians using quantum annealers. | Session 35: Quantum Annealing and Optimization |

630 | D-Wave as a generator of structural models in materials science | Carnevali, Virginia; Siloi, Ilaria; DiFelice, Rosa; Fornari, Marco | We show the feasibility of quantum annealing in exploring the energy landscape of materials that deviate from the ideal crystalline phase, specifically vacancy defects in graphene and disordered silicon. | Session 35: Quantum Annealing and Optimization |

631 | Modeling order-disorder phase transitions with a quantum annealer | Siloi, Ilaria; Carnevali, Virginia; DiFelice, Rosa; Fornari, Marco | Starting from a representation of crystal structures in terms of networks, we develop models of order-disorder phase transitions for two prototypical classes of materials (entropy stabilized alloys and perovskites) that are directly implementable on the D-Wave devices. | Session 35: Quantum Annealing and Optimization |

632 | Problem encoding and quantum annealer performance | Chancellor, Nicholas; Chen, Jie; Stollenwerk, Tobias | I present ongoing work on experimentally testing the performance of a new way of encoding integer variables onto quantum annealers based on the physics of domain walls as presented in [1]. | Session 35: Quantum Annealing and Optimization |

633 | Qubit-efficient encoding schemes for binary optimisation problems | Tan, Benjamin; Lemonde, Marc-Antoine; Thanasilp, Supanut; Tangpanitanon, Jirawat; Angelakis, Dimitris | We propose a set of variational quantum algorithms for solving quadratic unconstrained binary optimization problems where a problem consisting of n c classical variables can be implemented on as little as O(log n c) qubits. | Session 35: Quantum Annealing and Optimization |

634 | Solving hard optimization problems using quantum walks | Mirkarimi, Puya; Callison, Adam; Chancellor, Nicholas; Kendon, Viv | This is promising for practical application on realistic noisy quantum hardware, either purpose-built quantum annealers, or using QAOA algorithms. | Session 35: Quantum Annealing and Optimization |

635 | An Approach for Combinatorial Optimization on Noisy Quantum Computers | Liu, Xiaoyuan; Angone, Anthony; Shaydulin, Ruslan; Safro, Ilya; Alexeev, Yuri; Cincio, Lukasz | In this paper, we propose an iterative Layer-VQE (L-VQE) approach, inspired by Variational Quantum Eigensolver. | Session 35: Quantum Annealing and Optimization |

636 | A Filter Function Perspective on Faulty Quantum Approximate Optimization Algorithms | Quiroz, Gregory; Titum, Paraj; Lougovski, Pavel; Schultz, Kevin; Dumitrescu, Eugen; Hen, Itay | In combinatorial optimization, approximation algorithms aim to find approximate solutions with provable guarantees on the distance between the returned solution and the global optimum. | Session 35: Quantum Annealing and Optimization |

637 | Solving random Ising graphs with nonlinear parametric oscillators | Calvanese Strinati, Marcello; Bello, Leon; Dalla Torre, Emanuele; Pe’er, Avi | Here we show that for pump power sufficiently above the threshold the system can find correct Ising solutions. | Session 35: Quantum Annealing and Optimization |

638 | Oscillating transverse fields in digital quantum | Tang, Zhijie; Kapit, Eliot | We apply the digitized version of RFQA to varioustrial problems using classical numerical simulation, and show that RFQAis a potentially promising tool for solving hard problems in optimizationand machine learning. | Session 35: Quantum Annealing and Optimization |

639 | Analytical framework for Quantum Alternating Operator Ansätze | Hadfield, Stuart; Hogg, Tad; Rieffel, Eleanor | We develop a framework for analyzing quantum alternating operator ansätze circuits, in particular the quantum approximate optimization algorithm (QAOA). | Session 35: Quantum Annealing and Optimization |

640 | Applying the Quantum Approximate Optimization Algorithm to the Tail Assignment Problem: part 1 | Vikstål, Pontus; Grönkvist, Mattias; Svensson, Marika; Andersson, Martin; Johansson, Göran; Ferrini, Giulia | In this work, we study numerically the solution of an airline optimization problem, namely the Tail-Assignment problem (TAS), on near-term quantum processors composed of up to 25 qubits, by using the quantum approximate optimization algorithm (QAOA). | Session 35: Quantum Annealing and Optimization |

641 | Classical symmetries and QAOA | Shaydulin, Ruslan; Hadfield, Stuart; Hogg, Tad; Safro, Ilya | We study the relationship between the quantum approximate optimization algorithm (QAOA) and the classical symmetries of the problem cost function to be optimized. | Session 35: Quantum Annealing and Optimization |

642 | Empirical performance bounds for quantum approximate optimization | Lotshaw, Phillip; Humble, Travis; Herrman, Rebekah; Ostrowski, James | We find the expectation values for the approximation ratios are not very sensitive to graph structure, with distributions over the sets of graphs that narrow as the number of QAOA layers increases. | Session 35: Quantum Annealing and Optimization |

643 | Quantifying the efficiency of state preparation via quantum variational eigensolvers | Matos, Gabriel; Johri, Sonika; Papic, Zlatko | Here, we propose that the success of QAOA in preparing ordered states is related to the interaction distance of the target state, which measures how close that state is to the manifold of all Gaussian states in an arbitrary basis of single-particle modes. | Session 35: Quantum Annealing and Optimization |

644 | Effect of noise models on QAOA performance for Max-Cut | Majumdar, Ritajit; Larkin, Jason; Guerreschi, Gian Giacomo; Sur-Kolay, Susmita | In this work, we study the effect of noise models such as amplitude damping, bit/phase flip, and depolarizing models on QAOA for several graph classes. | Session 35: Quantum Annealing and Optimization |

645 | Lyapunov control-inspired protocol for quantum approximate optimization | Magann, Alicia; Rudinger, Kenneth; Grace, Matthew; Sarovar, Mohan | In this talk, we introduce an alternate strategy based on Lyapunov control that offers a deterministic, constructive protocol for assigning values to the quantum circuit parameters, such that the problem Hamiltonian’s expectation value decreases layer-by-layer. | Session 35: Quantum Annealing and Optimization |

646 | Warm-starting quantum optimization | Egger, Daniel; Marecek, Jakub; Woerner, Stefan | Here, we discuss how to warm-start quantum optimization with an initial state corresponding to the solution of a relaxation of a combinatorial optimization problem and how to analyze properties of the associated quantum algorithms. | Session 35: Quantum Annealing and Optimization |

647 | Constrained Quantum Annealing for Circuit Fault Diagnosis | Leipold, Hannes; Spedalieri, Federico | We present a very general construction for quantum annealing protocols for solving Circuit Fault Diagnosis (CFD) problems that restrict the evolution to the feasible space of solutions using all local driver terms. | Session 35: Quantum Annealing and Optimization |

648 | Towards Quantum Gate-Model Heuristics for Real-World Planning Problems | Stollenwerk, Tobias; Hadfield, Stuart; Wang, Zhihui | Towards tackling such problems with quantum computers using quantum approximate optimization algorithms, we present novel efficient quantum alternating operator ansatz (QAOA) constructions for optimization problems over proper colorings of chordal graphs. | Session 35: Quantum Annealing and Optimization |

649 | Impact of Graph Structure for QAOA Performance on MaxCut | Herrman, Rebekah; Treffert, Lorna; Ostrowski, James; Lotshaw, Phillip; Humble, Travis; Siopsis, George | To do this, we examine correlations between graph properties and metrics associated with QAOA performance. | Session 35: Quantum Annealing and Optimization |

650 | Improving the Performance of Quantum Approximate Optimization Algorithm Through an Adaptive, Problem-Tailored Ansatz | Zhu, Linghua; Tang, Ho Lun; Barron, George; Calderon-Vargas, Fernando.; Mayhall, Nicholas; Barnes, Edwin; Economou, Sophia | We address this problem by introducing a new method for creating wavefunction ansätze iteratively in a way that is tailored to the problem being solved and, if desired, to the quantum hardware it is being solved on. | Session 35: Quantum Annealing and Optimization |

651 | Applying the Quantum Approximate Optimization Algorithm to the Tail Assignment Problem: part 2 | Svensson, Marika; Andersson, Martin; Grönkvist, Mattias; Vikstål, Pontus; Dubhashi, Devdatt; Ferrini, Giulia; Johansson, Göran | We investigate the Quantum Approximate Optimization Algorithm (QAOA) applied to the Exact Cover and Set Partitioning problem with multiple feasible solutions. | Session 35: Quantum Annealing and Optimization |

652 | Low depth mechanisms for quantum optimization | McClean, Jarrod; Harrigan, Matthew; Mohseni, Masoud; Rubin, Nicholas; Jiang, Zhang; Boixo, Sergio; Smelyanskiy, Vadim; Babbush, Ryan; Neven, Hartmut | In this work, we develop intuitive constructions for a large class of these algorithms based on connections to simple dynamics of quantum systems, quantum walks, and classical continuous relaxations. | Session 35: Quantum Annealing and Optimization |

653 | Efficient analytic construction of quantum circuits for MaxCut problems | Kosugi, Taichi; Nishi, Hirofumi; Matsushita, Yu-ichiro | For the quantum imaginary-time evolution method[1, 2] for MaxCut problems, we derive the conditions imposed on the gate parameters, from which they can be calculated analytically. | Session 35: Quantum Annealing and Optimization |

654 | Benchmarking and Mitigating Coherent Errors in Controlled-Phase Gates due to Spectator Qubits | Krinner, Sebastian; Lazar, Stefania; Remm, Ants; Andersen, Christian Kraglund; Lacroix, Nathan; Norris, Graham; Hellings, Christoph; Gabureac, Mihai; Eichler, Christopher; Wallraff, Andreas | Benchmarking and Mitigating Coherent Errors in Controlled-Phase Gates due to Spectator Qubits | Session 36: Quantum Characterization, Verification, and Validation |

655 | Characterization and Benchmarking of Quantum Computers using Cycle Benchmarking Techniques | Lilly, Megan; Humble, Travis | We use the noise models in numerical simulation and compare to experiment. | Session 36: Quantum Characterization, Verification, and Validation |

656 | Simultaneous Gate Set Tomography | Blume-Kohout, Robin; Clark, Susan; Hashim, Akel; Hogle, Craig; Lobser, Daniel; Naik, Ravi; Proctor, Timothy; Rudinger, Kenneth; Santiago, David; Siddiqi, Irfan; Young, Kevin | In this talk we introduce simultaneous gate set tomography, a protocol for detailed characterization of crosstalk errors. | Session 36: Quantum Characterization, Verification, and Validation |

657 | Increasing Quantum Volume on a superconducting quantum computing system | Jurcevic, Petar; Javadi, Ali; Bishop, Lev; Lauer, Isaac; Bogorin, Daniela; Brink, Markus; Capelluto, Lauren; Gunluk, Oktay; Itoko, Toshinari; Kanazawa, Naoki; Kandala, Abhinav; Keefe, George; Krsulich, Kevin; Landers, William; Lewandowski, Eric; McClure, Douglas; Nannicini, Giacomo; Narasgond, Adinath; Nayfeh, Hasan; Pritchett, Emily; Rothwel, Mary Beth; Srinivasan, Srikanth; Sundaresan, Neereja; Cindy Wang, Cindy Wang; Wei, Ken | We improve the quality of quantum circuits on superconducting quantum computing systems, as measured by the quantum volume, with a combination of dynamical decoupling, compiler optimizations, shorter two-qubit gates, and excited state promoted readout. | Session 36: Quantum Characterization, Verification, and Validation |

658 | Experimentally accrediting the outputs of noisy quantum computers | Ferracin, Samuele; Merkel, Seth; Datta, Animesh | We thus demonstrate a scalable and reliable method to ascertain the correctness of the outputs of noisy quantum computers. | Session 36: Quantum Characterization, Verification, and Validation |

659 | Scalable evaluation of quantum-circuit error loss using Clifford sampling | Wang, Zhen; Chen, Yanzhu; Song, Zixuan; Qin, Dayue; Li, Hekang; Guo, Qiujiang; Wang, Haohua; Song, Chao; Li, Ying | A major challenge in developing quantum computing technologies is to accomplish high precision tasks by utilizing multiplex optimization approaches. | Session 36: Quantum Characterization, Verification, and Validation |

660 | Scalable and targeted benchmarking of quantum computers | Proctor, Timothy; Rudinger, Kenneth; Sarovar, Mohan; Nielsen, Erik; Young, Kevin; Blume-Kohout, Robin | In this talk we will present scalable, holistic, and flexible benchmarking techniques, built on “mirror circuits”, that can efficiently test the capabilities of any programmable quantum computer. | Session 36: Quantum Characterization, Verification, and Validation |

661 | An application benchmark for fermionic quantum simulations | Dallaire-Demers, Pierre-Luc; Stechly, Michal; Gonthier, Jerome; Toussaint Bashige, Ntwali; Romero, Jhonathan; Cao, Yudong | Here we propose using the one-dimensional Fermi-Hubbard model as an application benchmark for variational quantum simulations on near-term quantum devices. | Session 36: Quantum Characterization, Verification, and Validation |

662 | Randomized analog verification for analog quantum simulators and gate-based quantum devices | Shaffer, Ryan; Ren, Hang; Megidish, Eli; Broz, Joseph; Chen, Wei-Ting; Haeffner, Hartmut | We introduce an experimentally-motivated technique for randomized analog verification (RAV) of quantum devices. | Session 36: Quantum Characterization, Verification, and Validation |

663 | A general framework for randomized benchmarking | Helsen, Jonas; Roth, Ingo; Onorati, Emilio; Werner, Albert; Eisert, Jens | In this work, we develop a comprehensive framework of RB, general enough to encompass almost all known RB protocols. | Session 36: Quantum Characterization, Verification, and Validation |

664 | Characterizing and mitigating errors in large quantum system | Sheldon, Sarah | In this talk I will discuss demonstrations that mark progress in our understanding of noise and mitigation of errors. | Session 36: Quantum Characterization, Verification, and Validation |

665 | Model-based characterization on 10 qubits | Nielsen, Erik; Proctor, Timothy; Rudinger, Kenneth; Young, Kevin; Blume-Kohout, Robin | In this talk, we discuss the necessary tradeoffs between the number of model parameters, the depth of test circuits, and the precision of the result. | Session 36: Quantum Characterization, Verification, and Validation |

666 | Wildcard error: Quantifying unmodeled errors in quantum processors | Blume-Kohout, Robin; Rudinger, Kenneth; Nielsen, Erik; Proctor, Timothy; Young, Kevin | Error models for quantum computing processors describe their deviation from ideal behavior and predict the consequences in applications. | Session 36: Quantum Characterization, Verification, and Validation |

667 | Frame-based filter-function formalism for quantum characterization and control – Part II. Noise-tailored gate design | Chalermpusitarak, Teerawat; Tonekaboni, Behnam; Wang, Yuanlong; Norris, Leigh; Viola, Lorenza; paz-silva, gerardo | We present the model-reduction properties of the formalism by showing only a minimal loss of performance when compared to the (unrealistic) scenario in which full information about the open quantum system is available. | Session 36: Quantum Characterization, Verification, and Validation |

668 | Qutrit Randomized Benchmarking on a Transmon Quantum Processor | Morvan, Alexis; Ramasesh, Vinay; Blok, Machiel; Kreikebaum, John Mark; O’Brien, Kevin; Chen, Larry; Naik, Ravi; Mitchell, Brad; Santiago, David; Siddiqi, Irfan | In this talk, we present a scheme to generalize Randomized Benchmarking (RB) protocols to qutrits, and we experimentally implement them on a 5-transmon processor. | Session 36: Quantum Characterization, Verification, and Validation |

669 | Using Grover’s search algorithm to test state-of-the-art quantum platforms | Geyko, Vasily; Castelli, Alessandro; Porter, Max; Joseph, Ilon; Shi, Yuan; Graziani, Frank; Libby, Stephen; Rosen, Yaniv; DuBois, Jonathan | In the present work, Grover’s search algorithm is used to study performance of state-of-the-art quantum platforms, such as LLNL Quantum Design and Integration Testbed (QuDIT), Rigetti and IBM-Q. | Session 36: Quantum Characterization, Verification, and Validation |

670 | Experimental robust self-testing of the state generated by a quantum network | Agresti, Iris; Polacchi, Beatrice; Poderini, Davide; Polino, Emanuele; Suprano, Alessia; Supic, Ivan; Bowles, Joseph; Carvacho, Gonzalo; Cavalcanti, Daniel; Sciarrino, Fabio | In this work, we deal with the verification that the state generated by a quantum network corresponds to the desired target, with no assumptions on the adopted experimental platform, i.e. device-independently. | Session 36: Quantum Characterization, Verification, and Validation |

671 | Measuring the Quality of Boson Samplers in the Sparse Regime | Renema, Jelmer; Wang, Hui; Qin, Jian; You, Xiang; Lu, Chao-Yang; Pan, Jian-Wei | In this work, we accomplish this for boson sampling [2], where the task is to sample from the output distribution of photons in a large linear optical network in the number basis. | Session 36: Quantum Characterization, Verification, and Validation |

672 | Truncated moment sequences and a solution to the channel separability problem | Milazzo, Nadia; Braun, Daniel; Giraud, Olivier | To understand how entanglement evolves under physical operations acting on quantum states, we consider the problem of separability of quantum channels via the Choi matrix representation. | Session 36: Quantum Characterization, Verification, and Validation |

673 | Hamiltonian Meta-Learning | Bienias, Przemyslaw; Seif, Alireza; Hafezi, Mohammad; Titum, Paraj; Linke, Norbert; Zhang, Jiehang | Here, we assume a model for the noisy evolution of a quantum system, and by using a machine learning technique known as meta-learning to train an optimizer that finds model parameters with less resources than other gradient-based optimization algorithms. | Session 36: Quantum Characterization, Verification, and Validation |

674 | Tomography and characterization of harmonic oscillator systems | Flühmann, Christa; Elder, Salvatore; Eickbusch, Alec; Devoret, Michel; Home, Jonathan; Schoelkopf, Robert | In this talk I will discuss experimental techniques to characterize extended quantum harmonic oscillator states, focusing on measurements of the Wigner characteristic function. | Session 36: Quantum Characterization, Verification, and Validation |

675 | Optimal state tomography by measuring the qubit of a qubit-qutrit system | Ivanova-Rohling, Violeta; Burkard, Guido; Rohling, Niklas | We formulate the search for the most efficient QST scheme as a high-dimensional optimization problem and approach this problem numerically as we did previously for QST schemes with rank-1 measurement operators [2]. | Session 36: Quantum Characterization, Verification, and Validation |

676 | Hamiltonian Tomography via Quantum Quench | Li, Zhi; Zou, Liujun; Hsieh, Timothy | We show that it is possible to uniquely reconstruct a generic many-body local Hamiltonian from a single pair of initial and final states related by time evolution with the Hamiltonian. | Session 36: Quantum Characterization, Verification, and Validation |

677 | Frame-Based Filter-Function Formalism for Quantum Characterization and Control | Chalermpusitarak, Teerawat; Tonekaboni, Behnam; Wang, Yuanlong; Norris, Leigh; Viola, Lorenza; Paz Silva, Gerardo | We introduce a new framework for resource-efficient characterization and control of non-Markovian open quantum systems, which allows for the integration of given, experimentally motivated, control capabilities and constraints. | Session 36: Quantum Characterization, Verification, and Validation |

678 | Pauli gate error amplification for sophisticated quantum gate calibration | Kentaro, Heya; Kanazawa, Naoki | In this work we demonstrate a novel echo sequence generation technique that enables us to amplify any small Pauli error term in any target Pauli gate. | Session 36: Quantum Characterization, Verification, and Validation |

679 | Characterizing Control of Superconducting Qutrits by Randomized Benchmarking | Kononenko, Michal; Yurtalan, Muhammet Ali; Shi, Jiahao; Ashhab, Sahel; Lupascu, Adrian | We present experimental results for control of a qutrit implemented in the lowest three levels of a capacitively-shunted flux-biased superconducting circuit. | Session 36: Quantum Characterization, Verification, and Validation |

680 | High speed calibration and characterization of superconducting qubits without qubit reset | Werninghaus, Max; Egger, Daniel; Filipp, Stefan | We present a methodology to collect data from superconducting qubits using a highly elevated measurement rate by omitting the qubit reset mechanism. | Session 36: Quantum Characterization, Verification, and Validation |

681 | Characterizing mid-circuit measurements with a new form of gate set tomography part 2: Experiment | Ribeill, Guilhem; Ware, Matthew; Govia, Luke; Rudinger, Kenneth; Proctor, Timothy; Ohki, Thomas | To that end, we demonstrate the use of an extension to gate set tomography (GST), a highly accurate protocol for diagnosing quantum processes, to characterize intermediate measurements on a superconducting transmon qubit. | Session 36: Quantum Characterization, Verification, and Validation |

682 | Demonstration of non-Markovian process characterisation and control on a quantum processor | White, Gregory; Hill, Charles; Pollock, Felix; Hollenberg, Lloyd; Modi, Kavan | Here, we develop and experimentally test a generalisation of quantum process tomography specifically for this problem. | Session 36: Quantum Characterization, Verification, and Validation |

683 | Quantum-tailored machine-learning characterization of quantum processors | Genois, Elie; Di Paolo, Agustin; Stevenson, Noah; Koolstra, Gerwin; Hashim, Akel; Siddiqi, Irfan; Blais, Alexandre; Gross, Jonathan | Here, we introduce a machine-learning architecture for inferring and interpreting the dynamics of a quantum device from time-series measurement data. | Session 36: Quantum Characterization, Verification, and Validation |

684 | Two-qubit noise cross-correlation spectroscopy of electronic spins in diamond | Sun, Won Kyu Calvin; Cappellaro, Paola | As the first step to address this, the theory of two-qubit noise spectroscopy (2QNS) was proposed to characterize such cross-correlations in the dephasing noise across spatially separated qubits. | Session 36: Quantum Characterization, Verification, and Validation |

685 | Model-based Qubit Noise Spectroscopy | Watson, Christopher; Schultz, Kevin; Murphy, Andrew; Quiroz, Gregory; Sweeney, Timothy | Classically, model-based techniques are well studied, but they have not yet been employed in qubit noise spectroscopy (QNS). | Session 36: Quantum Characterization, Verification, and Validation |

686 | Random Pulse Sequences for Qubit Noise Spectroscopy | Huang, Kaixin; Seif Tabrizi, Seyed Alireza; Hafezi, Mohammad; Liu, Yi-Kai | Here we describe an alternative method for quickly and approximately characterizing S(w). | Session 36: Quantum Characterization, Verification, and Validation |

687 | Constructing U(1) gauge symmetry in electronic circuits | Riechert, Hannes; Bretheau, Landry; Jendrzejewski, Fred | Here, we present an electronic circuit described by a lattice Hamiltonian with local U(1) symmetry and explore the extent to which a classical physical simulator in the form of an electronic circuit might be useful as a stepping stone for lattice gauge theories like SU(2). | Session 36: Quantum Characterization, Verification, and Validation |

688 | Maximal entropy approach for quantum state tomography | Gupta, Rishabh; Xia, Rongxin; Levine, Raphael; Kais, Sabre | Here, we propose an alternative approach to quantum tomography, based on the maximal information entropy, that can predict the values of unknown observables based on the available mean measurement data. | Session 36: Quantum Characterization, Verification, and Validation |

689 | Robust phase estimation for two-qubit gates | Marinoff, Benjamin; Combes, Joshua; Rubin, Nicholas; Gulshen, Kyle | In this talk we present protocols that allow you to robustly tune up arbitrary two qubit gates with high accuracy. | Session 36: Quantum Characterization, Verification, and Validation |

690 | Characterizing mid-circuit measurements with a new form of gate set tomography part 1: Theory | Rudinger, Kenneth; Proctor, Timothy; Nielsen, Erik; Ribeill, Guilhem; Ware, Matthew; Govia, Luke; Ohki, Thomas; Young, Kevin; Blume-Kohout, Robin | We will describe this extension and demonstrate its success in simulations. | Session 36: Quantum Characterization, Verification, and Validation |

691 | Tracking Non-Markovian Quantum Trajectories of a Superconducting Qubit from a Finite-Memory Bath | Stevenson, Noah; Koolstra, Gerwin; Siva, Karthik; Naik, Ravi; Livingston, William; Lotfallahzadeh Barzili, Shiva; Dressel, Justin; Siddiqi, Irfan | We use quantum state tracking with continuous weak measurement to experimentally investigate non-Markovianity in a transmon qubit strongly coupled to an unmonitored bath qubit via a cross-resonance interaction. | Session 36: Quantum Characterization, Verification, and Validation |

692 | Reconstructing Transmon State Trajectories Outside the Bad-Cavity Regime using a Neural Network Filter | Lotfallahzadeh Barzili, Shiva; Koolstra, Gerwin; Stevenson, Noah; Greenfield, Sacha; Burns, Lucas; Siva, Karthik; Livingston, William; Hashim, Akel; Siddiqi, Irfan; Dressel, Justin | In this work, we experimentally investigate driven qubit dynamics outside the steady-state and bad-cavity regime and demonstrate that a recurrent neural network (RNN) accurately reconstruct the reduced qubit-state trajectories with time-dependent parameters. | Session 36: Quantum Characterization, Verification, and Validation |

693 | The Power of Adiabatic Quantum Computation with No Sign Problem | Hastings, Matthew | In this talk, I’ll discuss what happens when one considers adiabatic evolution of such Hamiltonians, and show that they still have some power that cannot be efficiently simulated on a classical computer; to be precise and formal, I’ll show this "relative to an oracle", which I will explain. | Session 37: Quantum Computing Algorithms |

694 | Quantum Algorithm for Simulating Hamiltonian Dynamics with an Off-diagonal Series Expansion | Hen, Itay; Kalev, Amir | We propose an efficient quantum algorithm for simulating the dynamics of general Hamiltonian systems. | Session 37: Quantum Computing Algorithms |

695 | Shortcuts to Adiabaticity in Digitized Adiabatic Quantum Computing | Hegade, Narendra; Paul, Koushik; Ding, Yongcheng; Sanz, Mikel; Albarrán-Arriagada, Francisco; Solano, Enrique; Chen, Xi | In this work, we show the applicability of CD driving to enhance the digitized adiabatic quantum computing paradigm in terms of fidelity and total simulation time. | Session 37: Quantum Computing Algorithms |

696 | Quantum linear system solver based on continuous and discrete adiabatic quantum computing | An, Dong; Lin, Lin | We demonstrate that with an optimally tuned scheduling function, adiabatic quantum computing (AQC) can solve a quantum linear system problem with O(κ*poly(log(κN/ε))) complexity, where κ is the condition number, N is the dimension of the linear system, and ε is the desired level of errors. | Session 37: Quantum Computing Algorithms |

697 | Efficient step-merged quantum imaginary time evolution algorithm for quantum chemistry | Gomes, Niladri; Zhang, Feng; Berthusen, Noah; Wang, Cai-Zhuang; Ho, Kai-Ming; Orth, Peter; Yao, Yongxin | We develop a resource efficient step-merged quantum imaginary time evolution approach (smQITE) to solve for the ground state of a Hamiltonian on quantum computers. | Session 37: Quantum Computing Algorithms |

698 | Quantum Computation of Eigenvalues within Target Intervals | Jensen, Phillip; Kristensen, Lasse; Kottmann, Jakob; Aspuru-Guzik, Alan | In this study, we propose a quantum algorithm that samples the set of energies within a target energy-interval without requiring good approximations of the target energy-eigenstates. | Session 37: Quantum Computing Algorithms |

699 | The importance of the spectral gap in estimating ground-state energies | Deshpande, Abhinav; Gorshkov, Alexey; Fefferman, Bill | In this work, we make progress on this question by considering the precise regime, in which one estimates the ground-state energy to within inverse-exponential precision. | Session 37: Quantum Computing Algorithms |

700 | Enhancing the Quantum Linear Systems Algorithm using Richardson Extrapolation | Carrera Vazquez, Almudena; Hiptmair, Ralf; Woerner, Stefan | We present a quantum algorithm to solve systems of linear equations of the form Αx=b, where Α is a tridiagonal Toeplitz matrix and b results from discretizing an analytic function, with a circuit complexity of polylog(κ, 1/ε, N), where N denotes the number of equations, ε the accuracy, and κ the condition number. | Session 37: Quantum Computing Algorithms |

701 | Lanczos recursion on a quantum computer for the Green’s function | Baker, Thomas | The technique of quantum counting is used to obtain coefficients from a Lanczos recursion from a single ground-state wavefunction on the quantum computer. | Session 37: Quantum Computing Algorithms |

702 | The ground state phases of the disordered Bose-Hubbard model with attractive interactions | Mansikkamäki, Olli; Silveri, Matti | In this work we describe the ground state phases of the disordered Bose-Hubbard model with attractive interactions. | Session 37: Quantum Computing Algorithms |

703 | Adiabatic evolution to a Fermi Liquid on near-term quantum computers | Gyawali, Gaurav; Lawler, Michael | We thus propose studies that can be done on near-term quantum computers to enhance our understanding of Fermi Liquid theory. | Session 37: Quantum Computing Algorithms |

704 | Phase cancellation diagonalization method: A general approach to non-orthogonal basis sets for quantum devices | Klymko, Katherine; Mejuto Zaera, Carlos; Wudarski, Filip; Urbanek, Miroslav; Cotton, Stephen; De Jong, Wibe; Tubman, Norm | We demonstrate our approach numerically over a range of systems, both in classical simulations (for LiH and Cr2) and on quantum hardware (for the transverse field Ising model). | Session 37: Quantum Computing Algorithms |

705 | A Quantum Algorithm for String Matching | Niroula, Pradeep; Nam, Yunseong | Here, we present an explicit, circuit-level implementation of a quantum pattern-matching algorithm that matches a search string (pattern) of length M inside a longer text of length N. | Session 37: Quantum Computing Algorithms |

706 | Reducing the classical complexity of boson sampling via algebraic graph theory | Doty, Owen | In this work, we make use of these ideas in algebraic graph theory to explore the intriguing possibility that boson sampling probabilities could be efficiently computed classically for a subset of possible optical elements. | Session 37: Quantum Computing Algorithms |

707 | Quantum Hypothesis Testing for Non-Abelian Representations | Rossi, Zane; Chuang, Isaac | Specifically this work addresses the problem of distinguishing multiple unitary quantum channels in the serial adaptive query model under the assumption of known, non-trivial algebraic relations between them. | Session 37: Quantum Computing Algorithms |

708 | Quantum Legendre-Fenchel transform | Sutter, David; Nannicini, Giacomo; Sutter, Tobias; Woerner, Stefan | We present a quantum algorithm to compute the discrete Legendre-Fenchel transform. | Session 37: Quantum Computing Algorithms |

709 | Quantum Algorithms for Solving Ordinary Differential Equations | Zanger, Benjamin; Mendl, Christian; Schulz, Martin; Schreiber, Martin | We consider two approaches: (i) basis encoding and fixed-point arithmetic on a digital quantum computer, and (ii) representing and solving high-order Runge-Kutta methods as optimization problems on quantum annealers. | Session 37: Quantum Computing Algorithms |

710 | Solving Black Scholes PDE with a quantum computer | Conde, Javier Gonzalez; Rodriguez-Rozas, Angel; Solano, Enrique; Sanz, Mikel | We present a digital quantum algorithm with exponential speed-up to solve the partial differential equation of the model in the case of vanilla options, showing a feasible approach to price financial derivatives on a digital quantum computer by Hamiltonian simulation techniques. | Session 37: Quantum Computing Algorithms |

711 | Quantum Computing for Constraint Programming | Booth, Kyle; O’Gorman, Bryan; Marshall, Jeffrey; Hadfield, Stuart; Rieffel, Eleanor | We introduce a quantum-accelerated filtering algorithm for the AllDifferent global constraint, leveraging quantum algorithms for graph problems, and demonstrate its applicability in accelerating other global constraints with a similar structure. | Session 37: Quantum Computing Algorithms |

712 | Space-efficient binary optimization for variational quantum computing | Zimboras, Zoltan; Glos, Adam; Krawiec, Aleksandra | In this paper, we show that it is possible to greatly reduce the number of qubits needed for the Traveling Salesman Problem (TSP), a paradigmatic optimization task, at the cost of having deeper variational circuits. | Session 37: Quantum Computing Algorithms |

713 | Low Overhead Universality Using Z Gates in a Uniform Constant X Field on a 1D Chain | Barch, Brian; Mohseninia, Razieh; Zanardi, Paolo; Lidar, Daniel | We show that the method of quantum computation defined by applying Z-diagonal Hamiltonians in the presence of a uniform and constant external X field (as motivated, e.g., by quantum annealing using flux qubits) achieves universal quantum computation. | Session 37: Quantum Computing Algorithms |

714 | Iterative Optimizations to Quantum Phase Estimation and Related Algorithms | Johnstun, Scott; Van Huele, Jean-Francois | We present results for both simulations and actual implementation on IBM quantum computers. | Session 37: Quantum Computing Algorithms |

715 | Symmetries, Graph Properties, and Quantum Speedups | Ben-David, Shalev; Childs, Andrew; Gilyen, Andras; Kretschmer, William; Podder, Supartha; Wang, Daochen | In this work, we prove that hypergraph symmetries in the adjacency matrix model allow at most a polynomial separation between randomized and quantum query complexities. | Session 37: Quantum Computing Algorithms |

716 | Quantum state verification in the quantum linear systems problem | Somma, Rolando; Subasi, Yigit | We analyze the complexity of quantum state verification in the context of solving systems of linear equations of the form Ax=b. | Session 37: Quantum Computing Algorithms |

717 | Compilation of Fault-Tolerant Quantum Heuristics for Combinatorial Optimization | Sanders, Yuval; Berry, Dominic; Costa, Pedro; Tessler, Louis; Wiebe, Nathan; Gidney, Craig; Neven, Hartmut; Babbush, Ryan | Here we explore which heuristic-based quantum algorithms for combinatorial optimization are practical on a small fault-tolerant quantum computer. | Session 37: Quantum Computing Algorithms |

