# Highlights of Quantum Information (DQI) Talks @ APS 2019 March Meeting

American Physics Society (APS) March meeting is one of the largest physics meetings in the world. In 2019, it was held in Boston, Massachusetts. More than 10,000 talks were presented in this meeting. To help the community quickly catch up on the work presented in this meting, 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 | Multilayer coaxial superconducting circuits with integrated 3D wiring | Leek, Peter | In this talk I will present an overview of an approach that builds on a coaxially-symmetric circuit QED unit cell with out-of-plane wiring [1] that provides a simple route to scaling to grids of many qubits. | Session 1: 3D Integration for Superconducting Qubits |

2 | Flux Tunable Superconductings Qubits With 3D Wiring | Bejanin, Jeremy; Earnest, Carolyn; McConkey, Thomas; Peters, Evan; Mariantoni, Matteo | In this talk, we show and characterize the performance of tunable superconducting Xmon transmon qubits using the quantum socket, for which the control wiring is fully 3D, including the fast flux bias lines used for frequency tuning. | Session 1: 3D Integration for Superconducting Qubits |

3 | Increasing reliability for 3D integrated high-coherence superconducting qubits | Niedzielski, Bethany; Kim, David; Yoder, Jonilyn; Rosenberg, Danna; Schwartz, Mollie; Das, Rabindra; Melville, Alexander; Yost, Donna-Ruth; Mallek, Justin; Day, Alexandra; Weber, Steven; Hirjibehedin, Cyrus; Oliver, William | In this talk, we will describe our process for using silicon hard-stop mesas to control chip spacing and tilt, and our integration of these features with our high-coherence superconducting qubit fabrication process. | Session 1: 3D Integration for Superconducting Qubits |

4 | 3D-wired coaxial circuit QED I: Extension to multi-qubit devices | Jebari, Salha; Rahamim, Joseph; Patterson, Andrew; Spring, Peter; Tsunoda, Takahiro; Sosnina, Sophia; Esposito, Martina; Ratter, Kitti; Tancredi, Giovanna; Vlastakis, Brian; Leek, Peter | We present the performance of multi-qubit circuits based on this architecture, including coherence times and two-qubit gate fidelities. | Session 1: 3D Integration for Superconducting Qubits |

5 | 3D-wired coaxial circuit QED II: Evaluation of crosstalk | Rahamim, Joseph; Jebari, Salha; Patterson, Andrew; Spring, Peter; Tsunoda, Takahiro; Sosnina, Sophia; Esposito, Martina; Ratter, Kitti; Tancredi, Giovanna; Vlastakis, Brian; Leek, Peter | We present a careful characterisation of resonator and qubit control-line crosstalk, as well as measurement crosstalk due to coupling between neighboring qubits and resonators. | Session 1: 3D Integration for Superconducting Qubits |

6 | Superconducting Qubits Integrated with Superconducting Through-Substrate Vias (TSVs): Fabrication | Yost, Donna-Ruth; Schwartz, Mollie; Rosenberg, Danna; Mallek, Justin; Das, Rabindra; Day, Alexandra; Kim, David; Niedzielski, Bethany; Melville, Alexander; Woods, Wayne; Yoder, Jonilyn; Kerman, Andrew; Oliver, William | In this talk we describe our process flow for fabricating wafers of superconducting through-substrate vias (TSVs) which may be integrated directly into superconducting qubit chips and/or bump bond integrated with high-coherence qubits to carry signals to and from the qubit layer. | Session 1: 3D Integration for Superconducting Qubits |

7 | Superconducting qubits integrated with superconducting through-substrate vias: Measurement | Schwartz, Mollie; Yost, Donna-Ruth; Rosenberg, Danna; Mallek, Justin; Das, Rabindra; Day, Alexandra; Kim, David; Melville, Alexander; Niedzielski, Bethany; Yoder, Jonilyn; Kerman, Andrew; Oliver, William | We discuss recent results demonstrating superconducting qubit control, readout, and integration with high-aspect ratio superconducting TSVs. | Session 1: 3D Integration for Superconducting Qubits |

8 | Multilayer Microwave Integrated Quantum Circuits: Part 1 | Lei, Chan U; Krayzman, Lev; Ganjam, Suhas; Brecht, Teresa; Axline, Christopher; Chu, Yiwen; Burkhart, Luke; Frunzio, Luigi; Schoelkopf, Robert | In this talk, we discuss the multilayer microwave integrated quantum circuit (MMIQC), a platform which combines planar circuits with 3D superconducting enclosures to gain scalability while maintaining coherence. | Session 1: 3D Integration for Superconducting Qubits |

9 | Multilayer Microwave Integrated Quantum Circuits: Part 2 | Krayzman, Lev; Lei, Chan U; Ganjam, Suhas; Brecht, Teresa; Axline, Christopher; Chu, Yiwen; Frunzio, Luigi; Schoelkopf, Robert | In this talk, we describe a model for quantifying the loss associated with the seam, present our progress on indium bonding in microwave circuits, and discuss its application in scalable 3D superconducting quantum circuits. | Session 1: 3D Integration for Superconducting Qubits |

10 | Development of superconducting connection by flip-chip bonding for a multilayer superconducting quantum annealing machine | Makise, Kazumasa; Maezawa, Masaaki; Hidaka, Mutsuo; Nakagawa, Hiroshi; Kikuchi, Katsuya; Kawabata, Shiro | To solve this problem, we have proposed an “QUIP” (Qubit-chip, Interposer and Package-substrate) a 2.5-dimensional (2.5 D) packaging structure. | Session 1: 3D Integration for Superconducting Qubits |

11 | Intel Superconducting Qubits, Part 1: Performance improvements towards enabling quantum applications | Caudillo, Roman; Michalak, David; Lampert, Lester; Elsherbini, Adel; Falcon, Javier; Nam, Ye Seul; Myers, Preston; Johri, Sonika; Zou, Xiang; Roberts, Jeanette; Bruno, Alessandro; Muthusubramanian, Nandini; Bultink, Cornelis Christiaan; Malinowski, Filip; Haider, Nadia; DiCarlo, Leonardo; Clarke, Jim | Here we present our fabrication capabilities addressing some of these challenges on die sizes ranging from small laterally wirebonded 2-qubit chips to larger flip-chip, ball-grid-array-bonded 7- and 17-qubit chips. | Session 1: 3D Integration for Superconducting Qubits |

12 | Intel Superconducting Qubits, Part 2: Integration on through-silicon-via (TSV) substrates. | Michalak, David; Caudillo, Roman; Lampert, Lester; Elsherbini, Adel; Falcon, Javier; Nam, Ye Seul; Myers, Preston; Roberts, Jeanette; Bruno, Alessandro; Muthusubramanian, Nandini; Bultink, Cornelis Christiaan; Malinowski, Filip; Haider, Nadia; DiCarlo, Leonardo; Clarke, Jim | We present recent microwave modeling and fabrication results on qubit chips containing membrane-covered TSVs. | Session 1: 3D Integration for Superconducting Qubits |

13 | 3D Integration of Superconducting Qubits in a Three-Tiered Quantum Processor | Mallek, Justin; Yost, Donna-Ruth; Das, Rabindra; Rosenberg, Danna; Bolkhovsky, Vladimir; Calusine, Greg; Cook, Matthew; Golden, Evan; Kim, David; Melville, Alexander; Niedzielski, Bethany; Schwartz, Mollie; Stull, Corey; Tolpygo, Sergey; Woods, Wayne; Yoder, Jonilyn; Oliver, William | We will discuss our work on the fabrication and integration of the interposer with superconducting TSVs as well as the superconducting multichip module and the electrical data measured from test structures. | Session 1: 3D Integration for Superconducting Qubits |

14 | Coherent control of large ion crystals in a Penning trap quantum simulator | Marciniak, Christian; Wolf, Robert; Biercuk, Michael | We will present recent achievements towards building a quantum simulator for transverse-field Ising-type Hamiltonians based on laser-cooled Coulomb crystals of 9Be + in a Penning trap. | Session 2: AMO Quantum Information |

15 | Integrated multi-wavelength photonic addressing of trapped ion qubits | Niffenegger, Robert; Stuart, Jules; Bruzewicz, Colin; McConnell, Robert; West, Gavin; Simon, Garrett; Kharas, Dave; Sorace-Agaskar, Cheryl; Bramhavar, Suraj; Sage, Jeremy; Chiaverini, John | Here we have designed and fabricated an ion trap chip with integrated photonic waveguides and grating out-couplers for integrated addressing in all of the infrared, visible, and ultraviolet wavelengths required to cool and control 88Sr+ trapped ion qubits. | Session 2: AMO Quantum Information |

16 | Phase-modulated entangling gates robust against static and time-varying errors | Milne, Alistair; Edmunds, Claire; Hempel, Cornelius; Frey, Virginia; Mavadia, Sandeep; Biercuk, Michael | We present a technique that employs discrete phase shifts in the mediating field driving the gate to ensure all modes are de-excited at arbitrary user-defined times, increasing the gate fidelity and scalability. | Session 2: AMO Quantum Information |

17 | Nonlinear quantum Rabi model in trapped ions | Arrazola, Iñigo; Cheng, Xiao-Hang; Pedernales, Julen; Lamata, Lucas; Chen, Xi; Solano, Enrique | We propose to use this blockade as a resource for the dissipative generation of high-number Fock states. | Session 2: AMO Quantum Information |

18 | Characterizing Unwanted Motional Coupling in Mølmer-Sørensen Gates | de Castro, Leonardo; Leung, Pak Hong; Iyer, Pavithran; Brown, Kenneth | In this work, we quantify the impact of ignoring non-Markovian features in the noise model for Mølmer–Sørensen gates by developing numerical tools to compute the fidelity of a sequence of N Mølmer–Sørensen gates. | Session 2: AMO Quantum Information |

19 | Scalable Trapped Ion Architectures and Micromotion Enhancement | Ratcliffe, Alexander; Hope, Joseph | Here, I demonstrate that a simple approach to scalability using microtrap arrays provides a feasible road to scalability. | Session 2: AMO Quantum Information |

20 | On-chip optical quantum memory using erbium ions | Craiciu, Ioana; Lei, Mi; Rochman, Jake; Kindem, Jonathan; Bartholomew, John; Miyazono, Evan; Zhong, Tian; Faraon, Andrei | We present an on-chip all-optical quantum memory at telecom wavelengths using the atomic frequency comb protocol. | Session 2: AMO Quantum Information |

21 | Probing amplified spontaneous emission to superradiance transition in cold Cs atoms inside a hollow-core photonic-crystal fiber | Ding, Zhenghao; Yoon, Tae Hyun; Flannery, Jeremy; Anderson, Paul; Duong, Brian; Lin, Sheng-Xiang; Rajabi, Fereshteh; Houde, Martin; Al Maruf, Rubayet; Bajcsy, Michal | We investigate the critical conditions to realize the transition from amplified spontaneous emission (ASE) to superradiance (SR) with an ensemble of laser-cooled Cs atoms inside a hollow-core photonic crystal fiber (HCPCF). | Session 2: AMO Quantum Information |

22 | Time/frequency high-dimensional entanglement via engineered parametric down conversion | Graffitti, Francesco; Barrow, Peter; Proietti, Massimiliano; Pickston, Alex; Kundys, Dmytro; Branczyk, Agata; Fedrizzi, Alessandro | Here we present a new scheme for generating frequency-entangled photon pairs in parametric down-conversion (PDC) processes. | Session 2: AMO Quantum Information |

23 | Polarization-Independent Photon Storage System with Variable Time Delay | Victora, Michelle; Bergmann, Fedor; Goggin, Michael; Wong, Jia Jun; Kwiat, Paul | Here we develop a system with multiplexed free-space storage cavities, able to store single photons with high efficiency over variable delays [N x 12.5 ns, 1 ? N ? 999], and over several nanometers bandwidth. | Session 2: AMO Quantum Information |

24 | Efficient Two-Photon Interference with Pulse-Driven Quantum Emitters in Dynamic Environments | Fotso, Herbert | We find that when the emitters are driven by appropriate pulse sequences, besides their emission spectra having little dependence on the environment[3, 4], photon indistinguishability can be restored to optimal values paving the way for improved efficiency in photon-mediated QIP operations. | Session 2: AMO Quantum Information |

25 | Universal Dynamics of Inhomogeneous Quantum Phase Transitions: Suppressing Defect Formation | Gómez-Ruiz, Fernando; Del Campo, Adolfo | The reduced density of excitations exhibits a much steeper dependence on the quench rate and is also described by a universal power-law, that we demonstrated in a quantum Ising chain. | Session 2: AMO Quantum Information |

26 | Controlling Quantum Spin States and Dynamics with Light | Schleier-Smith, Monika; Davis, Emily; Bentsen, Gregory; Homeier, Lukas | I will describe progress and prospects in tailoring atom-light interactions to enable new directions in quantum simulation and to generate new resources for quantum-enhanced sensing. | Session 2: AMO Quantum Information |

27 | Improved implementation of reflection operators | Narayan Chowdhury, Anirban; Subasi, Yigit; Somma, Rolando | We provide a method that uses a linear combination of unitaries and a version of amplitude amplification to approximate reflection operators over eigenvectors of unitary operators using exponentially less ancillary qubits in terms of the precision of implementing the reflection The gate complexity of our method is comparable to that of the phase estimation approach. | Session 3: Algorithms and Architecture for Quantum Information |

28 | Vibronic Molecular Spectra on a Universal Quantum Computer | Sawaya, Nicolas | With a wholly different approach that uses the quantum phase estimation algorithm in the standard circuit model, we present a quantum algorithm that scales as O(M^2) in both classical and quantum operations, with linear circuit depth. | Session 3: Algorithms and Architecture for Quantum Information |

29 | Quantum Circuit and Algorithm Validation With Prove-It | Witzel, Wayne; Rudinger, Kenneth; Carr, Robert; Sarovar, Mohan | We demonstrate formal quantum algorithm verification using our versatile Python software package called Prove-It [1]. | Session 3: Algorithms and Architecture for Quantum Information |

30 | Hamiltonian and Lindbladian Parameter Estimation | Krastanov, Stefan; Zhou, Sisi; Flammia, Steven; Jiang, Liang | We present a simple but powerful new method to estimate the Hamiltonian (or Lindbladian) governing a quantum system of a few qubits. | Session 3: Algorithms and Architecture for Quantum Information |

31 | Quantum Computation with Quantum Schur Circuits | Havlicek, Vojtech; Strelchuk, Sergii; Temme, Kristan | We give such algorithm by showing that the relevant PQC computation is a quantum Schur circuit and using symmetries of the Schur transformation. | Session 3: Algorithms and Architecture for Quantum Information |

32 | Disentangling quantum algorithms using symmetry | Gunlycke, Daniel; Fischer, Sean; Hellberg, C Stephen; Policastro, Steven; Tafur, Sergio | In this presentation, we will demonstrate how such a reduction could be achieved in a small quantum system using symmetry. In addition to reducing the needed resources, our quantum computer calculations show a significant improvement in accuracy. | Session 3: Algorithms and Architecture for Quantum Information |