718 | The Meta-Variational Quantum Eigensolver (Meta-VQE): Learning energy profiles of parameterized Hamiltonians for quantum simulation | Cervera-Lierta, Alba; Kottmann, Jakob; Aspuru-Guzik, Alan | We present the meta-VQE, an algorithm capable to learn the ground state energy profile of a parametrized Hamiltonian. | Session 37: Quantum Computing Algorithms |

719 | ctrl-VQE: Fast variational quantum eigensolver with gate-free state preparation | Meitei, Oinam; Gard, Bryan; Barron, George; Pappas, David; Economou, Sophia; Barnes, Edwin; Mayhall, Nicholas | In this work, we propose an alternative algorithm where the quantum circuit used for state preparation is removed entirely and replaced by a quantum control routine which variationally shapes a pulse to drive the initial Hartree-Fock state to the full CI target state. | Session 37: Quantum Computing Algorithms |

720 | Mutual information-assisted Adaptive Variational Quantum Eigensolver Ansatz Construction | Zhang, Zi-Jian; Kyaw, Thi Ha; Kottmann, Jakob; Degroote, Matthias; Aspuru-Guzik, Alán | In this work, we propose a way to construct entangler pools with reduced size for those algorithms by leveraging classical algorithms. | Session 37: Quantum Computing Algorithms |

721 | Variational Quantum Algorithm for Coarse Grained Atomistic Modelling | Anderson, Lewis; Kiffner, Martin; Crain, Jason; Jaksch, Dieter | In this work, we propose a novel VQA to calculate the ground state of interacting molecules in condensed phase systems based on the classical method of electronic coarse graining. | Session 37: Quantum Computing Algorithms |

722 | Contextual Subspace Variational Quantum Eigensolver | Kirby, William; Tranter, Andrew; Love, Peter | We describe contextual subspace variational quantum eigensolver (CS-VQE), an approximation method based on standard VQE that can be adjusted to use any number of qubits to approximately simulate a given Hamiltonian. | Session 37: Quantum Computing Algorithms |

723 | Benchmarking Adaptive Variational Quantum Eigensolvers | Claudino, Daniel; Wright, Jerimiah; McCaskey, Alexander; Humble, Travis | In this work we provide a comprehensive benchmark of the adaptive derivative-assembled pseudo-Trotter (ADAPT) VQE algorithm for the H 2, NaH, and KH molecules, assessing the aptness of the prepared state and its corresponding energy compared to exact diagonalization, which are accompanied by the respective measurement and circuit depth estimates. | Session 37: Quantum Computing Algorithms |

724 | An Exactly-Solvable Model as a Benchmark for VQE | Robbins, Ken; Love, Peter | By exploiting the algebraic structure of the LMG Hamiltonian we use the Bethe ansatz to design a state-preparation quantum circuit to generate ansatz states for the LMG. | Session 37: Quantum Computing Algorithms |

725 | An optimal quantum sampling regression algorithm for variational eigensolving in the low qubit number regime | Rivero, Pedro; Cloet, Ian; Sullivan, Zack | Our goal with this work is to reproduce the spontaneous symmetry breaking mechanism characteristic of these models, which in turn is responsible for the generation of dressed mass in a number of quantum many-body systems. | Session 37: Quantum Computing Algorithms |

726 | Implementation of Measurement Reduction for the Variational Quantum Eigensolver | Ralli, Alexis; Love, Peter; Coveney, Peter; Tranter, Andrew | Here we investigate two different implementations of the unitary partitioning measurement reduction strategy achieved by (1) a sequence of rotations and (2) a linear combination of unitaries (LCU). | Session 37: Quantum Computing Algorithms |

727 | Variational Quantum Algorithm for Quantum Sensor Evaluation | Beckey, Jacob; Sone, Akira; Cerezo de la Roca, Marco; Coles, Patrick | In this presentation, we present two recent works addressing this issue. | Session 37: Quantum Computing Algorithms |

728 | Scattering in the Ising Model with the Quantum Lanczos Algorithm | Yeter Aydeniz, Kubra; Siopsis, George; Pooser, Raphael | We use the quantum Lanczos algorithm to obtain all energy levels and corresponding eigenstates of the system. | Session 37: Quantum Computing Algorithms |

729 | Generic constructin of quantum circuits for nonunitary operations: linear-response functions of molecules | Matsushita, Yu-ichiro; Kosugi, Taichi | In this study, we propose a scheme for the construction of a quantum circuit for an arbitrary nonunitary operator given as a linear combination of unitary operators. | Session 37: Quantum Computing Algorithms |

730 | State preparation for molecular Hamiltonians with the quantum alternating operator ansatz (QAOA) | Tubman, Norm; Hogg, Tad; Cotton, Stephen; Hadfield, Stuart | This work explores the use of the quantum alternating operator ansatz (QAOA) as a algorithm for state preparation for chemical systems. | Session 37: Quantum Computing Algorithms |

731 | Scalable Variational Ansatz for Quantum Many-Body Dynamics on Noisy Quantum Devices | Gomes, Niladri; Yao, Yongxin; Zhang, Feng; Wang, Cai-Zhuang; Iadecola, Thomas; Orth, Peter | In our work, we use a variational time-evolution algorithm to simulate time-dependent spin models. | Session 37: Quantum Computing Algorithms |

732 | Error-mitigated tensor network-based ansatz for a noisy quantum computer | Baek, Unpil; Huggins, William; Whaley, Birgitta | To tackle this challenge, we integrate the geometric structure of Deep Multiscale Entanglement Renormalization Ansatz (DMERA) circuits with the low-cost error mitigation, using fermionic parity symmetry verification, to simulate ground states of the Fermi-Hubbard model and the jellium model. | Session 37: Quantum Computing Algorithms |

733 | Ab Initio Molecular Dynamics on Quantum Computers | Fedorov, Dmitry; Otten, Matthew; Gray, Stephen; Alexeev, Yuri | In this work, we are exploring the possibility of simulation of the time evolution of molecular systems on quantum computers using the ab initio molecular dynamics (AIMD) approach. | Session 37: Quantum Computing Algorithms |

734 | Quantum algorithms for astrochemistry and atmospheric science: Calculating vibrational spectra. | Sawaya, Nicolas; Paesani, Francesco; Tabor, Daniel | Here we outline the previously unaddressed ways in which solving the vibrational spectroscopy problem is mathematically distinct from the electronic problem. | Session 37: Quantum Computing Algorithms |

735 | Simulating photosynthesis on an IBM quantum computer | Jaderberg, Ben; Eisfeld, Alexander; Mostame, Sarah | In this work, we look to simulate the inter-molecular site dynamics of the FMO complex using a digital quantum computer. | Session 37: Quantum Computing Algorithms |

736 | Band theory on a quantum computer | Sherbert, Kyle; Cerasoli, Frank; Buongiorno-Nardelli, Marco | We demonstrate a technique to perform band theory on a quantum computer. | Session 37: Quantum Computing Algorithms |

737 | Graph Optimization Perspective for Low-Depth Trotter-Suzuki Decomposition | Schmitz, Albert; Sawaya, Nicolas; Johri, Sonika; Matsuura, Anne | Though this is an NP-hard problem, we use this perspective to demonstrate the simplest heuristic, greedy search, and compare the resulting two-qubit gate count and circuit depth to more standard methods. | Session 37: Quantum Computing Algorithms |

738 | Operator Ordering Ambiguity in Trotterized Unitary Coupled Cluster Theory and How to Take Advantage of It | Grimsley, Harper; Economou, Sophia; Barnes, Edwin; Mayhall, Nicholas | We demonstrate that even after variationally optimizing these different parametrized ansatzë, one obtains dramatically different ground state energies, many of them superior to that of the un-Trotterized UCC energy. | Session 37: Quantum Computing Algorithms |

739 | Quantum Chaos and Trotterisation Thresholds in Digital Quantum Simulations | Kargi, Cahit; Henriques, Fabio; Sieberer, Lukas; Olsacher, Tobias; Hauke, Philipp; Heyl, Markus; Dehollain, Juan Pablo; Zoller, Peter; Langford, Nathan | Here, we numerically analyse several experimentally accessible digital simulation models, supporting and extending these predictions. | Session 37: Quantum Computing Algorithms |

740 | Randomizing multi-product formulas for improved Hamiltonian simulation | Faehrmann, Paul; Steudtner, Mark; Kueng, Richard; Kieferová, Mária; Eisert, Jens | In this work, we introduce a scheme for quantum simulation that unites the advantages of randomized compiling and higher-order linear-combination-of-unitaries (LCU) algorithms. | Session 37: Quantum Computing Algorithms |

741 | Quantum simulation via randomized product formulas: Low gate complexity with accuracy guarantees | Chen, Chi-Fang; Huang, Hsin-Yuan; Kueng, Richard; Tropp, Joel | This work provides a comprehensive analysis of a single realization of the random product formula produced by qDRIFT. | Session 37: Quantum Computing Algorithms |

742 | Nonlocal approximation toward implementation of quantum imaginary-time evolution method on NISQ devices | Nishi, Hirofumi; Kosugi, Taichi; Matsushita, Yu-ichiro | We propose two methods to overcome this problem [2]: the first is a nonlocal approximation method removing the locality condition imposed when transforming the imaginary-time evolution operator into a unitary operator in the QITE method; the second is a compression method of the quantum circuit for imaginary-time steps. | Session 37: Quantum Computing Algorithms |

743 | Creating and manipulating a Laughlin-type ν=1/3 fractional quantum Hall state on a quantum computer with linear depth circuits | Rahmani, Armin; Sung, Kevin; Putterman, Harald; Roushan, Pedram; Ghaemi, Pouyan; Jiang, Zhang | Here we present an efficient quantum algorithm to generate an equivalent many-body state to Laughlin’s ν=1/3 fractional quantum Hall state on a digitized quantum computer. | Session 37: Quantum Computing Algorithms |

744 | Collective Neutrino Oscillations on a Quantum Computer | Yeter Aydeniz, Kubra; Bangar, Shikha; Siopsis, George; Pooser, Raphael | In this study, we use the quantum Lanczos (QLanczos) algorithm to calculate the eigenvalues and eigenstates of a collective neutrino system as a function of the radial dependence of the coupling strength of neutrino interactions on IBM Q quantum hardware. | Session 37: Quantum Computing Algorithms |

745 | Toward scalable simulations of lattice gauge theories on quantum computers | Mazzola, Guglielmo; Mathis, Simon; Mazzola, Giulia; Tavernelli, Ivano | In this talk I will present a framework for simulating a discretized U(1) gauge theory with dynamical matter on a digital quantum computer, that is scalable towards an arbitrary number of spacial dimensions. | Session 37: Quantum Computing Algorithms |

746 | Toward Quantum Simulations of Z2 Gauge Theory in 1+1-Dimensions Without State Preparation | Gustafson, Erik; Lamm, Henry | In this work, we show how classical sampling coupled with projection operators can be used to compute Minkowski matrix elements on a quantum computer without explicitly preparing these strongly-coupled states on the quantum computer. | Session 37: Quantum Computing Algorithms |

747 | Simulating phi-4 scalar field on quantum computers | Li, Andy C. Y.; Macridin, Alexandru; Mrenna, Stephen; Spentzouris, Panagiotis | We present a quantum algorithm to prepare the ground state of a lattice scalar-field model with a quartic interaction. | Session 37: Quantum Computing Algorithms |

748 | Near-Optimal Ground State Preparation | Tong, Yu; Lin, Lin | With this assumption we propose a hybrid quantum-classical algorithm to estimate the ground energy, where the dependence of the number of queries to the initial state on the desired precision is exponentially improved compared to current state-of-the-art algorithms. | Session 37: Quantum Computing Algorithms |

749 | Measurement-based algorithms for quantum simulation of many-body fermionic systems | Lee, Woo-Ram; Qin, Zhangjie; Raussendorf, Robert; Sela, Eran; Scarola, Vito | In this talk, I will discuss the implementation of mappings between spins and many-body fermionic systems in the context of MBQC. | Session 37: Quantum Computing Algorithms |

750 | Variational Hamiltonian Diagonalization for Dynamical Quantum Simulation | Commeau, Benjamin; Cerezo, Marco; Holmes, Zoe; Cincio, Lukasz; Coles, Patrick; Sornborger, Andrew | In this work, we aim to make variational dynamical simulation practical and near-term. | Session 37: Quantum Computing Algorithms |

751 | Quantum-Classical Simulation of Dynamical Mean-Field Theory Using Coupled-Cluster Methods | Keen, Trevor; Peng, Bo; Kowalski, Karol; Lougovski, Pavel; Johnston, Steven | We propose a new method of calculating Green’s functions on a quantum computer in the time domain for condensed matter applications using coupled cluster methods. | Session 37: Quantum Computing Algorithms |

752 | Coherent Protocols for Distinguishing Noisy Quantum Channels | Yu, Jeffery; Rossi, Zane; Sugiura, Sho; Chuang, Isaac | We show that if the coherent protocol is used, then for narrow distributions the number of queries required to achieve a particular inference confidence is reduced compared to simple Helstrom measurements. | Session 37: Quantum Computing Algorithms |

753 | Quantum optimal control on many-body states in a Jaynes-Cummings lattice | Parajuli, Prabin; Tian, Lin | Here we use this technique to study the robust generation of quantum many-body states in a Jaynes Cummings (JC) lattice near quantum critical regions. | Session 37: Quantum Computing Algorithms |

754 | Robust Preparation of Many-body Ground States in Jaynes-Cummings Lattices | Cai, Kang; Parajuli, Prabin; Long, Guilu; Wong, Chee Wei; Tian, Lin | Here we present an approach for the robust preparation of many-body ground states in a finite-sized JC lattice. | Session 37: Quantum Computing Algorithms |

755 | Bayesian inference with engineered likelihood functions for robust amplitude estimation | Wang, Guoming; Enshan Koh, Dax; Johnson, Peter; Cao, Yudong | Here we propose methods that take advantage of the available quantum coherence to maximally enhance the power of sampling on noisy quantum devices, reducing measurement number and runtime compared to VQE. | Session 37: Quantum Computing Algorithms |

756 | Constant Depth Exact Time Evolution of Spin Systems based on Cartan Decomposition | Kökcü, Efekan; Steckman, Thomas; Freericks, James; Dumitrescu, Eugen; Kemper, Alexander | Here we present an algorithm that enables exact time evolution for ordered and disordered spin models for a given time t with a fixed depth circuit. | Session 37: Quantum Computing Algorithms |

757 | Digital Heater: Engineering Thermal Distributions on Quantum Computers | Metcalf, Mekena; Stone, Emma; Klymko, Katherine; Kemper, Alexander; Sarovar, Mohan; De Jong, Wibe | We develop a quantum algorithm that uses spectral combing with ancillary qubits that are on average in a thermal state. | Session 37: Quantum Computing Algorithms |

758 | Computing Free Energy with Fluctuation Relations on Quantum Computers | Bassman, Lindsay; Klymko, Katherine; Tubman, Norm; De Jong, Wibe | Here, we present a quantum algorithm based on the Jarzynski equality for computing free energies of quantum materials. | Session 37: Quantum Computing Algorithms |

759 | Resource Estimate for Quantum Many-Body Ground State Preparation on a Quantum Computer | Lemieux, Jessica; Duclos-Cianci, Guillaume; Senechal, David; Poulin, David | We present an estimate of the resources required to prepare the ground state of a quantum many-body system on a quantum computer. | Session 37: Quantum Computing Algorithms |

760 | Two Approaches to Quantum Simulation of Classical Dynamics | Joseph, Ilon; Castelli, Alessandro; Geyko, Vasily; Graziani, Frank; Libby, Stephen; Porter, Max; Rosen, Yaniv; Shi, Yuan; DuBois, Jonathan | There are two approaches to quantum simulation of nonlinear classical dynamics: (i) quantize the classical Hamiltonian and (ii) use the Koopman-von Neumann approach to reformulate the conservation of probability, the Liouville equation, as an equivalent Schrodinger equation with a unitary evolution operator. | Session 37: Quantum Computing Algorithms |

761 | Quantum Divide and Compute and its Application | Saleem, zain | We introduce a "Quantum Divide and Compute" technique that allows dividing a quantum circuit in smaller sub circuits that can run on devices with a limited number of qubits. | Session 37: Quantum Computing Algorithms |

762 | State-to-state fermionic mapping to quantum processors using a combinatoric representation | Metcalf, Mekena; Chamaki, Diana; Wiebe, Nathan; Parehk, Ojas; De Jong, Wibe | We develop algorithms for near-term and fault-tolerant devices while demonstrating the effectiveness of our technique by implementing the Variational Quantum Eigensolver for molecular Hamiltonians on a compressed basis. | Session 37: Quantum Computing Algorithms |

763 | Simulating Digital-Analog Quantum Computing on IQM chips – I | Taketani, Bruno; Pina Canelles, Vicente; Algaba, Manuel; Ponce, Mario; Sanz, Mikel; deVega, Inés; Solano, Enrique; Rönkkö, Jami; Bergholm, Ville; Tuorila, Jani; Ockeloen-Korppi, Caspar; Hassel, Juha; Möttönen, Mikko | We present a systematic approach to DAQC algorithm design based on the natural interactions implemented in IQM’s “Adonis” chip, proving that the DAQC paradigm is amenable to IQM’s current hardware architecture. | Session 38: Quantum Computing Architectures |

764 | A quantum state router based on parametrically driven photon exchange. | Zhou, Chao; Lu, Pinlei; Xia, Mingkang; Chien, Tzu-Chiao; Cao, Xi; Kaufman, Ryan; Mong, Roger; Pekker, David; Hatridge, Michael | We present a design that can realize long range couplings between qubits through a modular quantum router. | Session 38: Quantum Computing Architectures |

765 | Cryogenic Characterization of Low-frequency Noise Based on Cryo-CMOS: Impact of Interface Trap Density | Oka, Hiroshi; Matsukawa, Takashi; Kato, Kimihiko; Iizuka, Shota; Mizubayashi, Wataru; Endo, Kazuhiko; Yasuda, Tetsuji; Mori, Takahiro | Thus, we proposed low-frequency noise analysis based on cryo-CMOS to understand the coherence-time limiting factor of Si qubits. | Session 38: Quantum Computing Architectures |

766 | Mobility limiting factors in Si-MOSFETs fabricated with a full CMOS process | Camenzind, Timothy; Elsayed, Asser; Govoreanu, Bogdan; Kubicek, Stefan; Radu, Iuliana; Zumbuhl, Dominik | Here, we study the influence of various gate stacks on the density and mobility of both electrons and holes in Si-MOSFETs fabricated in a full CMOS process. | Session 38: Quantum Computing Architectures |

767 | Employing CMOS technology on silicon for a scalable electron-spin qubit architecture | Klos, Jan; Sun, Bin; Beyer, Jacob; Kindel, Sebastian; Hellmich, Lena; Knoch, Joachim; Schreiber, Lars | We propose a scalable qubit device fabricated by industry-compatible processes. | Session 38: Quantum Computing Architectures |

768 | Laser annealing for two-qubit gate error reduction in fixed frequency processor architectures | Zhang, Eric; Srinivasan, Srikanth; Sundaresan, Neereja; Bogorin, Daniela; Martin, Yves; Hertzberg, Jared; Timmerwilke, John; Pritchett, Emily; Yau, Jeng-Bang; Wang, Xinhui; Landers, William; Lewandowski, Eric; Narasgond, Adinath; Rosenblatt, Sami; Keefe, George; Lauer, Isaac; Rothwell, Mary Beth; Dial, Oliver; Orcutt, Jason; Brink, Markus; Chow, Jerry | We implement a scalable laser-based frequency trimming technique that has been implemented on processors at the 65-qubit scale, enabling low-error gates with average fidelities approaching 99%. | Session 38: Quantum Computing Architectures |

769 | Universal Quantum Circuitry: High-Fidelity Deutsch Gate and Toffoli Gate Protocols Using GaAs/InAs Quantum Dots | Bailey, Paul; Van Huele, Jean-Francois | We propose to incorporate two GaAs/InAs quantum dots in a larger circuit comprised of linear optical elements to create a spin-spin-photon polarization three-qubit Deutsch gate D(θ), where the parameter θ is tuned by rotating half-wave plates. | Session 38: Quantum Computing Architectures |

770 | Implementing a fast unbounded quantum fanout gate using power-law interactions | Guo, Andrew; Deshpande, Abhinav; Chu, Su-Kuan; Eldredge, Zachary; Bienias, Przemyslaw; Devulapalli, Dhruv; Su, Yuan; Childs, Andrew | Complementarily, we develop a technique to give a general lower bound, linear in the size of the system, on the time required to implement the QFT and the fanout gate in systems that are constrained by a linear light cone. | Session 38: Quantum Computing Architectures |

771 | Scaling Law in Large Quantum Devices with Dissipation | Watabe, Shohei; Serikow, Michael; Kawabata, Shiro; Zagoskin, Alexandre | In this talk, we present a statistical approach to such a description of large quantum systems. | Session 38: Quantum Computing Architectures |

772 | Simulating Digital-Analog Quantum Computing on IQM chips – II | Rönkkö, Jami; Bergholm, Ville; Tuorila, Jani; Heinsoo, Johannes; Ockeloen-Korppi, Caspar; Hassel, Juha; Möttönen, Mikko; Taketani, Bruno; Canelles, Vicente; Algaba, Manuel; Ponce, Mario; Sanz, Mikel; de Vega, Ines; Solano, Enrique | We present numerical simulations of DAQC circuits built around the "all-on" interaction Hamiltonian of IQM’s "Adonis" quantum processor and compare the results to purely digital (gate-model) circuits accomplishing the same computational task | Session 38: Quantum Computing Architectures |

773 | Micro-architecture of quantum information processor using planer packaging | Mukai, Hiroto; Sakata, Keiichi; Devitt, Simon; Frisk Kockum, Anton; Wang, Rui; Zhou, Yu; Nakajima, Yukito; Nori, Franco; Tsai, Jaw-Shen | In this talk, we present a revolutionary new large-scale micro-architecture that completely side-steps this issue. | Session 38: Quantum Computing Architectures |

774 | Efficient Hamiltonian programming in qubit arrays with nearest-neighbor couplings | Tsunoda, Takahiro; Bhole, Gaurav; Jones, Stephen; Jones, Jonathan; Leek, Peter | Here we present an efficient scheme to find near time-optimal solutions that can be applied to engineered qubit arrays with local connectivity for any number of qubits, indicating the potential for practical quantum computing in such systems. | Session 38: Quantum Computing Architectures |

775 | Development of the Quantum Scientific Computing Open User Testbed (QSCOUT) | Yale, Christopher; Blain, Matthew; Haltli, Raymond; Hogle, Craig; Landahl, Andrew; Lobser, Daniel; Pehr, Jessica; Revelle, Melissa; Ruzic, Brandon; Van Der Wall, Jay; Wilson, Joshua; Clark, Susan | Here, we present the experimental development of QSCOUT, along with design decisions and hardware details, the capabilities of the testbed, and opportunities for use of this platform. | Session 38: Quantum Computing Architectures |

776 | Using chaotic quantum maps as a test of current quantum computing hardware fidelity* | Porter, Max; Joseph, Ilon; Parker, Jeff; Castelli, Alessandro; Geyko, Vasily; Graziani, Frank; Libby, Stephen; Rosen, Yaniv; Shi, Yuan; DuBois, Jonathan | In this work, the dynamics of chaotic quantum maps is explored via simulation as a means to test the fidelity of emerging quantum computing hardware. | Session 38: Quantum Computing Architectures |

777 | A modular quantum computer based on a parametrically driven quantum state router | Lu, Pinlei; Zhou, Chao; Xia, Mingkang; Chien, Tzu-Chiao; Kaufman, Ryan; Cao, Xi; Pekker, David; Mong, Roger; Pfaff, Wolfgang; Hatridge, Michael | In this talk, we will demonstrate basic operations in our machine: transferring states and generating entanglement among the modules’ communication modes and qubits. | Session 38: Quantum Computing Architectures |

778 | Characterization of quantum states based on creation complexity | Hu, Zixuan; Kais, Sabre | The creation complexity of quantum states is closely related to the complexity of quantum circuits, which is crucial in developing efficient quantum algorithms that can outperform classical algorithms. | Session 38: Quantum Computing Architectures |

779 | Adapting 5G-telecom hardware for the control of quantum computers | Borgani, Riccardo; Tholen, Mats; Haviland, David | We describe the hardware modifications and firmware extensions needed for this adaptation. | Session 38: Quantum Computing Architectures |

780 | Spontaneous patametric down-conversion sources for boson sampling | van der Meer, Reinier; Renema, Jelmer; Brecht, Benjamin; silberhorn, Christine; Pinkse, Pepijn | In this work we show that an optimum exists where we can outperform a classical computer, using off-the-shelf parametric down-conversion photon sources. | Session 38: Quantum Computing Architectures |

781 | Generating nonclassical states for continuous-variable quantum computation Using Photon-Number Selective Phase Gates and Displacements | Kudra, Marina; Perez Lozano, Daniel; Scigliuzzo, Marco; Strandberg, Ingrid; Ahmed, Shahnawaz; Delsing, Per; Gasparinetti, Simone | We use gradient descent algorithm to optimize the parameters of the sequence, and characterize fidelities to the target state by Wigner tomography. | Session 38: Quantum Computing Architectures |

782 | Experimental demonstration of entangling gates across chips in a multi-core QPU | Gold, Alysson; Stockklauser, Anna; Reagor, Matt; Paquette, Jean-Philip; Bestwick, Andrew; Winkleblack, Cody James; Scharmann, Ben; Oruc, Feyza; Langley, Brandon | Towards these aims, we present here experimental results from a multi-core quantum processing unit: a 32-qubit platform formed from short-range interconnects across four 8-qubit chips. | Session 38: Quantum Computing Architectures |

783 | The Role of Computer Architecture in Advancing QC (and the Role of QC in Advancing Computer Architecture!) | Martonosi, Margaret | Computer Architecture research seeks to help close this gap by bringing expertise on optimizations and abstractions developed in decades of advances in classical computing. | Session 38: Quantum Computing Architectures |

784 | Quantum Optimal Control of Nuclear Spins in 87Sr for Quantum Logic with Qudits | Omanakuttan, Sivaprasad; Mitra, Anupam; Martin, Michael; Deutsch, Ivan | By employing nuclear spin magnetic resonance in the presence of a laser-induced nonlinear AC Stark shift, the system is controllable; we can design any SU(10) unitary matrix acting on the d=10 dimensional manifold of nuclear magnetic sublevels. | Session 38: Quantum Computing Architectures |

785 | Dynamical mitigation of errors due to non-negligible interactions in multi-qubit system | Deng, Xiu-Hao | We develop a framework including analytical protocol together with numerical method to dynamically mitigate such errors. | Session 38: Quantum Computing Architectures |

786 | Characterization of Parametric Entangling Gates on a Multi-Qubit Quantum Processor | Chen, Larry; Naik, Ravi; Kreikebaum, John Mark; Santiago, David; Siddiqi, Irfan | In this work, we experimentally investigate the sources of coherent error that limit the parametric gate fidelity in a multi-qubit device. | Session 38: Quantum Computing Architectures |

787 | Towards stabilizing many-body interacting flat-states in circuit QED | Smitham, Basil; Chiu, Christie; Mucci, Maria; Cao, Xi; Hatridge, Michael; Houck, Andrew | In this talk, we discuss experimental and theoretical progress towards realizing a circuit QED Lieb chain, a system with a gapped flat band that can be driven into a density wave state. | Session 38: Quantum Computing Architectures |

788 | Large-scale entanglement in superconducting quantum devices | Mooney, Gary; White, Gregory; Hill, Charles; Hollenberg, Lloyd | We demonstrate two forms of entanglement within IBM Quantum devices: entanglement in the sense of inseparability with fixed qubit bipartitions, and the stricter genuine multipartite entanglement (GME) which is the inability to express the state as a mixture of only product pure states. | Session 38: Quantum Computing Architectures |

789 | Constructing Qudits from Infinite Dimensional Oscillators by Coupling to Qubits | Liu, Yuan; Kearney, Matthew; Chuang, Isaac | This work suggests that the combination of a qubit and a bosonic system may serve as hardware-efficient quantum resources for quantum computation and memory. | Session 39: Quantum Computing with Continuous-Variable Systems |

790 | Modular bosonic subsystem codes | Pantaleoni, Giacomo; Baragiola, Ben; Menicucci, Nicolas | I introduce a formalism where a mode is divided into two virtual subsystems: a qubit and a mode. | Session 39: Quantum Computing with Continuous-Variable Systems |

791 | Quantum repeaters based on concatenated bosonic and discrete-variable quantum codes | Rozpedek, Filip; Noh, Kyungjoo; Xu, Qian; Guha, Saikat; Jiang, Liang | We propose a novel architecture of quantum-error-correction-based quantum repeaters that combines the techniques used in discrete and continuous variable quantum information. | Session 39: Quantum Computing with Continuous-Variable Systems |

792 | Improved speed limits for cavity-qubit operations using conditional displacements (Part 1) | Elder, Salvatore; Eickbusch, Alec; Flühmann, Christa; Ding, Zhenghao; Jha, Shantanu; Sivak, Volodymyr; Frattini, Nicholas; Devoret, Michel; Schoelkopf, Robert | In this two-part talk, we explore how displacements of the oscillator which are large on the scale of zero point fluctuations can generate an effective conditional displacement interaction [Campagne-Ibarcq et al., 2020], leading in turn to universal oscillator control with a speed limited by the oscillator drive strength rather than the strength of the oscillator-transmon coupling. | Session 39: Quantum Computing with Continuous-Variable Systems |

793 | Improved speed limits for cavity-qubit operations using conditional displacements (Part 2) | Eickbusch, Alec; Elder, Salvatore; Ding, Zhenghao; Jha, Shantanu; Sivak, Volodymyr; Frattini, Nicholas; Flühmann, Christa; Schoelkopf, Robert; Devoret, Michel | In this two-part talk, we explore how displacements of the oscillator which are large on the scale of zero point fluctuations can generate an effective conditional displacement interaction [Campagne-Ibarcq et al., 2020], leading in turn to universal oscillator control with a speed limited by the oscillator drive strength rather than the strength of the oscillator-transmon coupling. | Session 39: Quantum Computing with Continuous-Variable Systems |

794 | Bosonic codes for continuous-variable quantum computing | Baragiola, Ben | I will introduce the menagerie of bosonic codes, including a promising new class based on number-phase minimum uncertainty states, and highlight several cutting-edge experimental demonstrations. | Session 39: Quantum Computing with Continuous-Variable Systems |

795 | Universal Gate Set for Continuous-Variable Quantum Computation with Microwave Circuits | Hillmann, Timo; Quijandria Diaz, Isaac; Johansson, Göran; Ferraro, Alessandro; Gasparinetti, Simone; Ferrini, Giulia | We provide an explicit construction of a universal gate set for continuous-variable quantum computation with microwave circuits. | Session 39: Quantum Computing with Continuous-Variable Systems |

796 | Clifford gates for Gottesman-Kitaev-Preskill codes in superconducting circuits | Shaw, Mackenzie; Grimsmo, Arne | To this end, we present a simple superconducting two-mode coupler that allows all Clifford gates to be executed using a single piece of hardware. | Session 39: Quantum Computing with Continuous-Variable Systems |

797 | Microwave swap gates with a Kerr-cat ancilla | Pietikäinen, Iivari; Cernotik, Ondrej; Puri, Shruti; Filip, Radim; Girvin, Steven | We propose a new way of doing a controlled beam splitter with a SNAIL-based Kerr cat that is transparent to the dominant error channel. | Session 39: Quantum Computing with Continuous-Variable Systems |

798 | Continuous-variable Gate Teleportation and Bosonic-code Error Correction | Walshe, Blayney; Baragiola, Ben; Alexander, Rafael; Menicucci, Nicolas | We extend this protocol by replacing the TMSSs in the macronode wire with more general two-mode entangled states. | Session 39: Quantum Computing with Continuous-Variable Systems |

799 | Simulation of dissipative conical intersection reaction dynamics in a superconducting circuit | Wang, Christopher; Frattini, Nicholas; Chapman, Benjamin; Puri, Shruti; Girvin, Steven; Devoret, Michel; Schoelkopf, Robert | In this talk, we report on experimental progress towards simulating a CI Hamiltonian in a circuit with one nonlinear (electronic) and two linear (nuclear) modes. | Session 39: Quantum Computing with Continuous-Variable Systems |

800 | High Impedance multimode circuit QED | Leger, Sebastien; Puertas, Javier; Bharadwaj, Karthik; Dassonneville, Remy; Delaforce, Jovian; Foroughi, Farshad; Milchakov, Vladimir; Planat, Luca; Buisson, Olivier; Naud, Cécile; Guichard, Wiebke; florens, serge; Snyman, Izak; Basko, Denis; Roch, Nicolas | High Impedance multimode circuit QED | Session 39: Quantum Computing with Continuous-Variable Systems |

801 | Two dimensional multiphoton Quantum Walk in transverse momentum of light | Esposito, Chiara; Carvacho, Gonzalo; Barros, Mariana; Duran Hernandez, Andres; Cardano, Filippo; Spagnolo, Nicolò; Marrucci, Lorenzo; Sciarrino, Fabio | We present an innovative platform feasible for the realization of two-dimensional multiphoton QW in the transverse momentum of light. | Session 39: Quantum Computing with Continuous-Variable Systems |

802 | Towards quantum simulation of spin systems using continuous variable quantum devices | Annabestani, Razieh; Gupt, Brajesh; Roy Bardhan, Bhaskar | We study Bosonic representation of spin Ising model with the application of simulating two level systems using continuous variable quantum processors. | Session 40: Quantum Computing with Hybrid Quantum Dot Systems |

803 | Optimal control of the operating point of a single electron DQD coupled to a superconducting resonator | Reiher, Vincent; Bérubé-Lauzière, Yves | In this work, we use the GRAPE algorithm to quickly and reliably change the OP of such a qubit by dynamically changing its orbital energy and degree of hybridization, showing high fidelity even in the presence of decoherence. | Session 40: Quantum Computing with Hybrid Quantum Dot Systems |

804 | Triplet blockade in a Josephson junction with a double quantum dot | Pataki, Dávid; Steffensen, Gorm; Bouman, Daniel; Boross, Péter; Paaske, Jens; Geresdi, Attila; Palyi, Andras | I will present our theory results [1] on a Josephson junction with a double quantum dot. | Session 40: Quantum Computing with Hybrid Quantum Dot Systems |

805 | Dual feedback squid magnetometry for sensitive spin detection | Cochran, Josiah; Franco-Rivera, Giovanni; Chen, Lei; Wang, Zhen; Chiorescu, Irinel | A novel differential squid detection method for spin systems on a microwave waveguide is being developed at NHMFL. | Session 40: Quantum Computing with Hybrid Quantum Dot Systems |

806 | Coupling silicon spin qubits via a high-impedance superconducting resonator | Harvey-Collard, Patrick; Zheng, Guoji; Dijkema, Jurgen; Bonsen, Tobias; Sammak, Amir; Scappucci, Giordano; Vandersypen, Lieven | In this work, I will describe our experimental efforts to couple two spin qubits in Si/SiGe through a superconducting microwave resonator. | Session 40: Quantum Computing with Hybrid Quantum Dot Systems |

807 | Realization of an Andreev spin qubit | Hays, Max; Fatemi, Valla; Bouman, Daniel; Cerrillo, Javier; Diamond, Spencer; Serniak, Kyle; Connolly, Tom; Krogstrup, Peter; Nygard, Jesper; Levy Yeyati, Alfredo; Geresdi, Attila; Devoret, Michel | Here we combine these two platforms to realize the Andreev spin qubit, the residual degree of freedom of a quasiparticle trapped in the Andreev levels of a Josephson semiconductor nanowire. | Session 40: Quantum Computing with Hybrid Quantum Dot Systems |

808 | Electron Spin Resonance of a Gd-doped CaWO4 crystal coupled to on-chip superconducting resonators. | Franco-Rivera, Giovanni; Cochran, Josiah; Chen, Lei; Wang, Zhen; Sylvain, Bertaina; Chiorescu, Irinel | We present the coupling of coplanar stripline geometry superconducting resonator to the well-defined qubit states of Gd hosted in a CaWO 4 single crystal. | Session 40: Quantum Computing with Hybrid Quantum Dot Systems |

809 | Random-access microwave quantum memory using chirped pulse phase encoding | Kennedy, Oscar; O’Sullivan, James; Alexander, Joseph; Debnath, Kamanasish; Thomas, Chris; Zollitsch, Christoph; Šimenas, Mantas; Hashim, Akel; Withington, Stafford; Siddiqi, Irfan; Molmer, Klaus; Morton, John | We introduce a random access quantum memory protocol using adiabatic fast passages (AFPs) to imprint phase shifts onto single quantum excitations stored in an ensemble of emitters coupled to a cavity. | Session 40: Quantum Computing with Hybrid Quantum Dot Systems |

810 | Microscopic bath effects on noise spectra in semiconductor quantum dot qubits | Kestner, Jason; Ahn, Seongjin | We show that these temperature fluctuations generally give rise to 1/f-like noise power spectral density from even a single two-level system. | Session 40: Quantum Computing with Hybrid Quantum Dot Systems |

811 | Narrow linewidth tin-vacancy centers in diamond waveguides | Rugar, Alison; Aghaeimeibodi, Shahriar; Dory, Constantin; Lu, Haiyu; McQuade, Patrick; Mishra, Sattwik; Sun, Shuo; Shen, Zhixun; Melosh, Nicholas; Vuckovic, Jelena | In this talk, we present narrow-linewidth SnV – centers (~36 MHz) in diamond waveguides [ACS Photonics 7, 2356-2361 (2020).] | Session 40: Quantum Computing with Hybrid Quantum Dot Systems |

812 | Optimizing the density of delta doped Al in Si toward superconductivity | Tang, Ke; Kim, Hyun; Ramanayaka, Aruna; Pomeroy, Joshua | In this talk, we present the material properties and electrical characterization of our 2 nd generation super-saturated Al delta doped layers. | Session 40: Quantum Computing with Hybrid Quantum Dot Systems |

813 | Applications of InAs-Al Heterostructures in Quantum Computing | Yuan, Joseph; Strickland, William; Dartiailh, Matthieu; Tong, Joshua; Hatefipour, Mehdi; Wickramasinghe, Kaushini; Barati, Fatemeh; Sardashti, Kasra; Shabani, Javad | In our group we have demonstrated how a highly transparent contact between a superconductor and a semiconductor allows a two dimensional electron gas in a layer of InAs to be proximitized by superconducting Al [1]. | Session 40: Quantum Computing with Hybrid Quantum Dot Systems |

814 | Optimizing magnetic dopants in ferroelectrics for defect-based qubits | Inzani, Katherine; Huang, Weichuan; Liu, Junjie; Laguta, Valentin; Das, Sujit; Chatterjee, Ruchira; Leclerc, Nima; Sheridan, Evan; Ardavan, Arzhang; Ramesh, Ramamoorthy; Griffin, Sinéad | We demonstrate this electric-field control by a combined first-principles and electron paramagnetic resonance study of the model system Fe 3+-doped PbTiO 3. | Session 40: Quantum Computing with Hybrid Quantum Dot Systems |

815 | N-qubit entanglement of encoded qubits via curvature couplings to a superconducting cavity and joint continuous measurement | Ruskov, Rusko; Tahan, Charles | We propose entangling preparation procedures based on curvature couplings of encoded qubits to a superconducting (SC) cavity, exploring the non-linear qubit response. | Session 40: Quantum Computing with Hybrid Quantum Dot Systems |

816 | Characterization of superconducting transport in CMOS PtSi transistors for scalable qubits | Vethaak, Tom; Calvet, Laurie; Snyder, John; Lefloch, François | We present experimental results on a 50 nm gate length PtSi transistor, where the transparency of the S/Sm interfaces is modulated by the gate voltage. | Session 40: Quantum Computing with Hybrid Quantum Dot Systems |

817 | Measurement and Control of Chiral Edge States in Graphene | Richter, Curt; Le, Son; Hagmann, Joseph; Lee, Ji Ung | Measurement and Control of Chiral Edge States in Graphene | Session 41: Quantum Computing with Topological Superconductors |

818 | Contextuality and memory cost of simulation of Majorana fermions | Calegari, Susane; Bermejo-Vega, Juani; Oszmaniec, Michal | We apply this result to the simulation of a model of quantum computation based on the braiding of Majorana fermions, namely topological quantum computation (TQC) with Ising anyons, finding a saturable lower bound in log-linear in the number of physical modes for the memory cost. | Session 41: Quantum Computing with Topological Superconductors |

819 | Nonlocal signatures of hybridization between quantum dot and Andreev bound state | Pöschl, Andreas; Danilenko, Alisa; Sabonis, Deividas; Kristjuhan, Kaur; Lindemann, Tyler; Gronin, Sergei; Gardner, Geoffrey; Thomas, Candice; Manfra, Michael; Marcus, Charles | We present a novel device geometry based on a semiconducting InAs two-dimensional electron gas proximitized by superconducting Al. | Session 41: Quantum Computing with Topological Superconductors |

820 | Adiabatic fusion and nucleation of Majorana bound states | Habibi, Alireza; Schmidt, Thomas | In this study, we investigate the maximum speed for remaining in the adiabatic limit during these manipulations. | Session 41: Quantum Computing with Topological Superconductors |

821 | Transport and spectroscopy of junction Andreev bound states in half-shell nanowire transmon devices | Danilenko, Alisa; Sabonis, Deividas; Winkler, Georg; Erlandsson, Oscar; Kringhøj, Anders; Van Heck, Bernard; Krogstrup, Peter; Marcus, Charles | Here we study a gate-controlled Josephson junction, formed by selectively removing Al in a lithographically defined segment of a hybrid InAs/Al half-shell nanowire. | Session 41: Quantum Computing with Topological Superconductors |

822 | Majorana qubits | Das Sarma, Sankar | I will cover theory, experiments, materials development, and device fabrication. | Session 41: Quantum Computing with Topological Superconductors |

823 | Charge-transfer based operations revealing non-abelian statistics of Majorana bound states | Seoane Souto, Ruben; Flensberg, Karsten; Leijnse, Martin | In this presentation I will analyze the efficiency of these operations [3]. | Session 41: Quantum Computing with Topological Superconductors |

824 | Dynamics of the Majorana-Transmon qubit with time-dependent voltage bias. | Lupo, Elena; Grosfeld, Eytan; Ginossar, Eran | Here we focus on the theoretical study of this system’s dynamics in the case of time-dependent voltage bias. | Session 41: Quantum Computing with Topological Superconductors |

825 | Parity-to-charge conversion for readout of topological Majorana qubits | Széchenyi, Gábor; Pályi, András | We describe how certain error mechanisms degrade the quality of the parity-to-charge conversion process. | Session 41: Quantum Computing with Topological Superconductors |

826 | Calculating Tunneling Matrix Elements to Majorana Zero Modes Using the Barrier-Integrated Mahaux-Weidenmüller Formula | van Driel, David; Antipov, Andrey | We employ the Mahaux-Weidenmüller formula to calculate the scattering matrix for an island connected to leads. | Session 41: Quantum Computing with Topological Superconductors |

827 | Timons: superconducting gatemon qubits based on proximitized topological insulators | Schmitt, Tobias; Connolly, Malcolm; Schleenvoigt, Michael; Liu, Chenlu; Burke, Declan; Kennedy, Oscar; Lindstrom, Tobias; de Graaf, Sebastian; Jalil, Abdur Rehman; Bennemann, Benjamin; Trellenkamp, Stefan; Lentz, Florian; Neumann, Elmar; Berenschot, Erwin; Tas, Niels; Moors, Kristof; Mussler, Gregor; Petersson, Karl; Grützmacher, Detlev; Schüffelgen, Peter | Here we introduce a new gatemon platform based on V-VI semiconductor (Bi xSb 1-x) 2Te 3 3D topological insulators. | Session 41: Quantum Computing with Topological Superconductors |

828 | Quantum supremacy using a programmable superconducting processor | Martinis, John | Here we report the use of a processor with programmable superconducting qubits to create quantum states on 53 qubits, corresponding to a computational state-space of dimension 2^53 (about 10^16). | Session 42: Quantum Computing: Industry Session |

829 | IonQ Quantum Computers: Clear to Scale | Monroe, Christopher | We have built 5 systems, showing record performance in terms of meaningful circuit depth, and we have several more on the way in a clear engineering path to manufacturability. | Session 42: Quantum Computing: Industry Session |

830 | High volume manufacturing of silicon spin qubits | Watson, Thomas | Here, we discuss how we are using the 300mm infrastructure at Intel to fabricate highly coherent (T2 CPMG ~ 3ms) silicon spin qubits that are similar in size to transistors and that can be integrated with advanced CMOS technologies. | Session 42: Quantum Computing: Industry Session |

831 | Majorana Qubits | Kouwenhoven, Leo | We will present our scalable approach and the results on our path towards Majorana qubits. | Session 42: Quantum Computing: Industry Session |

832 | Silicon Photonic Quantum Computing | OBrien, Jeremy | We will discuss PsiQuantum’s approach to fault tolerant quantum computing. | Session 42: Quantum Computing: Industry Session |

833 | Deep reinforcement learning for quantum Hamiltonian engineering | Peng, Pai; Huang, Xiaoyang; Yin, Chao; Ramanathan, Chandrasekhar; Cappellaro, Paola | We aim at decoupling strongly-interacting spin-1/2 systems and consider different experimental imperfections. | Session 43: Quantum Control in the Presence of Noise and Decoherence |

834 | Reinforcement Learning-based control of a cavity system with non linear measurement | Porotti, Riccardo; Marquardt, Florian; Essig, Antoine; Bienfait, Audrey; Huard, Benjamin | We show that indeed DRL techniques can discover such strategies from scratch, by employing feedback based on nonlinear measurements, and create nonclassical states even in the absence of nonlinear controls. | Session 43: Quantum Control in the Presence of Noise and Decoherence |

835 | Classical Reinforcement Learning for Experimental Quantum Error Correction | Sivak, Volodymyr; Liu, Henry; Eickbusch, Alec; Royer, Baptiste; Tsioutsios, Ioannis; Devoret, Michel | In contrast, using model-free reinforcement learning, we solve a challenging task of learning the parameters of quantum error correction protocol for bosonic grid-state logical encoding directly from ancilla qubit binary measurement outcomes. | Session 43: Quantum Control in the Presence of Noise and Decoherence |

836 | Experimental Evaluation of Active Learning of a Two Qubit Cross-Resonance Hamiltonian | Dutt, Arkopal; Pednault, Edwin; Wu, Chai; Sheldon, Sarah; Smolin, John; Bishop, Lev; Chuang, Isaac | To minimize the number of queries required and improve the scaling with $\epsilon$, we propose a Hamiltonian active learner based on Fisher information (“HAL-FI”). | Session 43: Quantum Control in the Presence of Noise and Decoherence |

837 | Continuous measurements with feedback can improve single-photon probability | Lanka, Anirudh; Brun, Todd | We propose a technique to improve the probability of single-photon emission with an electrically pumped quantum dot in an optical microcavity, by continuously monitoring the dot’s energy state and using feedback to control whether to stop pumping. | Session 43: Quantum Control in the Presence of Noise and Decoherence |

838 | Optimal Quantum Control of Time-Correlated Semiclassical Control Noise | Trout, Colin; Schultz, Kevin; Quiroz, Greg; Barr, Robert; Clader, David | In this work, we provide an analytical framework for constructing optimal control for systems under the influence of temporally-correlated semiclassical control noise. | Session 43: Quantum Control in the Presence of Noise and Decoherence |

839 | Using spectator qubit to Optimally mitigating qubit decoherence | Song, Hongting; Tonekaboni, Behnam; Chantasri, Areeya; Wiseman, Howard | In this project, we consider decoherence effect caused by a random telegraph process (RTP). | Session 43: Quantum Control in the Presence of Noise and Decoherence |

840 | Integration of spectator qubits into quantum computing architectures for adaptive hardware tune-up and noise characterization | Gupta, Riddhi; Milne, Alistair; Edmunds, Claire; Hempel, Cornelius; Govia, Luke; Biercuk, Michael | In this talk, we explore the implications of attempts to efficiently tune-up and calibrate mesoscale quantum computers on the optimal physical layout of the underlying quantum hardware. | Session 43: Quantum Control in the Presence of Noise and Decoherence |

841 | Calibration of the Cross-Resonance Gate using Closed-Loop Optimal Control | Mitchell, Brad; Naik, Ravi; Morvan, Alexis; Hashim, Akel; Kreikebaum, John Mark; Santiago, David; Siddiqi, Irfan | We present a closed-loop, optimization-based protocol to calibrate the cross-resonance gate. | Session 43: Quantum Control in the Presence of Noise and Decoherence |

842 | Contextual Characterization of the Cross-Resonance Gate on a Multi-Qubit Superconducting Quantum Processor | Naik, Ravi; Mitchell, Brad; Hashim, Akel; Kreikebaum, John Mark; Santiago, David; Siddiqi, Irfan | In this work, we use contextual benchmarks to characterize the performance of cross-resonance gates in a superconducting quantum processor. | Session 43: Quantum Control in the Presence of Noise and Decoherence |

843 | Quantum optimal control for high-fidelity arbitrary quantum logic on a superconducting qudit | Wu, Xian; Tomarken, Spencer; Petersson, N. Anders; Martinez, Luis; Rosen, Yaniv; Wendt, Kyle; Kravvaris, Konstantinos; Quaglioni, Sofia; DuBois, Jonathan | We present experimental demonstration of this approach for implementing high-fidelity arbitrary quantum logic on a superconducting qudit. | Session 43: Quantum Control in the Presence of Noise and Decoherence |

844 | Reinforcement learning for error-robust control on cloud-based superconducting hardware [Part I] | Baum, Yuval; Howell, Sean; Liuzzi, Maggie; Mundada, Pranav; Amico, Mirko; Hush, Michael; Biercuk, Michael | In this work, we study a black-box optimization technique based on reinforcement learning for the discovery of high-performance gate-sets on a cloud quantum computer. | Session 43: Quantum Control in the Presence of Noise and Decoherence |

845 | Reinforcement learning for error-robust control on cloud-based superconducting hardware [Part II] | Amico, Mirko; Baum, Yuval; Howell, Sean; Hush, Michael; Liuzzi, Maggie; Mundada, Pranav; Biercuk, Michael | In this work, we study a black-box optimization technique based on reinforcement learning. | Session 43: Quantum Control in the Presence of Noise and Decoherence |

846 | Quantifying the difference between many-body quantum states | Girolami, Davide | We introduce a new class of information-theoretic measures, the weighted distances, to overcome such limitations. | Session 44: Quantum Foundations |

847 | Einstein’s Equivalence principle for superpositions of gravitational fields | Giacomini, Flaminia; Brukner, Caslav | We build a unitary transformation to the QRF of a quantum system in curved spacetime, and in a superposition thereof. | Session 44: Quantum Foundations |

848 | Hierarchy of Theories with Indefinite Causal Structures: A Second Look at the Causaloid Framework | Sakharwade, Nitica; Hardy, Lucien | We present a diagrammatic representation of the Causaloid framework to facilitate exposition and study Meta compression. | Session 44: Quantum Foundations |

849 | Network Nonlocality via Rigidity of Token-Counting and Color-Matching | renou, marc-olivier; Beigi, Salman | Here, we introduce two families of strategies to produce network nonlocal correlations. | Session 44: Quantum Foundations |

850 | When Is a Non-Markovian Quantum Process Classical? | Milz, Simon; Egloff, Dario; Taranto, Philip; Theurer, Thomas; Plenio, Martin; Smirne, Andrea; Huelga, Susana | Using these insights, one gets meaningful quantifiers of how well the best possible classical model describes a given quantum experiment. | Session 44: Quantum Foundations |

851 | Environment as a witness: the inevitable emergence of classicality | Touil, Akram; Yan, Bin; Girolami, Davide; Deffner, Sebastian; Zurek, Wojciech | Therefore, we study quantum Darwinism in the example of a central spin undergoing decoherence in a spin environment. | Session 44: Quantum Foundations |

852 | Observing a Changing Hilbert-Space Inner Product | Karuvade, Salini; Alase, Abhijeet; Sanders, Barry | We establish a theoretical framework for such a changing inner product, which we show is consistent with standard quantum mechanics. | Session 44: Quantum Foundations |

853 | Black boxes in spacetime: semi-device-independent information processing with spatiotemporal degrees of freedom | Müller, Markus; Krumm, Marius; Garner, Andrew | In this article, we consider devices whose inputs are spatiotemporal degrees of freedom, e.g. orientations or time durations. | Session 44: Quantum Foundations |

854 | Engineering superpositions over all possible futures through quantum stochastic simulation | Thompson, Jayne | Here we introduce the first experimental demonstration of a quantum simulator using time-bin encoding in an optical system [2]. | Session 44: Quantum Foundations |

855 | Experimental violation of n-locality in a star quantum network | Poderini, Davide; Agresti, Iris; Marchese, Guglielmo; Polino, Emanuele; Giordani, Taira; Suprano, Alessia; Valeri, Mauro; Milani, Giorgio; Spagnolo, Nicolò; Carvacho, Gonzalo; Chaves, Raphael; Sciarrino, Fabio | In our work by using a scalable photonic platform, we implement star-shaped quantum networks consisting of up to five distant nodes and four independent entanglement sources. | Session 44: Quantum Foundations |

856 | Why standard entanglement theory is inappropriate for the study of Bell scenarios | Schmid, David; Fraser, Thomas; Kunjwal, Ravi; Sainz, Ana; Wolfe, Elie; Spekkens, Robert | We here argue that this is not the best choice for quantifying entanglement in one of the most prominent applications of entanglement theory, namely, the study of Bell scenarios. | Session 44: Quantum Foundations |

857 | Quantum Darwinism and stability of the pointer states | Yan, Bin; Touil, Akram; Girolami, Davide; Deffner, Sebastian; Zurek, Wojciech | In this talk, we discuss the stability of pointer states upon observing the environment. | Session 44: Quantum Foundations |

858 | Certification of Maximum Confidence Quantum Measurements and Their Contextual Advantages | Flatt, Kieran; Lee, Hanwool; Bae, Joonwoo | We show that maximum confidence measurements are certifiable and that the certified confidence can be greater in quantum theory than in noncontextual theories. | Session 44: Quantum Foundations |

859 | Answering Mermin’s Challenge with the Relativity Principle: An Underlying Coherence Between SR and QM | Stuckey, William | In this talk, I will show how the relativity principle, i.e., “no preferred reference frame” (NPRF), answers Mermin’s challenge. | Session 44: Quantum Foundations |

860 | Block Universe Ontological Models: A Framework for Realist Accounts of Quantum Theory That Allows for Retrocausality | Leifer, Matthew | I will argue that it does not and that, in this context, it needs to be upgraded to a stronger assumption called Λ-mediation. | Session 44: Quantum Foundations |

861 | Agreement between observers, a physical principle? | Brandenburger, Adam; Contreras Tejada, Patricia; Kubicki, Aleksander; La Mura, Pierfrancesco; Scarpa, Giannicola | We explore this question in the context of epistemics, and ask whether agreement between observers can serve as a physical principle that must hold for any theory of the world. | Session 44: Quantum Foundations |

862 | A no-go theorem for the persistent reality of Wigner’s friend’s perception | Allard Guerin, Philippe; Baumann, Veronika; Del Santo, Flavio; Brukner, Caslav | In this work we formulate a no-go theorem for the persistent reality of Wigner’s friend’s perception, which allows us to conclude that the perceptions that the friend has of her own measurement outcomes at different times cannot "share the same reality", if seemingly natural quantum mechanical assumptions are met. | Session 44: Quantum Foundations |

863 | Geometric tools for quantum information science | Anza, Fabio | I will discuss how GQM inspires a novel set of tools and results to study the phenomenology of quantum systems and their information-theoretic aspects. | Session 44: Quantum Foundations |

864 | A mathematical framework for operational fine tunings | Catani, Lorenzo; Leifer, Matthew | We here develop a precise theory-independent mathematical framework for characterizing operational fine tunings. | Session 44: Quantum Foundations |

865 | Probability arises from entropy in axiomatic information thermodynamics | Westmoreland, Michael | Probability arises from entropy in axiomatic information thermodynamics | Session 44: Quantum Foundations |

866 | Conditions tighter than noncommutation needed for nonclassicality | Arvidsson-Shukur, David; Chevalier Drori, Jacob; Yunger Halpern, Nicole | We prove sufficient conditions for the KD distribution to be nonclassical (equivalently, necessary conditions for it to be classical). | Session 44: Quantum Foundations |

867 | Quantum and Classical Bayesian Agents | DeBrota, John; Love, Peter | Adopting this, we outline a general approach to modeling rational decision making agents who adopt a normative constraint on expectations for the consequences of hypothetical actions. | Session 44: Quantum Foundations |

868 | Retrocausal model of reality for quantum fields | Reid, Margaret; Drummond, Peter | Our theory resolves a number of practical and philosophical issues in quantum measurement, and we compare it with earlier theories. | Session 44: Quantum Foundations |

869 | Quantum Fields from Quantum Cellular Automata | Brun, Todd; Mlodinow, Leonard | To go to multiple particles and describe a quantum field theory in discrete spacetime, a quantum cellular automaton (QCA) is a natural choice. | Session 44: Quantum Foundations |

870 | The Wave-Function Must Be Psi-Ontic | Hubert, Mario | I argue that each theory that violates either of these assumptions meets unsurmountable problems. | Session 44: Quantum Foundations |

871 | Experimental quantum interference of distinguishable sets of indistinguishable photons | Münzberg, Julian; Dittel, Christoph; Lebugle, Maxime; Buchleitner, Andreas; Szameit, Alexander; Weihs, Gregor; Keil, Robert | Here, we experimentally investigate the suppression law of the J x unitary in a femtosecond laser-written waveguide structure with 4 photons emitted from a SPDC source. | Session 44: Quantum Foundations |

872 | Jumptime unraveling of open quantum systems | Gneiting, Clemens; Rozhkov, Alexander; Nori, Franco | In contrast to the standard unraveling of quantum master equations, where the stochastically evolving quantum trajectories are ensemble-averaged at specific times, we argue that quantum trajectories can as well be averaged at specific jump counts. | Session 44: Quantum Foundations |

873 | Stochastic Action Functionals for Diffusive Quantum Trajectories | Lewalle, Philippe; Cylke, Kurt; Noungneaw, Tanawut; Wiseman, Howard; Jordan, Andrew; Chantasri, Areeya | We compare this method to similar approaches based on the Onsager-Machlup (OM) functional, that were developed in the context of classical stochastic processes. | Session 44: Quantum Foundations |

874 | On Interchangeability of Probe–Object Roles in Quantum–Quantum Interaction-Free Measurement | Filatov, Stanislav; Auzinsh, Marcis | We examine Interaction-free measurement (IFM) where both the probe and the object are quantum particles. | Session 44: Quantum Foundations |

875 | Classical model of delayed-choice quantum eraser | La Cour, Brian; Yudichak, Thomas | Classical model of delayed-choice quantum eraser | Session 44: Quantum Foundations |

876 | Particles, Fields, and the Measurement of Electron Spin | Sebens, Charles | In this talk, I will compare treatments of the Stern-Gerlach experiment across different physical theories, building up to a novel analysis of electron spin measurement in the context of classical Dirac field theory. | Session 44: Quantum Foundations |

877 | The Cost of Quantum Locality | Bédard, Charles Alexandre | More recently, Raymond-Robichaud [2] proposed another approach to the same conclusion. | Session 44: Quantum Foundations |

878 | Modeling Generalized Squeezed States | Turner, Skylar; La Cour, Brian | We consider the general problem of modeling an n-photon entangled state by a squeezed vacuum state using a squeezing operator given by a squeezing tensor of rank n. | Session 44: Quantum Foundations |

879 | Measurement-induced phase transitions in deterministic non-local quantum circuits | Hashizume, Tomohiro; Bentsen, Gregory; Daley, Andrew | Here we show that the answer is no: the same effect can be observed even in deterministic hybrid quantum circuits whose 2-qubit gates are arranged according to a fixed, non-local coupling graph. | Session 44: Quantum Foundations |

880 | A Quantum-Classical Isomorphic Interpretation of Quantum Foundations Based on Density Functional Theory and Polymer Self-Consistent Field Theory | Thompson, Russell | A Quantum-Classical Isomorphic Interpretation of Quantum Foundations Based on Density Functional Theory and Polymer Self-Consistent Field Theory | Session 44: Quantum Foundations |

881 | Ruling out Bipartite Nonsignaling Nonlocal Models for Tripartite Correlations | Bierhorst, Peter | This paper introduces a rigorous framework for analyzing tripartite correlations that can be simulated by such bipartite-only networks. | Session 44: Quantum Foundations |

882 | Quantum erasing the memory of Wigner’s friend | Elouard, Cyril; Lewalle, Philippe; Kizhakkumpurath Manikandan, Sreenath; Rogers, Spencer; Frank, Adam; Jordan, Andrew | We provide a single-photon interferometer that maps onto the Frauchiger-Renner scenario and illustrates our point. | Session 44: Quantum Foundations |

883 | Quantum reference frame transformations as symmetries and the paradox of the third particle Marius Krumm, co-authors: Philipp A. Hoehn and Markus P. Mueller | Krumm, Marius; Höhn, Philipp; Müller, Markus | We show that quantum reference frame (QRF) transformations appear naturally as symmetries of simple physical systems. | Session 44: Quantum Foundations |

884 | Entanglement entropy of energy eigenstates follows a universal scaling function | Miao, Qiang; Barthel, Thomas | For the typical models that allow for a field-theoretical description of the long-range physics, we find that the entanglement entropy of (almost) all eigenstates is described by a single scaling function. | Session 44: Quantum Foundations |

885 | Quantifying non-Markovianity: a quantum resource-theoretic approach | Anand, Namit; Brun, Todd | We study quantum non-Markovianity as a resource theory and introduce the robustness of non-Markovianity: an operationally-motivated, optimization-free measure that quantifies the minimum amount of Markovian noise that can be mixed with a non-Markovian evolution before it becomes Markovian. | Session 44: Quantum Foundations |

886 | Creating an Introductory-Level Interdiscplinary Course in Quantum Information | Smith, Graeme | I will discuss the creation of an introductory, interdisciplinary course in quantum information at the University of Colorado Boulder. | Session 45: Quantum Information Education |

887 | Redesigning quantum information science education and training: The Chicago Quantum Exchange approach | Timmerman, Kate | Developing a robust pipeline of quantum experts is integral to advancing and scaling these technologies within universities, national research laboratories and centers, and companies large and small. | Session 45: Quantum Information Education |

888 | Numerical simulation of NMR/NQR experiments for the demonstration of quantum computing principles | Candoli, Davide; Sanna, Samuele; Mitrovic, Vesna | Following this idea, we have developed a software which simulates pulsed NMR/NQR experiments by employing both linearly and circularly polarized radiofrequency pulses and reproduces their results as are observed in laboratory. | Session 45: Quantum Information Education |

889 | Emulating a Quantum Computer with an FPGA | Davis, Jackson; Collett, Charles | Numerous methods have been implemented to escape the exponential growth of time and resources required for emulation of a quantum system. | Session 45: Quantum Information Education |

890 | An educational program to teach quantum information science to high-school students | Barnes, Edwin; Economou, Sophia; Rudolph, Terry | We present a simple, accessible, yet rigorous outreach/educational program focused on quantum information science and technology for high-school and early undergraduate students. | Session 45: Quantum Information Education |

891 | Introducing Quantum Information with the Quadratic Equation | Brannen, Carl | Introducing Quantum Information with the Quadratic Equation | Session 45: Quantum Information Education |

892 | Coherent control of NV− centers in diamond in a quantum teaching lab | Yang, Yang; Sewani, Vikas; Pla, Jarryd; Laucht, Arne | Here, we describe a low-cost experimental setup for coherent control experiments on the electronic spin state of the NV − center. | Session 45: Quantum Information Education |

893 | Geometric Visualizations of Single and Entangled Qubits | Chang, Henry; Roccaforte, Shea; Xu, Rose; Cadden-Zimansky, Paul | Taking a cue from visualizations of special relativity, where Minkowski diagrams in reduced-dimensional subspaces of 2 or 3 dimensions provide useful pedagogical and conceptual tools for understanding basic concepts, we discuss how taking a subspace of the full two-qubit space allows for the construction of one-to-one maps that visualize this subspace in 2 and 3 dimensions. | Session 45: Quantum Information Education |

894 | Qubit by Qubit: Creating Accessible and Inclusive Quantum Education for High School Students | Peltz, Kiera; Karamlou, Amir; Vasconcelos, Francisca; Agarwal, Akshay | In this talk, The Coding School’s Qubit by Qubit team will discuss its outreach strategy for reaching underrepresented minorities, inclusive program design, and quantum computing curriculum content accessible at the high school level. | Session 45: Quantum Information Education |

895 | Bell’s inequality in terms of probabilities | Marcella, Thomas | This straightforward approach contains no physics, but we tacitly assume that Separability and Locality, pillars of classical theory, are in effect. | Session 45: Quantum Information Education |

896 | QWorld: Inviting everyone to be part of the second quantum revolution | Yakaryilmaz, Abuzer; Delgado, Andrea | QResearch’s goal is to bring together researchers to foster collaboration and match students with mentors to develop a short-term research project. | Session 45: Quantum Information Education |

897 | The power of quantum neural networks | Abbas, Amira; Sutter, David; Zoufal, Christa; Lucchi, Aurelien; Figalli, Alessio; Woerner, Stefan | In this work, we use tools from information geometry to define a notion of expressibility for quantum and classical models. | Session 46: Quantum Machine Learning |

898 | Variational Quantum Boltzmann Machines | Zoufal, Christa; Lucchi, Aurélien; Woerner, Stefan | This work presents a novel realization approach to Quantum Boltzmann Machines (QBMs). | Session 46: Quantum Machine Learning |

899 | Data re-uploading for a universal quantum classifier | Pérez-Salinas, Adrián; Cervera-Lierta, Alba; Gil-Fuster, Elies; Latorre, José I. | The extension of this idea to several qubits enhances the efficiency of the strategy as entanglement expands the superpositions carried along with the classification. | Session 46: Quantum Machine Learning |

900 | Learnability and Complexity of Quantum Sample | Niu, Murphy Yuezhen; Dai, Andrew; Li, Li; Smelyanskiy, Vadim; Neven, Hartmut; Boixo, Sergio | A similar exponential separation has yet to be established in generative models through quantum sample learning: given samples from an n-qubit computation, can we learn the underlying quantum distribution using models with training parameters that scale polynomial in n under a fixed training time? | Session 46: Quantum Machine Learning |

901 | Operational Natural Gradients For Variational Quantum Algorithms | McMahon, Nathan | Here I will present an alternate natural gradient technique for ground state minimisation that abstracts away the wave function and focuses on the output distribution used to compute the Energy. | Session 46: Quantum Machine Learning |

902 | Generation of High Resolution Handwritten Digits with Samples from a Quantum Device | Rudolph, Manuel; Toussaint Bashige, Ntwali; Katabarwa, Amara; Peropadre, Borja; Perdomo-Ortiz, Alejandro | To maximize the potential of this algorithm on NISQ devices, we propose a novel technique that leverages on the unique quantum possibilities of measuring in bases other than the computational basis, enhancing the expressibility of the prior distribution of our quantum-classical approach. | Session 46: Quantum Machine Learning |