33 | Finding paths with quantum walks | Hillery, Mark | Finding paths with quantum walks | Session 3: Algorithms and Architecture for Quantum Information |

34 | Machine learning search for quantum algorithms | Lin, Jian; Lai, Zhong Yuan; Li, Xiaopeng | We benchmark our approach in Grover search and 3-SAT problems, and find that the adiabatic algorithm obtained by our reinforcement learning approach leads to improved performance in the final state fidelity and significant computational speedups for both moderate and large number of qubits compared to conventional algorithms. | Session 3: Algorithms and Architecture for Quantum Information |

35 | Adiabatic Grover’s Algorithm and Graph Theory | Mendelson, Samuel; Farinholt, Jake | We rigorously prove that the graph search algorithm is exactly Grover’s algorithm when the graph is complete. | Session 3: Algorithms and Architecture for Quantum Information |

36 | Many-Body-Localization Transition in a Universal Quantum Circuit Model | Chapman, Adrian; Miyake, Akimasa | We develop both exact and approximate methods to compute out-of-time-ordered correlators for arbitrary universal quantum circuits, taking advantage of the mapping of quantum circuits to the dynamics of interacting fermions in one dimension. | Session 3: Algorithms and Architecture for Quantum Information |

37 | Intermediate-Scale Full State Quantum Circuit Simulation by Using Lossy Data Compression | Wu, Xin-Chuan; Di, Sheng; Cappello, Franck; Finkel, Hal; Alexeev, Yuri; Chong, Fred | In this work, we present our quantum circuit simulation by using lossy data compression. | Session 3: Algorithms and Architecture for Quantum Information |

38 | Low-depth parallelization of k-local gates and applications | O’Gorman, Bryan; Huggins, William; Rieffel, Eleanor; Whaley, Birgitta | We address this embedding problem for families of quantum circuits defined by a hypergraph where each hyperedge corresponds to a potential gate. | Session 3: Algorithms and Architecture for Quantum Information |

39 | Stationary Phase Method in Discrete Wigner Functions and Classical Simulation of Quantum Circuits | Kocia, Lucas; Love, Peter | We apply the periodized stationary phase method to discrete Wigner functions of systems with odd prime dimension using results from p-adic number theory. | Session 3: Algorithms and Architecture for Quantum Information |

40 | Quantum Simulation and Optimization in Hot Quantum Networks | Schuetz, Martin; Vermersch, Benoit; Kirchmair, Gerhard; Vandersypen, Lieven; Cirac, Juan; Lukin, Mikhail; Zoller, Peter | We propose and analyze a setup based on (solid-state) qubits coupled to a common multi-mode transmission line, which allows for coherent spin-spin interactions over macroscopic on-chip distances, without any ground-state cooling requirements for the data bus. | Session 3: Algorithms and Architecture for Quantum Information |

41 | Feedback-based simulation of quantum nonlinear dynamics: The Quantum Kicked Top in an ensemble of two-level atoms. | Muñoz-Arias, Manuel; Poggi, Pablo; Deutsch, Ivan | We study the implementation of a measurement-based feedback scheme to realize quantum nonlinear dynamics. | Session 3: Algorithms and Architecture for Quantum Information |

42 | Error-mitigated quantum computation with noisy superconducting qubits | Kandala, Abhinav | In this context, I shall introduce a zero-noise extrapolation technique [2,3] that enables access to noise-free estimates of expectation values, after the application of a short depth circuit, without requiring any additional quantum resources. | Session 4: Applications of Noisy Intermediate Scale Quantum Computers |

43 | A quantum computing algorithm for the investigation of the molecular excited states | Ollitrault, Pauline; Barkoutsos, Panagiotis; Woerner, Stefan; Tavernelli, Ivano | In this work, a perturbative approach is applied to the ground state wavefunction to derive a pseudo-eigenvalue problem, which size is characterized by a favorable scaling in the number of electrons. | Session 4: Applications of Noisy Intermediate Scale Quantum Computers |

44 | Error Mitigation in the Presence of Spatially Correlated Noise | Premakumar, Vickram; Ercan, Ekmel; Ghosh, Joydip; Friesen, Mark; Eriksson, Mark; Coppersmith, Susan; Joynt, Robert | We show how to improve quantum information processing for few-qubit systems when spatial correlations are present. | Session 4: Applications of Noisy Intermediate Scale Quantum Computers |

45 | Benchmarking error mitigation techniques on noisy quantum processors | Bisot, Corentin; Lilette, Emmanuel; Ayral, Thomas | Here, we present an implementation of a combination of these techniques, and a detailed benchmark based both on realistic noisy simulations and actual computations on current quantum architectures such as, for instance, superconducting transmon processors. | Session 4: Applications of Noisy Intermediate Scale Quantum Computers |

46 | Efficient scheduling of noise characterization protocols in quantum computing architectures | Gupta, Riddhi Swaroop; Biercuk, Michael | We present an algorithmic framework for 2D field mapping in quantum computing architectures using sparse measurements. | Session 4: Applications of Noisy Intermediate Scale Quantum Computers |

47 | Superfast encodings for fermionic quantum simulation | Setia, Kanav; Bravyi, Sergey; Mezzacapo, Antonio; Whitfield, James | We propose Generalized Superfast Encodings (GSE) which require the same number of qubits as the original one but have more favorable properties. | Session 4: Applications of Noisy Intermediate Scale Quantum Computers |

48 | Experimental Implementation of Quantum Circuit Born Machines in Near-Term Quantum Devices | Perdomo, Alejandro; Leyton-Ortega, Vicente; Perdomo, Oscar | In this talk, we will focus in the one of most challenging tasks for the machine learning community: the case of generative modeling in unsupervised machine learning. | Session 4: Applications of Noisy Intermediate Scale Quantum Computers |

49 | Simulations of Real Time Scattering in the 1D Quantum Ising Model | Gustafson, Erik; Meurice, Yannick; Unmuth-Yockey, Judah | We will discuss the results of quantum simulating a real time scattering event in the 1D Quantum Ising spin models using a quantum simulator. | Session 4: Applications of Noisy Intermediate Scale Quantum Computers |

50 | Quantum Local Search for Graph Community Detection | Shaydulin, Ruslan; Ushijima-Mwesigwa, Hayato; Safro, Ilya; Mniszewski, Susan; Alexeev, Yuri | We present Quantum Local Search (QLS) approach and demonstrate its efficacy by applying it to the problem of community detection in real-world networks. | Session 4: Applications of Noisy Intermediate Scale Quantum Computers |

51 | Marginals optimization procedure: algorithmically extending the capability of near-term quantum computers | Johnson, Peter; Radin, Max; Katabarwa, Amara; Romero, Jhonathan; Cao, Yudong | We describe the marginals optimization procedure for improving variational quantum algorithms and demonstrate its performance in simulations and small experiments. | Session 4: Applications of Noisy Intermediate Scale Quantum Computers |

52 | Reliable Analog Quantum Simulation and Quantum Complexity | Chinni, Karthik; Poggi, Pablo; Deutsch, Ivan | We study a “programmable” analog quantum simulator in the 16-dimensional Hilbert space based on optimal control of atomic spins in cesium [2], and study the basic paradigms such as the excited state quantum phase transitions [3] in the Lipkin-Meshkov-Glick (LMG) model [3]. | Session 4: Applications of Noisy Intermediate Scale Quantum Computers |

53 | Experimental Methods for Improving Heuristic Quantum Algorithms on NISQ Devices | Mitchell, Bradley; Naik, Ravi; Baek, Unpil; Dahlen, Dar; Kreikebaum, John Mark; O’Brien, Kevin; Ramasesh, Vinay; Blok, Machiel; Lavrijsen, Wim; Iancu, Costin; Siddiqi, Irfan | To this end, we employ techniques including using an expanded Hilbert space of the transmon as a computational space and performing Pauli twirling operations. | Session 4: Applications of Noisy Intermediate Scale Quantum Computers |

54 | State-of-the-art Classical Tools to Benchmark NISQ Devices | Mandra, Salvatore; Villalonga, Benjamin; Boixo, Sergio; Katzgraber, Helmut; Rieffel, Eleanor | In my talk, I will present some of our latest state-of-the-art classical tools to optimize classical cost functions (in collaboration with Texas A&M University), including numerical results on hard benchmark problem sets. | Session 4: Applications of Noisy Intermediate Scale Quantum Computers |

55 | Algorithm-Centric Error Mitigation | Younis, Ed; Lavrijsen, Wim; Sen, Koushik; Buluc, Aydin; Urbanek, Miroslav; De Jong, Wibe; Iancu, Costin | We derive algorithm-specific error mitigation procedures for VQE. | Session 4: Applications of Noisy Intermediate Scale Quantum Computers |

56 | Implementation of Grover’s quantum search algorithm with error mitigation at IBM Q computers | Wang, Yulun; Harrison, Robert; Krstic, Predrag | We have constructed the quantum circuits for implementation of the N=4 qubits Grover algorithm at IBM Q quantum computers. | Session 4: Applications of Noisy Intermediate Scale Quantum Computers |

57 | Fundamental limitations for measurements in quantum many-body systems | Barthel, Thomas; Lu, Jianfeng | We find that the time needed to realize a certain measurement to a predefined accuracy scales in general exponentially with the system size – posing a fundamental limitation. | Session 4: Applications of Noisy Intermediate Scale Quantum Computers |

58 | Postponing the orthogonality catastrophe: efficient state preparation for electronic structure simulations on quantum devices | Tubman, Norm; Mejuto Zaera, Carlos; Epstein, Jeffrey; Hait, Diptarka; Levine, Daniel; Huggins, William; Jiang, Zhang; McClean, Jarrod; Babbush, Ryan; Head-Gordon, Martin; Whaley, Birgitta | In this work we demonstrate that the adaptive sampling configuration interaction technique can be used to investigate the overlap issue. | Session 4: Applications of Noisy Intermediate Scale Quantum Computers |

59 | Testing, analysis, and refinement of the quantum Metropolis algorithm | Moussa, Jonathan | We present a revised quantum Metropolis algorithm that partially mitigates these drawbacks as evidenced by a combination of numerical experiments and theoretical analysis. | Session 4: Applications of Noisy Intermediate Scale Quantum Computers |

60 | Simulating strongly interacting fermionic systems in a quantum computer | Choquette-Poitevin, Alexandre; Barkoutsos, Panagiotis; Di Paolo, Agustin; Foley, Alexandre; Senechal, David; Tavernelli, Ivano; Blais, Alexandre | More precisely, we tackle the problem of a 1D lattice to study the Mott transition. | Session 4: Applications of Noisy Intermediate Scale Quantum Computers |

61 | End-to-end quantum chemistry simulations with reduced errors | Urbanek, Miroslav; Lavrijsen, Wim; De Jong, Wibe | We focus on the development of quantum chemistry algorithms running within the hybrid classical-quantum Variational Quantum Eigensolver (VQE) approach. | Session 4: Applications of Noisy Intermediate Scale Quantum Computers |

62 | Trotter Error Scaling with System Size in Quantum Simulations | Troyer, Matthias; Pearson, Natalie; Poulin, David | We show empirically that for local Hamiltonians the error for local observables and their correlation functions is independent of system size. | Session 4: Applications of Noisy Intermediate Scale Quantum Computers |

63 | Improved optimization algorithm for use in variational quantum eigensolvers | Morris, Titus | Here I present an algorithm that, at the cost of extra Pauli expectation values, allows for a faithful estimation of the parameter gradient of several classes of wavefunctions. | Session 4: Applications of Noisy Intermediate Scale Quantum Computers |

64 | Characterization of Training Circuits for Hybrid Quantum-Classical Algorithms | Sim, Sukin; Johnson, Peter; Aspuru-Guzik, Alan | In this work, we introduce several descriptors to characterize a set of parametrized circuits, including a measure of a circuit’s expressibility and how it correlates with algorithmic performance. | Session 4: Applications of Noisy Intermediate Scale Quantum Computers |

65 | Error mitigation by symmetry verification on a variational quantum eigensolver | Sagastizabal, Ramiro; Bonet-Monroig, Xavier; Singh, Malay; O’Brien, Thomas; Rol, Michiel Adriaan; Bultink, Cornelis Christiaan; Fu, Xiang; Muthusubramanian, Nandini; Bruno, Alessandro; DiCarlo, Leonardo | We present the implementation of our own low-cost error detection scheme, named symmetry verification (SV). | Session 4: Applications of Noisy Intermediate Scale Quantum Computers |

66 | Gate-efficient simulation of molecular eigenstates on a superconducting qubit quantum computer | Ganzhorn, Marc; Egger, Daniel; Ollitrault, Pauline; Barkoutsos, Panagiotis; Salis, Gian; Moll, Nikolaj; Fuhrer, Andreas; Mueller, Peter; Roth, Marco; Woerner, Stefan; Tavernelli, Ivano; Filipp, Stefan | We determine the energy spectrum of molecular hydrogen using a variational quantum eigensolver algorithm based on exchange-type gates in combination with a method from computational chemistry to compute the excited states. | Session 4: Applications of Noisy Intermediate Scale Quantum Computers |

67 | Improved variational algorithms for optimization problems in a quantum computer | Barkoutsos, Panagiotis; Robert, Anton; Nannicini, Giacomo; Tavernelli, Ivano; Woerner, Stefan | In this talk, we present results of the aforementioned scheme for a plethora of interesting optimization problems where we demonstrate faster convergence towards more accurate solutions. | Session 4: Applications of Noisy Intermediate Scale Quantum Computers |

68 | Variational Approaches for Quantum Simulation | Hsieh, Timothy; Ho, Wen Wei; Jonay, Cheryne | I will show how a variant of the Quantum Approximate Optimization Algorithm (QAOA), originally introduced as a variational approach for solving classical optimization problems, serves as an efficient and general approach for realizing non-trivial quantum states. | Session 4: Applications of Noisy Intermediate Scale Quantum Computers |

69 | Quantum gate-model approaches to exact and approximate optimization | Hadfield, Stuart | In particular, we consider the performance of the Quantum Approximate Optimization Algorithm on NP-hard optimization problems, and describe algorithm parameter setting strategies for real-world quantum hardware. | Session 4: Applications of Noisy Intermediate Scale Quantum Computers |

70 | Characterizing quantum circuits by short-cutting quantum errors and a unitary-dissipative ”polar” decomposition for quantum channels | Carignan-Dugas, Arnaud; Alexander, Matthew; Emerson, Joseph | In this work, we pave the way between partially characterized elementary operations and circuits thereof. | Session 4: Applications of Noisy Intermediate Scale Quantum Computers |

71 | Quantum Feedback Protocol for Approximating Single-Body Green’s Functions at Finite Temperature | Cohn, Jeffrey; Najafi, Khadijeh; Freericks, James; Jones, Barbara | We present a quantum feedback algorithm that aims to approximate single-body Green’s functions at finite temperature. | Session 4: Applications of Noisy Intermediate Scale Quantum Computers |

72 | Quantum simulation and Time-Dependent Density Functional Theory | Whitfield, James; Brown, James; Yang, Jun | Here we consider the application of quantum simulation to the problem of characterizing time-dependent Kohn-Sham potentials. | Session 4: Applications of Noisy Intermediate Scale Quantum Computers |