903 | Tensor-Flow Quantum: An open source software framework for hybrid quantum-classical machine learning | Mohseni, Masoud | We present several new techniques for quantum circuit learning on Noisy Intermediate-Scale Quantum (NISQ) processors. | Session 46: Quantum Machine Learning |

904 | Barren Plateaus in Quantum Neural Networks | Cerezo de la Roca, Marco; Sone, Akira; Sharma, Kunal; Volkoff, Tyler; Cincio, Lukasz; Coles, Patrick | For both of these we provide conditions under which the parameter trainability can be guaranteed, and we connect the notion of locality of the cost with its trainability. | Session 46: Quantum Machine Learning |

905 | Power of data in quantum machine learning | Huang, Hsin-Yuan; Broughton, Michael; Mohseni, Masoud; Babbush, Ryan; McClean, Jarrod | In this work, we show that some problems that are classically hard to compute can, in fact, be predicted easily with classical machines that learn from data. | Session 46: Quantum Machine Learning |

906 | Quantum Machine Learning with Quantum-Probabilistic Generative Models | Martinez, Antonio; Roeder, Geoffrey; Verdon-Akzam, Guillaume | In this work we explore the task of generatively modelling mixed quantum states using hybridizations of classical probabilistic machine learning models and quantum neural networks (QNNs). | Session 46: Quantum Machine Learning |

907 | A divide-and-conquer algorithm for quantum state preparation | Araujo, Israel; Park, Kyungdeock; Petruccione, Francesco; da Silva, Adenilton | Here, we show that it is possible to load an N-dimensional vector with exponential time advantage using a quantum circuit with polylogarithmic depth and entangled information in ancillary qubits. | Session 46: Quantum Machine Learning |

908 | Enhancing Combinatorial Optimization with Quantum Generative Models | Fernandez Alcazar, Francisco; Perdomo, Alejandro | In this work we introduce a new family of quantum-enhanced optimizers and demonstrate how quantum machine learning models, knows as quantum generative models, can enhance the performance over results based only on state-of-the-art classical solvers. | Session 46: Quantum Machine Learning |

909 | Adversarial Robustness of Quantum Machine Learning Models | Liao, Haoran; Convy, Ian; Huggins, William; Whaley, Birgitta | In this paper, we focus on the adversarial robustness in classifying a subset of encoded states that are smoothly generated from a Gaussian latent space. | Session 46: Quantum Machine Learning |

910 | A Quantum Reservoir Computing Approach to Image Classification | Hu, Fangjun; Khan, Saeed; Angelatos, Gerasimos; Tureci, Hakan | In this work, we consider and analyze the efficacy of a reservoir computing approach to address these issues. | Session 46: Quantum Machine Learning |

911 | Neuromorphic computing with single-element quantum reservoirs | Govia, Luke; Kalfus, William; Ribeill, Guilhem; Rowlands, Graham; Krovi, Hari; Ohki, Thomas | We study the noise-resilient neuromorphic computing scheme of reservoir computing with a quantum system as a reservoir. | Session 46: Quantum Machine Learning |

912 | Quantum Learning at High Temperatures in a Dissipative Electronic System | Miller, John; Villagran, Martha; Wosik, Jarek; Kolapo, Ayo | We discuss proposed concepts that exploit such phenomena, including a CDW quantum reservoir computing concept and quantum devices based on patterned ion implantation of CDW materials. | Session 46: Quantum Machine Learning |

913 | Storage properties of a quantum perceptron | Gratsea, Aikaterini; Kasper, Valentin; Lewenstein, Maciej | In this work, we explore the storage capacity of a specific quantum perceptron architecture. | Session 46: Quantum Machine Learning |

914 | Kerr Network Reservoir Computing for Quantum State Measurement | Angelatos, Gerasimos; Khan, Saeed; Tureci, Hakan | Here we propose reservoir processing as a hardware-based solution to superconducting qubit readout. | Session 46: Quantum Machine Learning |

915 | Quantum Thermodynamics of Quantum Boltzmann Machines | Oh, Sangchul; Kais, Sabre | The entropy, free energy, work, and Jarzynski equality were investigated. | Session 46: Quantum Machine Learning |

916 | Quantum-assisted GAN networks for particle shower simulation | Delgado, Andrea | For this reason, we consider an approach for incorporating near-term quantum hardware into deep learning models in which a quantum model is trained and deployed on quantum hardware and used to implement a portion (e.g., a layer of a deep neural network) of the overall deep learning model. | Session 46: Quantum Machine Learning |

917 | Quantum generative adversarial networks with provable convergence | Niu, Murphy Yuezhen; Broughton, Michael; Zlokapa, Alexander; Mohseni, Masoud; Smelyanskiy, Vadim; Neven, Hartmut | In this work, we prove that the iterative training of a discriminator circuit against a generator circuit of previously proposed quantum GANs does not converge for certain initializations, but instead exhibits periodic oscillation between two configurations. | Session 46: Quantum Machine Learning |

918 | Quantum Long Short-Term Memory | Chen, Samuel Yen-Chi; Yoo, Shinjae; Fang, Yao-Lung L. | In this talk, we propose a model of LSTM based on the hybrid quantum-classical paradigm, which we call QLSTM. | Session 46: Quantum Machine Learning |

919 | Implementation of quantum machine learning for electronic structure calculations of periodic systems on NISQ devices | Sureshbabu, Shree Hari; Xia, Rongxin; Kais, Sabre | We present the modified approach that can be implemented on Noisy Intermediate-Scale Quantum (NISQ) devices along with the results of implementing this method on IBM-Q for the computation of the electronic structure of graphene. | Session 46: Quantum Machine Learning |

920 | Analysis of a Quantum Kernel-Based Classifier Using a Tunable Trapped Ion Noisy Simulator | Kenemer, Keith; Cubeddu, Michael; MacCormack, Ian; Delaney, Conor; Aggarwal, Nidhi; Narang, Prineha | In this work, we develop a tunable trapped-ion noisy simulator to analyze the noise-sensitivity of a relevant quantum machine learning (QML) algorithm with respect to various noise metrics specific to existing and near-term trapped-ion hardware. | Session 46: Quantum Machine Learning |

921 | RL-QAOA: A Reinforcement Learning Approach to Many-Body Ground State Preparation | Yao, Jiahao; Lin, Lin; Bukov, Marin | We proposed a reinforcement learning (RL) approach to preparing the ground state of many-body quantum systems. | Session 46: Quantum Machine Learning |

922 | Reinforcement learning for semi-autonomous approximate quantum eigensolver | Albarran-Arriagada, Francisco; Retamal, Juan Carlos; Lamata, Lucas; Solano, Enrique | Here, we propose a protocol to obtain an approximation of the eigenvectors of an arbitrary Hermitian quantum operator. | Session 46: Quantum Machine Learning |

923 | Differentiable Quantum Architecture Search | Zhang, Shixin; Hsieh, Chang-Yu; Zhang, Shengyu; Yao, Hong | Hereby, we propose a general framework of differentiable quantum architecture search (DQAS), which enables automated designs of quantum circuits in an end-to-end differentiable fashion. | Session 46: Quantum Machine Learning |

924 | Quantum computation on defective circuits | Ansari, Mohammad | I present how to update ideal gate operations to get the expected output state from such faulty circuit and present examples performed on real quantum processors as well as simulation machines. | Session 46: Quantum Machine Learning |

925 | Branching Quantum Convolutional Neural Networks: A Variational Ansatz with Mid-Circuit Measurements | MacCormack, Ian; Delaney, Conor; Galda, Alexey; Narang, Prineha | We introduce the bQCNN, a variation of the quantum convolutional neural network (QCNN) in which outcomes from mid-circuit measurements of subsets of qubits inform subsequent quantum gate operations. | Session 46: Quantum Machine Learning |

926 | Learning local and nonlocal quatum data via generative model over tensor network architechture | Najafi, Khadijeh; Azizi, Ahmadreza; Stoudenmire, Miles; Gao, Xun; Lukin, Mikhail; Yelin, Susanne; Mohseni, Masoud | To this end, we investigate the training of the Born Machine for learning both local and nonlocal data encoded in GHZ and Cluster states over various tensor network architectures. | Session 46: Quantum Machine Learning |

927 | A few examples of Machine Learning and Artificial Neural Networks applied to Quantum Physics | Nori, Franco | Machine learning provides effective methods for identifying topological features [1]. | Session 46: Quantum Machine Learning |

928 | Quantum-enhanced data classification with a variational entangled sensor network | Xia, Yi; Li, Wei; Zhuang, Quntao; Zhang, Zheshen | Supervised learning assisted by an entangledsensor network (SLAEN) is a distinct paradigm that harnesses VQCs trained by classical machine learning algorithms to tailor multipartite entanglement shared by the sensors for solving practically useful data processing problems. | Session 46: Quantum Machine Learning |

929 | Classical variational simulation of the Quantum Approximate Optimization Algorithm | Medvidović, Matija; Carleo, Giuseppe | We introduce a method to classically simulate quantum circuits made of several layers of parameterized gates, a key component of variational algorithms suitable for near-term quantum computers. | Session 46: Quantum Machine Learning |

930 | Using Reinforcement Learning for Quantum Control in Magnetic Resonance | Kaufman, Will; Alford, Benjamin; Peng, Pai; Huang, Xiaoyang; Cappellaro, Paola; Ramanathan, Chandrasekhar | We compare RL algorithms to gradient ascent pulse engineering (GRAPE) for both state-to-state transfer operations as well as the design of desired unitary operations on single- and two-qubit systems. | Session 46: Quantum Machine Learning |

931 | Machine Learning-Derived Entanglement Witnesses | Zhu, Eric; Wu, Larry; Qian, Li | Recent studies of the classification of entangled states have utilized aspects of machine learning such as neural networks. | Session 46: Quantum Machine Learning |

932 | Unsupervised machine learning quantum dynamics | Choi, Matthew; Flam-Shepherd, Daniel; Kyaw, Thi Ha; Aspuru-Guzik, Alan | In this talk, we describe the application of generative models using neural ODEs to quantum dynamics, which we show, can learn the underlying quantum dynamics and can extrapolate well beyond the training regime when performing reconstructions. | Session 46: Quantum Machine Learning |

933 | Quantum adiabatic machine learning with zooming | Zlokapa, Alexander; Mott, Alex; Job, Joshua; Vlimant, Jean-Roch; Lidar, Daniel; Spiropulu, Maria | We propose QAML-Z, a novel algorithm that iteratively zooms in on a region of the energy surface by mapping the problem to a continuous space and sequentially applying quantum annealing to an augmented set of weak classifiers. | Session 46: Quantum Machine Learning |

934 | Convolutional Neural Networks and Symmetries of Quantum 1D Spin Chains | Alam, Shah Saad; Ju, Yilong; Minoff, Jonathan; Anselmi, Fabio; Patel, Ankit; Pu, Han | Using neural network architectures that employ quantum variational Monte Carlo methods has opened up a new method of studying quantum many body systems. | Session 46: Quantum Machine Learning |

935 | Deep Quantum Control: End-to-end quantum control using deep learning algorithms | Khosravani, Omid | Here we propose an "end-to-end" framework, which instead starts from direct experimental observations to obtain optimal quantum control trajectories that are sufficiently resilient to all sources of errors. | Session 46: Quantum Machine Learning |

936 | Unsupervised Learning of Physical Systems with Two-dimensional Tensor Network Structures | Azizi, Ahmadreza; Najafi, Khadijeh; Mohseni, Masoud | Leveraging on the expressibility and training power of Projected Entangled Pair State (PEPS) networks, we study the capability of our Born Machine with PEPS structure in learning the underlying patterns in the classical Ising model and two dimensional Rydberg atom. | Session 46: Quantum Machine Learning |

937 | Pattern-Recognition Training of a Quantum Neuron on a Quantum Computer | Cavaletto, London; Candelori, Luca; Matos Abiague, Alex | We propose an alternative quantum perceptron (QP) model that uses a reduced number of multi-qubit gates and is less susceptible to quantum errors than other existing models. | Session 46: Quantum Machine Learning |

938 | Explainable Natural Language Processing with Matrix Product States | Bhadola, Pradeep; Tangpanitanon, Jirawat; Mangkang, Chanatip; Minato, Yuichiro; Angelakis, Dimitris; chotibut, thiparat | Here, we attempt to provide systematic answers through the mapping between DL and its matrix product state (MPS) counterpart [2]. | Session 46: Quantum Machine Learning |

939 | Machine-learning tools for rapid control, calibration and characterization of QPUs and other quantum devices | Wittler, Nicolas; Roy, Federico; Pack, Kevin; Werninghaus, Max; Roy, Anurag Saha; Egger, Daniel; Filipp, Stefan; Wilhelm, Frank; Machnes, Shai | In this talk I shall present the overall concept, and insights into future directions. | Session 46: Quantum Machine Learning |

940 | Trainability of Quantum Neural Networks: Barren Plateaus and Scalability | Coles, Patrick | In this talk, we will discuss recent progress in understanding the barren plateau phenomenon in QNNs, focusing especially on analytical gradient scaling results for QNNs. | Session 46: Quantum Machine Learning |

941 | Which classes of functions can quantum machine learning models actually learn? | Schuld, Maria | A lot of work in quantum machine learning focuses on how to practically train quantum models, or how to prove that they can be classically intractable. | Session 46: Quantum Machine Learning |

942 | Applications and experimental realizations of quantum generative adversarial networks | Lloyd, Seth; De Palma, Giacomo; Kiani, Bobak; Marvian, Milad | This talk presents a review of the theory of quantum generative adversarial networks, describes their application to pattern recognition and to quantum state and process tomography, and summarizes the current experimental state of the art for implementing qGANs. | Session 46: Quantum Machine Learning |

943 | Classical simulation of quantum circuits with neural-network states | Carleo, Giuseppe | In this talk I will discuss advances in the classical variational representations of many-qubit states based on artificial neural networks. | Session 46: Quantum Machine Learning |

944 | Progress in Machine Learning with Tensor Networks | Stoudenmire, Edwin | After reviewing tensor networks, I will discuss recent progress in using them as a type of machine learning model, in contrast to neural networks or other model families. | Session 46: Quantum Machine Learning |

945 | Observation of ac Photocurrent Vortices in Monolayer MoS2 Using NV Centers | Jerger, Paul; Zhou, Brian; Fukami, Masaya; Lee, Kan-Heng; Mujid, Fauzia; Park, Jiwoong; Awschalom, David | We demonstrate a contact-free method to spatially and temporally resolve photocurrents using nitrogen-vacancy (NV) centers in diamond, and discover that optical excitation of MoS 2 produces photocurrent vortices [1]. | Session 47: Quantum Metrology and Sensing |

946 | Evolution of Hyperfine Couplings to NV Centers under Hydrostatic Pressure | McPherson, Chris; Wang, Zhipan; Curro, Nicholas; Casey, William | We will discuss the challenges of performing ODMR under pressure, including delivering microwaves inside of the cell. | Session 47: Quantum Metrology and Sensing |

947 | X-ray nanoprobe strain measurements for diamond-based quantum sensing | Marshall, Mason; Phillips, David; Turner, Matthew; Ku, Mark; Zhou, Tao; Delegan, Nazar; Joseph, F.; Holt, Martin; Walsworth, Ronald | We discuss the application of this technique to lab-grown diamonds, including measurements of growth-defect-induced strain in a diamond optimized for magnetic sensing and background characterization measurements for a proposed dark matter detector. | Session 47: Quantum Metrology and Sensing |

948 | Probing thermal magnon current mediated by coherent magnon via nitrogen-vacancy centers in diamond | Prananto, Dwi; Kainuma, Yuta; Hayashi, Kunitaka; Mizuochi, Norikazu; Uchida, Ken-ichi; An, Toshu | We report the detection of thermal magnon current propagating in a magnetic insulator yttrium iron garnet under a temperature gradient, using electron spins hosted in a diamond matrix with nitrogen-vacancy (NV) defect centers. | Session 47: Quantum Metrology and Sensing |

949 | A portable diamond-based quantum demonstrator based on a quantum control and readout platform | Badaroudine, Azfar; Lachance-Quirion, Dany; Chakravarty, Ankita; Njejimana, Larissa; Roux, Marc-Antoine; Messaoudi, Nizar; Crocker, Clayton; Dubé, Hubert; Halde, Vincent; Bernard, Olivier; Roy-Guay, David; Tétrault, Marc-André; Pioro-Ladriere, Michel | We will present room-temperature results including optically detected magnetic resonance, Rabi and Ramsey oscillations of an ensemble of NV centers. | Session 47: Quantum Metrology and Sensing |

950 | Imaging and controlling large spin systems with a single-spin quantum sensor | Taminiau, Tim Hugo | In this talk, I will discuss our recent advances in imaging individual clusters of nuclear spins with atomic resolution, and show how such spin systems can be used for quantum information processing and investigating many-body physics. | Session 47: Quantum Metrology and Sensing |

951 | Quantum Sensing using Nitrogen Vacancy (NV) Centers in Nanodiamonds under Extreme Conditions | Ho, Kin On; Yip, King Yau; Yu, King Yiu; Leung, Man Yin; Jiang, Yaxin; Pang, Yiu Yung; Goh, Swee; Yang, Sen | This is a powerful tool in the study of quantum physics in strongly correlated systems under pressure. | Session 47: Quantum Metrology and Sensing |

952 | Sensing protocols for non-polarized nano-NMR spectroscopy with NV centers | Casado, Santiago | In this work we show that in the NV based nano-NMR setup such diffusion noise results in high spectral resolution, and analize the behaviour of different measurement protocols and scenarios to conclude that heterodyne measurements provide the best resolution scaling. | Session 47: Quantum Metrology and Sensing |

953 | AC field sensing metrology with NV ensembles under extreme pressure | Wang, Zhipan; McPherson, Chris; Brandt, Nicholas; Casey, William; Curro, Nicholas | In this study, we have utilized NV center ensemble measurements within a high-pressure diamond anvil cell to sense AC fields on level of nT under GPa pressure. | Session 47: Quantum Metrology and Sensing |

954 | Probing Transport in Condensed Matter Systems using multiple Nitrogen Vacancy Centers | Rovny, Jared; Rodgers, Lila; Yuan, Zhiyang; Fitzpatrick, Mattias; De Leon, Nathalie | We explore ways to gain new information about the dynamics of condensed matter systems by simultaneously addressing optically resolved NV centers. | Session 47: Quantum Metrology and Sensing |

955 | Reporter-spin-assisted T1 relaxometry with nitrogen-vacancy centers in diamond | Zhang, Zhiran; Bluvstein, Dolev; Williams, Nicolas; Jayich, Ania | To circumvent the difficulties of engineering arbitrarily shallow and charge stable NVs and to achieve higher spatial resolution, we propose utilizing auxiliary relaxation reporter spins on the diamond surface to detect fluctuating magnetic fields at nanoscale. | Session 47: Quantum Metrology and Sensing |

956 | Electron Spin Resonance of Nanoscale Materials using Nitrogen Vacancy Ensembles in Diamond | Saleh Ziabari, Maziar; Henshaw, Jacob; Kehayias, Pauli; Lu, Tzu-Ming; Harris, Charles; Bielejec, Edward; Biederman, Eric; Huber, Dale; Ristoff, Nate; Acosta, Victor; Lilly, Michael; Mounce, Andrew | In this presentation, we demonstrate NV electron spin resonance (NV-ESR) and integrate nanoparticles onto the surface of diamond at various densities toward measuring nanomaterial properties using NV-ESR. | Session 47: Quantum Metrology and Sensing |

957 | RLD Fisher Information Bound for Multiparameter Estimation of Quantum Channels | Katariya, Vishal; Wilde, Mark | In this work, we study fundamental limits to quantum channel estimation via the concept of amortization and the right logarithmic derivative (RLD) Fisher information value. | Session 47: Quantum Metrology and Sensing |

958 | Quantum metrology in non-collective, spatiotemporally correlated quantum noise environments | Riberi, Francisco; Norris, Leigh; Beaudoin, Felix; Viola, Lorenza | We study the impact of non-collectivity on frequency estimation by Ramsey interferometry in the presence of spatiotemporally correlated Gaussian quantum noise. | Session 47: Quantum Metrology and Sensing |

959 | Activating hidden metrological usefulness | Toth, Geza; Vertesi, Tamas; Horodecki, Pawel; Horodecki, Ryszard | We present a general method to find the local Hamiltonian for which a given quantum state performs the best compared to separable states. | Session 47: Quantum Metrology and Sensing |

960 | Surprises in reservoir-engineering approaches to spin-squeezing | Groszkowski, Peter; Lau, Hoi-Kwan; Koppenhoefer, Martin; Clerk, Aashish | In this talk, we revisit the theory of dissipative protocols, where appropriately engineered noise processes can be utilized for spin-squeezing generation [1][2]. | Session 47: Quantum Metrology and Sensing |

961 | Super-Sensitive Quantum Metrology with Many-Particle Separable State | Lahiri, Mayukh; Erhard, Manuel | We present a super-resolving and super-sensitive phase measurement scheme that does not require either a squeezed state or an entangled state. | Session 47: Quantum Metrology and Sensing |

962 | Entanglement-Assisted Absorption Spectroscopy | Shi, Haowei; Zhang, Zheshen; Pirandola, Stefano; Zhuang, Quntao | We design a practical transmitter-receiver system that exploits entanglement to achieve a provable quantum advantage over all spectroscopic schemes based on classical sources. | Session 47: Quantum Metrology and Sensing |

963 | Theory of entanglement-assisted metrology for quantum channels | Zhou, Sisi; Jiang, Liang | Here we obtain a simple criterion that determines whether the scaling is linear or quadratic. | Session 47: Quantum Metrology and Sensing |

964 | Observing a Topological Transition in Weak-Measurement-Induced Geometric Phases | Wang, Zoe; Snizhko, Kyrylo; Romito, Alessandro; Gefen, Yuval; Murch, Kater | To experimentally measure this transition, we employ quantum non-demolition measurement of a superconducting transmon circuit in the strong dispersive regime. | Session 47: Quantum Metrology and Sensing |

965 | Quantum Metrology in the Era of Quantum Information | Demkowicz-Dobrzanski, Rafal | The theory developed allows to determine whether the Heisenberg scaling of precision is possible for a quantum sensor subject to a general Markovian noise. | Session 47: Quantum Metrology and Sensing |

966 | A geometric pathway to scalable quantum sensing | Brennen, Gavin; Johnsson, Mattias; Roy Mukty, Nabomita; Burgarth, Daniel; Volz, Thomas | We present a quantum control strategy using highly nonlinear geometric phase gates which can be used for generic state or unitary synthesis on the Dicke subspace with O(N) or O(N^2) gates, respectively. | Session 47: Quantum Metrology and Sensing |

967 | Signatures of the quantum nature of gravity: Principle and practice | Datta, Animesh; Miao, Haixing | We study the quantum nature of the gravitational interaction between two identical masses in the Newtonian limit. | Session 47: Quantum Metrology and Sensing |

968 | Enhancing qubit noise spectroscopy using a quantum quench | Wang, Yuxin; Clerk, Aashish | Here, we discuss modifications of standard Ramsey-based noise spectroscopy protocols that incorporate an effective quantum quench of the bath. | Session 47: Quantum Metrology and Sensing |

969 | Quantum-limited Estimation of Coherence Under Thermal Noise in Photon-starved States | Chua, Zi; Habif, Jonathan; Spedalieri, Federico | In this work, we search for an optimal measurement for estimating the coherence, parameterised as η, of a mixed state composed of coherent light and thermal (incoherent) light. | Session 47: Quantum Metrology and Sensing |

970 | Quantum sensing beyond the standard quantum limit with 2D arrays of trapped ions | Affolter, Matthew; Gilmore, Kevin; Lewis-Swan, Robert; Barberena, Diego; Jordan, Elena; Rey, Ana Maria; Bollinger, John | We present experiments and theory investigating the limits of electric field sensing via the excitation of the center-of-mass (COM) motion of 100s of ions in a 2D crystal. | Session 47: Quantum Metrology and Sensing |

971 | Observing nonlinear spin squeezing and entanglement of non-Gaussian states with interconnected superconducting qubits | Zhang, Yu-Ran; Xu, Kai; Sun, Zheng-Hang; Nori, Franco; Wang, Haohua; Fan, Heng | Using 20 interconnected superconducting qubits, we measure the nonlinear squeezing parameter, as a generalization of the Ramsey squeezing parameter with nonlinear observables, and identify the metrological enhancement of non-Gaussian states. | Session 47: Quantum Metrology and Sensing |

972 | Noise and Power handling of the Inelastic Cooper-pair Tunneling Amplifier (ICTA) | Martel, Ulrich; Blanchet, Florian; Albert, Romain; Jebari, Salha; Griesmar, Joel; Hofheinz, Max | We have demonstrated added noise at the quantum limit within measurement accuracy and we discuss here saturation and the influence of voltage bias noise. | Session 47: Quantum Metrology and Sensing |

973 | Quantum multiphase estimation in an integrated photonic circuit | Polino, Emanuele; Sciarrino, Fabio; Valeri, Mauro; Spagnolo, Nicolò; Osellame, Roberto; Crespi, Andrea; Gianani, Ilaria; Corrielli, Giacomo; Poderini, Davide; Silvestri, Raffaele; Riva, Martina | Quantum multiphase estimation in an integrated photonic circuit | Session 47: Quantum Metrology and Sensing |

974 | Quantum Sensing Simulation on Quantum Computers using Optimized Control | Titum, Paraj; Dixon, Makayla; Zhang, Kevin; Mukhopadhyay, Rajit; Xu, Evan; Tewala, Lina; Manohar, Arin; Moss, Isaac; Clader, David; Schultz, Kevin; Quiroz, Gregory | We explore the problem of detecting a band-limited stochastic signal over background noise in the limit of low signal-to-noise ratio (SNR<<1). | Session 47: Quantum Metrology and Sensing |

975 | Weak Measurements of a Superconducting Qubit Reconcile Incompatible Observables | Monroe, Jonathan; Lee, Taeho; Yunger Halpern, Nicole; Murch, Kater | A weak measurement, we find, can reconcile two strong measurements’ incompatibility, via backaction on the state. | Session 47: Quantum Metrology and Sensing |

976 | Number-Resolved Photocounter for Propagating Microwave Mode | Dassonneville, Rémy; Assouly, Réouven; Peronnin, Théau; Rouchon, Pierre; Huard, Benjamin | We demonstrate a single-shot counter for propagating microwave photons that can resolve up to 3 photons. | Session 47: Quantum Metrology and Sensing |

977 | Counting Photons On-the-Fly with the Quantum Orchestration Platform | Ofek, Nissim; Dassonneville, Remy; Assouly, Réouven; Peronnin, Théau; Rouchon, Pierre; Sivan, Itamar; Drucker, Niv; Cohen, Yonatan; Huard, Benjamin | In this talk, we illustrate the use of the Quantum Orchestration Platform in a recent experiment demonstrating a number resolved photocounter for propagating microwave mode, which utilized complex real-time flow control and ultra-low latency feedback [1]. | Session 47: Quantum Metrology and Sensing |

978 | Sensing and remembering few-electron charges using an MoS2 nanoresonator | Dash, Aneesh; More, Swapnil; Arora, Nishta; Naik, Akshay | We experimentally demonstrate a nano-electromechanical bifurcation amplifier made of MoS 2, that can detect charge fluctuations less than 10 electrons in real-time at room temperature, in open-loop measurements. | Session 47: Quantum Metrology and Sensing |

979 | A SNAIL Travelling Wave Parametric Amplifier, Part I | Ranadive, Arpit; Esposito, Martina; Planat, Luca; Bonet, Edgar; Naud, Cécile; Buisson, Olivier; Guichard, Wiebke; Roch, Nicolas | We present the experimental demonstration of a novel Travelling Wave Parametric Amplifier (TWPA) composed of an array of superconducting nonlinear asymmetric inductive elements (SNAILs). | Session 47: Quantum Metrology and Sensing |

980 | A SNAIL Travelling Wave Parametric Amplifier, Part II | Ranadive, Arpit; Esposito, Martina; Planat, Luca; Bonet, Edgar; Naud, Cécile; Buisson, Olivier; Guichard, Wiebke; Roch, Nicolas | We present the experimental demonstration of a novel Travelling Wave Parametric Amplifier (TWPA) composed of an array of superconducting nonlinear asymmetric inductive elements (SNAILs). | Session 47: Quantum Metrology and Sensing |

981 | Phonons and Magnons in Organic Molecular Crystals as Dark Matter Targets | Harrelson, Thomas; Griffin, Sinead | From these structure factors, we present estimates of their reach as DM targets for well-motivated DM models. | Session 47: Quantum Metrology and Sensing |

982 | An Ultrasensitive Electrometer Operating at the Single-Photon Level | Brock, Benjamin; Li, Juliang; Kanhirathingal, Sisira; Blencowe, Miles; Rimberg, Alexander | We discuss the significance of these results, compare with theory, and discuss the factors limiting the charge sensitivity in practice. | Session 47: Quantum Metrology and Sensing |

983 | Beyond the standard quantum limit of parametric amplification | Renger, Michael; Pogorzalek, Stefan; Chen, Qiming; Nojiri, Yuki; Partanen, Matti; Marx, Achim; Gross, Rudolf; Deppe, Frank; Fedorov, Kirill | We show that, in theory, a maximum quantum efficiency of 1 can be reached. | Session 47: Quantum Metrology and Sensing |

984 | Real-time, adaptive quantum sensing with the Quantum Orchestration Platform | Halay, Nir; Aharon-Zohar, Inbar; Drucker, Niv; Sivan, Itamar; Ofek, Nissim; Cohen, Yonatan; Arshad, Muhammad; Bonato, Cristian; Finkler, Amit | Here we demonstrate how such protocols can be performed using Quantum Machines’ Quantum Orchestration Platform, which allows intuitive programming and significantly improved performance and feedback latency. | Session 47: Quantum Metrology and Sensing |

985 | Near-Deterministic Collective non-Linear Weak-Value Metrology | Vetrivelan, Muthumanimaran; Vinjanampathy, Sai | we resolve this completely by considering non-linear collective Hamiltonians and demonstrate that they enhance existing WVA schemes. | Session 47: Quantum Metrology and Sensing |

986 | Bipartite energy-time uncertainty relation and quantum error correction for metrology with noise | Faist, Philippe; Woods, Mischa; Albert, Victor; Renes, Joseph; Eisert, Jens; Preskill, John | Here, we consider a noiseless quantum system (a probe, or a clock) prepared in a pure state that encodes some time t, on which we apply an arbitrary noise channel. | Session 47: Quantum Metrology and Sensing |

987 | Quantum limit of superresolution with a noisy imaging system | Oh, Changhun; Zhou, Sisi; Wong, Yat; Jiang, Liang | As an example, we provide an analysis of the effect of noise on resolving two thermal objects. | Session 47: Quantum Metrology and Sensing |

988 | Fundamental limits of Spectroscopy with Quantum Light | Bisketzi, Evangelia; Datta, Animesh | By using the techniques of Quantum Estimation Theory (QET) we quantify this advantage for the estimation of parameters of matter. | Session 47: Quantum Metrology and Sensing |

989 | Optimal Measurement of Field Properties with Quantum Sensor Networks | Qian, Timothy; Bringewatt, Jacob; Boettcher, Igor; Bienias, Przemyslaw; Gorshkov, Alexey | We consider a quantum sensor network of qubit sensors coupled to a field f(x;θ) analytically parameterized by the vector of parameters θ. | Session 47: Quantum Metrology and Sensing |

990 | Quantum enhanced telescopes beyond the Gottesman protocol | Czupryniak, Robert; Steinmetz, John; Kwiat, Paul; Jordan, Andrew | Here we propose an entanglement-assisted interferometric procedure that can extract more information about the stellar source from each photon it emits when compared to the procedure given in [1]. | Session 47: Quantum Metrology and Sensing |

991 | Windchime: first steps towards realizing mechanical detector arrays for particle physics | Ghosh, Sohitri | Here we discuss the initial progress made by the Windchime collaboration, an interdisciplinary group of quantum sensing and particle physics researchers, in the construction and operation of an array of many mechanical sensors to search for dark matter. | Session 47: Quantum Metrology and Sensing |

992 | Neutron Optics Theory for Entangled Neutron Beams | Lu, Shufan; Dickerson, Kylie; Snow, William | We will discuss the steps we have taken toward this development [2,3] and present applications in neutron-antineutron oscillations under mirror reflection conditions [4]. | Session 47: Quantum Metrology and Sensing |

993 | Advantages of Mode-Entangled Neutrons in Quantum-Enhanced Measurements | McKay, Samuel; Baxter, David; Broholm, Collin; Irfan, Abu Ashik Md.; Kuhn, Stephen; Ortiz, Gerardo; Pynn, Roger; Shen, Jiazhou; Snow, William; Vangelista, Vincent | We present multi-mode entanglement of individual neutrons and suggest that beams of such neutrons may constitute a new quantum probe of materials. | Session 47: Quantum Metrology and Sensing |

994 | Qubit Quantum Metrology in the Regime of Limited Resources | Saunders, Jason; Van Huele, Jean-Francois | We introduce a Bayesian modeling framework for qubit quantum metrology. | Session 47: Quantum Metrology and Sensing |

995 | Tight bounds on the simultaneous estimation of incompatible parameters | Sidhu, Jasminder; Ouyang, Yingkai; Campbell, Earl; Kok, Pieter | In this work, we analytically solve the HCRB for two-parameters and find an analytic expression for the optimal measurement procedure. | Session 47: Quantum Metrology and Sensing |