73 | Digital quantum simulation of a two-dimensional electron gas pierced by a strong magnetic field | Kaicher, Michael; Jäger, Simon; Wilhelm, Frank; Babbush, Ryan; Dallaire-Demers, Pierre-Luc | We give an ab-initio roadmap on how this system may be simulated on a quantum processor. | Session 4: Applications of Noisy Intermediate Scale Quantum Computers |

74 | Linear Depth Circuit Unitary Coupled Cluster Wavefunctions for Quantum Computation | Huggins, William; Lee, Joonho; Head-Gordon, Martin; Whaley, Birgitta | Motivated by the rapid development of quantum computing hardware we introduce a new unitary coupled cluster wavefunction ansatz for quantum chemistry which we call k-UpCCGSD. | Session 4: Applications of Noisy Intermediate Scale Quantum Computers |

75 | Quantum digital simulation of three toy models using IBM quantum hardware. | Cruz, Pedro; Gautier, Ronan; Catarina, Gonçalo; Fernandez-Rossier, Joaquin | In this talk we will present the results of our attempts to implement phase estimation algorithms to obtain the eigenvalues of 3 simple model Hamiltonians, using IBM quantum hardware. | Session 4: Applications of Noisy Intermediate Scale Quantum Computers |

76 | Implementing the Variational Quantum Eigensolver with native 2-qubit interaction and error mitigation | Tsunoda, Takahiro; Patterson, Andrew; Yuan, Xiao; Endo, Suguru; Rahamim, Joseph; Spring, Peter; Esposito, Martina; Jebari, Salha; Ratter, Kitti; Sosnina, Sophia; Tancredi, Giovanna; Vlastakis, Brian; Benjamin, Simon; Leek, Peter | In this presentation, we report a quantum chemistry simulation using the VQE on a 2-qubit superconducting device in which we use fixed frequency qubits and build the algorithm using the native 2-qubit interaction resulting from a static capacitive coupling. | Session 4: Applications of Noisy Intermediate Scale Quantum Computers |

77 | Tensorial tools for quantum computing | Meurice, Yannick | We discuss recent applications and FAQs about the tensor reformulations such as boundary conditions, Grassmann variables, Ward identities, effects of truncations and gauge invariance. | Session 4: Applications of Noisy Intermediate Scale Quantum Computers |

78 | How many qubits are needed for quantum computational supremacy? | Dalzell, Alexander; Harrow, Aram; Koh, Dax; La Placa, Rolando | Based on these conjectures we conclude that IQP circuits with 180 qubits, QAOA circuits with 360 qubits and boson sampling circuits (i.e. linear optical networks) with 90 photons are large enough for producing samples from their output distributions to be intractable on current technology. | Session 4: Applications of Noisy Intermediate Scale Quantum Computers |

79 | Verifying quantum supremacy by doubling the circuit depth | Datta, Animesh; Ferracin, Samuele; Kapourniotis, Theodoros | We present a verification protocol in the circuit model where the “desired” computation is verified running several independent “trap” computations, each of which requires (i) no more qubits than the desired computation and (ii) a circuit-depth twice that of the desired computation. | Session 4: Applications of Noisy Intermediate Scale Quantum Computers |

80 | Variational Quantum Factoring | Anschuetz, Eric; Olson, Jonathan; Aspuru-Guzik, Alan; Cao, Yudong | In this work, we revisit the problem of factoring, developing an alternative to Shor’s algorithm, which employs established techniques to map the factoring problem to the ground state of an Ising Hamiltonian. | Session 4: Applications of Noisy Intermediate Scale Quantum Computers |

81 | Variational quantum eigensolver of interacting bosons with NISQ devices | Li, Andy C. Y.; Macridin, Alexandru; Spentzouris, Panagiotis | In this work, we present a proof-of-principle experiment of a boson VQE algorithm implemented on Rigetti’s 8Q-device. | Session 4: Applications of Noisy Intermediate Scale Quantum Computers |

82 | A Quantum Algorithm for Symmetry-Exploitation in Exact Diagonalization of Quantum Many-Body Systems | Schmitz, Albert; Johri, Sonika | We discuss both the theory and full circuit implementation of Grover minimization as applied to this problem. | Session 4: Applications of Noisy Intermediate Scale Quantum Computers |

83 | Variational Quantum Optics | Di Paolo, Agustín; Barkoutsos, Panagiotis; Tavernelli, Ivano; Blais, Alexandre | In this talk, we extend the applicability of variational quantum algorithms to bosonic Hamiltonians with applications to quantum optics. | Session 4: Applications of Noisy Intermediate Scale Quantum Computers |

84 | Study network-related optimization problems using quantum alternating optimization ansatz | Wang, Zhihui; Adnane, Mustafa; Rieffel, Eleanor; O’Gorman, Bryan; Hadfield, Stuart; Mengoni, Riccardo; Venturelli, Davide | We present mappings for a few network optimization problems, including variants of finding the optimal spanning-tree or spanning-graph of a graph. | Session 4: Applications of Noisy Intermediate Scale Quantum Computers |

85 | Adiabatic Quantum Chemistry Simulations with Superconducting Qubits | Moll, Nikolaj; Salis, Gian; Ganzhorn, Marc; Egger, Daniel; Filipp, Stefan; Roth, Marco; Schmidt, Sebastian | We propose a scalable quantum simulator based on driven superconducting qubits where the interactions are generated parametrically by polychromatic magnetic flux modulation of a tunable bus element. | Session 4: Applications of Noisy Intermediate Scale Quantum Computers |

86 | Faster classical sampling from distributions defined by quantum circuits | Markov, Igor; Fatima, Aneeqa; Isakov, Sergei; Boixo, Sergio | In particular, we propose two new ways to trade circuit fidelity for computational speedups, so as to match the fidelity of a given quantum computer — a task previously thought impossible. | Session 4: Applications of Noisy Intermediate Scale Quantum Computers |

87 | Subspace-search variational quantum eigensolver for excited states | Nakanishi, Ken; Mitarai, Kosuke; Fujii, Keisuke | To extend the framework to excited states, we here propose an algorithm, the subspace-search variational quantum eigensolver (SSVQE). | Session 4: Applications of Noisy Intermediate Scale Quantum Computers |

88 | Holistic Error Mitigation Frameworks For Near-Term Computations | Dumitrescu, Eugen; Pooser, Raphael; McCaskey, Alexander; Morris, Titus; Lougovski, Pavel | We introduce an error mitigation framework consisting of routines built into a software stack aiming to return corrected data from programs run on NISQ devices. | Session 4: Applications of Noisy Intermediate Scale Quantum Computers |

89 | Quantum Kitchen Sinks: An algorithm for machine learning on near-term quantum computers | Wilson, Christopher; Otterbach, Johannes; Tezak, Nikolas; Smith, Robert; Karalekas, Peter; Polloreno, Anthony; Alam, Sohaib; Crooks, Gavin; Da Silva, Marcus | We describe a near-term quantum application for machine learning tasks by building upon the classical algorithm known as random kitchen sinks. | Session 4: Applications of Noisy Intermediate Scale Quantum Computers |

90 | Software and hardware for improved quantum volume of transmon processors | Bishop, Lev | In particular, we introduced a surprisingly effective circuit rewriting method for approximately decomposing arbitrary target two-qubit SU(4) gates while optimally trading off approximation error against the gate error. | Session 5: Characterization and Reduction of Noise in Quantum Computing Architectures |

91 | Investigating Crosstalk and Correlated Errors with Randomized Benchmarking on Multiple Qubits | Andersen, Christian Kraglund; Balasiu, Stefania; Heinsoo, Johannes; Remm, Ants; Krinner, Sebastian; Besse, Jean-Claude; Gasparinetti, Simone; Eichler, Christopher; Wallraff, Andreas | In this talk, we will present characterizations of cross-talk during gate operations using an extended simultaneous randomized benchmarking (RB) protocol. | Session 5: Characterization and Reduction of Noise in Quantum Computing Architectures |

92 | Pairwise Perturbative Ansatz for Quantum Process Tomography Part 1: Theory | Govia, Luke; Ribeill, Guilhem; Ware, Matthew; Krovi, Hari | To circumvent this, we present an ansatz to describe an arbitrary quantum process on a multi-qubit system that only requires characterization of two-qubit processes, such that the number of measurements scales only quadratically with the number of qubits. | Session 5: Characterization and Reduction of Noise in Quantum Computing Architectures |

93 | Pairwise Perturbative Ansatz for Quantum Process Tomography Part 2: Experiment | Ware, Matthew; Ribeill, Guilhem; Govia, Luke; Krovi, Hari | In part two of this talk we present a Pairwise Perturbative Ansatz (PAPA) reconstruction of a three qubit process. | Session 5: Characterization and Reduction of Noise in Quantum Computing Architectures |

94 | Two-qubit spectroscopy of spatiotemporally correlated noise in superconducting qubits. Part 1: theory | Beaudoin, Felix; Norris, Leigh; von Lüpke, Uwe; Sung, Youngkyu; Kjærgaard, Morten; Campbell, Daniel; Kim, David; Yoder, Jonilyn; Pop, Ioan-Mihai; Gustavsson, Simon; Oliver, William; Viola, Lorenza | In this talk, we present a generalization of this technique to two-qubit systems, enabling to simultaneously reconstruct the single-qubit and cross-correlation spectra of quantum dephasing noise. | Session 5: Characterization and Reduction of Noise in Quantum Computing Architectures |

95 | Two-qubit spectroscopy of spatiotemporally correlated noise in superconducting qubits. Part 2: experiment | Von Luepke, Uwe; Beaudoin, Felix; Norris, Leigh; Sung, Youngkyu; Kjærgaard, Morten; Campbell, Dan; Kim, David; Yoder, Jonilyn; Pop, Ioan-Mihai; Viola, Lorenza; Gustavsson, Simon; Oliver, William | In this work, we present experiments on correlated dephasing of two superconducting qubits due to photon shot noise in a shared microwave cavity. | Session 5: Characterization and Reduction of Noise in Quantum Computing Architectures |

96 | Suppressing error correlations in space and time using quantum control | Edmunds, Claire; Hempel, Cornelius; Harris, Robert; Ball, Harrison; Frey, Virginia; Stace, Thomas; Biercuk, Michael | We perform measurements of spatio-temporal error correlations in linear arrays of trapped ions. | Session 5: Characterization and Reduction of Noise in Quantum Computing Architectures |

97 | Randomized Benchmarking of Majorana Based Qubits | Tran, Alan; Bauer, Bela; Bonderson, Parsa; Flammia, Steven | In this work we adapt the framework of RB to MZM qubits with measurement-based gates and expand upon it by offering a protocol to directly characterize the fidelity of the underlying measurements themselves. | Session 5: Characterization and Reduction of Noise in Quantum Computing Architectures |

98 | Time-Resolved Tomography of Quantum Gates | Young, Kevin; Proctor, Timothy; Rudinger, Kenneth; Nielsen, Erik; Blume-Kohout, Robin | In this talk, we discuss a suite of quantum circuit experiments and data analysis tools that is capable of identifying and characterizing Fourier-sparse drift in quantum gates, measurements, and state preparation operations. | Session 5: Characterization and Reduction of Noise in Quantum Computing Architectures |

99 | Robust Decorrelation of Errors in Quantum Gates by Random Gate Synthesis | Polloreno, Anthony | In this talk, we discuss using robust optimal control techniques to construct many different implementations of a target gate, each with a different coherent error. | Session 5: Characterization and Reduction of Noise in Quantum Computing Architectures |

100 | 2019: A Hilbert Space Odyssey into the characterization of two-qubit gates using phase estimation | Gulshen, Kyle; Brown, Amy; Staley, Alexa; Peterson, Eric; Combes, Joshua | In this talk we present protocols that allow you to robustly tune up arbitrary two qubit gates with high accuracy. | Session 5: Characterization and Reduction of Noise in Quantum Computing Architectures |

101 | Calibration for single-qubit gates using robust phase estimation | Kirby, William; Kimmel, Shelby | In this talk we describe improved practical methods for quantifying such discrepancies using robust phase estimation, which requires only weak assumptions about the initial accuracies of the gate implementations. | Session 5: Characterization and Reduction of Noise in Quantum Computing Architectures |

102 | Calibrating two-qubit gates via robust phase estimation | Rudinger, Kenneth; Ribeill, Guilhem; Govia, Luke; Ware, Matthew; Kimmel, Shelby | We extend RPE for two qubits, showing that it may be used to learn the phase for any standard two-qubit gate (e.g., CNOT, CPHASE, Molmer-Sorensen, SWAP, cross-resonance, etc.). | Session 5: Characterization and Reduction of Noise in Quantum Computing Architectures |

103 | Spin–photon interface and spin-controlled photon switching in a nanobeam waveguide | Lodahl, Peter | Spin–photon interface and spin-controlled photon switching in a nanobeam waveguide | Session 6: Coherent Spins in Semiconductors |

104 | Off-Resonance Time-Resolved Kerr Rotation Spectroscopy | Noyan, Mehmet; Kikkawa, J. | We show that time-resolved Kerr rotation (TRKR) is a quantitatively accurate tool to measure spin dynamics, even when conducted highly off resonance. | Session 6: Coherent Spins in Semiconductors |

105 | Identification of multi-photon transitions between magnetic dipole states using electrically detected magnetic resonant excitation with variable drive-field helicities. | Nahlawi, Adnan; Malissa, Hans; Stoltzfus, Dani; Burn, Paul; Darwish, Tamim; Leung, Anna; Lupton, John; Boehme, Christoph | In order to study the latter, we built a radio frequency domain electron spin resonance setup which allows for driving fields with arbitrary polarization. | Session 6: Coherent Spins in Semiconductors |

106 | A charge-tunable quantum dot strongly coupled to a nanophotonic cavity | Luo, Zhouchen; Waks, Edo | Here, we report for the first time the realization of strong coupling between charge tunable QDs spin and a micro cavity, and the demonstration of spin population transfer via optical pumping. | Session 6: Coherent Spins in Semiconductors |

107 | Theory of the circulating current of a single magnetic impurity in a semiconductor | Rodrigues da Cruz, Adonai; Flatté, Michael | In this work we investigate the spin-orbit induced circulating current associated with the ground state of a single magnetic impurity in zincblende III-V semiconductor. | Session 6: Coherent Spins in Semiconductors |

108 | Polarization-to-spin conversion and entanglement distribution via coherent interface with semiconductor double quantum dot | Chang, Chien-Yuan; kuroyama, Kazuyuki; Larsson, Marcus; Matsuo, Sadashige; Fujita, Takafumi; Valentin, Sascha; Ludwig, Arne; Wieck, Andreas; Oiwa, Akira; Tarucha, Seigo | We report polarizationto-to-spin conversion implemented with single-shot readout of a single electron spin generated in a GaAs quantum dot. | Session 6: Coherent Spins in Semiconductors |

109 | Observation of magnetoresistance effect in charge pumping measurements | Anders, Mark; Lenahan, Patrick; Ryan, Jason | We report on a new magnetoresistance effect based on spin dependent trapping events at MOSFET gate/substrate interfaces called near zero field spin dependent charge pumping (NZF SDCP). | Session 6: Coherent Spins in Semiconductors |

110 | Electrically Detected Magnetic Resonance in Silicon Nitride Thin Films of Widely Varying Stoichiometries | Waskiewicz, Ryan; Frantz, Elias; Lenahan, Patrick; King, Sean | We utilize electrically detected magnetic resonance (EDMR) to identify defects responsible for electronic transport in thin films of silicon nitride. | Session 6: Coherent Spins in Semiconductors |

111 | Electrically Detected Magnetic Resonance Study of 4H-SiC/SiO2 Transistors with Barium Passivation | Ashton, James; Lenahan, Patrick; Lichtenwalner, Daniel; Lelis, Aivars; Anders, Mark | We report on electrically detected magnetic resonance measurements on 4H-SiC/SiO 2 metal oxide semiconductor field effect transistors. | Session 6: Coherent Spins in Semiconductors |

112 | Embedded quantum dots in (Ga, Al)As semiconductor nanostructure: structural study of current tunneling | Paredes, Harold; Perez, Servio | We report the tunneling current behavior in a nano-semiconductor structure of (Ga, Al) As / GaAs, which contains the Rashba spin orbital interaction in the presence of embedded InAs quantum dots of different geometries (lens, pyramid and ring) depending on the voltage, magnetic field, and different spin-orbit interaction values K gL=?/4, ?/2, 3?/4. | Session 6: Coherent Spins in Semiconductors |

113 | Zeeman-type spin splitting in non-magnetic three-dimensional compounds: Material prediction and electrical control | Mera Acosta, Carlos; Fazzio, Adalberto; Dalpian, Gustavo | Using these conditions as filters, we perform a material screening and high-throughput ab-initio calculations to systematically search for these materials in the ICSD database. | Session 6: Coherent Spins in Semiconductors |

114 | DETECTION OF STRONG MAGNETIC RESONANT DRIVE EFFECTS USING SPIN-DEPENDENT ELECTRONIC TRANSITION RATES IN ORGANIC SEMICONDUCTOR MATERIALS | Jamali, Shirin; Malissa, Hans; Stoltzfus, Dani; Burn, Paul; Darwish, Tamim; Leung, Anna; Lupton, John; Boehme, Christoph | We have used this effect to study magnetic resonance in the strong driving regime when the amplitude of the driving field B 1 ~ B 0. | Session 6: Coherent Spins in Semiconductors |

115 | Looking for new layered ferromagnetic semiconductor | Kong, Tai; Stolze, Karoline; Tao, Jing; Ni, Danrui; Cava, Robert | In this talk, we will show our recent effort in looking for new compounds under this category and report the discovery of a new layered ferromagnetic semiconductor with a van der Waals gap. | Session 6: Coherent Spins in Semiconductors |

116 | True machine learning for quantum dot tune-up | Zwolak, Justyna; Taylor, Jacob; Kalantre, Sandesh; Wu, Xingyao | In particular, we demonstrated that deep convolutional neural networks (CNNs) can be used to characterize the state of single and double quantum dots based on measurements of a current-gate voltage transport characteristics or via the conductance of a nearby charge sensor [1,2]. | Session 7: Computer-aided Tune-up and Calibration of Semiconductor Qubits |

117 | Computer-assisted quantum dot tuning for quantum computation and simulation | Vandersypen, Lieven | I will present our past and present tuning efforts and summarize recent physics experiments on 2×2 and 8×1 quantum dot arrays that are enabled by these tuning methods. | Session 7: Computer-aided Tune-up and Calibration of Semiconductor Qubits |

118 | Automated Tuning of Tunnel Couplings and Gate Operations for Semiconductor Spin Qubits | Cerfontaine, Pascal; Teske, Julian David; Otten, Rene; Humpohl, Simon; Wolfe, Michael; Bethke, Patrick; Bluhm, Hendrik | To address this challenge we present an iterative machine-learning algorithm [2] for automated fine-tuning of quantum dots. | Session 7: Computer-aided Tune-up and Calibration of Semiconductor Qubits |

119 | Strategies for Automated Tune-up of Quantum Dot Arrays | Meenehan, Seán | In this talk we describe an automated process, based on single-dot measurements, simple image analysis, and linear compensation modeling of the device, which enables estimation of arbitrary charge states for a multi-dot system. | Session 7: Computer-aided Tune-up and Calibration of Semiconductor Qubits |

120 | Efficiently measuring and tuning quantum devices using machine learning | Ares, Natalia | I will present efficient measurements on a single quantum dot performed by a machine learning algorithm. | Session 7: Computer-aided Tune-up and Calibration of Semiconductor Qubits |

121 | DQI Business Meeting | DQI Business Meeting | Session 8: DQI Business Meeting | |

122 | Linking trapped-ion quantum nodes | Northup, Tracy | I will present ongoing work to transfer photonic quantum states between two remote trapped-ion systems, highlighting the experimental challenges and identifying the key components for scaling up such links into networks. | Session 9: Distributed Quantum Computation, Networking and Information Security |

123 | Diamond quantum networks for distributed quantum computation | Taminiau, Tim Hugo | In this talk I will present our recent experimental progress towards quantum networks for distributed quantum computations and argue that we are getting close to the point where imperfections can be overcome by quantum error correction, so that logical qubits encoded over the network become increasingly more stable as the network is made increasingly larger. | Session 9: Distributed Quantum Computation, Networking and Information Security |

124 | Distributed Quantum Computing Architectures | Suchara, Martin; Alexeev, Yuri; Chung Miranda, Joaquin; Kettimuthu, Rajkumar | We compare the suitability of these techniques for various quantum circuits, describe optimizations that enable mapping quantum circuits into sub-circuits, and compare the hardware requirements of the two approaches. | Session 9: Distributed Quantum Computation, Networking and Information Security |

125 | Numerical finite-key analysis of quantum key distribution | Bunandar, Darius; Englund, Dirk | To circumvent this problem, we have developed an efficient numerical approach to calculate the secret key rates of any QKD protocol. | Session 9: Distributed Quantum Computation, Networking and Information Security |

126 | Distributed Routing in a Quantum Internet | Chakraborty, Kaushik; Dahlberg, Axel; Rozpedek, Filip; Wehner, Stephanie | In this article we study distribution of entanglement in advance in a network vs producing it on demand. | Session 9: Distributed Quantum Computation, Networking and Information Security |

127 | Quantum Network Simulations | Chung Miranda, Joaquin; Kettimuthu, Rajkumar; Suchara, Martin; Alexeev, Yuri | Our work focuses on developing quantum network simulators at various network layers ranging from the physical layer to applications. | Session 9: Distributed Quantum Computation, Networking and Information Security |

128 | Anonymous transmission in a noisy quantum network using the W state | Lipinska, Victoria; Murta, Gláucia; Wehner, Stephanie | We present a protocol that accomplishes this task using the W state. | Session 9: Distributed Quantum Computation, Networking and Information Security |

129 | Towards a multi-node network with NV centres in diamond | Pompili, Matteo; Hermans, Sophie; Beukers, Hans; van Es, Romy; Baier, Simon; Hanson, Ronald | We present our recent progress on the ongoing effort to generate genuine multipartite entanglement between three distant NV centres, as we overcome the obstacles to move beyond two node networks. | Session 9: Distributed Quantum Computation, Networking and Information Security |

130 | Cavity enhanced spin-photon interaction for a diamond based quantum network | Weaver, Matthew; Ruf, Maximilian; Sager La Ganga, Santi; Van Dam, Suzanne; Evers, Guus; Eschen, Martin; de Jong, Nick; van den Berg, Hans; Flipse, Jasper; Hanson, Ronald | We construct high finesse fiber based cavities with a microns thick diamond membrane and measure the NV cavity interaction. | Session 9: Distributed Quantum Computation, Networking and Information Security |

131 | Impact of qubit connectivity on quantum algorithm performance | Holmes, Adam; Johri, Sonika; Guerreschi, Gian; Clarke, Jim; Matsuura, Anne | Here we map and schedule representative algorithmic workloads – the Quantum Fourier Transform (QFT) relevant to factoring, the Grover diffusion operator relevant to quantum search, and Jordan-Wigner parity rotations relevant to simulations of quantum chemistry and materials science – to qubit arrays with varying connectivity. | Session 9: Distributed Quantum Computation, Networking and Information Security |

132 | Time-bin and Polarization Superdense Teleportation for Space Applications | Chapman, Joseph; Graham, Trent; Zeitler, Christopher; Kwiat, Paul | We have constructed a system that generates hyperentangled photonic “ququarts” and measures them to execute multiple quantum communication protocols of interest. | Session 9: Distributed Quantum Computation, Networking and Information Security |

133 | Simulation of a 1025-node quantum repeater chain of NV centres with NetSquid, a new discrete-event quantum-network simulator | Coopmans, Tim; Dahlberg, Axel; Skrzypczyk, Matthew; Rozpedek, Filip; ter Hoeven, Roeland; Wubben, Leon; Knegjens, Rob; de Oliveira Filho, Julio; Elkouss, David; Wehner, Stephanie | In particular, we analyse the sensitivity of hardware parameters on the performance of the entire repeater chain. For these simulations, we have developed a generic quantum-network discrete-event simulator called NetSquid, which is capable of simulating decoherence together with imperfect quantum-state operations and stochastic feedback loops. | Session 9: Distributed Quantum Computation, Networking and Information Security |

134 | Entanglement cost of quantum state preparation and channel simulation | Wang, Xin; Wilde, Mark | We study various aspects of the entanglement cost of quantum state preparation and quantum channel simulation. | Session 9: Distributed Quantum Computation, Networking and Information Security |

135 | Communicating via Ignorance | GOSWAMI, KAUMUDIBIKASH; Romero, Jacquiline; White, Andrew | We experimentally demonstrate this counterintuitive result in a quantum switch that uses polarisation to coherently control the order of two depolarising channels acting on the transverse spatial mode of a photon. | Session 9: Distributed Quantum Computation, Networking and Information Security |

136 | Quantum Link Prediction in Complex Networks | Omar, Yasser; Moutinho, João; Melo, André; Coutinho, Bruno; Kovacs, Istvan; Barabasi, Albert | In this work we present a novel method for link prediction in complex networks based on continuous-time quantum walks. | Session 9: Distributed Quantum Computation, Networking and Information Security |

137 | Indefinite Causal Order | Romero, Jacquiline; Goswami, Kaumudikash; Giarmatzi, Christina; Kewming, Michael; Costa, Fabio; Branciard, Cyril; White, Andrew | We confirm our quantum switch has no definite causal order by constructing a causal witness and measuring its value to be 18 standard deviations beyond the definite-order bound. | Session 9: Distributed Quantum Computation, Networking and Information Security |

138 | Counterfactual Quantum Superdense Coding | Zaman, Fakhar; Jeong, Youngmin; Shin, Hyundong | In this article, we present a counterfactual QSC scheme that enables remote parties to accomplish this task without prior entanglement but no physical particle is found in the transmission channel. | Session 9: Distributed Quantum Computation, Networking and Information Security |

139 | Drone-based Quantum Key Distribution | Conrad, Andrew; Chaffee, Dalton; Chapman, Joseph; Chopp, Chris; Herdon, Kyle; Hill, Alexander; Sanchez-Rosales, Daniel; Szabo, Joseph; Gauthier, Daniel; Kwiat, Paul | Here we discuss our current progress in developing a reconfigurable network of two or more small multi-rotor drones implementing a modified BB84 quantum key distribution protocol over a free-space optical channel. | Session 9: Distributed Quantum Computation, Networking and Information Security |

140 | Quantum Internet Applications | Kaplan, Marc | We will review some of these settings, and the main techniques used to make the protocols secure. | Session 9: Distributed Quantum Computation, Networking and Information Security |

141 | Quantum-Assisted Telescope Arrays | Khabiboulline, Emil; Borregaard, Johannes; De Greve, Kristiaan; Lukin, Mikhail | We present a protocol with efficient use of quantum resources and modest quantum memories. | Session 9: Distributed Quantum Computation, Networking and Information Security |

142 | Long distance measurement-device-independent quantum key distribution without reference calibration | Liu, Hong-Wei; Wang, Ji-Peng; Ma, Hai-Qiang; Sun, Shi-Hai | Herein, in an asymptotic case, we report the results of RFI-MDI-QKD over a distance of 160 km at a clock rate of 50 MHz. | Session 9: Distributed Quantum Computation, Networking and Information Security |

143 | Entangled-pulse generation inside coherent Ising machines using entanglement swapping | Yanagimoto, Ryotatsu; McMahon, Peter; Onodera, Tatsuhiro; Ng, Edwin; Mabuchi, Hideo | In this research, we investigate the use of entanglement swapping to introduce inter-pulse entanglement into such CIM-like architectures, using an external source of independently squeezed pulses. | Session 9: Distributed Quantum Computation, Networking and Information Security |

144 | Maximal LELM Distinguishability of Qubit and Qutrit Bell States using Projective and Non-Projective Measurements | Leslie, Nathaniel; Devin, Julien; Lynn, Theresa | We present newly-established maximum distinguishability bounds for the qutrit Bell states of bosons via projective LELM measurements; only three of the nine Bell states can be distinguished. | Session 9: Distributed Quantum Computation, Networking and Information Security |

145 | Generating accessible entanglement in bosons via pair-correlated tunneling | Volkoff, Tyler; Herdman, Chris | We propose a low complexity variational subspace for the ground state of the system in the pair-correlated regime, which we find to be numerically exact in pure pair-tunneling limit. | Session 9: Distributed Quantum Computation, Networking and Information Security |

146 | Observation of the parity-time symmetry breaking transition in a dissipative superconducting qubit | Naghiloo, Mahdi; Abbasi, Maryam; Joglekar, Yogesh; Murch, Kater | We employ bath engineering techniques to realize a non-Hermitian Hamiltonian that has effective PT symmetry for a superconducting circuit. | Session 10: Driven and Dissipative Superconducting Circuits |

147 | An experimental implementation for stabilizing Schrödinger cat states in a Kerr nonlinear resonator – Basic concepts | Frattini, Nicholas; Grimm, Alexander; Mundhada, Shantanu; Puri, Shruti; Touzard, Steven; Mirrahimi, Mazyar | In this talk, we will give an introduction on this type of qubit and its potential uses in quantum computation before discussing an experimental implementation. | Session 10: Driven and Dissipative Superconducting Circuits |

148 | An experimental implementation for stabilizing Schrödinger cat states in a Kerr non-linear resonator – Part 2: Experiment. | Grimm, Alexander; Frattini, Nicholas; Mundhada, Shantanu; Puri, Shruti; Touzard, Steven; Mirrahimi, Mazyar; Shankar, Shyam; Devoret, Michel | Instead of a Josephson junction, we use a Superconducting Nonlinear Asymmetric Inductive eLement (SNAIL) providing us with both three- and four-wave-mixing terms. | Session 10: Driven and Dissipative Superconducting Circuits |