996 | A Multiconfigurational Study of Negatively Charged Nitrogen-Vacancy Center in Diamond | Bhandari, Churna; Wysocki, Aleksander; Economou, Sophia; Dev, Pratibha; Park, Kyungwha | Taking advantage of the spatially localized nature of the defects, we apply multiconfigurational quantum-chemistry methods to a prototype point defect such as a negatively charged nitrogen-vacancy center in diamond. | Session 47: Quantum Metrology and Sensing |

997 | Optimal control and glassiness in quantum sensing | Timms, Christopher; Kolodrubetz, Michael | In particular, we investigate the ways in which the rough control landscape behaves as an analogue to a (classical) spin glass and comment on how this spin glass behavior can be applied to improve quantum sensing more broadly. | Session 47: Quantum Metrology and Sensing |

998 | Accelerating axionic dark matter searches through remote entanglement of microwave cavities | Jiang, Yue; Ruddy, Elizabeth; Brubaker, Benjamin; Wurtz, Kelly; Palken, Daniel; Lehnert, Konrad | We propose a method to increase the scan rate using a two-cavity setup, in which the axion cavity is coupled to an auxiliary readout cavity by simultaneous two-mode squeezing and state-swapping interactions. | Session 47: Quantum Metrology and Sensing |

999 | Single-mode quantum metrology enhanced by approximate quantum error correction | Wang, Weiting; Chen, Zijie; Liu, Xinyu; Cai, Weizhou; Ma, Yuwei; Hu, Ling; Xu, Yuan; Song, Yipu; Wang, Haiyan; zou, Chang-ling; Sun, Luyan | In this talk, we will present our recent efforts in quantum metrology via a bosonic mode. | Session 47: Quantum Metrology and Sensing |

1000 | Communication with a demountable quantum bus part 1 | Teoh, James; Burkhart, Luke; Zhang, Yaxing; Axline, Christopher; Frunzio, Luigi; Devoret, Michel; Jiang, Liang; Girvin, Steven; Schoelkopf, Robert | In this work, the low-loss standing wave mode of a demountable, all-superconducting coaxial cable is used as a quantum bus in a simple quantum network consisting of two 3D cavity bosonic qubits housed in separate modules. | Session 48: Quantum Networks: Distributed Quantum Computing |

1001 | Communication with a demountable quantum bus part 2: Entanglement via reservoir engineering | Cottet, Nathanael; Teoh, James; Burkhart, Luke; Frunzio, Luigi; Devoret, Michel; Schoelkopf, Robert | We report on an experiment that demonstrates this approach by symmetrically coupling two modules to a coaxial cable acting as a shared reservoir. | Session 48: Quantum Networks: Distributed Quantum Computing |

1002 | Fast and high-fidelity multi-qubit state transfer | Hong, Yifan; Lucas, Andrew | We describe a new quantum walk formalism to bound the growth of quantum operators. | Session 48: Quantum Networks: Distributed Quantum Computing |

1003 | Quantum Communication Between Distant Superconducting Circuits Combined With Fast, High-Fidelity Readout | Storz, Simon; Magnard, Paul; Schär, Josua; Kurpiers, Philipp; Besse, Jean-Claude; Reuer, Kevin; Gabureac, Mihai; Akin, Abdulkadir; Royer, Baptiste; Blais, Alexandre; Wallraff, Andreas | In this talk, we present the main challenges and a first implementation of a superconducting circuit fulfilling the aforementioned needs. | Session 48: Quantum Networks: Distributed Quantum Computing |

1004 | Extending Cryogenic Microwave Quantum Networks | Schär, Josua; Storz, Simon; Magnard, Paul; Kurpiers, Philipp; Luetolf, Janis; Marxer, Fabian; Frey, Melvin; Kohli, Niti; Schlatter, Reto; Fauquex, Alain; Wallraff, Andreas | In this talk, we present the design and concept of the cryogenic link we have developed. | Session 48: Quantum Networks: Distributed Quantum Computing |

1005 | Entanglement Generation in Nonreciprocal Systems | Orr, Lindsay; Khan, Saeed; Chang, C. W. Sandbo; Buchholz, Nils; Wilson, Christopher; Metelmann, Anja | In this talk we will address this question and discuss under which conditions a bipartite system can generate entanglement. | Session 48: Quantum Networks: Distributed Quantum Computing |

1006 | A Universal Quantum Gate Set Operating on Itinerant Microwave Photons | Reuer, Kevin; Besse, Jean-Claude; Wernli, Lucien; Magnard, Paul; Kurpiers, Philipp; Wallraff, Andreas; Eichler, Christopher | In this talk, we present absorption and re-emission-based, deterministic, photon-photon gates. | Session 48: Quantum Networks: Distributed Quantum Computing |

1007 | Microwave quantum teleportation | Fedorov, Kirill; Pogorzalek, Stefan; Renger, Michael; Chen, Qiming; Nojiri, Yuki; Partanen, Matti; Marx, Achim; Gross, Rudolf; Deppe, Frank | We demonstrate the successful realization of unconditional quantum teleportation in the microwave regime over the distance of 42 cm by exploiting two-mode squeezing and analog feedforward. | Session 48: Quantum Networks: Distributed Quantum Computing |

1008 | Modeling Networks of Superconducting Qubit Arrays from the Physical to Processing Layers | LaRacuente, Nicholas; Smith, Kaitlin; Imany, Poolad; Silverman, Kevin; Chong, Fred | Key is a high-level link model that reflects important physics while abstracting details. | Session 48: Quantum Networks: Distributed Quantum Computing |

1009 | Heterogeneous Multipartite Entanglement Purification for Size-Constrained Quantum Devices | Krastanov, Stefan; Sanchez de la Cerda, Alexander; Narang, Prineha | Here we present a heterogenous approach to entanglement distilation, in which simple small entangled states are directly used as the sacrificial distillation resource in the purification of larger much more expensive entangled resources. | Session 48: Quantum Networks: Distributed Quantum Computing |

1010 | Protocol of Quantum Communication Based on Shared Qubits | Li, Junxu; Kais, Sabre | We propose a protocol of quantum teleportation based on shared qubits. | Session 48: Quantum Networks: Distributed Quantum Computing |

1011 | Continuous-variable quantum microwave state transfer between two dilution refrigerators | Deppe, Frank; Fedorov, Kirill; Partanen, Matti; Renger, Michael; Pogorzalek, Stefan; Chen, Qiming; Nojiri, Yuki; Marx, Achim; Gross, Rudolf; van der Vliet, Harriet; Matthews, Anthony; Melhem, Ziad | As a viable alternative for quantum local area networks, we have set up a 6.6m long cryogenic link between one homemade and one Oxford Instruments Triton500 dilution refrigerator. | Session 48: Quantum Networks: Distributed Quantum Computing |

1012 | Deterministic multi-qubit entanglement in a quantum network | Zhong, Youpeng; Chang, Hung-Shen; Bienfait, Audrey; Dumur, Etienne; Chou, Ming-Han; Conner, Christopher; Grebel, Joel; Povey, Rhys; Yan, Haoxiong; Schuster, David; Cleland, Andrew | Here, we report a quantum network comprising two separate superconducting quantum nodes connected by a 1 meter-long coaxial cable, where each node includes three qubits. | Session 48: Quantum Networks: Distributed Quantum Computing |

1013 | Decomposition of tripartite graph states | Wong, Yat; Zhong, Changchun; Jiang, Liang | We shed light on this problem by presenting a methodto decompose tripartite graph states into Bell pairs and GHZ states through a series of Clifford operations in eachsubsystem, and hence showing that entanglement of tripartite graph states can be fully characterized with 4 numbers;the number of Bell pairs between each pair of subsystems and the number of GHZ states shared by all subsystems. | Session 48: Quantum Networks: Distributed Quantum Computing |

1014 | Tripartite entanglement shaping in stabilizer formalism | Zhong, Changchun; Wong, Yat; Jiang, Liang | In this project, we focus on tripartite entanglement structure of stabilizer state and its transformation through local operations. | Session 48: Quantum Networks: Distributed Quantum Computing |

1015 | Approximate quantum circuit synthesis using block encodings | Camps, Daan; Van Beeumen, Roel | We propose a novel approximate quantum circuit synthesis technique by relaxing the unitary constraints and interchanging them for ancilla qubits via block encodings. | Session 49: Quantum Software and Compilers I – Program Optimizations |

1016 | QFAST: Quantum Synthesis Using a Hierarchical Continuous Circuit Space | Younis, Ed; Lavrijsen, Wim; Sen, Koushik; Yelick, Katherine; Iancu, Costin | We present QFAST, a quantum synthesis tool designed to produce short circuits and to scale well in practice. | Session 49: Quantum Software and Compilers I – Program Optimizations |

1017 | LEAP: Scaling Numerical Optimization Based Synthesis Using an Incremental Approach | Smith, Ethan; Davis, Marc; Larson, Jeffrey; Iancu, Costin | Synthesis provides a valuable tool for quantum circuit optimization.The best techniques combine numerical optimization with search over structures, but face scalability challenges due to: 1) large number of of parameters; 2) exponential search space; and 3) complex objective function. | Session 49: Quantum Software and Compilers I – Program Optimizations |

1018 | Scalable Quantum Circuit Optimization Using Automated Synthesis | Wu, Xin-Chuan; Iancu, Costin; Chong, Fred | We describe a scalable technique for circuit optimization, with emphasis on depth reduction. | Session 49: Quantum Software and Compilers I – Program Optimizations |

1019 | Circuit Optimization for Simulations of Quantum Systems | Gui, Kaiwen; Tomesh, Teague; Gokhale, Pranav; Shi, Yunong; Martonosi, Margaret; Suchara, Martin; Chong, Fred | We demonstrate a new technique that simultaneously reduces (i) Trotterization errors by reordering terms in the Hamiltonian, and (ii) gate error accumulation by achieving gate cancellation. | Session 49: Quantum Software and Compilers I – Program Optimizations |

1020 | Automatic Shuttling Sequence Generation for a Linear Ion Trap Computer | Durandau, Jonathan; Brunet, Charles-Antoine; Poschinger, Ulrich; Mailhot, Frederic; Bérubé-Lauzière, Yves | We discuss the architecture of the linear segmented ITQC, associated constraints, and the We present an algorithm to automate the generation of shuttling sequences from the description of complexity of shuttling ions. | Session 49: Quantum Software and Compilers I – Program Optimizations |

1021 | Discontinuous Galerkin method with Voronoi partitioning for Quantum Simulation of Chemistry | Faulstich, Fabian; Wu, Xiaojie; Lin, Lin | We extend this approach to be applicable to molecular and crystalline systems of arbitrary geometry [2], using the flexibility of the planewave dual basis set and combining the DG procedure with a general partitioning strategy based on the Voronoi decomposition. | Session 49: Quantum Software and Compilers I – Program Optimizations |

1022 | Minimizing estimation runtime on noisy quantum computers | Johnson, Peter; Wang, Guoming; Enshan Koh, Dax; Cao, Yudong | We present an estimation algorithm tailored to practical implementation by incorporating noise models into its design and optimizing for minimal runtime. | Session 49: Quantum Software and Compilers I – Program Optimizations |

1023 | Nomination for invited speaker for DQI: Isaac Chuang | Chuang, Isaac | Nomination for invited speaker for DQI: Isaac Chuang | Session 49: Quantum Software and Compilers I – Program Optimizations |

1024 | Reinforcement learning for quantum circuit optimization | Foesel, Thomas; Niu, Murphy Yuezhen; Marquardt, Florian; Li, Li | To address this point, we propose a novel approach to quantum circuit optimization based on reinforcement learning, a powerful machine-learning technique which has already helped, for example, to achieve super-human performance in the board game Go [3]. | Session 49: Quantum Software and Compilers I – Program Optimizations |

1025 | Towards Constant-Depth Circuits for Dynamic Simulations of Materials on Quantum Computers | Bassman, Lindsay; Van Beeumen, Roel; Smith, Ethan; Younis, Ed; De Jong, Wibe; Iancu, Costin | Here, we present work towards developing constant-depth circuits for dynamic simulations under special classes of Hamiltonians. | Session 49: Quantum Software and Compilers I – Program Optimizations |

1026 | Error-robust controls in quantum algorithms | Mishra, Anurag; Ball, Harrison; Hush, Michael; Biercuk, Michael | In this talk, we will focus on the impact of using such validated control techniques on the performance of the variational quantum eigensolver (VQE). | Session 49: Quantum Software and Compilers I – Program Optimizations |

1027 | Optimized quantum solutions for vehicle routing problems | Shabani, Alireza; Bentley, Christopher; Carvalho, Andre; Biercuk, Michael; Hush, Michael | We address this issue by constructing algorithms with tailored gates that are robust against typical hardware imperfections. | Session 49: Quantum Software and Compilers I – Program Optimizations |

1028 | Quantify: An open-source framework for operating quantum computers in the NISQ era | Rol, Michiel Adriaan; Attryde, Callum; van Oven, Jules C.; Loh, Kelvin; Gloudemans, Jordy; Negîrneac, Victor; Last, Thorsten; Bultink, Cornelis Christiaan | Here, we present Quantify, a robust and extensively documented open-source experiment platform inspired by PycQED (Rol et al. 10.5281/zenodo.160327). | Session 50: Quantum Software and Compilers II – Compute Frameworks and Program Representations |

1029 | General-Purpose firmware for controlling quantum processors | Tholen, Mats; Borgani, Riccardo; Haviland, David | We present a general-purpose firmware for the Xilinx Zynq UltraScale+ RFSoC platform which allows for flexible implementation of quantum readout and control sequences through a Python API. | Session 50: Quantum Software and Compilers II – Compute Frameworks and Program Representations |

1030 | Exponential Information Compression with Quantum Contextual Redundancy | Gatti, Giancarlo; Huerga, Daniel; Solano, Enrique; Sanz, Mikel | We propose a protocol to store exponential amounts of classical information in the measurement statistics of a set of eigenstates of many-body Pauli observables. | Session 50: Quantum Software and Compilers II – Compute Frameworks and Program Representations |

1031 | Fast simulation of quantum algorithms using circuit optimization | Guerreschi, Gian Giacomo | Here, we demonstrate the advantage of co-developing and integrating simulators and compilers by proposing a specialized compiler pass to reduce the simulation time for arbitrary circuits. | Session 50: Quantum Software and Compilers II – Compute Frameworks and Program Representations |

1032 | Qaintum: A Julia-based Simulation Framework for Quantum Circuits | Huang, Qunsheng; Medina, Ismael; Cruz, Esther; Cho, Shin Ho; Mendl, Christian | We introduce “Qaintum”, a Julia-based software framework for quantum circuit simulation and optimization that can also be integrated into classical machine learning toolboxes. | Session 50: Quantum Software and Compilers II – Compute Frameworks and Program Representations |

1033 | Hamiltonian Open Quantum System Toolkit (HOQST) | Chen, Huo; Lidar, Daniel | We present an open-source software package called "Hamiltonian Open Quantum System Toolkit" (HOQST), a collection of tools for the investigation of open quantum system dynamics in Hamiltonian quantum computing, including both quantum annealing and the gate-model of quantum computing. | Session 50: Quantum Software and Compilers II – Compute Frameworks and Program Representations |

1034 | QTensor: Fast QAOA Quantum Simulator | Lykov, Danylo; Alexeev, Yuri; Ibrahim, Cameron; Galda, Alexey | We present a quantum circuit simulator* designed to execute large QAOA quantum circuits. | Session 50: Quantum Software and Compilers II – Compute Frameworks and Program Representations |

1035 | On the Quantum LINPACK Benchmark | Dong, Yulong; Lin, Lin; Whaley, Birgitta | We propose an input model called the RAndom Circuit Block-Encoded Matrix (RACBEM), which is a proper generalization of a dense random matrix in the quantum setting. | Session 50: Quantum Software and Compilers II – Compute Frameworks and Program Representations |

1036 | Programming a Quantum Computer with Quantum Instructions (Part 2): Demonstration and Characterization | Schwartz, Mollie; Kjaergaard, Morten; Greene, Amy; Samach, Gabriel; Bengtsson, Andreas; O’Keeffe, Michael; McNally, Chris; Braumueller, Jochen; Kim, David; Krantz, Philip; Marvian, Milad; Melville, Alexander; Niedzielski, Bethany; Sung, Youngkyu; Winik, Roni; Yoder, Jonilyn; Rosenberg, Danna; Obenland, Kevin; Lloyd, Seth; Orlando, Terry; Marvian, Iman; Gustavsson, Simon; Oliver, William | In this work, we execute a quantum program – density matrix exponentiation (DME) – that uses quantum instructions to process quantum data. | Session 50: Quantum Software and Compilers II – Compute Frameworks and Program Representations |

1037 | Universal Quantum Intermediate Representation | Heim, Bettina | To that end, we present an LLVM-based Quantum Intermediate Representation (QIR) intended to serve as a universal interface between programming languages and targeted backends. | Session 50: Quantum Software and Compilers II – Compute Frameworks and Program Representations |

1038 | Parallel hybrid quantum-classical compute model | McCaskey, Alexander; Claudino, Daniel; Nguyen, Thien; Liakh, Dmitry | Here we report our findings in simulations with the variational quantum eigensolver algorithm, where different terms of the problem Hamiltonian are measured concurrently. | Session 50: Quantum Software and Compilers II – Compute Frameworks and Program Representations |

1039 | Booting a quantum computer: A QUA-based graph framework for automatic qubit calibration, measurement, and execution of hybrid classical-quantum algorithms | Winer, Gal; Tomarken, Spencer; Mitnikov, Ilan; Strauss, Arthur; Frankel, Steven; DuBois, Jonathan; Ella, Lior; Cohen, Yonatan | We have developed an open-source framework which allows arranging and executing quantum and classical experimental steps as a directed acyclic graph (DAG). | Session 50: Quantum Software and Compilers II – Compute Frameworks and Program Representations |

1040 | Programming a Quantum Computer with Quantum Instructions (Part 1): Introduction and construction | Kjaergaard, Morten; Schwartz, Mollie; Greene, Amy; Samach, Gabriel; Bengtsson, Andreas; O’Keeffe, Michael; McNally, Chris; Braumueller, Jochen; Kim, David; Krantz, Philip; Marvian, Milad; Melville, Alexander; Niedzielski, Bethany; Sung, Youngkyu; Winik, Roni; Yoder, Jonilyn; Rosenberg, Danna; Obenland, Kevin; Lloyd, Seth; Orlando, Terry; Marvian, Iman; Gustavsson, Simon; Oliver, William | In this work, we execute a quantum program–density matrix exponentiation (DME)–that uses quantum instructions to process quantum data. | Session 50: Quantum Software and Compilers II – Compute Frameworks and Program Representations |

1041 | Quantum thermal machines powered by correlated baths | De Chiara, Gabriele; Antezza, Mauro | We consider thermal machines powered by locally equilibrium reservoirs that share classical or quantum correlations. | Session 51: Quantum Thermodynamics |

1042 | Superconducting-like heat current: Effective cancellation of current-dissipation trade off by quantum coherence | Tajima, Hiroyasu; Funo, Ken | Here we establish a universal framework clarifying how quantum coherence affects the current-dissipation trade-off relation: proper use of coherence enhances the heat current without increasing dissipation, i.e. coherence can reduce friction. | Session 51: Quantum Thermodynamics |

1043 | Geometry of thermal states – thermodynamics of quantum and classical coherence | Sone, Akira; Deffner, Sebastian | We discuss fluctuation theorems for the conditional stochastic work within the geometric approach, for both quantum and classical dynamics. | Session 51: Quantum Thermodynamics |

1044 | Action Quantum Speed Limits | O’Connor, Eoin; GUARNIERI, GIACOMO; Campbell, Steve | We introduce action QSLs as a family of bounds on the minimal time to connect two states that, unlike the usual geometric approach, crucially depend on how the path is traversed, i.e. on the instantaneous speed. | Session 51: Quantum Thermodynamics |

1045 | Quantum fluctuations hinder finite-time information erasure near the Landauer limit | Miller, Harry; GUARNIERI, GIACOMO; Mitchison, Mark; Goold, John | Here we show that this can have significant thermodynamic implications. | Session 51: Quantum Thermodynamics |

1046 | Detecting the origins of quantum heat in a circuit QED system | Szombati, Daniel; Stevens, Jeremy; Cottet, Nathanael; Zeppetzauer, Stefan; Ficheux, Quentin; Jezouin, Sebastien; Elouard, Cyril; Maffei, Maria; Auffèves, Alexia; Jordan, Andrew; Bienfait, Audrey; Huard, Benjamin | Here, using a circuit QED transmon system in the dispersive limit, we aim to measure and quantify the origins of quantum heat. | Session 51: Quantum Thermodynamics |

1047 | Quantum theory of triboelectricity | Alicki, Robert; Jenkins, Alejandro | We propose a microphysical theory of the triboelectric effect by which mechanical rubbing separates charges across the interface between two surfaces. | Session 51: Quantum Thermodynamics |

1048 | Global vs local bath in superconducting waveguide QED experiments. | Sharafiev, Aleksei; Juan, Mathieu; Atanasova, Desislava; Zanner, Maximilian; Kirchmair, Gerhard | In this work we investigate the problem in the context of 3D waveguide Quantum Electrodynamics (wQED). | Session 51: Quantum Thermodynamics |

1049 | Entanglement renormalization of thermofield double states | Lin, Cheng-Ju; Hsieh, Timothy | As proof of concept, we apply this technique to the two-dimensional toric code model at finite temperature and find an exact renormalization group circuit which connects the finite-temperature toric code model to the infinite temperature state, thus demonstrating the absence of finite temperature topological order for 2d toric code. | Session 51: Quantum Thermodynamics |

1050 | Quantum chaos and information processing with kicked p-spin models | Munoz, Manuel; Poggi, Pablo; Deutsch, Ivan | We introduce a family of kicked collective spin models describing an ensemble of spin-1/2 particles with p-body interactions. | Session 51: Quantum Thermodynamics |

1051 | Cryptography based on Landauer’s principle | Coiteux-Roy, Xavier; Wolf, Stefan | We define a theoretical model — a classical-information world in which exponentially large randomized memories are accessible, and reversible computation is effortless, but free energy is severely limited — and present in its context an information-theoretically secure protocol for 1-out-of-2 oblivious transfer. | Session 51: Quantum Thermodynamics |

1052 | Rolf Landauer and Charles H. Bennett Award in Quantum Computing (2020): Realizations with Superconducting Qubits | Brandao, Fernando | Rolf Landauer and Charles H. Bennett Award in Quantum Computing (2020): Realizations with Superconducting Qubits | Session 51: Quantum Thermodynamics |

1053 | Role of finite memory in quantum cooling | Taranto, Philip; Bakhshinezhad, Faraj; Schuettelkopf, Philipp; Clivaz, Fabien; Huber, Marcus | Here, we incorporate memory via a generalized collision model to analyze its role in quantum cooling. | Session 51: Quantum Thermodynamics |

1054 | Autonomous entanglement engines | Haack, Geraldine | In this talk, I would like to take a step back, and simply discuss the possibility of exploiting out-of-equilibrium thermal environments, without any control, to generate quantum correlations among two or more qubits or higher-dimensional quantum systems. | Session 51: Quantum Thermodynamics |

1055 | Measuring entanglement in a quantum heat engine | van Steensel, Alwin; Ansari, Mohammad | We study how entanglement in a quantum heat engine can impact its non-equilibrium thermodynamics. | Session 51: Quantum Thermodynamics |

1056 | Quantum Process Inference for a Single Qubit Maxwell’s demon | Song, Xingrui; Naghiloo, Mahdi; Murch, Kater | Here, we carefully analyze the relation between these two quantities and find that they are not maximized simultaneously, requiring different feedback protocols. | Session 51: Quantum Thermodynamics |

1057 | Tensor-Network Method to Simulate Strongly Interacting Quantum Thermal Machines | Mendoza-Arenas, Juan; Brenes, Marlon; Purkayastha, Archak; Mitchison, Mark; Clark, Stephen; Goold, John | We present a methodology to simulate the quantum thermodynamics of thermal machines which are built from an interacting working medium in contact with fermionic reservoirs at a fixed temperature and chemical potential. | Session 51: Quantum Thermodynamics |

1058 | Information scrambling vs. decoherence — two competing sinks for entropy | Touil, Akram; Deffner, Sebastian | In this work, we develop key steps towards a thermodynamic description of information scrambling in open quantum systems. | Session 51: Quantum Thermodynamics |

1059 | Hilbert-Space Fragmentation of an Embedded Fredkin Spin Chain | Langlett, Christopher; Xu, Shenglong | The model we study embeds the zero-energy ground into the middle of the spectrum resulting in a dramatic effect on the Hilbert space structure. | Session 51: Quantum Thermodynamics |

1060 | Quantum Symmetry Detection Using an Anyonic Plasmon Engine | Myers, Nathan; Menges, Fabian; Deffner, Sebastian | To this end, we propose an experimental implementation of a continuous quantum engine utilizing a working medium of anyonic plasmons. | Session 51: Quantum Thermodynamics |

1061 | Information driven double quantum-dot engine fueled by entanglement between electron spins | Josefsson, Martin; Leijnse, Martin | We propose a thermodynamic quantum engine that exploits this principle and consists of two electrons on a double quantum dot (QD) [1]. | Session 51: Quantum Thermodynamics |

1062 | Work Estimation and Work Fluctuations in the Presence of Non-Ideal Measurements | Debarba, Tiago; Manzano, Gonzalo; Guryanova, Yelena; Huber, Marcus; Friis, Nicolai | We investigate the consequences for the estimation of work in non-equilibrium processes and the fundamental structure of the fluctuations when one assumes that the measurements are non-ideal. | Session 51: Quantum Thermodynamics |

1063 | Topological effects on the thermodynamics of open quantum systems | Stafford, Charles; Xu, Yiheng; Evers, Ferdinand | Topological effects on the thermodynamics of open quantum systems | Session 51: Quantum Thermodynamics |

1064 | Andreev reflecting black holes: a black hole analogy in solid state. | Kizhakkumpurath Manikandan, Sreenath; Jordan, Andrew | We present a microscopic quantum description for Hawking radiation as analogous to Andreev mode conversions from a superconductor/normal metal interface. | Session 51: Quantum Thermodynamics |

1065 | Heat transport in overdamped quantum systems | Kadijani, Sadeq. S; Schmidt, Thomas; Esposito, Massimiliano; Freitas, Nahuel | In this work we obtain an analytical expression for the heat current between two overdamped quantum oscillators interacting with local thermal baths at different temperatures. | Session 51: Quantum Thermodynamics |

1066 | Measuring Out-of-Time-Order Correlators with Projected Revivability | Richman, Brittany; Tran, Minh; Taylor, Jacob | We propose a protocol to measure the OTOC using an auxillary quantum bit. | Session 51: Quantum Thermodynamics |

1067 | Realizing large, tunable dispersive shifts with parametric couplings – Part I | Xiao, Zhihao; Noh, Taewan; Doucet, Emery; Ranzani, Leonardo; Govia, Luke; Simmonds, Raymond; Aumentado, Jose; Kamal, Archana | In this talk, we will present a method that allows system diagonalization in the presence of such strong parametric interactions. | Session 52: Qubit Measurement |

1068 | Realizing large, tunable dispersive shifts with parametric couplings – Part II | Noh, Taewan; Xiao, Zhihao; Doucet, Emery; Ranzani, Leonardo; Govia, Luke; Kamal, Archana; Aumentado, Jose; Simmonds, Raymond | With the theoretical backbone for understanding strong parametric dispersive interactions covered in the previous talk, we will focus on describing our experiments with a transmon qubit coupled to a cavity via a dc-SQUID. | Session 52: Qubit Measurement |

1069 | Continuous phase preserving measurement of a quantum N-level system | Das, Debmalya; Steinmetz, John; Jordan, Andrew; Siddiqi, Irfan | We present an analysis of the continuous monitoring of a quantum N-level system using phase-preserving measurements. | Session 52: Qubit Measurement |

1070 | Single-shot number-resolved detection of microwave photons with error mitigation | Curtis, Jacob; Hann, Connor; Elder, Salvatore; Wang, Christopher; Frunzio, Luigi; Jiang, Liang; Schoelkopf, Robert | Here, we present a single-shot, high-fidelity photon number-resolving detector of up to 15 microwave photons in a cavity-qubit circuit QED platform. | Session 52: Qubit Measurement |

1071 | Complete quantum tomography for QND detectors and generalization of QNDness. | Pereira, Luciano; Ramos, Tomas; Garcia-Ripoll, Juan Jose | In this work, we propose an unbiased tomographic protocol to fully characterize a QND detector, which provides us the POVM elements associated with the measurement, as well as the processes that define the state after the measurement. | Session 52: Qubit Measurement |

1072 | Circuit optimization to improve transmon qubit readout via cross-Kerr coupling | Milchakov, Vladimir; Guerra, Timothee; Dassonneville, Remy; Planat, Luca; Ramos, Tomas; Charpentier, Thibault; Foroughi, Farshad; Buisson, Olivier; Roch, Nicolas; Guichard, Wiebke; Naud, Cécile; Garcia-Ripoll, Juan Jose | We will present the readout performance based on the cross-Kerr coupling of the improved transmon circuit. | Session 52: Qubit Measurement |

1073 | Fast high fidelity quantum non-demolition superconducting qubit readout | Dassonneville, Remy; Milchakov, Vladimir; Ramos, Tomas; Planat, Luca; Naud, Cécile; Garcia-Ripoll, Juan Jose; Hasch-Guichard, Wiebke; Roch, Nicolas; Buisson, Olivier | To overcome this, we propose and experimentally demonstrate a new readout scheme based on a transmon molecule inserted inside a 3D-cavity _[1,2]. | Session 52: Qubit Measurement |

1074 | Unconditional reset of a qubit readout resonator using multichannel driving | Gunyhó, András; Kundu, Suman; Ikonen, Joni; Li, Tianyi; Möttönen, Mikko | We present results from numerical simulations and from experiments on a typical circuit QED system. | Session 52: Qubit Measurement |

1075 | Quantum reservoir computing using weakly-nonlinear Josephson junction networks under homodyne measurement | Khan, Saeed; Angelatos, Gerasimos; Tureci, Hakan | We analyze a model for quantum reservoir computing for quantum state classification based on single-shot measurements of a small-scale weakly-nonlinear quantum reservoir computer that is directly coupled to the quantum system of interest. | Session 52: Qubit Measurement |

1076 | A generalized figure of merit for qubit readout | D’Anjou, Benjamin | These results provide a unified framework for qubit readout and should facilitate optimization and engineering of near-term quantum devices across all platforms. | Session 52: Qubit Measurement |

1077 | Improving the fidelity of multiplexed dispersive readout via optimal resonator control | Ella, Lior; Halay, Nir; Cohen, Yonatan | We show how these techniques can improve readout fidelity in single and multiple qubit measurement settings and discuss their implementation on the Quantum Machines Quantum Orchestration Platform. | Session 52: Qubit Measurement |

1078 | Machine Learning Assisted Superconducting Qubit Readout – Part I: From Pulse Shaping to State Discrimination | Lienhard, Benjamin; Hoffer, Cole; Vepsäläinen, Antti; Govia, Luke; Qiu, Yanjie; Kim, David; Winik, Roni; Melville, Alexander; Niedzielski, Bethany; Yoder, Jonilyn; Ohki, Thomas; Krovi, Hari; Orlando, Terry; Gustavsson, Simon; Oliver, William | Here, we experimentally demonstrate deep machine learning techniques to improve superconducting qubit readout pulse shapes and discrimination compared to conventional methods. | Session 52: Qubit Measurement |

1079 | Machine Learning Assisted Superconducting Qubit Readout – Part II: Deep Reinforcement Learning | Hoffer, Cole; Lienhard, Benjamin; Vepsäläinen, Antti; Govia, Luke; Andersen Woltz, Vilhelm; Kim, David; Melville, Alexander; Niedzielski, Bethany; Yoder, Jonilyn; Ohki, Thomas; Krovi, Hari; Orlando, Terry; Oliver, William | We present a pulse shaping optimization module using deep reinforcement learning (DRL). | Session 52: Qubit Measurement |

1080 | Hardware efficient quantum computing using repetition cat qubits. | Guillaud, Jeremie; Mirrahimi, Mazyar | In this talk, I will present the key points of the approach and give estimates of the expected performance based on numerical simulations of the circuits including realistic error models for all the gates and operations. | Session 53: Recent Advances with Superconducting Circuits |

1081 | Experimental realization of the soft 0-π qubit | Gyenis, Andras; Mundada, Pranav; Di Paolo, Agustin; Hazard, Thomas; You, Xinyuan; Schuster, David; Koch, Jens; Blais, Alexandre; Houck, Andrew | Using a Raman-type protocol, we exploit a higher-lying charge-insensitive energy level of the device to realize coherent population transfer and logical operations. | Session 53: Recent Advances with Superconducting Circuits |

1082 | Optical photon generation from a superconducting qubit | Sipahigil, Alp | In this talk, I will present our recent experiments demonstrating quantum transduction of a superconducting qubit excitation to an optical photon [1]. | Session 53: Recent Advances with Superconducting Circuits |

1083 | Stabilization and operation of a Kerr-cat qubit. | Grimm, Alexander; Frattini, Nicholas; Puri, Shruti; Mundhada, Shantanu; Touzard, Steven; Mirrahimi, Mazyar; Girvin, Steven; Shankar, Shyam; Devoret, Michel | In this talk, I will present our recent experimental results on the stabilization of an error-protected cat qubit through the interplay between Kerr nonlinearity and single-mode squeezing in a superconducting microwave resonator. | Session 53: Recent Advances with Superconducting Circuits |

1084 | Multimode photon blockade | Chakram, Srivatsan; He, Kevin; Dixit, Akash; Oriani, Andrew; Naik, Ravi; Leung, Nelson; Kwon, Hyeokshin; Ma, Wen-Long; Jiang, Liang; Schuster, David | We present a new non-local many-body interaction between microwave photons stored in the electromagnetic modes of a multimode cavity [1]. | Session 53: Recent Advances with Superconducting Circuits |