149 | Directional Quantum State Transfer by Dissipation I – Conceptual Overview | Wang, Chen; Gertler, Jeffrey | Here, breaking reciprocity by dissipation in an open system, we propose a type of cascaded quantum systems where a quantum state can be spontaneously transferred between stationary qubits without time-dependent control. | Session 10: Driven and Dissipative Superconducting Circuits |

150 | Directional Quantum State Transfer by Dissipation II – Implementation in Circuit QED | Gertler, Jeffrey; Wang, Chen; Deng, Xiaowei | Here we utilize dissipation to implement an autonomous technique for quantum state transfer, with built-in directionality, that eliminates the need for time dependent external control. | Session 10: Driven and Dissipative Superconducting Circuits |

151 | Reconstructing Josephson Current-Phase Relations with Intermodulation Spectroscopy | Jolin, Shan; Weißl, Thomas; Borgani, Riccardo; Haviland, David | We present a method based on matrix inversion to reconstruct the nonlinearity from a measurement of this comb [1, 2]. | Session 10: Driven and Dissipative Superconducting Circuits |

152 | Dissipation-free non-Hermitian physics using quantum parametric amplifiers | Wang, Yuxin; Clerk, Aashish | Here, we show that many of these non-Hermitian effects can be realized in a completely non-dissipative setting, by exact unitary mappings to parametrically-driven bosonic setups. | Session 10: Driven and Dissipative Superconducting Circuits |

153 | Driven Kerr resonators: new regimes of solvability and quantum bistability | Roberts, David; Clerk, Aashish | Here, we develop a more physically transparent method for finding analytic solutions to driven Kerr resonators. | Session 10: Driven and Dissipative Superconducting Circuits |

154 | Suppressing the instabilities of the RF driven transmon by a kinetic inductive shunt – Part 1: Motivation and modelization | Venkatraman, Jayameenakshi; Xiao, Xu; Smith, Clarke; Leghtas, Zaki; Verney, Lucas; Mirrahimi, Mazyar; Shankar, Shyam; Pop, Ioan-Mihai; Devoret, Michel | Suppressing the instabilities of the RF driven transmon by a kinetic inductive shunt – Part 1: Motivation and modelization | Session 10: Driven and Dissipative Superconducting Circuits |

155 | Quantum Electrodynamic Modeling of Superconducting Circuits | Tureci, Hakan | I will discuss a computational framework based on the Heisenberg-Langevin approach to address these fundamental questions. | Session 10: Driven and Dissipative Superconducting Circuits |

156 | Suppressing the instabilities of RF driven transmon by a kinetic inductive shunt – Part 2: Experimental results | Xiao, Xu; Venkatraman, Jayameenakshi; Smith, Clarke; Leghtas, Zaki; Verney, Lucas; Mirrahimi, Mazyar; Shankar, Shyam; Pop, Ioan-Mihai; Devoret, Michel | Suppressing the instabilities of RF driven transmon by a kinetic inductive shunt – Part 2: Experimental results | Session 10: Driven and Dissipative Superconducting Circuits |

157 | Bistability and Critical Slowing Down in Superconducting Circuits | Brookes, Paul; Tancredi, Giovanna; Mavrogordatos, Themis; Patterson, Andrew; Rahamim, Joseph; Esposito, Martina; Leek, Peter; Ginossar, Eran; Szymanska, Marzena | We observe that this equilibration time saturates at high drive powers. | Session 10: Driven and Dissipative Superconducting Circuits |

158 | Measurement of the Crossover from Photon Ordering to Delocalization in a Driven-Dissipative Superconducting Resonator System | Collodo, Michele; Potocnik, Anton; Gasparinetti, Simone; Besse, Jean-Claude; Pechal, Marek; Sameti, Mahdi; Hartmann, Michael; Wallraff, Andreas; Eichler, Christopher | We present a system composed of two superconducting resonators, coupled nonlinearly by a superconducting quantum interference device (SQUID). | Session 10: Driven and Dissipative Superconducting Circuits |

159 | Spin qubits made of quantum dots and donors in silicon | Harvey-Collard, Patrick | In this talk, I will present our recent work on control and readout of electron spin qubits in silicon MOS.. | Session 11: Exchange-Based Spin Qubits |

160 | Decoherence of a donor-dot hybrid qubit in Si | Truong, John; Hu, Xuedong | We study the decoherence properties of the flip-flop qubit when positioned near this sweet spot. | Session 11: Exchange-Based Spin Qubits |

161 | Probing exchange interaction for gate-defined double quantum dots | Bethke, Patrick; Wolfe, Michael; McNeil, Robert; Ludwig, Arne; Wieck, Andreas; Bluhm, Hendrik | We present measurements of J down to values below 1MHz by controlling the nuclear magnetic field gradient ? B z in a GaAs double quantum dot. | Session 11: Exchange-Based Spin Qubits |

162 | Computational modeling of exchange splitting in Si/SiO2 double quantum dots | Sahasrabudhe, Harshad; Rahman, Rajib | We present a computational study of Si/SiO 2 based double quantum dot qubits which could help in scaling the device design. | Session 11: Exchange-Based Spin Qubits |

163 | Achieving A High Fidelity Controlled-NOT Gate Between A Pair Of Exchanged-Coupled Silicon Double-Quantum-Dot Hybrid Qubits | Yang, Yuan-Chi; Friesen, Mark; Coppersmith, Susan | Here we show that, in a pair of exchange-coupled double-quantum-dot hybrid qubits, it is possible to exploit the large-detuning regime to achieve a sizeable exchange interaction between the qubits while suppressing leakage and dephasing, yielding a high-fidelity controlled phase gate with a gate time less than 1 ns. | Session 11: Exchange-Based Spin Qubits |

164 | Quadrupolar exchange-only spin qubit | Russ, Maximilian; Petta, Jason; Burkard, Guido | We propose a quadrupolar exchange-only (QUEX) spin qubit that is highly robust against charge noise and nuclear spin dephasing, the dominant decoherence mechanisms in quantum dots [1]. | Session 11: Exchange-Based Spin Qubits |

165 | Strong Microwave Photon Coupling to the Electron Quadrupole Moment | Koski, Jonne; Landig, Andreas; Scarlino, Pasquale; Russ, Maximilian; Van Woerkom, David; Reichl, Christian; Wegscheider, Werner; Burkard, Guido; Wallraff, Andreas; Ihn, Thomas; Ensslin, Klaus | We demonstrate strong quadrupole qubit-photon coupling with a qubit-photon coupling strength of g / 2 ? ? 130 MHz and a qubit decoherence rate of ? 2 / 2 ? ? 30 MHz. | Session 11: Exchange-Based Spin Qubits |

166 | Suppression of Leakage for a Charge Quadrupole Qubit in Triangular Geometry | Chan, Guo Xuan; Wang, Xin | We propose a strategy to mitigate such destructive coupling by simply implementing the CQ qubit in a triangular triple quantum dot, where the tunneling between the two dots on the edge strongly suppresses leakage, eliminating the need of complex pulse sequences. | Session 11: Exchange-Based Spin Qubits |

167 | A High-Fidelity Gateset for Exchange-Coupled Singlet-Triplet Qubits | Otten, Rene; Cerfontaine, Pascal; Wolfe, Michael; Bluhm, Hendrik | We obtain fidelities of 99.9% for GaAs, while about 99.99% are achieved with vanishing magnetic field noise as in Si. | Session 11: Exchange-Based Spin Qubits |

168 | Fast high-fidelity entangling gates in Si double quantum dots | Calderon-Vargas, Fernando; Barron, George; Deng, Xiuhao; Barnes, Edwin; Economou, Sophia | Here we show that, by using simple smooth pulses to control the amplitude of the oscillating magnetic field, entangling gates locally equivalent to control-NOT and control-Z gates can be implemented in times as low as 26 ns and with fidelities up to 99.99%. | Session 11: Exchange-Based Spin Qubits |

169 | Robust implementation of one-qubit gates despite always-on exchange coupling in silicon double quantum dots | Gungordu, Utkan; Kestner, Jason | Here we show that, even in the presence of an exchange coupling stronger than one-qubit Rabi frequencies, spins can be addressed separately to implement a particular class of one-qubit gates optionally surrounded by exchange gates, and the crosstalk between them can be eliminated stroboscopically. | Session 11: Exchange-Based Spin Qubits |

170 | Adiabatic two-qubit gates of capacitively coupled quantum dot hybrid qubits | Frees, Adam; Gamble, John; Friesen, Mark; Coppersmith, Susan | Here, we model a system consisting of two capacitively-coupled quantum dot hybrid qubits, and optimize the adiabatic electrical pulses used to entangle these qubits. | Session 11: Exchange-Based Spin Qubits |

171 | Minimal non-orthogonal gate decomposition for qubits with limited control | Zhang, Xiaoming; Li, Jianan; Wang, Xin; Yung, Man-Hong | Here, we consider two important scenarios. The first one is when rotation axes are allowed to vary in a range of a plane, which corresponds to the Singlet-Triplet (ST) qubit in quantum-dot systems; the second one is when rotation axes can only along two fixed directions, corresponding to the Exchange-Only (EO) qubits. | Session 11: Exchange-Based Spin Qubits |

172 | Characterization of Single- and Two-qubit Gates between Transmons and Capacitively Shunted Flux Qubits | Ku, Jaseung; Liu, Yebin; Plourde, Britton; Xu, Xuexin; Ansari, Mohammad; Hertzberg, Jared; Brink, Markus; Chow, Jerry | In this talk, we will present experimental results from these measurements. | Session 12: Gates in Superconducting Qubits |

173 | Characterization of Single- and Two-qubit Gates between Transmons and Capacitively Shunted Flux Qubits: Part 2, Theory | Xu, Xuexin; Ansari, Mohammad; Ku, Jaseung; Liu, Yebin; Plourde, Britton; Hertzberg, Jared; Brink, Markus; Chow, Jerry | To model this circuit we take into account the contribution of higher excited states in qubits and block-diagonalize the Hamiltonian perturbatively in the regime of small interaction couplings compared to frequency detuning. | Session 12: Gates in Superconducting Qubits |

174 | Demonstration of a high fidelity entangling gate in a superconducting architecture | Hong, Sabrina; Sivarajah, Prasahnt; Polloreno, Anthony; Didier, Nicolas; Sete, Eyob; Combes, Joshua; Gulshen, Kyle; Da Silva, Marcus; Papageorge, Alexander | We demonstrate a high fidelity entangling gate in an architecture of alternating fixed and tunable qubits by directly modulating the flux of the tunable qubit. | Session 12: Gates in Superconducting Qubits |

175 | Quantum Gates between Multi-modal Quantum Circuits | Hazra, Sumeru; Salunkhe, Kishor; Bothara, Gaurav; Bhattacharjee, Anirban; Kundu, Suman; Patankar, Meghan; Roy, Tanay; Vijayaraghavan, Rajamani | In order to scale up, we propose to use the trimon as a building block for a larger quantum processor using cross resonance drive[4] to turn on interaction between two such units. We will present preliminary experimental data and discuss extensions to gates between multiple dimon/trimon blocks. | Session 12: Gates in Superconducting Qubits |

176 | Fast single qubit gates in a capacitively shunted fluxonium | Zhang, Helin | Here, we present and characterize new protocols for performing fast single-qubit gates near half flux quantum, using fast flux modulation. | Session 12: Gates in Superconducting Qubits |

177 | Sub-100ns entangling gates between two strongly coupled transmon qubits | Long, Junling; Ku, Hsiang-Sheng; Lake, Russell; Wu, Xian; Bal, Mustafa; McRae, Corey Rae; Pappas, David | In this talk, we demonstrate a new type of two-qubit entangling gate, the SWIPHT gate [1], on a coupled-transmon device. | Session 12: Gates in Superconducting Qubits |

178 | Black-box optimization of quantum gates for two coupled transmons | Leng, Zhaoqi; Mundada, Pranav; Houck, Andrew | Here, we present simulated and experimental results on using black-box optimization to tune up quantum gates for two transmon qubits coupled via a bus cavity. | Session 12: Gates in Superconducting Qubits |

179 | High fidelity fermionic simulation gates with superconducting gmon qubits | Foxen, Brooks; Chiaro, Ben; McEwen, Matthew; Martinis, John | We present an experimental realization of a high-fidelity 2-qubit continuous fermionic simulation (fSim) gateset using superconducting gmon qubits. | Session 12: Gates in Superconducting Qubits |

180 | Experimental Realization of non-Adiabatic Shortcut to non-Abelian Geometric Gates | Yan, Tongxing; Liu, Baojie; Xu, Kai; Song, Chao; Liu, Song; Zhang, Zhensheng; Deng, Hui; Yan, Zhiguang; Rong, Hao; Huang, Keqiang; Yung, Man-Hong; Chen, Yuanzhen; Yu, Dapeng | Here we propose and experimentally demonstrate that HQC via shortcut to adiabaticity (STA) can be constructed with only three energy levels, using a superconducting qubit. | Session 12: Gates in Superconducting Qubits |

181 | High-fidelity parametric entangling gates at AC flux sweet spots | Didier, Nicolas; Sete, Eyob; Combes, Joshua; Da Silva, Marcus | We present how the AC flux sweet spot allows to reach state-of-the-art fidelities in parametrically-activated entangling gates. | Session 12: Gates in Superconducting Qubits |

182 | Coherent, Landau-Zener control of a superconducting composite qubit | Campbell, Daniel; Kannan, Bharath; Shim, Yun-Pil; Winik, Roni; Melville, Alexander; Niedzielski, Bethany; Yoder, Jonilyn; Tahan, Charles; Orlando, Terry; Gustavsson, Simon; Oliver, William | We present these experimental demonstrations and discuss the susceptibility of the CQB to various noise channels. | Session 12: Gates in Superconducting Qubits |

183 | Fault-tolerant and Continuous Holonomic Gates for Topologically Protected Qubits. | Klots, Andrey; Faoro, Lara; McDermott, Robert; Ioffe, Lev | We present the design of the topologically protected qubit that allows fault tolerant discrete operations together with the continuous holonomic exp( i??z)-gates. | Session 12: Gates in Superconducting Qubits |

184 | Fundamental limits to quantum channel discrimination | Pirandola, Stefano; Laurenza, Riccardo; Lupo, Cosmo | Here we address this basic question by deriving a general and fundamental lower bound. | Session 13: General Quantum Information and Quantum Computation |

185 | Quantum Dimension Witness and Assisted Quantum State Discrimination | Khalid, Uman; Jeong, Youngmin; Shin, Hyundong | Based on the aforementioned measurement scenario, we present a quantitative measure that is both the QDW and MbQC measure for arbitrary dimensional bipartite quantum systems. | Session 13: General Quantum Information and Quantum Computation |

186 | Fidelity estimation via local measurements in the presence of arbitrarily correlated noise | Ruan, Liangzhong; Wehner, Stephanie | This work addresses these two challenges, designs a protocol for estimating the average fidelity of qubit pairs shared by remote agents, whose efficiency reaches the fundamental upper bound achievable with local operations, and characterizes the performance of the proposed protocol in the presence of arbitrary noise. | Session 13: General Quantum Information and Quantum Computation |

187 | Effective Hamiltonian theory of the geometric evolution of quantum systems | Shkolnykov, Vladyslav; Burkard, Guido | We present an effective Hamiltonian description of the quantum dynamics of a generalized Lambda system undergoing adiabatic evolution [1]. | Session 13: General Quantum Information and Quantum Computation |

188 | Dense Measurements for Gate-Model Quantum Computers | Gyongyosi, Laszlo; Imre, Sandor | Here, we define a novel measurement for gate-model quantum computers called dense quantum measurement. | Session 13: General Quantum Information and Quantum Computation |

189 | Why the Quantum | Stuckey, William | We show that the quantum correlations resulting from two Bell basis states, which uniquely produce the Tsirelson bound for the Clauser-Horne-Shimony-Holt quantity, can be derived from the conservation of angular momentum (on average) for the quantum exchange of momentum. | Session 13: General Quantum Information and Quantum Computation |

190 | Wavefunction; The Guided Energy of Wave | Ademola, Desmond Agbolade | The fundamental analysis presented in this work show that mathematical formalism of wavefunction was wrongly formulated. | Session 13: General Quantum Information and Quantum Computation |

191 | Quaternion Series Spin | Sweetser, Douglas | Quaternion Series Spin | Session 13: General Quantum Information and Quantum Computation |

192 | Entropic Energy-Time Uncertainty Relation | Coles, Patrick; Katariya, Vishal; Lloyd, Seth; Marvian, Iman; Wilde, Mark | Our main result is an entropic energy-time uncertainty relation for general time-independent Hamiltonians, stated for both the discrete-time and continuous-time cases. | Session 13: General Quantum Information and Quantum Computation |

193 | Duality and free energy analyticity bounds for few-body Ising models with extensive homology rank | Jiang, Yi; Dumer, Ilya; Kovalev, Alexey; Pryadko, Leonid | We consider pairs of few-body Ising models such that each model can be obtained from the dual of the other after freezing k spins on large-degree sites. | Session 13: General Quantum Information and Quantum Computation |

194 | Complexity phase transition in interacting and long-range bosonic Hamiltonians | Maskara, Nishad; Deshpande, Abhinav; Tran, Cong Minh; Fefferman, Bill; Foss-Feig, Michael; Gorshkov, Alexey | Along the way, we develop methods and tools that are of independent interest. | Session 13: General Quantum Information and Quantum Computation |

195 | Unitary designs for continuous variable systems | Schuster, Thomas; Zhuang, Quntao; Yoshida, Beni; Yao, Norman | Extending further, we show that unitary 4-designs maximize the phase space volume of generic time-evolved operators. | Session 13: General Quantum Information and Quantum Computation |

196 | Scrambling and complexity in phase space | Zhuang, Quntao; Schuster, Thomas; Yoshida, Beni; Yao, Norman | In this talk, we will describe extensions of the study of scrambling and complexity to infinite-dimensional continuous variable (CV) systems. | Session 13: General Quantum Information and Quantum Computation |

197 | Characterizing the performance of continuous-variable Gaussian quantum gates | Sharma, Kunal; Wilde, Mark | In this work, we study different performance metrics to analyze how well these experimental approximations simulate the ideal Gaussian operations. | Session 13: General Quantum Information and Quantum Computation |

198 | Circuit Quantum Electrodynamics with superconductor-semiconductor hybrid systems | Scarlino, Pasquale; Van Woerkom, David; Mendes, Udson; Mueller, Clemens; Koski, Jonne; Landig, Andreas; Ungerer, Jann Hinnerk; Andersen, Christian; Gasparinetti, Simone; Reichl, Christian; Wegscheider, Werner; Ensslin, Klaus; Ihn, Thomas; Blais, Alexandre; Wallraff, Andreas | In this hybrid technology, we recently realized a proof of concept experiment, where the coupling between a transmon and a double QD (DQD) is mediated by virtual microwave photon excitations in a high impedance SQUID array resonator, which acts as a quantum bus enabling long-range coupling between dissimilar qubits [3]. | Session 14: Hybrid Systems: Coupling Spin Qubits with Microwave Resonators |

199 | Towards cavity-mediated coupling of spin-qubits | Borjans, Felix; Croot, Xanthe; Mi, Xiao; Petta, Jason | Here we present recent progress in our effort to complete this milestone. | Session 14: Hybrid Systems: Coupling Spin Qubits with Microwave Resonators |

200 | Multi-qubit entangling gates for spins in silicon | Gullans, Michael; Petta, Jason | We will discuss possible extensions of the resonant gate in more complex device architectures [2] and present a detailed analysis of multi-qubit gate fidelities. | Session 14: Hybrid Systems: Coupling Spin Qubits with Microwave Resonators |

201 | Using magnetically-resilient circuit QED techniques to study 2D materials | Boettcher, Charlotte; Vool, Uri; Liu, Yinyu; Wang, Joel; Calusine, Greg; Kim, David; Rosenberg, Danna; Yoder, Jonilyn; Yacoby, Amir; Oliver, William | We present results on superconducting resonators made of thin titanium nitride, studied in an in-plane magnetic field. | Session 14: Hybrid Systems: Coupling Spin Qubits with Microwave Resonators |

202 | Design of Multi-chip Module with High Impedance Microwave Resonators for cQED Experiments with Si/SiGe Quantum Dots | Holman, Nathan; Rosenberg, Danna; Yoder, Jonilyn; Oliver, William; Beck, Matthew; McDermott, Robert; Friesen, Mark; Coppersmith, Susan; Eriksson, Mark | We present the design of a multichip module consisting of a Si/SiGe quantum dot die bump-bonded to a TiN superconducting resonator die. | Session 14: Hybrid Systems: Coupling Spin Qubits with Microwave Resonators |

203 | Integrating singlet-triplet qubits with superconducting resonators | Harvey, Shannon; Boettcher, Charlotte; Fallahi, Saeed; Manfra, Michael; Yacoby, Amir | In my talk, I will discuss measurements we have done to study and quantify the impacts of these changes, as well as techniques we have developed to mitigate any negative effects. | Session 14: Hybrid Systems: Coupling Spin Qubits with Microwave Resonators |

204 | Understanding curvature (quantum capacitance) couplings of spin qubits to a superconducting cavity as a low-energy limit | Ruskov, Rusko; Tahan, Charles | We describe in a general perturbation theory approach the origin of the couplings of a spin qubit to a superconducting (electromagnetic) cavity. | Session 14: Hybrid Systems: Coupling Spin Qubits with Microwave Resonators |

205 | Exploring the sweet-spot regime of singlet-triplet qubits coupled to a microwave resonator | Abadillo-Uriel, Jose Carlos; Eriksson, Mark; Coppersmith, Susan; Friesen, Mark | In this work we explore this sweet-spot regime, which provides both resilience to charge noise and strong dipolar coupling to the resonator. | Session 14: Hybrid Systems: Coupling Spin Qubits with Microwave Resonators |

206 | Two-qubit gates between quantum dot spins coupled by a resonator | Warren, Ada; Barnes, Edwin; Economou, Sophia | We present here our theoretical calculation of the effective interaction between distant quantum dot spins coupled via a resonator and our proposed cavity-mediated two-qubit gate. | Session 14: Hybrid Systems: Coupling Spin Qubits with Microwave Resonators |

207 | Highly coherent spin states in carbon nanotubes coupled to cavity photons | Cubaynes, Tino; Delbecq, Matthieu; Dartiailh, Matthieu; Assouly, Réouven; Desjardins, Matthieu; Contamin, Lauriane; Bruhat, Laure; Leghtas, Zaki; Mallet, Francois; Cottet, Audrey; Kontos, Takis | In this talk, I will present a spin-qubit encoded in a carbon nanotube based double quantum dot with non-collinear ferromagnetic contacts. | Session 14: Hybrid Systems: Coupling Spin Qubits with Microwave Resonators |

208 | Magnon-photon coupling between a superconducting resonator and a thin film permalloy stripe | Li, Yi; Polakovic, Tomas; Wang, Yonglei; Xu, Jing; Lendinez, Sergi; Zhang, Zhizhi; Ding, Junjia; Khaire, Trupti; Saglam, Hilal; Divan, Ralu; PEARSON, JOHN; Kwok, Wai-Kwong; Xiao, Zhili; Novosad, Valentyn; Hoffmann, Axel; Zhang, Wei | In this work, we achieve strong magnon-photon coupling of a device ferromagnet of Ni 80Fe 20 (Py) to a high-quality NbN coplanar superconducting resonator. | Session 14: Hybrid Systems: Coupling Spin Qubits with Microwave Resonators |

209 | Long-distance coherent coupling of a spin qubit to a superconducting qubit | Landig, Andreas; Koski, Jonne; Scarlino, Pasquale; Van Woerkom, David; Reichl, Christian; Wegscheider, Werner; Wallraff, Andreas; Ensslin, Klaus; Ihn, Thomas | We demonstrate resonant and dispersive interaction between the two qubits mediated by real and virtual microwave photons. | Session 14: Hybrid Systems: Coupling Spin Qubits with Microwave Resonators |

210 | Broadband electron spin resonance spectroscopy with a superconducting resonator, Part 1 : Theory | Bourassa, Jerome; Brookes, Gregory; Lachance-Quirion, Dany; Roy-Guay, David; Lafond-Mercier, Raphaël; Desormiers, Léo; Bonneau, Vincent; Pioro-Ladriere, Michel | In this talk, we show how we can realize such broadband spectroscopy of spin systems using high-kinetic-inductance superconducting resonators. | Session 15: Hybrid Systems: Coupling to Ensembles and Single Electrons in Helium |

211 | Broadband electron spin resonance spectroscopy with a superconducting resonator, Part 2 : Experiments | Brookes, Gregory; Lachance-Quirion, Dany; Roy-Guay, David; Lafond-Mercier, Raphaël; Bourassa, Jerome; Pioro-Ladriere, Michel | Here, we present an alternative: a longitudinal spin-cavity coupling mechanism based on the effects of the spin polarization on high-kinetic-inductance superconducting resonators. | Session 15: Hybrid Systems: Coupling to Ensembles and Single Electrons in Helium |

212 | Effecting spontaneous coherence in hybridised cavity-spin ensemble systems with incoherent driving | Au Yeung, Rhonda; Szymanska, Marzena; Ginossar, Eran | This novel approach presents opportunities to search for exotic nonequilibrium phase transitions, as well as building hybrid quantum structures using a superconducting resonator coupled strongly to crystalline impurity spin centres in diamond [3] to study quantum simulation. | Session 15: Hybrid Systems: Coupling to Ensembles and Single Electrons in Helium |

213 | Superradiant emission from colour centres in diamond | Majer, Johannes | Here we explore superradiance in a system composed of a three-dimensional lumped element resonator in the fast cavity limit inductively coupled to an inhomogeneously broadened ensemble of nitrogen–vacancy centres. | Session 15: Hybrid Systems: Coupling to Ensembles and Single Electrons in Helium |

214 | Electron spin hyperpolarization via radiative cooling | Albanese, Bartolo; Probst, Sebastian; Ranjan, Vishal; Vion, Denis; Flurin, Emmanuel; Esteve, Daniel; Morton, John; Zhang, Gengli; Liu, Ren-Bao; Bertet, Patrice | In the present work we give a proof of principle of a new universal hyperpolarization scheme based on the coupling of the electron spins to a colder electromagnetic bath via Purcell-enhanced radiative relaxation. | Session 15: Hybrid Systems: Coupling to Ensembles and Single Electrons in Helium |

215 | Coherent spin-wave excitations in an optically cooled nuclear ensemble | Gangloff, Dorian; Ethier-Majcher, Gabriel; Lang, Constantin; Denning, Emil; Bodey, Jonathan; Jackson, Daniel; Le Gall, Claire; Atature, Mete | In this work, we engineer this very interaction between an InGaAs quantum dot electron spin and its isolated ensemble of nuclear spins in a driven-dissipative regime to remove entropic heat from the ensemble, and so vastly reduce the mean-field state uncertainty tied to its thermal fluctuations. | Session 15: Hybrid Systems: Coupling to Ensembles and Single Electrons in Helium |

216 | High-Q Superconducting Mm-wave Cavities for Rydberg Cavity Quantum Electrodynamics. | Suleymanzade, Aziza; Anferov, Alexander; Stone, Mark; Simon, Jonathan; Schuster, David | We present experimental results of superconducting fundamental mode niobium cavities at 100GHz, with quality factors exceeding 10^7. | Session 15: Hybrid Systems: Coupling to Ensembles and Single Electrons in Helium |

217 | Accessing Nonlinearity in Superconducting Millimeter Wave Coplanar Resonators | Anferov, Alexander; Suleymanzade, Aziza; Simon, Jonathan; Schuster, David | Here, we present and characterize low-loss millimeter wave resonators with planar geometries exhibiting nonlinear behavior, demonstrating a scalable core component for a new generation of high frequency quantum devices. | Session 15: Hybrid Systems: Coupling to Ensembles and Single Electrons in Helium |

218 | Coupling a single electron on helium to a superconducting resonator | Koolstra, Gerwin; Yang, Ge; Schuster, David | To trap a single electron on helium, we use a small electrostatic trap located at the voltage anti-node of a superconducting microwave resonator. | Session 15: Hybrid Systems: Coupling to Ensembles and Single Electrons in Helium |

219 | Thermopower based hot electron thermometry of helium surface states at 1.6 K | Kleinbaum, Ethan; Lyon, Stephen | We have developed a method to probe SSE temperature using the Seebeck effect. | Session 15: Hybrid Systems: Coupling to Ensembles and Single Electrons in Helium |

220 | Phase transitions in a strongly interacting electron system under confinement | Beysengulov, Niyaz; Rees, David; Zakharov, Mikhail; Lysogorskiy, Yurii; Kono, Kimitoshi; Tayurskii, Dmitrii | We show that for small number of rows gamma parameter (the ratio of Coulomb energy to thermal energy) is suppressed, while for large number of rows a BKT theory prediction is recovered. | Session 15: Hybrid Systems: Coupling to Ensembles and Single Electrons in Helium |

221 | Transport measurements of electrons above shallow helium-filled microchannels | Asfaw, Abraham; Kleinbaum, Ethan; Lyon, Stephen | In this talk, we report transport measurements of electrons on helium in a microchannel device where the channels are 200 nm deep and 3 ?m wide. | Session 15: Hybrid Systems: Coupling to Ensembles and Single Electrons in Helium |

222 | Acoustoelectric transport of electrons on helium | Byeon, Heejun; Nasyedkin, Kostyantyn; Lane, Justin; Beysengulov, Niyaz; Loloee, Reza; Pollanen, Johannes | We have performed time and frequency domain measurements and analysis to characterize the electric current dragged along by the SAW. | Session 15: Hybrid Systems: Coupling to Ensembles and Single Electrons in Helium |

223 | Heralded Scheme for Entangling Microwave-optical Modes in Cavity Piezo-optomechanics | Han, Xu; Zhong, Changchun; Zhang, Mengzhen; Zou, Chang-Ling; Fu, Wei; Xu, Mingrui; Wang, Zhixin; Shankar, Shyam; Devoret, Michel; Tang, Hong; Jiang, Liang | In this work, we propose a heralded scheme to entangle microwave and optical modes via parametric down conversion in a generic cavity piezo-optomechanical system. | Session 16: Hybrid Systems: Optomechanics and Microwave-Optical Transduction |