1085 | Low-frequency spectroscopy for quantum multilevel systems | Ryzhov, Artem; Shevchenko, Sergey; Nori, Franco | In the case of a multilevel system with an avoided-level crossing of the two lower levels, we demonstrate that the shape of the resonances can change from convex arcs to concave heart-shaped and harp-shaped resonance lines. | Session 54: Semiconductor Qubits |

1086 | Theory of valley splitting and valley-induced relaxation of a single silicon spin qubit in the presence of interface disorder | Hosseinkhani, Amin; Burkard, Guido | We study in detail how the valley splitting depends on the electric and magnetic fields for both ideal and disordered Si/SiGe interfaces. | Session 54: Semiconductor Qubits |

1087 | Protecting Quantum Information in Quantum Dot Spin Chains by Driving Exchange Interactions Periodically | Van Dyke, John; Kandel, Yadav; Qiao, Haifeng; Nichol, John; Economou, Sophia; Barnes, Edwin | We analyze a new type of discrete time crystalline behavior that is obtained by periodically driving exchange interactions in a Heisenberg spin chain. | Session 54: Semiconductor Qubits |

1088 | Impact of valley phases on exchange interaction in silicon double quantum dots | Tariq, Bilal; Hu, Xuedong | Here we investigate how the valley phases affect the exchange interaction in a symmetric two-electron silicon double quantum dot. | Session 54: Semiconductor Qubits |

1089 | Silicon quantum dot devices for scalable quantum computing | Geyer, Simon; Camenzind, Leon; Czornomaz, Lukas; Deshpande, Veeresh; Fuhrer, Andreas; Warburton, Richard; Zumbuhl, Dominik; Kuhlmann, Andreas | We study hole transport through a double QD and observe Pauli spin blockade (PSB). | Session 54: Semiconductor Qubits |

1090 | Spin shuttling in a silicon double quantum dot | Ginzel, Florian; Mills, Adam; Petta, Jason; Burkard, Guido | Here we theoretically study a minimal version of spin shuttling between two quantum dots (QDs) occupied by one electron. | Session 54: Semiconductor Qubits |

1091 | Exploring single Ti/Pd gate layer MOS devices as diagnostic qubits | Hong, Yanxue; Ramanayaka, Aruna; Stein, Ryan; Stewart, Michael; Pomeroy, Joshua | We observed quantum dots forming in the device channel and gate capacitances consistent with modelling, so that dot positions can be located by triangulation in capacitance modelling. | Session 54: Semiconductor Qubits |

1092 | Building and Characterizing Orthogonal Gates in a SiMOS S-T Qubit | West, Anderson; Albrecht, Dylan; Jacobson, Noah; Palomaki, Tauno; Jock, Ryan; Luhman, Dwight | In this work, we demonstrate a set of orthogonal gates that are optimal electrical control solutions incorporating composite exchange and spin-orbit dominated gates. | Session 54: Semiconductor Qubits |

1093 | Development of Integrated Device Simulator for Silicon Quantum Bit Design | Asai, Hidehiro; Iizuka, Shota; Ikegami, Tsutomu; Hattori, Junichi; Fukuda, Koich; Oka, Hiroshi; Kato, Kimihiko; Ota, Hiroyuki; Mori, Takahiro | In this presentation, we integrate newly developed methods for qubit simulation into a single device simulation platform and perform self-consistent simulations of qubit characteristics considering a whole device structure. | Session 54: Semiconductor Qubits |

1094 | Controlling and measuring quantum dot qubits in Si/SiGe heterostructures | Eriksson, Mark | In this talk I describe two recent advances in the control and measurement of Si/SiGe quantum dot qubits. | Session 54: Semiconductor Qubits |

1095 | Toward scalable spin qubits: Si/SiGe quantum dot devices built on a 300mm process line | Mueller, Brennen; Bojarski, Stephanie; George, Hubert C; Henry, Eric; Zietz, Otto; Neyens, Samuel; Watson, Thomas; Nahm, Rambert; Amin, Payam; Caudillo, Roman; Pillarisetty, Ravi; Kotlyar, Roza; Lampert, Lester; Luthi, Florian; Torres, Jessica; Roberts, Jeanette; Clarke, Jim | In this talk, we present a planar device architecture built on a 300mm platform that does not rely on fins for confinement. | Session 54: Semiconductor Qubits |

1096 | All Optical 300mm process line for spin qubit devices | George, Hubert C; Bojarski, Stephanie; Henry, Eric; Mueller, Brennen; Pillarisetty, Ravi; Michalak, David; Watson, Thomas; Lampert, Lester; Neyens, Samuel; Zietz, Otto; Caudillo, Roman; Luthi, Florian; Kotlyar, Roza; Roberts, Jeanette; Clarke, Jim | In this talk, we will provide an overview of integration scheme and yield. | Session 54: Semiconductor Qubits |

1097 | Systematic charge noise characterization of Intel quantum dot devices | Luthi, Florian; Caudillo, Roman | A key challenge in this endeavor is reducing the effect of noise on the spin qubits to an acceptable level. | Session 54: Semiconductor Qubits |

1098 | A four-qubit germanium quantum processor | Hendrickx, Nico; Lawrie, Will; Russ, Maximilian; van Riggelen, Floor; de Snoo, Sander; Schouten, Raymond; Sammak, Amir; Scappucci, Giordano; Veldhorst, Menno | We perform one, two, three, and four qubit logic for all qubit combinations, realizing a compact and high-connectivity circuit. | Session 54: Semiconductor Qubits |

1099 | A depletion mode hole spin-qubit in Ge | Jirovec, Daniel | We observe fast electrically controlled X and Z-rotations exceeding 100 MHz with dephasing times of 1 μs which we extend beyond 10 μs with echo techniques. | Session 54: Semiconductor Qubits |

1100 | Cavity control over heavy-hole spin qubits in inversion-symmetric crystals | Mutter, Philipp; Burkard, Guido | Choosing the exemplary material Germanium, we derive an effective cavity-mediated ground state spin coupling that harnesses the cubic Rashba spin-orbit interaction. | Session 54: Semiconductor Qubits |

1101 | A hot hole spin qubit in a silicon FinFET | Geyer, Simon; Camenzind, Leon; de Kruijf, Mathieu; Fuhrer, Andreas; Warburton, Richard; Zumbuhl, Dominik; Kuhlmann, Andreas | Here, we demonstrate a hole spin qubit integrated in a silicon fin-field effect transistor (FinFET)[Geyer et al., arXiv:2007.15400 (2020)] operating at temperatures as high as 4.2K. Spin-orbit mediated electric-dipole spin resonance is used for fast (150MHz) all-electrical qubit control. | Session 54: Semiconductor Qubits |

1102 | Pseudospin-electric coupling for holes beyond the envelope-function approximation | Coish, Bill; Philippopoulos, Pericles; Chesi, Stefano; Culcer, Dimitrie | We have calculated [1] the electric-dipole (pseudospin-electric) coupling between heavy and light holes in GaAs from first principles. | Session 54: Semiconductor Qubits |

1103 | Quantum coherence benchmarks and coherent control of hole spin qubits in a 2×2 germanium quantum dot array | Lawrie, William Iain; Hendrickx, Nico; Van Riggelen, Floor; Russ, Maximilian; Petit, Luca; Sammak, Amir; Scappucci, Giordano; Veldhorst, Menno | Here, we build on this momentum, reporting hole spin qubits with the longest spin relaxation times and dephasing times ever measured in the platform, and investigate their magnetic field dependence, concluding that spin decoherence does not constitute a road block for quantum information processing with hole spins in germanium. | Session 54: Semiconductor Qubits |

1104 | Measurement of the out-of-plane g-factor in strained Ge/SiGe using single-hole quantum dots | Miller, Andrew; Brickson, Mitchell; Hardy, Will; Liu, Chia-You; Li, Jiun-Yun; Baczewski, Andrew; Lilly, Michael; Lu, Tzu-Ming; Luhman, Dwight | Here we present an experimental measurement of the out-of-plane g-factor in this material for a single hole confined to a quantum dot, which avoids the strong orbital effects that can occur in this configuration. | Session 54: Semiconductor Qubits |

1105 | Light-Hole States in Highly Tensile-Strained Ge Quantum Well | Attiaoui, Anis; Assali, Simone; Del-Vecchio, Patrick; Moutanabbir, Oussama | To harness these largely unexplored advantages of LH states, we present a new low-dimensional system consisting of highly tensile strained Ge quantum well grown on Si wafers using GeSn as barriers. | Session 54: Semiconductor Qubits |

1106 | Isotropic and Anisotropic g-factor Corrections in GaAs Quantum Dots | Camenzind, Leon; Svab, Simon; Stano, Peter; Yu, Liuqi; Zimmerman, Jeramy; Gossard, Arthur; Loss, Daniel; Zumbuhl, Dominik | Here, we experimentally determine isotropic and anisotropic g-factor corrections in lateral GaAs single-electron quantum dots (Camenzind, Svab et al., arXiv:2010.11185 (2020)). | Session 54: Semiconductor Qubits |

1107 | Modeling resonant tuning of hole g-tensors and underlying mechanisms in quantum dot molecules | Lin, Arthur; Doty, Matthew; Bryant, Garnett | Here, we provide an atomistic tight-binding theory for this tuning of Zeeman splitting to elucidate the mechanism for this enhancement and to identify ways to further manipulate the hole g-tensor. | Session 54: Semiconductor Qubits |

1108 | Pulse shaping for a robust CZ gate in a silicon three-qubit device with always-on exchange | Kanaar, David; Wolin, Sidney; Güngördü, Utkan; Kestner, Jason | In this talk we will show how to make a CZ gate robust against charge noise, the most important noise in the silicon 3-qubit device. | Session 54: Semiconductor Qubits |

1109 | High Fidelity Spin Readout in a CMOS Device | Urdampilleta, Matias; Niegemann, David; chanrion, Emmanuel; jadot, Baptiste; spence, Cameron; mortemousque, Pierre-André; Bauerle, Christopher; Bertrand, Benoit; maurand, romain; jehl, xavier; sanquer, marc; De Franceschi, Silvano; Vinet, Maud; Meunier, Tristan | In this presentation, we will show how we can detect a single spin in a CMOS device thanks to an original approach which combines gate-based dispersive charge sensing and a latched Pauli spin blockade mechanism. | Session 54: Semiconductor Qubits |

1110 | Vanadium spin qubits as telecom quantum emitters in silicon carbide | Wolfowicz, Gary; Anderson, Christopher; Kovos, Berk; Poluektov, Oleg; Joseph, F.; Awschalom, David | Here we create and isolate single vanadium dopants in silicon carbide (SiC) with emission in the O-band (~1300 nm) and with brightness allowing cavity-free detection, in a wafer scale CMOS-compatible material [1]. | Session 55: Semiconductor Qubits – Novel Spin Qubit Materials and Technologies |

1111 | Kramers doublet transition metal point defects in hexagonal silicon carbide | Csóré, András; Gali, Adam | A complex interplay between the electronic orbitals, phonons and electron spin determines the effective pseudospin of the system that we demonstrate on vanadium and molybdenum defects in hexagonal SiC by means of ab initio calculations [1]. | Session 55: Semiconductor Qubits – Novel Spin Qubit Materials and Technologies |

1112 | Probing the coherence of solid-state qubits at avoided crossings | Onizhuk, Mykyta; Miao, Kevin; Blanton, Joseph; Ma, He; Anderson, Christopher; Bourassa, Alexandre; Awschalom, David; Galli, Giulia | We present a theoretical approach based on a generalization of the cluster expansion method. | Session 55: Semiconductor Qubits – Novel Spin Qubit Materials and Technologies |

1113 | Stabilization of a solid-state spin qubit in a decoherence-protected subspace | Blanton, Joseph; Miao, Kevin; Anderson, Christopher; Bourassa, Alexandre; Crook, Alexander; Wolfowicz, Gary; Abe, Hiroshi; Ohshima, Takeshi; Awschalom, David | This demonstration of the coherence measurement of an electron spin qubit in a DPS indicates that utilizing this technique could lead to similar improvements in other systems where long coherence times and fast control are needed. | Session 55: Semiconductor Qubits – Novel Spin Qubit Materials and Technologies |

1114 | Improved ensemble spin coherence of silicon vacancies using isotopically purified 4H-SiC | Carter, Samuel; Myers-Ward, Rachael; Pennachio, Daniel; Hajzus, Jenifer; Gaskill, David; Purdy, Andrew; Yeats, Andrew; Brereton, Peter; Glaser, Evan; Reinecke, Thomas | Here, we report on ensemble spin coherence measurements of the V2 V Si for isotopically purified 4H-SiC epilayers, with much lower concentrations of 29Si and 13C. | Session 55: Semiconductor Qubits – Novel Spin Qubit Materials and Technologies |

1115 | Single artificial atoms in silicon emitting at telecom wavelengths | Durand, Alrik; Redjem, Walid; Herzig, Tobias; Benali, Abdennacer; Pezzagna, Sebastien; Meijer, Jan; Kuznetsov, Andrej; Nguyen, Hai Son; Cueff, Sebastien; Gerard, Jean-Michel; Robert-Philip, Isabelle; Gil, Bernard; Caliste, Damien; Pochet, Pascal; Abbarchi, Marco; Jacques, Vincent; Dréau, Anaïs; Cassabois, Guillaume | In our recent work [1], we show the isolation of single optically-active point defects in a commercial silicon-on-insulator wafer implanted with carbon atoms. | Session 55: Semiconductor Qubits – Novel Spin Qubit Materials and Technologies |

1116 | Applications of a hole spin qubit with spin-orbit switch | Froning, Florian; van der Molen, Orson; Camenzind, Leon; Li, Ang; Bakkers, Erik; Zumbuhl, Dominik; Braakman, Floris | Here, we perform spectroscopy of a hole spin qubit in a Ge/Si nanowire and characterize the qubit parameters. | Session 55: Semiconductor Qubits – Novel Spin Qubit Materials and Technologies |

1117 | Suppression of the optical linewidth and spin decoherence of a quantum spin center in a p–n diode | Candido, Denis; Flatté, Michael | We present a quantitative theory of the suppression of the optical linewidth due to charge fluctuation noise in a p–n diode [1], recently observed in Ref. | Session 55: Semiconductor Qubits – Novel Spin Qubit Materials and Technologies |

1118 | Ultrafast hole spin qubit with spin-orbit switch | Froning, Florian; Camenzind, Leon; van der Molen, Orson; Li, Ang; Bakkers, Erik; Zumbuhl, Dominik; Braakman, Floris | Here [1], we demonstrate the basics of this qubit operation scheme and find the Rabi oscillation frequency as well as the g-factor to be highly tunable with small changes in gate voltages. | Session 55: Semiconductor Qubits – Novel Spin Qubit Materials and Technologies |

1119 | Universal coherence protection and electrical control of spins in silicon carbide | Miao, Kevin | We isolate single kh basal VVs in 4H-SiC, where we demonstrate inhomogeneous spin dephasing times approaching 200 µs and Hahn-echo coherence times >1 ms. We map the excited-state fine structure of the kh VV and find near-transform-limited optical coherence in both time and frequency domains. | Session 55: Semiconductor Qubits – Novel Spin Qubit Materials and Technologies |

1120 | Purcell enhancement of a silicon carbide color center with coherent spin control | Crook, Alexander; Anderson, Christopher; Miao, Kevin; Bourassa, Alexandre; Lee, Hope; Bayliss, Sam; Bracher, David; Zhang, Xingyu; Abe, Hiroshi; Ohshima, Takeshi; Hu, Evelyn; Awschalom, David | Here we present the Purcell enhancement and coherent spin control of a single divacancy coupled to a photonic crystal cavity [1]. | Session 55: Semiconductor Qubits – Novel Spin Qubit Materials and Technologies |

1121 | Coherent control and high-fidelity readout of chromium ions in commercial silicon carbide | Kovos, Berk; Whiteley, Samuel; Anderson, Christopher; Wolfowicz, Gary; Wesson, Marie; Bielejec, Edward; Joseph, F.; Awschalom, David | In this work [1], we study the formation of Cr 4+ in a commercial SiC substrate through implantation and annealing, enabling optical and coherent spin characterization. | Session 55: Semiconductor Qubits – Novel Spin Qubit Materials and Technologies |

1122 | Wafer-scale electrically tunable quantum nodes in silicon carbide | Anderson, Christopher; Bourassa, Alexandre; Miao, Kevin; Onizhuk, Mykyta; Ma, He; Wolfowicz, Gary; Crook, Alexander; Mintun, Peter; Abe, Hiroshi; Ul-Hassan, Jawad; Son, Nguyen; Ohshima, Takeshi; Galli, Giulia; Awschalom, David | Combined with the entanglement and control of nuclear spin registers, this work establishes a promising platform for quantum science. | Session 55: Semiconductor Qubits – Novel Spin Qubit Materials and Technologies |

1123 | The germanium quantum information route | Scappucci, Giordano | I will examine the materials science progress underpinning germanium-based planar heterostructures [2] and review the most significant experimental results demonstrating key building blocks for quantum technology [3,4], identifying the most promising avenues toward scalable quantum information processing in germanium-based systems. | Session 55: Semiconductor Qubits – Novel Spin Qubit Materials and Technologies |

1124 | A two-dimensional array of single-hole quantum dots | Van Riggelen, Floor; Hendrickx, Nico; Lawrie, William; Russ, Maximilian; Sammak, Amir; Scappucci, Giordano; Veldhorst, Menno | In this talk we will show result of experiments performed on such an array. | Session 55: Semiconductor Qubits – Novel Spin Qubit Materials and Technologies |

1125 | Spin coupling in a Ge-hole triple quantum dot | Kukucka, Josip; Saez-Mollejo, Jaime; Jirovec, Daniel; Crippa, Alessandro; Ballabio, Andrea; Tavani, Giulio; Chrastina, Danny; Isella, Giovanni; Martins, Frederico; Katsaros, Georgios | In this work, we explore other geometries and the possibility to implement spin coupling in a triple quantum dot array. | Session 55: Semiconductor Qubits – Novel Spin Qubit Materials and Technologies |

1126 | The Wiggle Well: An oscillatory concentration of germanium within a silicon quantum well | McJunkin, Thomas; Harpt, Benjamin; Feng, Yi; Wolfe, Michael; Savage, Donald; Lagally, Max; Coppersmith, Sue; Friesen, Mark; Joynt, Robert; Eriksson, Mark | Motivated by a desire to enhance the splitting between the two low-lying valley states in Si quantum dots for use as qubits, we present a new Si/SiGe heterostructure named the “Wiggle Well”. | Session 55: Semiconductor Qubits – Novel Spin Qubit Materials and Technologies |

1127 | Entanglement of dark electron-nuclear spin defects in diamond | Degen, Maarten; Loenen, Sjoerd; Bartling, Hans; Bradley, Conor; Meinsma, Aletta; Taminiau, Tim Hugo | Here we demonstrate the initialization, control and entanglement of individual P1 centers that are part of a spin bath surrounding a nitrogen-vacancy center in diamond. | Session 55: Semiconductor Qubits – Novel Spin Qubit Materials and Technologies |

1128 | Creation and control of spin defects in hexagonal boron nitride | Li, Tongcang | We have previously demonstrated stable emission and fast optical modulation of quantum emitters in boron nitride nanotubes [ Optics Letters, 43, 3778 (2018)]. | Session 55: Semiconductor Qubits – Novel Spin Qubit Materials and Technologies |

1129 | Towards a quantum register for single 171Yb:YVO ions embedded in a nanophotonic cavity | Ruskuc, Andrei; Kindem, Jonathan; Choi, Joonhee; Wu, Chun-Ju; Bartholomew, John; Rochman, Jake; Faraon, Andrei | [1] In this talk we explore the dynamics of a single 171Yb ion interacting with a small, local ensemble of vanadium lattice spins. | Session 55: Semiconductor Qubits – Novel Spin Qubit Materials and Technologies |

1130 | Erbium-Implanted Materials for Quantum Communication | Stevenson, Paul; Phenicie, Christopher; Welinski, Sacha; Gray, Isaiah; Horvath, Sebastian; Ferrenti, Austin; Cava, Robert; Lyon, Stephen; De Leon, Nathalie; Thompson, Jeff | Using ion-implantation, we introduce Er 3+ into a wide array of host materials in a surface-specific manner suited to nanophotonic integration. | Session 55: Semiconductor Qubits – Novel Spin Qubit Materials and Technologies |

1131 | Towards Coherent Control of the Tin Vacancy in Diamond | Debroux, Romain; Trusheim, Matthew; Gangloff, Dorian; Purser, Carola; Wan, Noel; De Santis, Lorenzo; Huber, Luca; Michaels, Cathryn; Arjona Martínez, Jesús; Parker, Ryan; Stramma, Alexander; Englund, Dirk; Atature, Mete | Here, we report ground-state spin lifetime and magnetic resonance measurements of the tin vacancy (SnV) centre in diamond at cryogenic temperatures. | Session 55: Semiconductor Qubits – Novel Spin Qubit Materials and Technologies |

1132 | Optical control design of single Si-V– and Sn-V– centers in diamond | Takou, Evangelia; Economou, Sophia | We test the robustness of our protocols through simulation for various temperatures and use quantum control techniques to mitigate the driving errors and reduce the gate time. | Session 55: Semiconductor Qubits – Novel Spin Qubit Materials and Technologies |

1133 | Rydberg excitations of the neutral Silicon Vacancy center in diamond for ODMR detection | Thiering, Gergô; Gali, Adam | Based on our recent theory 2,3, we employ plane-wave supercell calculations on SiV(0) by means of density functional theory to map the Rydberg-like bound exciton states above the zero phonon optical transition at around 1.41 eV. | Session 55: Semiconductor Qubits – Novel Spin Qubit Materials and Technologies |

1134 | Group IV color centers in single crystal diamond membrane for quantum network | Guo, Xinghan; Li, Zixi; Liu, Tianle; Delegan, Nazar; Jin, Yu; Awschalom, David; Galli, Giulia; Joseph, F.; High, Alexander | Using single crystal diamond membrane, we developed a versatile platform that enables strain tuning and nanophotonic integration. | Session 55: Semiconductor Qubits – Novel Spin Qubit Materials and Technologies |

1135 | Optically addressable molecular spin qubits | Bayliss, Sam; Laorenza, Daniel; Mintun, Peter; Kovos, Berk; Freedman, Danna; Awschalom, David | Chemically synthesized molecules provide an alternative bottom-up approach for optically addressable spin systems, offering an intrinsically tunable, scalable and host-agnostic architecture. | Session 55: Semiconductor Qubits – Novel Spin Qubit Materials and Technologies |

1136 | First-principles calculations of hyperfine interaction, binding energy, and quadrupole coupling for shallow donors | Swift, Michael; Peelaers, Hartwin; Mu, Sai; Van de Walle, Chris | We have developed a methodology that is capable of accurately predicting properties of shallow impurities. | Session 56: Semiconductor Qubits – Quantum Computing with Donor Spins |

1137 | Arrayed Quantum Dot Characterization in Si:P Quantum Devices | Fei, Fan; Wang, Xiqiao; Kashid, Ranjit; Wyrick, Jonathan; Namboodiri, Pradeep; Silver, Richard | We present the design and fabrication of double/arrayed quantum dot devices. | Session 56: Semiconductor Qubits – Quantum Computing with Donor Spins |

1138 | A chemical model for atomic-precision single-donor incorporation of phosphorus atoms in Si(100)-2×1 | Campbell, Quinn; Ivie, Jeffrey; Koepke, Justin; Brickson, Mitchell; Schultz, Peter; Muller, Richard; Bussmann, Ezra; Baczewski, Andrew; Mounce, Andrew; Misra, Shashank | In this talk, we develop a kinetic Monte Carlo model of this process parameterized from first principles calculations to predict the incorporation statistics as a function of the initial depassivation geometry, temperature at dosing and anneal, and pressure of precursor gas. | Session 56: Semiconductor Qubits – Quantum Computing with Donor Spins |

1139 | Transition metal impurities in Silicon: Computational search for semiconductor qubit | Lee, Cheng-Wei; Tamboli, Adele; Singh, Meenakshi; Stevanovic, Vladan | Specifically, we applied the well-established supercell approach and HSE06 hybrid functional, which accurately reproduces band gap of Si as well as localization of defect states. | Session 56: Semiconductor Qubits – Quantum Computing with Donor Spins |

1140 | Understanding charge-stability diagrams of dopant arrays in Si | Bryant, Garnett; Townsend, Emily; Ochoa, Maicol; Fei, Fan; Wang, Xiqiao; Silver, Richard | We describe theoretical simulations done for two-dimensional arrays of dopants in Si implemented with an extended range Fermi-Hubbard model and supported by atomistic modelling of the array states. | Session 56: Semiconductor Qubits – Quantum Computing with Donor Spins |

1141 | Tunneling Statistics and Spin Readout of Few-donor Quantum Dots in Silicon | Wang, Xiqiao; Kashid, Ranjit; Wyrick, Jonathan; Fei, Fan; Namboodiri, Pradeep; Rigosi, Albert; Silver, Richard | Here we present our recent spin readout and initialization measurements in few-donor cluster quantum dots using STM-patterned single-electron transistor charge sensors in the strong response regime. | Session 56: Semiconductor Qubits – Quantum Computing with Donor Spins |

1142 | Properties of shallow donor ensembles in ZnO for quantum memory applications | Niaouris, Vasileios; Zimmermann, Christian; Linpeng, Xiayu; Viitaniemi, Maria; Kozuka, Yusuke; Kawasaki, Masashi; Fu, Kai-Mei | Here we report on the optical ensemble properties of ZnO donors, toward quantum memory applications (QMA). | Session 56: Semiconductor Qubits – Quantum Computing with Donor Spins |

1143 | Atom-Based Silicon Devices for Quantum Computing and Analog Quantum Simulation | Silver, Richard; Wang, Xiqiao; Fei, Fan; Kashid, Ranjit; Namboodiri, Pradeep; Restelli, Alessandro; Wyrick, Jonathan; Rigosi, Albert; Bryant, Garnett | Using an extended Hubbard model we explore the impact of site-by-site disorder on charge occupation, the spatial distribution of the eigenstates, the Anderson Mott transition, and the Hubbard band structure. | Session 56: Semiconductor Qubits – Quantum Computing with Donor Spins |

1144 | The improved point-charge model for dopants in Si and applications to atomic-scale system simulations | Liu, Keyi; Rozanski, Piotr; Zielinski, Michal; Bryant, Garnett | We have developed a first principles-based dopant model with several new corrections that are obtained explicitly through self-consistent field calculations to evaluate the appropriate dopant matrix elements rather than by fitting to experiment. | Session 56: Semiconductor Qubits – Quantum Computing with Donor Spins |

1145 | The impact of donor incorporation statistics on analog quantum simulations of Hubbard physics in near-atomic precision donor arrays | Brickson, Mitchell; Campbell, Quinn; Ivie, Jeffrey; Koepke, Justin; Schultz, Peter; Muller, Richard; Bussmann, Ezra; Baczewski, Andrew; Misra, Shashank | Using our model, we find limits on the Hamiltonians one can target without losing prominent physical features of the model to missing donors. | Session 56: Semiconductor Qubits – Quantum Computing with Donor Spins |

1146 | Digital Hydrogen Depassivation Lithography for Improving Precison of Donor Placement in Si | Randall, John; Owen, James; Fuchs, Ehud; Santini, Robin | We describe a new digital exposure strategy that moves the tip in imaging mode to a position above a pixel then holds still while transitioning to lithography conditions and exposes all four H atoms in that pixel. | Session 56: Semiconductor Qubits – Quantum Computing with Donor Spins |

1147 | The electronic structure and transport properties of phosphorus arrays and phosphorus clusters in silicon nanodevices. | Ochoa, Maicol; Liu, Keyi; Townsend, Emily; Gawelczyk, Michal; Zielinski, Michal; Bryant, Garnett | We present theoretical atomistic calculations and a detailed analysis of the electronic and transport properties of phosphorus dopant arrays and clusters in Si quantum devices. | Session 56: Semiconductor Qubits – Quantum Computing with Donor Spins |

1148 | Dopant Precursor Adsorption into a Single-Dimer Window on Si(100): Computational Screening of Precursor-Resist Combinations | Radue, Matthew; Mo, Yifei; Butera, Robert | In this study, density functional theory is used to calculate the initial adsorption configurations and adsorption pathways of common acceptor and donor precursors into a single-dimer window. | Session 56: Semiconductor Qubits – Quantum Computing with Donor Spins |

1149 | A two-qubit gate between phosphorus donor electrons in silicon | Gorman, Samuel | Towards this end, we present recent results on the role of quantised nuclear spins on the exchange dynamics of atomic-scale devices. | Session 56: Semiconductor Qubits – Quantum Computing with Donor Spins |

1150 | Hardware-efficient error-correcting codes for large nuclear spins | Gross, Jonathan; Godfrin, Clément; Blais, Alexandre; Dupont-Ferrier, Eva | Here we present a protocol consisting of experimentally feasible operations that leverages the extended Hilbert space of a large nuclear spin to correct dephasing errors. | Session 56: Semiconductor Qubits – Quantum Computing with Donor Spins |

1151 | Rydberg Entangling Gates in Silicon | Crane, Eleanor; Schuckert, Alexander; Le, Nguyen; Fisher, Andrew | We propose a new Rydberg entangling gate scheme which we demonstrate theoretically to have an order of magnitude improvement in fidelities and speed over existing protocols. | Session 56: Semiconductor Qubits – Quantum Computing with Donor Spins |

1152 | The adsorption of AlCl3 and incorporation of Al on Si(100) for Atomic Precision Fabrication | Farzaneh, Azadeh; Baek, Sungha; Radue, Matthew; Dwyer, Kevin; Mo, Yifei; Butera, Robert | We investigated the adsorption of AlCl 3 on Si(100) with scanning tunneling microscopy (STM), X-ray photoelectron spectroscopy, and density functional theory calculations to reveal reaction pathways of Al atom incorporation in Si. | Session 56: Semiconductor Qubits – Quantum Computing with Donor Spins |

1153 | Characterizing electron temperature and a cryogenic printed circuit board for spin-based quantum computing in Silicon | Kashid, Ranjit; Namboodiri, Pradeep; Restelli, Alessandro; Wang, Xiqiao; Wyrick, Jonathan; Fei, Fan; Zimmerman, Neil; Silver, Richard | To satisfy these operational frequency and low electron temperature requirements, we have developed a 6-layer cryogenic high frequency printed circuit board (PCB) with onboard filtering. | Session 56: Semiconductor Qubits – Quantum Computing with Donor Spins |

1154 | Decoherence of Dipole Coupled Flip-Flop Qubits | Truong, John; Hu, Xuedong | Here we study this effective coupling, especially the effect of charge noise on two-qubit gates utilizing this coupling. | Session 56: Semiconductor Qubits – Quantum Computing with Donor Spins |

1155 | Magnetotransport Characterization of Atomic-scale B-doped δ-layer devices in Si | Baek, Sungha; Farzaneh, Azadeh; Dwyer, Kevin; Williams, James; Butera, Robert | Here, we demonstrate the fabrication of atomic-scale, B-doped δ-layer devices in Si through area selective deposition of BCl 3 on Si(100) and measure the magnetotransport properties of resulting Hall bar devices. | Session 56: Semiconductor Qubits – Quantum Computing with Donor Spins |

1156 | Area-selective deposition of BCl3 on Si(100) for B-doped δ-layer device fabrication | Dwyer, Kevin; Farzaneh, Azadeh; Baek, Sungha; Dreyer, Michael; Butera, Robert | We present results on the adsorption and incorporation of B from area-selective deposition of BCl 3 onto the Si(100) surface. | Session 56: Semiconductor Qubits – Quantum Computing with Donor Spins |

1157 | Stochastic atomistic disorder in atomic-precision doping | Koepke, Justin; Ivie, Jeffrey; Campbell, Quinn; Brickson, Mitchell; Schultz, Peter; Muller, Richard; Baczewski, Andrew; Mounce, Andrew; Bussmann, Ezra; Misra, Shashank | We will explain how the results pose a significant challenge for engineering future quantum simulators and circuits. | Session 56: Semiconductor Qubits – Quantum Computing with Donor Spins |

1158 | Dynamical decoupling of P1 centers in diamond | Williams, Ethan; Ramanathan, Chandrasekhar | We explore the use of pulsed dynamical decoupling sequences to control the coherence times of P1 centers in diamond as a function of the P1 concentration. | Session 56: Semiconductor Qubits – Quantum Computing with Donor Spins |

1159 | Three Dimensional Control of Monolothic Atomic-Scale Devices in Silicon | Donnelly, Matthew; Keizer, Joris; Thorgrimsson, Brandur; Simmons, Michelle | Building on work that has demonstrated the viability of using vertically separated gates in 3D monolithic phosphorus-doped-silicon (Si:P) devices to couple to single electron transistors [1] and nanowires [2], we will show how reducing the footprint of these epitaxial gates coupled with a novel alignment procedure can be used to finely tune the electrostatic potential in donor atom devices. | Session 56: Semiconductor Qubits – Quantum Computing with Donor Spins |

1160 | Comparing effective mass models of the phoshorus donor in silicon | Pendo, Luke; Hu, Xuedong | In this talk, we examine models of the donor atom’s Coulomb potential considering the effects of a dielectric constant with dynamic response. | Session 56: Semiconductor Qubits – Quantum Computing with Donor Spins |

1161 | Low charge noise in atom qubits in silicon | Kranz, Ludwik; Gorman, Samuel; Thorgrimsson, Brandur; He, Yu; Keith, Daniel; Keizer, Joris; Simmons, Michelle | Here, we show a significantly reduced magnitude of charge noise in all-epitaxial, precision placed phosphorus atom-based platform, in which the qubits are naturally separated from surfaces and interface states. | Session 56: Semiconductor Qubits – Quantum Computing with Donor Spins |