224 | Heralded Scheme for Entangling Microwave-optical Modes in Cavity Piezo-optomechanics | Zhong, Changchun; Han, Xu; Wang, Zhixin; Zhang, Mengzhen; Zou, Chang-Ling; Fu, Wei; Xu, Mingrui; Shankar, Shyam; Devoret, Michel; Tang, Hong; Jiang, Liang | In this work, we propose a heralded scheme to entangle microwave and optical modes via parametric down conversion in a generic cavity piezo-optomechanical system. | Session 16: Hybrid Systems: Optomechanics and Microwave-Optical Transduction |

225 | An Optomechanical Transducer for Quantum State Transfer Between Infrared Light and Microwave. Part I: Fabrication | Chou, Ming-Han; Peairs, Gregory; Povey, Rhys; Satzinger, Kevin; Bienfait, Audrey; Chang, Hung-Shen; Conner, Christopher; Dumur, Etienne; Grebel, Joel; Zhong, Youpeng; Cleland, Andrew | In this talk, we will describe our fabrication process, which includes how we combine an aluminum nitride-based interdigital transducer (IDT) with a silicon-based one-dimensional optomechanical resonator, using a multi-layer process combining thin-film deposition and etching with patterning provided by a combination of optical and electron-beam lithography. | Session 16: Hybrid Systems: Optomechanics and Microwave-Optical Transduction |

226 | An Optomechanical Transducer for Quantum State Transfer Between Infrared Light and Microwave. Part II: Measurement Results | Peairs, Gregory; Chou, Ming-Han; Povey, Rhys; Satzinger, Kevin; Bienfait, Audrey; Chang, Hung-Shen; Conner, Christopher; Dumur, Etienne; Grebel, Joel; Zhong, Youpeng; Cleland, Andrew | We will present recent results using this device, including characterization of the electromechanical and optomechanical elements as well as classical operation using continuous-wave and time-domain signals. | Session 16: Hybrid Systems: Optomechanics and Microwave-Optical Transduction |

227 | Two dimensional optomechanical crystal designs for microwave-optical transduction | Povey, Rhys; Chou, Ming-Han; Peairs, Gregory; Bienfait, Audrey; Chang, Hung-Shen; Conner, Christopher; Dumur, Etienne; Grebel, Joel; Zhong, Youpeng; Cleland, Andrew | In this talk I will discuss ongoing efforts towards a two dimensional optomechanical crystal and cavity design, whilst using piezoelectric materials to convert microwave electrical signals to mechanical motion. | Session 16: Hybrid Systems: Optomechanics and Microwave-Optical Transduction |

228 | Microwave-mechanical-optical transducer chip design innovations for noise mitigation | Burns, Peter; Brubaker, Benjamin; Urmey, Maxwell; Mittal, Sarang; Higginbotham, Andrew; Regal, Cindy; Lehnert, Konrad | In order to reduce the added noise from mechanical decoherence, we have integrated phononic shielding around the mechanical element. | Session 16: Hybrid Systems: Optomechanics and Microwave-Optical Transduction |

229 | Low temperature measurement of SiGe properties for superconducting quantum circuits | Sandberg, Martin; Brink, Markus; Adiga, Vivekananda; Chavez-Garcia, José; Chow, Jerry; Paik, Hanhee; Orcutt, Jason | We find that that the introduction of SiGe in the substrate stack does not degrade the coherence properties of the transmon qubit. | Session 16: Hybrid Systems: Optomechanics and Microwave-Optical Transduction |

230 | Circuit cavity optomechanics approaching the ultrastrong coupling regime | Peterson, Gabriel; Kotler, Shlomi; Lecocq, Florent; Jin, X. Y.; Cicak, Katarina; Simmonds, Raymond; Aumentado, Jose; Teufel, John | In this talk, I will present experimental progress on a new architecture for cavity optomechanics where a mechanically compliant vacuum-gap capacitor resonates with a 3-dimensional microwave cavity. | Session 16: Hybrid Systems: Optomechanics and Microwave-Optical Transduction |

231 | Generation of nonclassical states using quantum emitters in the metal-dielectric surface | Mehta, Karun; Dasgupta, Shubhrangshu | We show that it is possible to generate optical photons in nonclassical states from a metal-dielectric interface using quantum emitters on the interface. | Session 16: Hybrid Systems: Optomechanics and Microwave-Optical Transduction |

232 | A three-dimensional optomechanical system for experiments in the quantum limit | Gunupudi, Bindu Malini; Das, Soumya; Navarathna, Rohit; Sahu, Sudhir; Majumder, Sourav; Singh, Vibhor | In this work, we present design and measurements of two independent mechanical resonator device coupled to a 3-dimensional rectangular waveguide cavity. | Session 16: Hybrid Systems: Optomechanics and Microwave-Optical Transduction |

233 | Study of coherent microwave-to-optical transduction using on-chip rare-earth ion devices | Bartholomew, John; Rochman, Jake; Kindem, Jonathan; Ruskuc, Andrei; Faraon, Andrei | We will present the fabrication and characterization of on-chip REI devices based on 171Yb-doped yttrium orthovanadate ( 171Yb:YVO 4). | Session 16: Hybrid Systems: Optomechanics and Microwave-Optical Transduction |

234 | Towards on-chip cavity-enhanced microwave to optical conversion using erbium doped crystals | Rochman, Jake; Bartholomew, John; Craiciu, Ioana; Wang, Chuting; Xie, Tian; Kindem, Jonathan; Schwab, Keith; Faraon, Andrei | Here, we present an integrated platform composed of a superconducting microwave resonator and an amorphous silicon photonic resonator coupled to an erbium ensemble doped in the yttrium orthosilicate substrate. | Session 16: Hybrid Systems: Optomechanics and Microwave-Optical Transduction |

235 | Photon super-bunching from a generic tunnel junction | Leon, Christopher; Roslawska, Anna; Grewal, Abhishek; Gunnarsson, Olle; Kuhnke, Klaus; Kern, Klaus | Here we demonstrate fulfilling this requirement with a generic tip-surface metal junction. | Session 16: Hybrid Systems: Optomechanics and Microwave-Optical Transduction |

236 | Reliable characterization for improving and validating accurate elementary quantum operations | Sugiyama, Takanori; Imori, Shinpei; Tanaka, Fuyuhiko | Here we derive the asymptotic convergence rate, which would be optimal, and show numerical results on 1-qubit system, which confirm the theoretical results and prove that RSCQT is useful in practice. | Session 16: Hybrid Systems: Optomechanics and Microwave-Optical Transduction |

237 | Measuring Electromagnetic and Gravitational Responses of Photonic Landau Levels | Schine, Nathan | In this talk, I will present how a nonplanar resonator can harbor a quantum Hall system in curved space. | Session 17: Hybrid/Macroscopic Quantum Systems, Optomechanics, and Interfacing AMO with Solid State/Nano Systems |

238 | Dynamically Generated Synthetic Electric Fields for Photons | Zapletal, Petr; Walter, Stefan; Marquardt, Florian | Here, we show how synthetic electric fields for photons arise self-consistently due to the nonlinear dynamics in a driven system. | Session 17: Hybrid/Macroscopic Quantum Systems, Optomechanics, and Interfacing AMO with Solid State/Nano Systems |

239 | A polarization-selective cavity inside a hollow-core optical fiber | Flannery, Jeremy; Semnani, Behrooz; Bajcsy, Michal | We fabricate and characterize a polarization-selective cavity inside a hollow-core optical fiber by attaching photonic-crystal (PC) membranes acting as metasurface mirrors to the end faces of a segment of such fiber. | Session 17: Hybrid/Macroscopic Quantum Systems, Optomechanics, and Interfacing AMO with Solid State/Nano Systems |

240 | Quantum Noise Free Thermal Noise Measurements of a Fabry-Perot Cavity | Cullen, Torrey | By showing that the cross correlated output and previous measurements of thermal noise are the same, we confirm that these quantum effects have been eliminated from the measurement (because thermal noise is the next limiting noise source). | |

241 | Multimode Cavity Optomechanics in superfluid Helium droplets | Aiello, Andrea | In this presentation we illustrate the principal unusual characteristics of the multimode dynamics [4] of the optically excited Helium droplet and we present some preliminary results about nonlinear effects. | |

242 | Towards two spin-mechanical hybrid quantum systems | Rosenfeld, Emma; Gieseler, Jan; Kabcenell, Aaron; Safira, Arthur; Schuetz, Martin; Lukin, Mikhail | To address this challenge, we investigate two mechanical resonators, each of which are coupled to a spin: (i) high-Q nanobeam SiN resonators and (ii) levitated mechanical oscillators. | |

243 | Optimized single-shot laser ablation of concave mirror templates on optical fibers | Ruelle, Thibaud; Poggio, Martino; Braakman, Floris | We find that these geometrical characteristics can be tuned to a larger extent than has been previously reported, and notably observe that compound convex-concave shapes can be obtained. | |

244 | Topological phononics at the nanoscale: All-optical excitation and read-out of helical vibrations on a chip | Shah, Tirth; Peano, Vittorio; Brendel, Christian; Painter, Oskar; Pfeifer, Hannes; Marquardt, Florian | We present the design of and numerical simulations for an on-chip optomechanical device that supports helical vibrations and allows all-optical excitation and read-out thereof. | |

245 | Magnon heralding in cavity optomagnonics | Bittencourt, Victor; Feulner, Verena; Viola-Kusminskiy, Silvia | In this context, we propose a magnon heralding protocol to generate a magnon Fock state by detecting a cavity photon. | |

246 | Faddeev-Kulish Asymptotic States in Cold Atom Quantum Physisorption on 2D Materials | Sengupta, Sanghita | In particular, we present the results of our resummation procedures for the physisorption rate of cold atomic hydrogen as function of membrane sizes and temperature. | |

247 | Cavity Superconductor-Polaritons | Allocca, Andrew; Raines, Zachary; Curtis, Jonathan; Galitski, Victor | Following the success of realizing exciton-polariton condensates in cavities, we examine the hybridization of cavity photons with the closest analog of excitons within a superconductor, states called Bardasis-Schrieffer modes. | |

248 | Cavity superconductor Higgs-polaritons | Raines, Zachary; Allocca, Andrew; Galitski, Victor | Motivated by the dramatic success of cavity exciton-polariton physics we consider the formation of a polariton from cavity photons and the amplitude mode of a disordered superconductor. | |

249 | Investigating Light-Matter Interactions Through the Coupling of Single Emitters to Bowtie Nanoantennas | Kimmitt, Nathan; Wertz, Esther | In this study, to elucidate the effects of the nanometric positioning of the emitter, we employ super-resolution single-molecule fluorescence techniques to study the effects of detuning, polarization, orientation, nanometer gap size, and adhesion layer have on the fluorescence properties of the dye, as well as the trapping dynamics of the system. | |

250 | Entanglement of Two Remote Mechanical Resonators | Riedinger, Ralf; Wallucks, Andreas; Marinkovi?, Igor; Hong, Sungkun; Aspelmeyer, Markus; Groeblacher, Simon | Here we report on the entanglement of two massive mechanical oscillators located on separate chips. | |

251 | Optical Backaction-Evading Measurement of a Mechanical Oscillator | Shomroni, Itay; Qiu, Liu; Malz, Daniel; Nunnenkamp, Andreas; Kippenberg, Tobias | Here we demonstrate continuous two-tone BAE measurement in the optical domain of a localized GHz frequency mechanical mode of a photonic crystal nanobeam cryogenically and optomechanically cooled close to the ground state, employing quantum-limited detection. | |

252 | Cavity cooling of levitated nanospheres by coherent scattering | Delic, Uros; Reisenbauer, Manuel; Grass, David; Kiesel, Nikolai; Aspelmeyer, Markus | We confirm the trapping of nanospheres of nominal radius through a novel method using the variable coupling to a cavity mode. | |

253 | Coupled Piezoelectric and Optomechanical Resonators for RF-to-optical Frequency Conversion | Wu, Marcelo; Guha, Biswarup; Balram, Krishna; Srinivasan, Kartik | We propose an on-chip nanoscale converter that connects RF signals to mechanical degrees of freedom using a piezoelectric resonator and then bridges to the optical domain using an optomechanical resonator. | |

254 | Laser heating of a charged gold nanosphere levitated in an ion trap at high vacuum | Coppock, Joyce; Klueter, Samuel; Hannan, José; Kane, Bruce | In this talk, we present evidence of the heating of 250 nm gold spheres to temperatures in the range of 1000-1250 K, near the melting temperature of 1337 K. Further heating of the particle should enable trapping and observation of a molten droplet. | |

255 | Engineering dissipation dilution of strained nanomechanical resonators | Fedorov, Sergey; Engelsen, Nils Johan; Bereyhi, Mohammadjafar; Beccari, Alberto; Ghadimi, Amir; Schilling, Ryan; Wilson, Dalziel; Kippenberg, Tobias | We show that soft clamping combined with strain engineering can be applied to nanobeams to produce record-high quality factors up to 800 million at room temperature and Q × frequency exceeding 10^15 Hz. | |

256 | Phononic integrated circuit | Fu, Wei; Shen, Zhen; Zou, Chang-Ling; Xu, Yuntao; Cheng, Risheng; Tang, Hong | Here we experimentally realize such a phononic integrated circuit architecture through exploiting GaN-on-sapphire platforms which provide efficient confinement and routing of phonons in the top layer. | |

257 | Radio-frequency optomechanical characterization of a silicon nitride drum | Pearson, Anna; Khosla, Kiran; Mergenthaler, Matthias; Briggs, George; Laird, Edward; Ares, Natalia | Radio-frequency optomechanical characterization of a silicon nitride drum | |

258 | Realization of directional amplification in a microwave optomechanical device | Mercier de Lépinay, Laure; Damskägg, Erno; Ockeloen-Korppi, Caspar; Sillanpää, Mika | Using a device including two on-chip superconducting resonators and two metallic drumhead mechanical oscillators, we experimentally demonstrate how to use this generic cavity optomechanical system to non-reciprocally amplify microwave signals. | |

259 | Strong Multimodal Coupling in 2D Material based NEMS Resonator | Prasad, Parmeshwar; Arora, Nishta; Naik, Akshay | Here in the present work, we engineer a single resonator made of two-dimensional material to ool its low frequency mechanical mode. | |

260 | Coupling of single photon emitters in hBN to microcavities | Proscia, Nicholas; Jayakumar, Harishankar; Shotan, Zav; Lopez-Morales, Gabriel; Ge, Xiaochen; Zhou, Weidong; Meriles, Carlos; Menon, Vinod | Here, we demonstrate coupling of hBN defect emission to Si 3N 4 microdisk cavities by exploiting the topography of the cavity structure to engineer strain and thereby activate SPEs which near field couple to the cavities. | |

261 | Valley-Mechanical Coupling in a Monolayer Semicondoctor | Li, Haokun; Fong, King Yan; Zhu, Hanyu; Li, Quanwei; Wang, Siqi; Yang, Sui; Wang, Yuan; Zhang, Xiang | We realize valley-mechanical coupling in a monolayer MoS2 resonator and demonstrate transduction of valley information to the mechanical states. | |