1162 | Reflectometry of charge transitions in a silicon quadruple dot | Bohuslavskyi, Heorhii; Ansaloni, Fabio; Chatterjee, Anasua; Fedele, Federico; Rasmussen, Torbjørn; Brovang, Bertram; LI, Jing; HUTIN, Louis; Venitucci, Benjamin; Bertrand, Benoit; Vinet, Maud; Niquet, Yann-Michel; Kuemmeth, Ferdinand | We perform gate-based reflectometry measurements of various charge states in a foundry-fabricated two-dimensional quadruple quantum dot. | Session 57: Semiconductor Qubits – Spin Qubit Read-out |

1163 | Spin Readout of a CMOS Quantum Dot by Gate Reflectometry and Spin-Dependent Tunneling | Ciriano-Tejel, Virginia; Fogarty, Michael; Schaal, Simon; HUTIN, Louis; Bertrand, Benoit; Ibberson, Lisa; Gonzalez-Zalba, M Fernando; LI, Jing; Niquet, Yann-Michel; Vinet, Maud; Morton, John | We report the measurement of the electron spin orientation in a singly-occupied gate-defined quantum dot, fabricated using CMOS compatible processes at the 300 mm wafer-scale [1]. | Session 57: Semiconductor Qubits – Spin Qubit Read-out |

1164 | Permutation of two electrons within a two-dimensional array of quantum dot | Ansaloni, Fabio; Chatterjee, Anasua; Bohuslavskyi, Heorhii; Bertrand, Benoit; HUTIN, Louis; Vinet, Maud; Kuemmeth, Ferdinand | In this talk I will present our recent results on the control of a foundry-fabricated 2×2 array of silicon quantum dots in the few-electron regime, achieving single-electron occupation in each of the four gate-defined dots [3]. | Session 57: Semiconductor Qubits – Spin Qubit Read-out |

1165 | Bell-state tomography in a silicon many-electron artificial molecule | Leon, Ross; Yang, Chih Hwan; Hwang, Jason; Camirand Lemyre, Julien; Tanttu, Tuomo; Huang, Wei; Huang, Jonathan; Itoh, Kohei; Laucht, Arne; Pioro-Ladriere, Michel; Saraiva, Andre; Dzurak, Andrew | Here we investigate two spin qubits confined in a silicon double quantum-dot artificial molecule. | Session 57: Semiconductor Qubits – Spin Qubit Read-out |

1166 | Large Dispersive Interaction between a CMOS Double Quantum Dot and Microwave Photons | Ibberson, David; Lundberg, Theodor; Haigh, James; HUTIN, Louis; Bertrand, Benoit; Barraud, Sylvain; Lee, Chang-Min; Stelmashenko, Nadia; Robinson, Jason; Vinet, Maud; Gonzalez-Zalba, M Fernando; Ibberson, Lisa | With that goal in mind, here we demonstrate the readout of an inter-dot charge transition, the basis of parity readout, in 50 ns with a SNR of 3.3. | Session 57: Semiconductor Qubits – Spin Qubit Read-out |

1167 | Accurate spin and valley state identification in silicon double quantum dots | Lundberg, Theodor; Ibberson, David; LI, Jing; HUTIN, Louis; Bertrand, Benoit; Lee, Chang-Min; Niegemann, David; Urdampilleta, Matias; Stelmashenko, Nadia; Meunier, Tristan; Robinson, Jason; Vinet, Maud; Ibberson, Lisa; Niquet, Yann-Michel; Gonzalez-Zalba, M Fernando | Here, we expand the standard description of Pauli spin blockade in a double quantum dots (DQD) to include multiparticle states with large total spin angular momentum S. Using gate-based dispersive readout and magnetospectroscopy, we show successive steps of spin blockade and spin-blockade lifting involving spin states up to S=3 as well as the formation of a novel spin-quintet state [2]. | Session 57: Semiconductor Qubits – Spin Qubit Read-out |

1168 | Multi-qubit and multi-dot reflectometry measurements in arrays of semiconductor quantum dots | Kuemmeth, Ferdinand | To mitigate this challenge, we developed sparse acquisition methods in which the boundaries of Coulomb-blockade polytopes are reconstructed from a discrete set of time stamps, each triggered by a simple thresholding circuit that detects abrupt changes in the reflectometry signal without ever digitizing it. | Session 57: Semiconductor Qubits – Spin Qubit Read-out |

1169 | Low Temperature Radiofrequency Reflectometry setup for Charge sensing in CMOS devices | Rivard, Joffrey; Godfrin, Clément; Orlov, Alexei; Dupont-Ferrier, Eva | In this talk, we report a charge-sensing measurement of a CMOS device with optimized reflectometry setup and discuss the use of tunable capacitors to target high sensitivity RF-measurement for spin qubit readout. | Session 57: Semiconductor Qubits – Spin Qubit Read-out |

1170 | Low-frequency electron spin-qubit detuning noise in highly purified 28Si/SiGe* | Struck, Tom; Hollmann, Arne; Schauer, Floyd; Schmidbauer, Andreas; Langrock, Veit; Fedorets, Olexiy; Sawano, Kentarou; Riemann, Helge; Abrosimov, Nikolay; Cywinski, Lukasz; Bougeard, Dominique; Schreiber, Lars | Here, we characterize a 28Si/SiGe device with an embedded nanomagnet, a large valley splitting (> 0.2 meV [2]), and a remaining 29Si concentration of only 60 ppm in the strained silicon quantum well layer, which is grown by molecular beam epitaxy. | Session 57: Semiconductor Qubits – Spin Qubit Read-out |

1171 | A reset-if-leaked procedure for encoded spin qubits | Langrock, Veit; DiVincenzo, David | We show, based on group-theoretic reasoning, that 2 ancillary spins are sufficient to perform such leakage reduction and present sequence accomplishing this task within 14 exchange gates, less than half than previously reported [2]. | Session 57: Semiconductor Qubits – Spin Qubit Read-out |

1172 | Non-Markovian qubit spectroscopy in cavity QED | McIntyre, Zoe; Coish, Bill | In this talk, we present a way of extracting the coherence dynamics of a qubit coupled to a cavity purely from frequency-dependent measurements of the cavity response in cavity quantum electrodynamics (QED). | Session 57: Semiconductor Qubits – Spin Qubit Read-out |

1173 | Asymmetric Sensing Dot for Scaleable Baseband Readout of Spin Qubits | Kammerloher, Eugen; Kuenne, Matthias; Seidler, Inga; Ludwig, Arne; Wieck, Andreas; Schreiber, Lars; Bluhm, Hendrik | We present experimental results in GaAs of an asymmetric sensing dot (ASD), improving the sensor response by a factor of 13, compared to conventional charge sensing dots. | Session 57: Semiconductor Qubits – Spin Qubit Read-out |

1174 | State preparation fidelity by QND readout of a silicon electron spin qubit | Yoneda, Jun; Kobayashi, Takashi; Takeda, Kenta; Noiri, Akito; Nakajima, Takashi; Li, Sen; Kamioka, Jun; Kodera, Tetsuo; Tarucha, Seigo | Here we discuss the state preparation fidelity of a cumulative QND readout of an electron spin qubit in a silicon quantum dot with its neighboring electron spin used as an ancilla [1]. | Session 57: Semiconductor Qubits – Spin Qubit Read-out |

1175 | Microsecond single-spin readout in semiconductors in the “strong-response” regime | Keith, Daniel; House, Matthew; Donnelly, Matthew; Watson, Thomas; Weber, Bent; Simmons, Michelle | We present a theory of the shot-noise sensitivity limit for the strong-response regime which predicts that the present sensitivity is about one order of magnitude above the shot-noise limit. | Session 57: Semiconductor Qubits – Spin Qubit Read-out |

1176 | Remote Capacitive Sensing in Two-Dimensional Quantum-Dot Arrays | Duan, Jingyu; Fogarty, Michael; Williams, James; HUTIN, Louis; Vinet, Maud; Morton, John | We present the capacitive coupling of quantum dots within such a 2 × 2 array and then show how such couplings can be extended across two parallel silicon nanowires coupled together by shared, electrically isolated, “floating” electrodes. | Session 57: Semiconductor Qubits – Spin Qubit Read-out |

1177 | Adiabatic conversion for qubit readout: Optimal pulse shapes and dephasing | Fehse, Felix; Pioro-Ladriere, Michel; Coish, Bill | We give an explicit construction that allows for optimal state conversion in qubit readouts. | Session 57: Semiconductor Qubits – Spin Qubit Read-out |

1178 | Automatic, adaptive and sparse acquisition of Coulomb-blockade boundaries in quantum-dot arrays (Part 2) | Brovang, Bertram; Rasmussen, Torbjørn; Chatterjee, Anasua; Krause, Oswin; Kuemmeth, Ferdinand | To learn Coulomb-blockade boundaries from only a sparse set of measurements, we develop a convex-polytope-finding algorithm based on active learning and large-margin classifiers suitable for noisy measurements. | Session 57: Semiconductor Qubits – Spin Qubit Read-out |

1179 | Parametric Amplification in a CMOS Quantum Dot coupled to a Microwave Cavity | Cochrane, Laurence; Lundberg, Theodor; Ibberson, David; Ibberson, Lisa; HUTIN, Louis; Vinet, Maud; Seshia, Ashwin; Gonzalez-Zalba, M Fernando | We analyse through a semi-classical model and demonstrate experimentally parametric amplification using the tuneable tunnelling capacitance of a QD-reservoir electron transition in a CMOS nanowire split-gate transistor embedded in a 1.8 GHz superconducting spiral inductor microwave cavity. | Session 57: Semiconductor Qubits – Spin Qubit Read-out |

1180 | Sub-GHz Josephson parametric amplifiers for the readout of sensors and quantum dots | Vesterinen, Visa; Simbierowicz, Slawomir; Najafi Jabdaraghi, Robab; Grönberg, Leif; Lehtinen, Janne; Prunnila, Mika; Govenius, Joonas | We present our latest experimental results on sub-GHz Josephson parametric amplifiers (JPAs) fabricated with our Nb/Al-AlO x/Nb junction process [1]. | Session 57: Semiconductor Qubits – Spin Qubit Read-out |

1181 | Nuclear spin readout in a cavity-coupled silicon double quantum dot | Mielke, Jonas; Petta, Jason; Burkard, Guido | Here, we present a method for nuclear spin readout by probing the transmission of a microwave resonator. | Session 57: Semiconductor Qubits – Spin Qubit Read-out |

1182 | Quantum simulations of many-body physics using nuclear-spin qubits in diamond | Randall, Joe; Bradley, Conor; van der Gronden, Floris; Abobeih, Mohamed; Taminiau, Tim Hugo | Recently, we demonstrated the 3D imaging of a cluster of 27 coupled nuclear spins using a nitrogen vacancy (NV) centre in diamond [1], as well as a fully connected 10-qubit register formed of 9 nuclear spins combined with the NV centre electron spin [2]. | Session 57: Semiconductor Qubits – Spin Qubit Read-out |

1183 | Quantum information processing with high-density diamond nitrogen-vacancy centers in strain and magnetic fields. | Xu, Zhujing; Yin, Zhang-Qi; Han, Qinkai; Li, Tongcang | Here we propose methods to use closely spaced diamond nitrogen-vacancy (NV) centers for realizing quantum information processing and quantum computing. | Session 57: Semiconductor Qubits – Spin Qubit Read-out |

1184 | Entanglement between two intrinsically coherence-protected spin qubits | Bartling, Hans; Abobeih, Mohamed; Pingault, Benjamin; Degen, Maarten; Loenen, Sjoerd; Bradley, Conor; Randall, Joe; Taminiau, Tim Hugo | Here we introduce a new type of long-lived quantum system: a pair consisting of two identical coupled nuclear spins. | Session 57: Semiconductor Qubits – Spin Qubit Read-out |

1185 | Inductive detection and amplification of spin echoes using a superconducting parametric amplifier | Vine, Wyatt; Savytskyi, Mykhailo; Parker, Daniel; Johnson, Brett; McCallum, Jeffrey; Morello, Andrea; Pla, Jarryd | Here we report the use of a degenerate parametric amplifier (DPA) to perform in-situ amplification of spin echo signals in pulsed ESR measurements of 209Bi donors in Silicon. | Session 57: Semiconductor Qubits – Spin Qubit Read-out |

1186 | Automatic, adaptive and sparse acquisition of Coulomb-blockade boundaries in quantum-dot arrays (Part 1) | Chatterjee, Anasua; Ansaloni, Fabio; Brovang, Bertram; Rasmussen, Torbjørn; Krause, Oswin; Kuemmeth, Ferdinand | Instead, we develop a hardware-triggered detection method using high-frequency reflectometry, to acquire sparse measurements directly corresponding to transitions between competing ground states within the array. | Session 57: Semiconductor Qubits – Spin Qubit Read-out |

1187 | Robust photon-mediated entangling gates between single-electron quantum dots | Warren, Ada; Güngördü, Utkan; Kestner, Jason; Barnes, Edwin; Economou, Sophia | We present here a novel, photon-mediated cross-resonance gate which requires no resonant tuning, as well as a nested entangling gate sequence capable of suppressing gate errors due to quasistatic charge noise. | Session 57: Semiconductor Qubits – Spin Qubit Read-out |

1188 | Charge noise and overdrive effects in dispersive readout of charge and spin qubits | Derakhshan Maman, Vahid; Gonzalez-Zalba, Fernando; Palyi, Andras | In this theory talk, I will describe physical mechanisms that render such reflectometry-based readout schemes imperfect, focusing on semiconductor charge qubits and singlet-triplet spin qubits. | Session 58: Semiconductor Qubits: Spin Qubit Read-out |

1189 | Scaling up semiconductor spin qubits | Vandersypen, Lieven | In this talk, I will present our vision of a large-scale spin-based quantum processor, and ongoing work to realize this vision. | Session 58: Semiconductor Qubits: Spin Qubit Read-out |

1190 | High-performance exchange-only qubits in the SLEDGE architecture | Blumoff, Jacob | To facilitate improved control of the underlying electrostatic potential and scaling to larger arrays, we present a more advanced design called Single-Layer Etch-Defined Gate Electrode, or “SLEDGE.” | Session 58: Semiconductor Qubits: Spin Qubit Read-out |

1191 | Quantum non-demolition spin measurement in quantum dots | Yoneda, Jun | We will discuss how the high non-demolition fidelity is realized to allow for readout repetitions of a single spin state and how consecutive QND readout outcomes can be collectively used to maximize the measurement and preparation fidelities, with the main focus on the Si electron spin qubit case [3]. | Session 58: Semiconductor Qubits: Spin Qubit Read-out |

1192 | Bolometer operating at the threshold for circuit quantum electrodynamics | Kokkoniemi, Roope; Girard, Jean-Philippe; Hazra, Dibyendu; Laitinen, Antti; Govenius, Joonas; Lake, Russell; Sallinen, Iiro; Vesterinen, Visa; Partanen, Matti; Tan, J.; Chan, Kok Wai; Tan, Kuan; Hakonen, Pertti; Möttönen, Mikko | To address this issue, we experimentally demonstrate an ultrafast bolometer based on a graphene Josephson junction and operating at the threshold of circuit quantum electrodynamics [1]. | Session 59: Spin Qubit Readout and Amplifiers |

1193 | Improving the Quantum Efficiency of Josephson Traveling Wave Parametric Amplifiers | Peng, Kaidong; Naghiloo, Mahdi; Wang, Jennifer; Ye, Yufeng; O’Brien, Kevin | Here, we systematically analyze the quantum efficiency of a standard resonantly phase-matched JTWPA using a multi-mode input-output theory framework. | Session 59: Spin Qubit Readout and Amplifiers |

1194 | Power-efficient 3-wave mixing Josephson parametric amplifier | Dai, Wei; Sivak, Volodymyr; Liu, Gangqiang; Shankar, Shyam; Devoret, Michel | Compared to similar JPAs with a capacitively coupled pump port or mutual-inductively coupled flux-pumping, this technique improves power efficiency by at least an order of magnitude without lowering dynamic range and noise performance. | Session 59: Spin Qubit Readout and Amplifiers |

1195 | The kinetic inductance traveling-wave amplifier: an alternative to high electron mobility transistors | Malnou, Maxime; vissers, michael; Wheeler, Jordan; Aumentado, Jose; Hubmayr, Johannes; Ullom, Joel; Gao, Jiansong | We propose to use kinetic inductance traveling-wave amplifiers (KITs) at 4K as an alternative to HEMTs. | Session 59: Spin Qubit Readout and Amplifiers |

1196 | Niobium-based lumped element SNAIL parametric amplifiers with improved power handling capacity | Joshi, Vidul; Liu, Gangqiang; Malnou, Maxime; Sivak, Volodymyr; Frattini, Nicholas; Hilton, Gene; Vale, Leila; Ullom, Joel; Devoret, Michel | In this talk, we present SPAs with lumped element resonators fabricated by niobium tri-layer technology. | Session 59: Spin Qubit Readout and Amplifiers |

1197 | Full control of Josephson nonlinear processes in a Gradiometric SNAIL Parametric Amplifier | Miano, Alessandro; Liu, Gangqiang; Sivak, Volodymyr; Frunzio, Luigi; Joshi, Vidul; Dai, Wei; Frattini, Nicholas; Devoret, Michel | In this work, we present experimental results on the Gradiometric SNAIL Parametric Amplifier (GSPA), a device biased by two independent on-chip magnetic fluxes that allow to independently tune even and odd Josephson nonlinearities. | Session 59: Spin Qubit Readout and Amplifiers |

1198 | Minimal construction of fully directional parametric amplifier | Liu, Gangqiang; Josh, Vidul; Lingenfelter, Andrew; Frattini, Nicholas; Shankar, Shyam; Devoret, Michel | In this talk, we present a new design for a fully directional parametric amplifier whose input and output ports are matched, and whose reverse transmission is much smaller than the inverse of the forward gain. | Session 59: Spin Qubit Readout and Amplifiers |

1199 | Efficient and low-backaction quantum measurement using a chip-scale detector | Rosenthal, Eric; Schneider, Christian M. F.; Malnou, Maxime; Zhao, Ziyi; Leditzky, Felix; Chapman, Benjamin; Wustmann, Waltraut; Ma, Xizheng; Palken, Daniel; Zanner, Maximilian; Vale, Leila; Hilton, Gene; Gao, Jiansong; Smith, Graeme; Kirchmair, Gerhard; Lehnert, Konrad | Here, we demonstrate a solution to this problem by using a superconducting switch to control the coupling between a qubit and amplifier. | Session 59: Spin Qubit Readout and Amplifiers |

1200 | Rapid gate-based readout of spins in silicon using an on-chip resonator | Zheng, Guoji; Samkharadze, Nodar; Harvey-Collard, Patrick; Dijkema, Jurgen; Noordam, Marc; Kalhor, Nima; Brousse, Delphine; Sammak, Amir; Scappucci, Giordano; Vandersypen, Lieven | In this talk, we describe the use of an on-chip superconducting microwave resonator instead to improve the sensitivity, aided by its high quality factor and high impedance. | Session 59: Spin Qubit Readout and Amplifiers |

1201 | A Quantum measurement induced ground-state transition | Ferguson, Michael; Camenzind, Leon; Müller, Clemens; Biesinger, Daniel; Scheller, Christian; Braunecker, Bernd; Zumbuhl, Dominik; Zilberberg, Oded | We have developed a model that quantitatively accounts for the experiment. | Session 59: Spin Qubit Readout and Amplifiers |

1202 | Detecting spins with a microwave photon counter | Albertinale, Emanuele; Balembois, Léo; Billaud, Eric; Ranjan, Vishal; Flanigan, Daniel; Schenkel, Thomas; Esteve, Daniel; Vion, Denis; Bertet, Patrice; Flurin, Emmanuel | We report the direct observation of the microwave photons emitted by the spins, during their energy relaxation following a pi pulse. | Session 59: Spin Qubit Readout and Amplifiers |

1203 | Fast RF-only tuneup of quantum dot systems using multiplexed GHz CPW resonators | Prosko, Christian; De Jong, Damaz; Waardenburg, Daan; Han, Lin; Malinowski, Filip; Blaznik, Nejc; Krogstrup, Peter; Koski, Jonne; Kouwenhoven, Leo; Pfaff, Wolfgang | We implement a combination of capacitively and galvanically coupled Co-Planar Waveguide (CPW) resonators in a multi-quantum-dot InAs nanowire device and characterize it without the aid of DC measurement. | Session 59: Spin Qubit Readout and Amplifiers |

1204 | Accurate theory for drive-activated nonlinear processes in the SNAIL parametric amplifier | Petrescu, Alexandru; Royer, Baptiste; Blais, Alexandre | In this talk, we present a perturbative approach aimed at analytically characterizing unwanted interactions and predicting parameter regimes in which their effect is minimized, and apply it to a specific degenerate parametric amplifier. | Session 59: Spin Qubit Readout and Amplifiers |

1205 | Fast Initialization Experiment of Superconducting Qubit Using SINIS | Yoshioka, Teruaki; Nakamura, Shuji; Kaneko, Nobu-Hisa; Tsai, Jaw | In this presentation, we report the experimental results and fabrication of the device. | Session 60: Superconducting Qubit Gates, Measurement and Characterization |

1206 | Two-qubit tomography in the presence of stray couplings | Roy, Tanay; Li, Ziqian; Kapit, Eliot; Schuster, David | We have developed a protocol that can correct for these errors by computing the evolution of the system in software and is able to correctly determine the quantum state. | Session 60: Superconducting Qubit Gates, Measurement and Characterization |

1207 | Experimental implementation of non-Clifford interleaved randomized benchmarking with a controlled-S gate | Garion, Shelly; Kanazawa, Naoki; Landa, Haggai; McKay, David; Sheldon, Sarah; Cross, Andrew; Wood, Christopher | To that goal, here we demonstrate calibration of a high fidelity CS gate on an IBM cloud device. | Session 60: Superconducting Qubit Gates, Measurement and Characterization |

1208 | Mitigating back-action in parametric quantum amplifiers | Metelmann, Anja; Kamal, Archana | The nonlinear nature of the mixing process leads to back-action, limiting the dynamical range of the amplifier.Here we present possible ways to face these challenges, and how to avoid unwanted back-action effects in engineered quantum systems. | Session 60: Superconducting Qubit Gates, Measurement and Characterization |

1209 | Multipexed Photon Number Measurement | Essig, Antoine; Ficheux, Quentin; Sarlette, Alain; Rouchon, Pierre; Bienfait, Audrey; Huard, Benjamin | In this talk, I will report on our progress on performing this measurement in a single shot manner using state-of-the-art microwave engineering techniques. | Session 60: Superconducting Qubit Gates, Measurement and Characterization |

1210 | Efficient tomography of microwave photonic cluster states | Sunada, Yoshiki; Kono, Shingo; Ilves, Jesper; Sugiyama, Takanori; Suzuki, Yasunari; Okubo, Tsuyoshi; Nakamura, Yasunobu | Here, we propose and experimentally demonstrate an efficient procedure for estimating the density matrix of a sequentially generated string of photons. | Session 60: Superconducting Qubit Gates, Measurement and Characterization |

1211 | Stabilization of squeezing beyond 3 dB in a microwave resonator by reservoir engineering. | Dassonneville, Rémy; Assouly, Réouven; Peronnin, Théau; Clerk, Aashish; Bienfait, Audrey; Huard, Benjamin | In this work, we use two parametric pumps and a dump mode to engineer an effective coupling to an artificial squeezed reservoir. | Session 60: Superconducting Qubit Gates, Measurement and Characterization |

1212 | Influence of a strong pump field on controls of superconducting quantum parametrons | Masuda, Shumpei; Ishikawa, Toyofumi; Matsuzaki, Yuichiro; Kawabata, Shiro | We report the influence of unwanted rapidly oscillating terms in the Hamiltonian called counter rotating terms (CRTs) on the accuracy of controls of a parametron: a cat-state creation and a single-qubit gate. | Session 60: Superconducting Qubit Gates, Measurement and Characterization |

1213 | Vacuum-induced multipartite entanglement in superconducting microwave cavity under multiple pump tones | Perelshtein, Michael; Lilja, Ilari; Petrovnin, Kirill; Korkalainen, Terro; Paraoanu, Gheorghe; Hakonen, Pertti | In this work, we experimentally investigate vacuum correlations in a flux-tunable superconducting cavity under multiple pump tones. | Session 60: Superconducting Qubit Gates, Measurement and Characterization |

1214 | Flux-driven impedance-matched Josephson parametric amplifier with improved pump efficiency | Urade, Yoshiro; Zuo, Kun; Baba, Syotaro; Chang, C. W. Sandbo; Nittoh, Koh-ichi; Inomata, Kunihiro; Lin, Zhirong; Yamamoto, Tsuyoshi; Nakamura, Yasunobu | In this presentation, we experimentally demonstrate highly improved pump efficiency of flux-driven IMPAs by adding two features to their pump structures: (i) kinetic-inductance coupling between the SQUID in the amplifiers and pump waveguide [1] and (ii) a low-Q resonator to store pump photons and enhance the parametric process. | Session 60: Superconducting Qubit Gates, Measurement and Characterization |

1215 | Theory of deterministic three-photon down-conversion in ultrastrong cavity QED | Koshino, Kazuki; Semba, Kouichi | In this study, we theoretically analyze the optical response of an ultrastrong cavity QED system in which an atom is coupled to the fundamental and third harmonic modes of a cavity, and report the possibility of deterministic three-photon down-conversion, in which a single parent photon is converted into triplet photons by reflection from the cavity. | Session 60: Superconducting Qubit Gates, Measurement and Characterization |

1216 | Implementation of continuous multi-qubit gate families on superconducting quantum processors | Hill, Alexander; Didier, Nicolas | We present our latest results for each of these gate families on our current class of superconducting quantum processors, and additionally construct arbitrary fermionic simulation (fSIM) gates and the three qubit controlled-controlled phase (CCPHASE) gates. | Session 60: Superconducting Qubit Gates, Measurement and Characterization |

1217 | Parametric-resonance entangling gates for superconducting qubits | Sete, Eyob; Didier, Nicolas; Chen, Angela; Kulshreshtha, Shobhan; Manenti, Riccardo; Poletto, Stefano | We demonstrate experimentally parametric resonance iSWAP and controlled-Z entangling gates via radio-frequency flux modulation of one of the qubits. | Session 60: Superconducting Qubit Gates, Measurement and Characterization |

1218 | Realization of High-fidelity CZ and ZZ-free iSWAP Gates with a Tunable Coupler | Sung, Youngkyu; Ding, Leon; Braumüller, Jochen; Vepsäläinen, Antti; Kannan, Bharath; Kjaergaard, Morten; Greene, Amy; Samach, Gabriel; McNally, Chris; Kim, David; Melville, Alexander; Niedzielski, Bethany; Schwartz, Mollie; Yoder, Jonilyn; Orlando, Terry; Gustavsson, Simon; Oliver, William | Here, we present a systematic approach that goes beyond the dispersive approximation to exploit the engineered level structure of the coupler and optimize its control. | Session 60: Superconducting Qubit Gates, Measurement and Characterization |

1219 | Ultimate quantum limit for amplification: a single atom in front of a mirror | Wiegand, Emely; Frisk Kockum, Anton; Wen, Ping Yi; Hoi, IoChun | We investigate three types of amplification processes for light fields coupling to an atom near the end of a one-dimensional semi-infinite waveguide. | Session 60: Superconducting Qubit Gates, Measurement and Characterization |

1220 | Protected Qubit Subspace within a Fluxonium Molecule | Croot, Xanthe; You, Xinyuan; Premkumar, Anjali; Koch, Jens; Houck, Andrew | We present preliminary work towards realizing this protected qubit and detail its theoretical framework. | Session 61: Superconducting Qubit Systems |

1221 | Fast flux gates in inductively coupled fluxonium qubits | Zhang, Helin; Chakram, Srivatsan; Roy, Tanay; Ding, Chunyang; Baker, Brian; Weiss, Daniel; Huang, Ziwen; Koch, Jens; Schuster, David | In order to achieve high-fidelity initialization and readout, we demonstrate protocols utilizing higher levels beyond the computational subspace. | Session 61: Superconducting Qubit Systems |

1222 | Combining CSFQ and transmon qubits to suppress unwanted ZZ interaction | Ku, Jaseung | In this talk, we present the first such hybrid two-qubit device with a capacitively shunted flux qubit (CSFQ) and a transmon. | Session 61: Superconducting Qubit Systems |

1223 | A superconducting metamaterial quantum processor for studying quantum many-body physics: Part 1 | Zhang, Xueyue; Kim, Eun Jong; Painter, Oskar | In this talk, we discuss the realization of a resource-efficient quantum processor based on a superconducting metamaterial waveguide. | Session 61: Superconducting Qubit Systems |

1224 | A superconducting metamaterial quantum processor for studying quantum many-body physics: Part 2 | Kim, Eun Jong; Zhang, Xueyue; Painter, Oskar | In this talk, we report the progress towards the study of quantum many-body physics in a superconducting metamaterial quantum processor. | Session 61: Superconducting Qubit Systems |

1225 | Suppressed crosstalk between two-junction superconducting qubits with mode-selective coupling. | Finck, Aaron; Carnevale, Santino; Klaus, Dave; Scerbo, Christopher; Blair, John; McConkey, Thomas; Kurter, Cihan; Carniol, April; Keefe, George; Kumph, Muir; Dial, Oliver | Here, we describe a superconducting architecture using qubits that comprise of two capacitively-shunted Josephson junctions connected in series. | Session 61: Superconducting Qubit Systems |

1226 | ZZ freedom in two qubit gates | Xu, Xuexin; Ansari, Mohammad | Here we present that in general there are two theoretical ways for eliminating fundamental ZZ error: 1) static ZZ freedom by combining qubits with opposite sign anharmonicity 2) dynamic ZZ freedom in driven qubits with a microwave pulse, which can be universally realized by combining qubits with any anharmonicity signs. | Session 61: Superconducting Qubit Systems |

1227 | Relaxation of a transmon qubit from unconfined states and resurgence of coherence | Majumder, Sourav; Bera, Tanmoy; Suresh, Ramya; Singh, Vibhor | Motivated from this aspect, we investigate the relaxation of a transmon qubit after driving it to unconfined states with large power. | Session 61: Superconducting Qubit Systems |

1228 | Study of a two-state fluctuation in a ultra-strongly coupled qubit-resonator system | Tomonaga, Akiyoshi; Mukai, Hiroto; Tsai, Jaw-Shen | Rabi model Hamiltonian well known as the representation of the qubit-resonator coupling system, but the spectrum will be reported in this talk has doubly split structure that cannot be described by the Rabi model. | Session 61: Superconducting Qubit Systems |

1229 | Full control of superconducting qubits with combined XYZ lines | Manenti, Riccardo; Sete, Eyob; Chen, Angela; Kulshreshtha, Shobhan; Yeh, Jen-Hao; Oruc, Feyza; Jackson, Keith; Field, Mark; Bestwick, Andrew; Poletto, Stefano | In this work, we present a method to integrate microwave lines and flux lines into a single “XYZ line” without significantly impacting the qubit relaxation time. | Session 61: Superconducting Qubit Systems |

1230 | Fast feedback for active noise cancellation in superconducting qubits | Vepsalainen, Antti; Winik, Roni; Karamlou, Amir; Braumueller, Jochen; Sung, Youngkyu; Kannan, Bharath; Kjaergaard, Morten; Kim, David; Yoder, Jonilyn; Niedzielski, Bethany; Orlando, Terry; Gustavsson, Simon; Oliver, William | Here we show that by employing fast-feedback to cancel low-frequency noise disturbing the circuit, the fluctuations in the qubit frequency are stabilized, resulting in improved coherence time and gate fidelities. | Session 61: Superconducting Qubit Systems |

1231 | Integrating low-loss magnetic couplers with superconducting 3d-cavities | Zhao, Ziyi; Rosenthal, Eric; Vale, Leila; Hilton, Gene; Lehnert, Konrad | We present a design to magnetically couple cavities to the network via balanced superconducting switches, whose coupling strength can be varied to change the connectivity of a network. | Session 61: Superconducting Qubit Systems |

1232 | Observation of qubit-photon bound states in a rectangular waveguide QED system | Nandakumar, Pradeepkumar; Rosario Hamann, Jose Andres; Navarathna, Rohit; Zanner, Maximilian; Pletyukhov, Mikhail; Fedorov, Arkady | Here, we report observation of an atom-photon bound state with a transmon qubit inserted in a three-dimensional rectangular waveguide. | Session 61: Superconducting Qubit Systems |

1233 | Exploiting real-time classical resources in a quantum algorithm | Corcoles, Antonio; Takita, Maika; Inoue, Ken; Lekuch, Scott; Minev, Zlatko; Chow, Jerry; Gambetta, Jay | In this talk we present a demonstration of how this real-time classical computing can improve the results of a quantum algorithm executed on a system of superconducting qubits. | Session 61: Superconducting Qubit Systems |

1234 | Characterization of Superconducting Quantum Transmission Line Metamaterials | Tai, Tamin; Cai, Jingnan; Anlage, Steven | Characterization of Superconducting Quantum Transmission Line Metamaterials | Session 61: Superconducting Qubit Systems |

1235 | Quantum control of cavities using an improved SNAP protocol without coherent errors | Landgraf, Jonas; Foesel, Thomas; Marquardt, Florian | Based on geometrical arguments, we have developed a scheme to completely suppress the coherent errors above a certain threshold for the pulse time. | Session 61: Superconducting Qubit Systems |

1236 | Single Flux Quantum-Based Superconducting Qubit Control and Quasiparticle Mitigation: Part I | Ballard, Andrew; Iaia, Vito; McBroom, Tianna; Liu, Yebin; Dodge, Kenneth; Ku, Jaseung; Liu, Chuan-Hong; Opremcak, Alexander; Wilen, Chris; Leonard, Edward; Beck, Matthew; Abdullah, Sohair; DuBois, Jonathan; Schmidt, Dan; Lucas, Tammy; Vissers, Michael; Biesecker, John; Olaya, David; Castellanos-Beltran, Manuel; Hopkins, Peter; Ullom, Joel; Benz, Samuel; McDermott, Robert; Plourde, Britton | In order to suppress QP poisoning, we have developed a multi-chip module with an SFQ driver on a classical control chip that is flip-chip coupled to a superconducting transmon qubit on a separate quantum chip. | Session 61: Superconducting Qubit Systems |

1237 | Single Flux Quantum-Based Superconducting Qubit Control and Quasiparticle Mitigation: Part 2 | Liu, Chuanhong; Opremcak, Alexander; Wilen, Chris; Leonard, Edward; Beck, Matthew; Abdullah, Sohair; Ballard, Andrew; Iaia, Vito; McBroom, Tianna; Liu, Yebin; Dodge, Kenneth; Ku, Jaseung; Olaya, David; Schmidt, Dan; Lucas, Tammy; Biesecker, John; Castellanos-Beltran, Manuel; vissers, michael; Hopkins, Peter; Ullom, Joel; Benz, Samuel; DuBois, Jonathan; Plourde, Britton; McDermott, Robert | Here we introduce superconducting bandgap engineering as a mitigation strategy to suppress QP poisoning in this system. | Session 61: Superconducting Qubit Systems |

1238 | Integrated cavity parametric amplifier for qubit readout in 3D circuit QED architecture | Wang, Zhixin; Venkatraman, Jayameenakshi; Xiao, Xu; Mundhada, Shantanu; Sivak, Volodymyr; Shankar, Shyam; Devoret, Michel | Here we introduce a new design in which the latter is placed into the former—a symmetric superconducting artificial "molecule" housed in a 3D readout cavity that contains both the qubit and the quantum-limited parametric amplifier to read it out. | Session 61: Superconducting Qubit Systems |

1239 | Protocols for robust generation of microwave photonic graph states from superconducting qubits | Liu, Chenxu; Barnes, Edwin; Economou, Sophia | We present protocols that use superconducting qubits for robust generation of microwave photon cluster and graph states. | Session 61: Superconducting Qubit Systems |

1240 | Probing nonlinear photon scattering with artificial atoms coupled to a slow-light waveguide | Scigliuzzo, Marco; Calajò, Giuseppe; Ciccarello, Francesco; Perez Lozano, Daniel; Bengtsson, Andreas; Scarlino, Pasquale; Wallraff, Andreas; Delsing, Per; Gasparinetti, Simone | We couple two frequency-tunable transmon qubits to the array and study their interaction with this engineered environment. | Session 61: Superconducting Qubit Systems |

1241 | Dynamical decoupling in two-qubit interactions | Qiu, Jiawei; Zhou, Yuxuan; Yuan, Jiahao; Zhang, Libo; Liu, Weiyang; Liu, Song; Yan, Fei | In this talk, we demonstrate extending dynamical decoupling techniques to a multiqubit system including a tunable coupler, successfully suppressing low-frequency noise and elongating decoherence time. | Session 61: Superconducting Qubit Systems |

1242 | Adiabatic controlled-phase gate with fixed-frequency qubits enabled by tunable coupler | Chu, Ji; Yan, Fei | In this talk, we present the theoretical framework of this two-qubit gate scheme, discussing the process of controlling longitudinal coupling strength by modulating the coupler frequency. | Session 61: Superconducting Qubit Systems |

1243 | Broadband Microwave Isolation via Adiabatic Mode Conversion in Superconducting Coupled Transmission Lines | Naghiloo, Mahdi; Peng, Kaidong; Ye, Yufeng; Cunningham, Gregory; O’Brien, Kevin | We propose a new scheme that combines parametric mode conversion and adiabatic techniques in a pair of coupled nonlinear Josephson junction transmission lines to realize broadband isolation without magnetic elements. | Session 61: Superconducting Qubit Systems |

1244 | MIRROR, MIRROR: Landau-Zener-Stückelberg-Majorana interferometry of a superconducting qubit in front of a mirror | Wen, Ping Yi; Ivakhnenko, Oleh; Nakonechnyi, Mikhail; Suri, Baladitya; Lin, J. -J; Lin, W. -J; Chen, Jeng-Chung; Shevchenko, Sergey; Nori, Franco; Hoi, Io Chun | We investigate the Landau-Zener-Stückelberg-Majorana (LZSM) interferometry of a superconducting qubit in a semi-infinite transmission line terminated by a mirror. | Session 61: Superconducting Qubit Systems |

1245 | Waveguide Quantum Electrodynamics with Superconducting Artificial Giant Atoms | Kannan, Bharath; Ruckriegel, Max; Campbell, Daniel; Frisk Kockum, Anton; Braumueller, Jochen; Kim, David; Kjaergaard, Morten; Krantz, Philip; Melville, Alexander; Niedzielski, Bethany; Vepsäläinen, Antti; Winik, Roni; Yoder, Jonilyn; Nori, Franco; Orlando, Terry; Gustavsson, Simon; Oliver, William | Waveguide Quantum Electrodynamics with Superconducting Artificial Giant Atoms | Session 61: Superconducting Qubit Systems |

1246 | Cancellation of unwanted ZZ interactions for cross-resonance gates by superconducting qubit engineering | Winik, Roni; Leroux, Catherine; Di Paolo, Agustin; Hazard, Thomas; Shillito, Ross; Vepsalainen, Antti; Sung, Youngkyu; Ao, Ziqiao; Kjaergaard, Morten; Braumueller, Jochen; Schwartz, Mollie; Serniak, Kyle; Kim, David; Yoder, Jonilyn; Melville, Alexander; Niedzielski, Bethany; Blais, Alexandre; Gustavsson, Simon; Oliver, William | In this talk, we augment the transmon-qubit architecture by introducing a new superconducting qubit similar to the transmon but with positive anharmonicity. | Session 61: Superconducting Qubit Systems |

1247 | Electron shelving of a superconducting artificial atom | Lin, Yen-Hsiang; Cottet, Nathanael; Xiong, Haonan; Nguyen, Long; Manucharyan, Vladimir | Without introducing extra degree of freedom, we apply the electron shelving idea and demonstrate a conditional fluorescence readout. | Session 61: Superconducting Qubit Systems |

1248 | Scalable multiphoton generation from cavity-synchronized single-photon sources | Li, Ming; Garcia-Ripoll, Juan Jose; Ramos, Tomas | We propose an efficient, scalable and deterministic scheme to generate up to hundreds of indistinguishable photons over multiple channels, on demand. | Session 61: Superconducting Qubit Systems |

1249 | Spectroscopic Observation of Crossover from Classical Duffing Oscillator to Kerr Parametric Oscillator | Yamaji, Tomohiro; Kagami, Sota; Yamaguchi, Aiko; Satoh, Tetsuro; Koshino, Kazuki; Goto, Hayato; Lin, Zhirong; Nakamura, Yasunobu; Yamamoto, Tsuyoshi | We study microwave response of a Josephson parametric oscillator consisting of a superconducting transmission-line resonator with an embedded dc-SQUID. | Session 61: Superconducting Qubit Systems |

1250 | From quantum circuit refrigeration to lasing: master equation approach | Hsu, Hao | Here we discuss a master equation approach to the dynamics of a QCR coupled to a two-level system. | Session 61: Superconducting Qubit Systems |

1251 | Digital-Analog Quantum Simulations Using The Cross-Resonance Effect | Gonzalez-Raya, Tasio; Asensio-Perea, Rodrigo; Martin, Ana; Céleri, Lucas; Sanz, Mikel; Lougovski, Pavel; Dumitrescu, Eugen | In an appropriate reference frame, we find a two-local Hamiltonian comprised of non-commuting interactions. | Session 61: Superconducting Qubit Systems |

1252 | Probing Multi-Site Correlators in a Bose Hubbard lattice | Saxberg, Brendan; Roberts, Gabrielle; Vrajitoarea, Andrei; Panetta, Margaret; Ma, Ruichao; Schuster, David; Simon, Jon | We build a 1D Bose-Hubbard lattice for photons where capacitively coupled transmon qubits serve as lattice sites, and the transmon anharmonicity corresponds to strong photon-photon collisions. | Session 61: Superconducting Qubit Systems |

1253 | Photon decay in circuit QED as a new resource for quantum impurity simulations | Kuzmin, Roman; Grabon, Nicholas; Mehta, Nitish; Burshtein, Amir; Goldstein, Moshe; Manucharyan, Vladimir | We present a new approach to analog simulations of quantum impurity problems in circuit QED. | Session 61: Superconducting Qubit Systems |

1254 | Large fluctuations of T1 in long-lived transmon qubits | Li, Kungang; Dutta, Sudeep; Zhang, Rui; Steffen, Zachary; Poppert, Dylan; Bowser, Jeffrey; Keshvari, Shahriar; Palmer, Benjamin; Lobb, Christopher; Wellstood, Frederick | We discuss why this behavior is not consistent with the two most commonly proposed mechanisms, fluctuations in two-level-system dielectric loss and fluctuations in the density of non-equilibrium quasiparticles, and propose an alternative mechanism that is consistent with the observed behaviors. | Session 61: Superconducting Qubit Systems |

1255 | Deterministic Generation of Multipartite-Entangled Microwave Photonic States | Besse, Jean-Claude; Reuer, Kevin; Collodo, Michele; Wulff, Arne; Wernli, Lucien; Espinosa Copetudo, Adrian; Malz, Daniel; Magnard, Paul; Akin, Abdulkadir; Gabureac, Mihai; Norris, Graham J.; Cirac, Juan; Wallraff, Andreas; Eichler, Christopher | Here, we demonstrate a unique superconducting device able to deterministically generate a wide family of entangled states of microwave radiation such as cluster, GHZ, and W states [1]. | Session 61: Superconducting Qubit Systems |

1256 | Ground state of open circuit QED systems in the deep-strong coupling regime | Shitara, Tomohiro; Bamba, Motoaki; Yoshihara, Fumiki; Fuse, Tomoko; Ashhab, Sahel; Semba, Kouichi; Koshino, Kazuki | We investigate theoretically how the ground state of a qubit-resonator system in the deep-strong coupling regime is affected by the coupling to an environment. | Session 61: Superconducting Qubit Systems |

1257 | True photon blockade effects with arbitrarily weak nonlinearities | Lingenfelter, Andrew; Roberts, David; Clerk, Aashish | We show how our scheme can be implemented using a rather generic setup of a driven cavity mode with a Kerr (i.e Hubbard-U) type nonlinearity. | Session 61: Superconducting Qubit Systems |

1258 | Towards a 4-local coupler for superconducting flux qubits – Part 1: Quantum landscape engineering of the ground state | Menke, Tim; Hirjibehedin, Cyrus; Weber, Steven; Braumüller, Jochen; Vepsäläinen, Antti; Winik, Roni; Samach, Gabriel; Kim, David; Melville, Alexander; Niedzielski, Bethany; Rosenberg, Danna; Schwartz, Mollie; Yoder, Jonilyn; Gustavsson, Simon; Kerman, Andrew; Oliver, William | Here we propose a methodology for adding higher-order polynomial terms into the flux dependence of the circuit ground state by strongly coupling a series of rf SQUIDs, thereby landscaping the spectrum at the fluxon level. | Session 61: Superconducting Qubit Systems |

1259 | Towards a 4-local coupler for superconducting flux qubits – part 2: distinguishing multi-spin interactions from lower-order effects | Bergamaschi, Thomas; Menke, Tim; Hirjibehedin, Cyrus; Weber, Steven; Kerman, Andrew; Oliver, William | Here we present a method to characterize many-local interactions by analyzing the variation of the system’s spectral gap with the local spin fields. | Session 61: Superconducting Qubit Systems |

1260 | Ultrastrong light-matter interaction in a photonic crystal waveguide | Vrajitoarea, Andrei; Belyansky, Ron; Lundgren, Rex; Whitsitt, Seth; Gorshkov, Alexey; Houck, Andrew | Here, we apply this toolbox for exploring the physics of a quantum impurity coupled to the many modes of a photonic crystal. | Session 61: Superconducting Qubit Systems |

1261 | Dynamics of Coupled Hodgkin-Huxley Quantum Neurons | Gonzalez-Raya, Tasio; Sanz, Mikel | The Hodgkin-Huxley model describes the conduction of nervous impulses, realized by flows of different ionic species through the axon’s membrane, through a circuit featuring ionic conductances that depend on previous depolarizing voltages. | Session 61: Superconducting Qubit Systems |

1262 | Fast Tunable Coupler Architecture for Fixed Frequency Transmons | Stehlik, Jiri; Zajac, David; Underwood, Devin; Phung, Timothy; Kumph, Muir; Blair, John; Carnevale, Santino; Klaus, Dave; Carniol, April; Keefe, George; Steffen, Matthias; Dial, Oliver | In this talk we will explore a tunable capacitive coupler, which interferes a direct coupling capacitance with coupling through a tunable qubit. | Session 62: Superconducting Qubits and Couplers |

1263 | Spectators Errors in Multiqubit Tunable Coupling Architectures | Zajac, David; Stehlik, Jiri; Underwood, Devin; Phung, Timothy; Kumph, Muir; Blair, John; Carnevale, Santino; Klaus, Dave; Carniol, April; Keefe, George; Steffen, Matthias; Dial, Oliver | With near-detuned qubits, we find that stray coupling can induce gate errors of order 1% when performing simultaneous gates if the microwave crosstalk is not carefully engineered. | Session 62: Superconducting Qubits and Couplers |

1264 | A high-fidelity, two-qubit cross-resonance gate using interference couplers | Kandala, Abhinav; Wei, Xuan; Srinivasan, Srikanth; Magesan, Easwar; Carnevale, Santino; Keefe, George; Klaus, Dave; Dial, Oliver; McKay, David | In this talk, we will discuss a novel, fixed-frequency, multi-element coupling architecture for transmon qubits. | Session 62: Superconducting Qubits and Couplers |

1265 | Advances in gates with tunable qubits and tunable couplers | Foxen, Brooks | Quantum algorithms offer a dramatic speedup for computational problems in material science and chemistry. | Session 62: Superconducting Qubits and Couplers |

1266 | Scalable quantum computer with superconducting circuits in the ultrastrong coupling regime | Stassi, Roberto; Cirio, Mauro; Nori, Franco | To overcome this limitation, we propose a scalable architecture to simultaneously connect several pairs of distant qubits via a dispersively coupled quantum bus. | Session 62: Superconducting Qubits and Couplers |

1267 | Entangling gates at dynamical sweet spots. Part 2: Experiment. | Valery, Joseph; Chowdhury, Shoumik; Didier, Nicolas | Known techniques for achieving high fidelity gates include modulation of magnetic flux to control tunable transmon frequencies and activate sideband interactions between capacitively-coupled neighbors. | Session 62: Superconducting Qubits and Couplers |

1268 | Demonstration of an All-Microwave Controlled-Phase Gate between Far-Detuned Qubits | Krinner, Sebastian; Kurpiers, Philipp; Royer, Baptiste; Magnard, Paul; Tsitsilin, Ivan; Besse, Jean-Claude; Remm, Ants; Blais, Alexandre; Wallraff, Andreas | Here, we overcome these limitations by realizing an all-microwave controlled-phase gate between two transmon qubits which are far detuned compared to the qubit anharmonicity [1]. | Session 62: Superconducting Qubits and Couplers |

1269 | Demonstration of Entangling Gate for All-to-All Connected Superconducting Qubits | Lu, Marie; Ville, Jean-Loup; Cohen, Joachim; Petrescu, Alexandru; Schreppler, Sydney; Marchenkov, Alexei; Livingston, William; Banerjee, Archan; Kreikebaum, John Mark; Blais, Alexandre; Santiago, David; Siddiqi, Irfan | We demonstrate a Mølmer-Sørensen-like interaction through the use of shared coplanar waveguide (CPW) resonators to couple multiple superconducting qubits and analyze the effect of qubit lifetimes in the Rabi dressed frame on our gate fidelity. | Session 62: Superconducting Qubits and Couplers |

1270 | Investigating the speed limit of two-qubit entangling gates with superconducting qubits | Howard, Joel; Long, Junling; Bal, Mustafa; ZHAO, RUICHEN; Wang, Haozhi; Zhao, Tongyu; Pappas, David; Gong, Zhexuan; Singh, Meenakshi | We seek to demonstrate such a speed limit experimentally using two superconducting transmon qubits with a fixed capacitive coupling. | Session 62: Superconducting Qubits and Couplers |

1271 | Novel Coupling for RIP Gate Based Devices | Kumph, Muir; Raftery, James; Shanks, Will; Finck, Aaron; Blair, John; Keefe, George; Carnevale, Santino; Arena, Vincent; Hall, Shawn; Klaus, Dave; Dial, Oliver | Here we present a novel RIP-coupler based 6 qubit device with 2D square lattice connectivity to demonstrate two-qubit gates with a fidelity exceeding 98.8% running algorithmic benchmarks. | Session 62: Superconducting Qubits and Couplers |

1272 | Entangling gates at dynamical sweet spots. Part 1: Theory. | Valery, Joseph; Chowdhury, Shoumik; Didier, Nicolas | We show how two-tone modulation of the flux bias, a bichromatic modulation, gives rise to a continuum of dynamical sweet spots where dephasing due to slow flux noise is suppressed to first order for a wide range of time-averaged qubit frequencies. | Session 62: Superconducting Qubits and Couplers |

1273 | High-fidelity controlled-Z gate with maximal intermediate leakage operating at the speed limit in a superconducting quantum processor | Ali, Hany; Negirneac, Victor; Muthusubramanian, Nandini; Battistel, Francesco; Sagastizabal, Ramiro; S Moreira, Miguel; Marques, Jorge; Vlothuizen, Wouter; Beekman, Marc; Haider, Nadia; Bruno, Alessandro; DiCarlo, Leonardo | Here, we introduce the sudden variant (SNZ) of the Net Zero scheme realizing high-fidelity, repeatable controlled-Z (CZ) gates by baseband flux control of transmon frequency. | Session 62: Superconducting Qubits and Couplers |

1274 | Superconducting-qubit coupler design with exponentially large on-off ratio | Leroux, Catherine; Di Paolo, Agustin; Blais, Alexandre | We present a design for a superconducting-qubit coupler featuring an exponentially large on-off ratio that is controlled by the amplitude of a microwave drive. | Session 62: Superconducting Qubits and Couplers |

1275 | Distinguishing and Mitigating Decoherence Mechanisms in Transmon Qubits | Serniak, Kyle; Calusine, Greg; Melville, Alexander; Woods, Wayne; Hazard, Thomas; Niedzielski, Bethany; Kim, David; Yoder, Jonilyn; Oliver, William | In this talk, we will outline the characterization tools that we use to assess many of the dominant contributions to energy relaxation in superconducting qubits, including dielectric two-level systems and nonequilibrium quasiparticles, as a step towards developing a holistic account of transmon decoherence. | Session 63: Superconducting Qubits: Coherence and Two-Level Systems |

1276 | Spectroscopy of high-frequency TLS defects in superconducting qubits using a spin-locking pulse sequence | Abdurakhimov, Leonid; Mahboob, Imran; Toida, Hiraku; Kakuyanagi, Kosuke; Matsuzaki, Yuichiro; Saito, Shiro | Here, we demonstrate that, in addition to the low-frequency noise, the spin-locking sequence can be used to identify high-frequency two-level-system (TLS) defects, both below and above the qubit frequency. | Session 63: Superconducting Qubits: Coherence and Two-Level Systems |

1277 | Modeling of qubit coherence variability due to two-level systems | Tersoff, Jerry; Hannon, James | Building on this understanding, we implement a device-scale numerical model of a qubit interacting with the surrounding TLSs. | Session 63: Superconducting Qubits: Coherence and Two-Level Systems |

1278 | Dielectric loss at material interfaces in circuit quantum electrodynamics devices | Lahtinen, Valtteri; Möttönen, Mikko | In this work, we discuss methods for measurement-based extraction of the material parameters and ways to overcome the challenges related to the wide range of length scales. | Session 63: Superconducting Qubits: Coherence and Two-Level Systems |

1279 | Investigation into Charge Noise in a Tantalum Transmon on Sapphire Substrate across Higher Energy Levels | Tennant, Daniel; Martinez, Luis; Wilen, Chris; McDermott, Robert; Rosen, Yaniv; DuBois, Jonathan | Here we present interwoven measurements of qubit spectroscopy, Ramsey decays, energy relaxation, and Echo decays across the low-lying one and two photon transitions. | Session 63: Superconducting Qubits: Coherence and Two-Level Systems |

1280 | Positive- and negative-frequency noise from an ensemble of two-level fluctuators | You, Xinyuan; Clerk, Aashish; Koch, Jens | A systematic and computationally convenient way to overcome this issue is to employ the spectator-qubit method: by coupling an auxiliary qubit to the two-level fluctuator ensemble, an analytical approximation for S(ω) fully consistent with the fluctuation–dissipation theorem can be obtained. | Session 63: Superconducting Qubits: Coherence and Two-Level Systems |

1281 | Evaluating Qubit Coherence Statistics in the Presence of Time-Correlated Fluctuations | Calusine, Greg; Serniak, Kyle; Kim, David; Niedzielski, Bethany; Melville, Alexander; Yoder, Jonilyn; Oliver, William | In this work, we investigate the T 1 statistics for set of 54 nominally identical, high-coherence transmon qubits (T 1, T 2 Ramsey, T 2 Echo ~ 100 µs) and use this large data set to study the scaling of the error in the ensemble mean T 1 estimate as a function of number of devices and sampling time. | Session 63: Superconducting Qubits: Coherence and Two-Level Systems |

1282 | Studying magnetic-field resilience of 3D transmons with thin-film AlOx Josephson junctions | Krause, Jonas; Dickel, Christian; Vaal, Elmore; Vielmetter, Michel; Feng, Junya; Bounds, Richard; Catelani, Gianluigi; Fink, Johannes; Ando, Yoichi | We investigate the effect of in-plane magnetic fields up to 1 T on the spectrum and coherence times of thin-film 3D aluminum transmons. | Session 63: Superconducting Qubits: Coherence and Two-Level Systems |

1283 | Improving quality factors of superconducting coplanar wave guide resonators by surface passivation with self-assembled monolayer | Al Ghadeer, Mohammed; Hajr, Ahmed; Banerjee, Archan; Rao, Saleem; Kreikebaum, John Mark; Ogletree, D. Frank; Altoe, Virginia; Siddiqi, Irfan | In this work, we show the characterization and fabrication of niobium CPW resonators with more than 10 6 internal quality factors at single-photon-excitation power, measured at 100 mK, for a particular surface treatment using self-assembled monolayers (SAM) molecules. | Session 63: Superconducting Qubits: Coherence and Two-Level Systems |

1284 | Power and temperature dependence of High Q superconducting resonators | Alexander, Ashish; Weddle, Christopher; Richardson, Christopher | Here we propose a two-temperature, power, and temperature dependent model to evaluate resonator losses that define the driven quasiparticle density by a separate effective temperature than the bath temperature. | Session 63: Superconducting Qubits: Coherence and Two-Level Systems |

1285 | Investigating the mechanism of single-electron tunneling in charge-parity-sensitive transmons | Diamond, Spencer; Fatemi, Valla; Hays, Max; Serniak, Kyle; Frunzio, Luigi; Schoelkopf, Robert; Glazman, Leonid; Devoret, Michel | Here, we will present theoretical and experimental results demonstrating that adding flux-tunability to a charge-parity-sensitive transmon can distinguish the contributions of different single-electron tunneling processes in our devices. | Session 63: Superconducting Qubits: Coherence and Two-Level Systems |

1286 | Probing hundreds of individual two-level defects in polycrystalline and amorphous alumina. | Hung, Chih-Chiao; Forouzani, Neda; Yu, Liuqi; Fritz, Stefan; Gerthsen, Dagmar; Osborn, Kevin | In this study we extend the quantitative data available on TLSs by using a superconducting resonator to characterize two alumina film types: polycrystalline and amorphous. | Session 63: Superconducting Qubits: Coherence and Two-Level Systems |

1287 | Flux Noise and Spin Dynamics of Multiple Interacting Adsorbates on Superconducting Qubits | Ray, Keith; Tamm, Artur; Rosen, Yaniv; DuBois, Jonathan; Lordi, Vincenzo | To better understand the spin dynamics of these fluctuating adsorbates we have extended our model for interacting adsorbed paramagnetic O 2 molecules to include other species adsorbed from the device operation atmosphere, including water at different coverages. | Session 63: Superconducting Qubits: Coherence and Two-Level Systems |

1288 | Ramsey Frequency Beating in the Higher Level States of a 3D Transmon | Martinez, Luis; Rosen, Yaniv; Ray, Keith; Tennant, Daniel; DuBois, Jonathan | We present the observation of a beating phenomenon in the Ramsey fringes of higher qudit levels which is only visible in the overlay of several independent Ramsey measurements. | Session 63: Superconducting Qubits: Coherence and Two-Level Systems |

1289 | Evidence for a gap in the density of states of two-level systems in amorphous silicon | Yu, Liuqi; Rosen, Yaniv; Osborn, Kevin | Evidence for a gap in the density of states of two-level systems in amorphous silicon | Session 63: Superconducting Qubits: Coherence and Two-Level Systems |

1290 | The surface code on the rhombic dodecahedron | Landahl, Andrew | I present a jaunty little [[14, 3, 3]] non-CSS surface code that can be described using a rhombic dodecahedron. | Session 64: Theory of Quantum Error Correction |

1291 | Continuous-variable error correction for general Gaussian noises | Wu, Jing; Zhuang, Quntao | Here we extend the study to multiple oscillators under independent but inhomogeneous Gaussian noises. | Session 64: Theory of Quantum Error Correction |

1292 | Quantum LDPC codes from SAT instances | Tremblay, Maxime; Kourtis, Stefanos | In this talk, I will introduce a new approach to design such codes based on solution of some satisfiability problems. | Session 64: Theory of Quantum Error Correction |

1293 | Statistical Mechanics of Quantum Error-Correcting Codes | Li, Yaodong; Fisher, Matthew P | Building upon a general formula relating the error-susceptibility of a subregion to its entanglement properties, and a previously established mapping between entanglement entropies and domain wall free energies of an underlying spin model, we propose a statistical mechanical description of the QECC in terms of "entanglement domain walls". | Session 64: Theory of Quantum Error Correction |

1294 | Non-abelian topological error correction with Turaev-Viro codes and the estimation of the error threshold | Schotte, Alexis; Zhu, Guanyu; Burgelman, Lander; Verstraete, Frank | We introduce a set of measurements and unitary operators allowing one to take any state to the string-net subspace, and a set of measurement operators corresponding to the anyonic charge of a single plaquette. | Session 64: Theory of Quantum Error Correction |

1295 | Conservation laws and quantum error correction | Brown, Benjamin | In this talk I will argue that this perspective on decoding gives us a unifying principle to design decoding algorithms for exotic codes, as well as new decoding algorithms that are specialised to the noise that a code will experience. | Session 64: Theory of Quantum Error Correction |

1296 | Quantum error correction with bosonic-Bacon-Shor codes | Tanuarta, Stefanus; Grimsmo, Arne | In this talk, we present numerical results for error correction where single-mode bosonic codes are concatenated with a Bacon-Shor code. | Session 64: Theory of Quantum Error Correction |

1297 | Master Equations for Error-Suppressed Hamiltonian Quantum Computing | Munoz-Bauza, Humberto; Lidar, Daniel | We derive Markovian master equations for systems encoded with an error detecting code protecting the code space against interactions with the environment. | Session 64: Theory of Quantum Error Correction |

1298 | Minimal distances for certain quantum product codes and tensor products of chain complexes | Zeng, Weilei; Pryadko, Leonid | We use a map to quantum error-correcting codes and a subspace projection to get lower bounds for minimal homological distances in a tensor product of two chain complexes of vector spaces over a finite field. | Session 64: Theory of Quantum Error Correction |

1299 | Autonomous Stabilization of Finite-energy Gottesman-Kitaev-Preskill States | Royer, Baptiste; Singh, Shraddha; Girvin, Steven | In this talk, we introduce an exact theory of finite-energy GKP states. | Session 64: Theory of Quantum Error Correction |

1300 | Subsystem codes with high thresholds by gauge fixing and reduced qubit overhead | Higgott, Oscar; Breuckmann, Nikolas | We introduce a technique that uses gauge fixing to significantly improve the quantum error correcting performance of subsystem codes. | Session 64: Theory of Quantum Error Correction |

1301 | Topological quantum error correction in fractal dimensions I: code construction and logical gates | Zhu, Guanyu; Dua, Arpit; Jochym-O’Connor, Tomas | In this work, we consider topological codes defined on a wide class of fractal lattices, which can be considered as a usual d-dimensional lattice with holes at all length scales and correspond to fractal (Hausdorff) dimension $d-\delta$ ($\delta>0$). | Session 64: Theory of Quantum Error Correction |

1302 | Topological quantum error correction in fractal dimensions II: decoding and threshold estimation | Dua, Arpit; Zhu, Guanyu; Jochym-O’Connor, Tomas | We investigate quantum error correction with topological codes on 3D fractal lattices with Hausdorff dimension 3-δ. | Session 64: Theory of Quantum Error Correction |

1303 | Quantum Error Correction: How To Get Below Threshold | Terhal, Barbara | We review some novel developments in the theory of quantum error correction and discuss whether they could be useful for engineering quantum error correction in practice. | Session 65: Topological Quantum Information |

1304 | Experimental characterization of the 4D tensor monopole and topological nodal rings | Li, Changhao; Chen, Mo; Palumbo, Giandomenico; Zhu, Yan-Qing; Goldman, Nathan; Cappellaro, Paola | Using two complementary methods, we reveal the existence of the tensor monopole through measurements of its quantized topological invariant. | Session 65: Topological Quantum Information |

1305 | Quantum circuits for topological state generation | Liao, Pengcheng; Feder, David | In this work, we use the correspondence between stabilizer topological codes and graph states to obtain explicit families of quantum circuits for topological state generation. | Session 65: Topological Quantum Information |

1306 | Protected superconducting qubit encoded in the topological phase of the transverse Ising model | Ouellet-Plamondon, Clauderic; Archambault, Chloe; Annabestani, Razieh; Ethier-Majcher, Gabriel; Najafi-Yazdi, Alireza | In this work, we present a superconducting circuit that can implement the topological phase of the TFIM. | Session 65: Topological Quantum Information |

1307 | Z2 Lattice Gauge Theories and Kitaev’s Toric Code: A Scheme for Analog Quantum Simulation | Homeier, Lukas; Schweizer, Christian; Fedorov, Arkady; Grusdt, Fabian | Here we propose a building block for Z2 lattice gauge theories coupled to dynamical matter and demonstrate how it allows for an implementation of the toric-code groundstate and its topological excitations. | Session 65: Topological Quantum Information |

1308 | Persistence of Topological Phases in Non-Hermitian Quantum Walks | Mittal, Vikash; Raj, Aswathy; Dey, Sanjib; Goyal, Sandeep | We investigate the behaviour of topological states in quantum walks in the presence of a lossy environment. | Session 65: Topological Quantum Information |

1309 | Measurement-based quantum gate teleportation and the degeneracy of the entanglement spectrum: beyond symmetry protected topological order | Liu, Zhuohao; Feder, David | We explore the implications of this possibility for quantum gate teleportation in one-dimensional spin chains; while the teleported gates are offered no protection from errors in this scheme, it would greatly expand the resource states able to support MBQC. | Session 65: Topological Quantum Information |

1310 | Symmetry-protected Sign Problem and Magic in Quantum Phases of Matter | Ellison, Tyler; Kato, Kohtaro; Liu, Zi-Wen; Hsieh, Timothy | We introduce the concepts of a symmetry-protected sign problem and symmetry-protected magic, defined by the inability of symmetric finite-depth quantum circuits to transform a state into a non-negative real wave function and a stabilizer state, respectively. | Session 65: Topological Quantum Information |

1311 | Axionic Quantum Memory | Bray-Ali, Noah | We propose to store quantum information in the form of a dark-state axionic polariton. | Session 65: Topological Quantum Information |

1312 | Topological quantum state transfer in the Creutz ladder | Zurita, Juan; Creffield, Charles; Platero, Gloria | In this work [4], we propose a robust, highly controllable quantum state transfer protocol that exploits these features and could be of interest in the quantum information and computation fields. | Session 65: Topological Quantum Information |

1313 | Quantum computational advantage with string order parameters of 1D symmetry-protected topological order | Daniel, Austin; Miyake, Akimasa | Here, we show advantageous strategies for these nonlocal games for generic ground states of one-dimensional symmetry-protected topological orders (SPTO), when an invariant of SPTO known as a twist phase is nontrivial and -1. | Session 65: Topological Quantum Information |

1314 | Robustness of topology of wavefunctions in NISQ quantum machines | Xiao, Xiao; Freericks, James; Kemper, Alexander | Here we demonstrate a general way to measure the topological invariants on NISQ quantum computers. | Session 65: Topological Quantum Information |

1315 | Observation of non-Hermitian topology with non-unitary dynamics of solid-state spins | Zhang, Wengang; Ouyang, Xiaolong; Huang, Xianzhi; Wang, Xin; zhang, huili; yu, yefei; Chang, Xiuying; Deng, Dongling; Duan, Luming | Here, we implement the non-Hermitian Su-Schrieffer-Heeger (SSH) hamiltonian, which is a prototypical model for studying non-Hermitian topological phases, with a solid-state quantum simulator consisting of an electron spin and a 13C nuclear spin in a nitrogen-vacancy center in a diamond. | Session 65: Topological Quantum Information |