262 | Interference effects in cavity optomechanics with hybridized membranes | Cernotik, Ondrej; Genes, Claudiu; Dantan, Aurelien | In particular, we demonstrate that, in the former system, a three-body interaction between the cavity field, emitters, and mechanical motion can be used to improve cooling of the mechanical motion [1]. Second, we show that, when an esnemble of emitters or a photonic crystal structure in the membrane strongly modifies the membrane reflectivity, the cavity linewidth can be significantly reduced and the system can reach the sideband resolved regime. | |

263 | Trapping Ultracold Fermionic Atoms in a Ring Bowtie Cavity | Wright, Kevin; Cai, Yanping; Allman, Daniel | After reporting on the performance of this first cavity, we will describe plans to use cavities of this type to study coupled atom-cavity systems in previously unexplored configurations | |

264 | Controlling thermal fluctuation of phonon modes with nonreciprocal dynamics in an optomechanical system | Xu, Haitan; Jiang, Luyao; Clerk, Aashish; Harris, Jack | We achieved phonon isolation which can be tuned continuously over a wide range from -30dB to 30dB. | |

265 | Diamond optomechanical crystals with embedded nitrogen-vacancy centers | Cady, Jeff; Michel, Ohad; Lee, Kenneth; Jayich, Ania | As a preliminary step toward the high cooperativity regime in NV center-based hybrid mechanical devices, we design and fabricate single-crystal diamond optomechanical crystals (OMCs), which host GHz-scale mechanical modes and telecom-band optical modes and contain embedded NV centers. | |

266 | Persistent and Reversible Frequency Tuning in Graphene/Hexagonal Boron-Nitride Nanomechanical Resonators | Miller, David; Blaikie, Andrew; Aleman, Benjamin | Here, we demonstrate that the resonance frequency of nanomechanical resonators can be persistently and reversibly tuned using photoelectric doping[1]. | |

267 | Cooling and amplifying motion of a diamond nanobeam via translation of a focussed laser beam | Jayakumar, Harishankar; Khanaliloo, Behzad; Lake, David; Barclay, Paul | Using a confocal microscope, we demonstrate tunable amplification and damping of a diamond nanomechanical resonator’s motion. | |

268 | Measuring the Casimir torque | Munday, Jeremy | In this presentation I will discuss counter-intuitive ways to increase the torque (e.g. placing the objects in a dielectric medium rather than vacuum) and our recent experiments that confirm its existence. | |

269 | Optomechanics for NEMS based Mass Spectrometry | Rej, Ewa; Li, Jarvis; Fon, Warren; Matheny, Matthew; Roukes, Michael | Here we detail a new scheme for NEMS mass sensing based on superconducting microwave cavity optomechanics. | |

270 | Search for light scalar dark matter using optomechanical systems | Singh, Swati | In this talk, we will explore optomechanical resonators as detectors of scalar dark matter in the 10 -12 – 10 -6 eV regime. | |

271 | Enhanced Optomechanics with Nanostructured Material | Yang, Li-Fan; Datta, Anurup; Hsueh, Yu-Chun; Xu, Xianfan; Webb, Kevin | We demonstrate for the first time that this pressure can be exceeded by a substantial factor by structuring a surface. | |

272 | Cryogenic Optical and Spin Characterization of Tin-Vacancy Centers in Diamond | Trusheim, Matthew; Pingault, Benjamin; Wan, Noel; Gundogan, Mustafa; De Santis, Lorenzo; Chen, Kevin; Walsh, Michael; Rose, Joshua; Becker, Jonas; Bersin, Eric; Malladi, Girish; Bakhru, Hassaram; Walmsley, Ian; Atature, Mete; Englund, Dirk | Specifically, we will describe its electronic structure, optical signatures of spin, and coherent optical and spin properties. | |

273 | Utilizing the nonlinear dynamical response of an optically damped mechanical oscillator | Borkje, Kjetil | We consider a standard cavity optomechanics setup where a mechanical oscillator is coherently driven at its resonance frequency. | |

274 | Ground-state cooling of a mechanical resonator enabled by critical coupling and dark entangled states | Cortes, Cristian; Otten, Matthew; Gray, Stephen | In this work, we present a novel approach for resonant phonon cooling using the concept of critical coupling, subradiance, and many-body entanglement within an ensemble of two-level systems. | |

275 | Single Photon Generation Using Integrated 2D-material-based Cavity-Emitter Systems | Peyskens, Frederic; Van Thourhout, Dries; Englund, Dirk | We will present our work on the integration of 2D materials on top of a mature silicon nitride photonic platform and moreover elaborate on our analytical framework to describe the interaction of a 2D-material-based cavity-emitter system with a dielectric photonic waveguide. | |

276 | Cavity optomagnonics with magnetic textures: coupling a magnetic vortex to light | Graf, Jasmin; Pfeifer, Hannes; Marquardt, Florian; Viola-Kusminskiy, Silvia | We propose a cavity-optomagnonic system with a non homogeneous magnetic ground state, namely a vortex in a magnetic microdisk. | |

277 | Nonlinear dynamics in disordered optomechanical arrays | Figueiredo Roque, Thales; Marquardt, Florian; Peano, Vittorio; Yevtushenko, Oleg | In this talk, we focus on the nonlinear dynamics of disordered OMA. | |

278 | Modeling the Adsorption-Desorption Phase Noise in Optomechanical Oscillators | Mathai, Cijy; Tallur, Siddharth | In this work, we study the impact of adsorption and desorption (of gas molecules on the resonator surface) on phase noise in OMOs, based on noise analysis in mechanical oscillators [ IEEE TUFFC. | |

279 | Rolf Landauer and Charles H. Bennett Award in Quantum Computing talk: Repeated parity measurement and feedback in a mixed-species trapped ion register | Home, Jonathan | I will describe experiments in which we demonstrate up to 50 sequential measurements of correlations between two beryllium ion microwave qubits using an ancillary optical-frequency qubit in a calcium ion, and implement feedback that allows us to stabilize two-qubit subspaces as well as maximally entangled Bell states [1]. | Session 18: Landauer-Bennett Award Session: Quantum Error Correction Theory and Experiment |

280 | Optimality of Gottesman-Kitaev-Preskill (GKP) Codes for Bosonic Quantum Error Correction | Noh, Kyungjoo; Albert, Victor; Jiang, Liang | In particular, we solve the biconvex optimization heuristically by an alternating semi-definite programming method and show that, starting from Haar random initial codes, our numerical optimization yields a hexagonal GKP code as an optimal encoding in a practically relevant regime [2]. | Session 18: Landauer-Bennett Award Session: Quantum Error Correction Theory and Experiment |

281 | High-threshold fualt-tolerant quantum computation with GKP qubits and realistically noisy devices | Fukui, Kosuke; Tomita, Akihisa; Fujii, Keisuke | We have proposed a method to reduce the required squeezing level to realize large scale quantum computation with the GKP qubits [Phys. | Session 18: Landauer-Bennett Award Session: Quantum Error Correction Theory and Experiment |

282 | Grid states for encoding and stabilizing a logical qubit in superconducting circuits (Part 1) | Eickbusch, Alec; Touzard, Steven; Campagne-Ibarcq, Phillipe; Zalys-Geller, Evan; Frattini, Nicholas; Sivak, Volodymyr; Puri, Shruti; Mirrahimi, Mazyar; Shankar, Shyam; Devoret, Michel | In this talk, I will review GKP code properties and present a protocol based on a tunable interaction with an ancillary two-level system to create and stabilize GKP grid states using phase-estimation of the harmonic oscillator field. | Session 18: Landauer-Bennett Award Session: Quantum Error Correction Theory and Experiment |

283 | Grid states for encoding and stabilizing a logical qubit in superconducting circuits (Part 2) | Touzard, Steven; Eickbusch, Alec; Campagne-Ibarcq, Phillipe; Zalys-Geller, Evan; Frattini, Nicholas; Sivak, Volodymyr; Puri, Shruti; Mirrahimi, Mazyar; Shankar, Shyam; Devoret, Michel | In this talk, I will show how to engineer such a modulated interaction and I will present our experimental progress towards the creation and stabilization of GKP grid states. | Session 18: Landauer-Bennett Award Session: Quantum Error Correction Theory and Experiment |

284 | Continuous symmetries and approximate quantum error correction | Faist, Philippe; Ghazi Nezami, Sepehr; Albert, Victor; Salton, Grant; Pastawski, Fernando; Hayden, Patrick; Preskill, John | Here, we show that any code is fundamentally limited in its ability to approximately error-correct against erasures at known locations if it is covariant with respect to a continuous local symmetry. | Session 18: Landauer-Bennett Award Session: Quantum Error Correction Theory and Experiment |

285 | Numerically optimized quantum error-correcting codes for a bosonic mode | Silveri, Matti; Mäkinen, Kari | We present the structure and analyze the performance of these numerically optimized codes. | Session 18: Landauer-Bennett Award Session: Quantum Error Correction Theory and Experiment |

286 | Single-mode bosonic error correcting codes with rotation symmetry | Grimsmo, Arne; Combes, Joshua; Baragiola, Ben | I will introduce a universal scheme for this class of codes based only on simple and experimentally well-motivated interactions. | Session 18: Landauer-Bennett Award Session: Quantum Error Correction Theory and Experiment |

287 | Simplified mixed-state encoding for quantum computation with continuous-variable systems | Marshall, Kevin; James, Daniel; Paler, Alexandru; Lau, Hoi-Kwan | In this work, we present a simplified MSE that does not suffer from any of these drawbacks. | Session 18: Landauer-Bennett Award Session: Quantum Error Correction Theory and Experiment |

288 | Fault-tolerant gates on a logical qubit | Rosenblum, Serge; Reinhold, Philip; Ma, Wenlong; Jiang, Liang; Frunzio, Luigi; Schoelkopf, Robert | Here, we present a fault-tolerant construction for a gate on a cavity-encoded logical qubit. | Session 18: Landauer-Bennett Award Session: Quantum Error Correction Theory and Experiment |

289 | Optimal condition for a cavity QED-based fault-tolerant quantum computation | Asaoka, Rui; Kanamoto, Rina; Tokunaga, Yuuki; Aoki, Takao | In this work, we theoretically investigate optimal conditions for the cavity-QED-based quantum gate. | Session 18: Landauer-Bennett Award Session: Quantum Error Correction Theory and Experiment |

290 | Simulation of Gaussian channels via teleportation with applications to error correction and secret-key capacities. | Tserkis, Spyros; Dias, Josephine; Laurenza, Riccardo; Braunstein, Samuel; Pirandola, Stefano; Ralph, Timothy | Since the construction of the Choi-state requires infinite mean energy and entanglement, i.e. it is unphysical, we derive instead every physical state able to simulate a given channel through teleportation with finite resources. | Session 18: Landauer-Bennett Award Session: Quantum Error Correction Theory and Experiment |

291 | Recovering noise-free quantum observables | Otten, Matthew; Gray, Stephen | We introduce a technique for recovering noise-free observables in noisy quantum systems by combining the results of many slightly different experiments. | Session 18: Landauer-Bennett Award Session: Quantum Error Correction Theory and Experiment |

292 | A New Technique to Measure Microwave Dielectric Material Loss | Li, Kaicheng; Axline, Christopher; Burkhart, Luke; Chapman, Benjamin; Lei, Chan U; Jain, Vijay; Krayzman, Lev; Reinhold, Philip; Frunzio, Luigi; Schoelkopf, Robert | In this talk, we describe a sensitive method to selectively measure microwave dielectric substrate loss and present preliminary measurements with the technique. | Session 19: Materials and Fabrication for Superconducting Qubits |

293 | Atomic defects in silicon compared with standard two-level defects | Yu, Liuqi; Rosen, Y. J.; Osborn, Kevin | Here, we extend the measurements by using a new dielectric which is important in light of qubit substrates and semiconductor qubit devices: amorphous silicon. | Session 19: Materials and Fabrication for Superconducting Qubits |

294 | Atomic Layer Deposition of Titanium Nitride for Quantum Circuits | Shearrow, Abigail; Koolstra, Gerwin; Whiteley, Samuel; Earnest, Nathan; Barry, Peter; Heremans, Joseph; Awschalom, David; Shirokoff, Erik; Schuster, David | We demonstrate that titanium nitride thin films grown via plasma-enhanced atomic layer deposition support superconducting microwave resonators with internal quality factors up to 1.0 million at single photon powers, and find that the dominant loss mechanism in these resonators is likely due to two-level systems. | Session 19: Materials and Fabrication for Superconducting Qubits |

295 | Fabrication of Sn-Cu alloy superconducting films for filled superconducting through-silicon vias | Fujii, Go; Ukibe, Masahiro; Makise, Kazumasa; Hidaka, Mutsuo; Nagasawa, Shuichi; Yamamori, Hirotake; Inomata, Kunihiro; Yamada, Takahiro; Kawabata, Shiro | In this work, we have changed the material from the Sn to Sn-Cu alloy to solve the above problem. | Session 19: Materials and Fabrication for Superconducting Qubits |

296 | Fabrication of superconducting qubits using free-standing mineral masks | Tsioutsios, Ioannis; Serniak, Kyle; Wang, Zhixin; Shankar, Shyam; Frunzio, Luigi; Schoelkopf, Robert; Devoret, Michel | In this talk, we will propose a new fabrication technology for planar superconducting circuits that replaces the commonly used resist-based lithography masks with free-standing mineral masks. | Session 19: Materials and Fabrication for Superconducting Qubits |

297 | MBE grown AlN-TiN heterostructures for superconducting quantum circuits | Richardson, Christopher; Alexander, Ashish; Weddle, Christopher | Here early stages of this approach are evaluated through measurement of the single photon loss of aluminum nitride that is explored as both an overlayer and underlayer of TiN superconducting CPW resonators. | Session 19: Materials and Fabrication for Superconducting Qubits |

298 | Microwave loss in amorphous silicon for coherent superconducting technologies | Koehl, William; Steers, Stanley; Khalil, Moe; Cochran, Jon; Queen, Daniel; Hackley, Justin; Lim, Khyhouth; Kelliher, Jim; Doyle, Austin; Warner, Patrick; Lilly, Monica; Stoutimore, Micah | We discuss current microstructural models of defectivity in amorphous silicon (a-Si), a material commonly used in the semiconductor and solar industries, and relate these concepts to microwave photon loss in superconducting resonators fabricated on a-Si films deposited under growth conditions targeting low defect incorporation. | Session 19: Materials and Fabrication for Superconducting Qubits |

299 | Optical Direct-Write Lithography of Shadow Mask Josephson Junctions | Monroe, Jonathan; Murch, Kater | We have developed a technique to fabricate Josephson junctions with a direct-write laser lithography system, enabling fast writing of large-area patterns. | Session 19: Materials and Fabrication for Superconducting Qubits |

300 | Surface Loss Characterization and Comparison in Aluminum, Niobium, and Titanium Nitride Superconducting Resonators | Melville, Alexander; Calusine, Greg; Woods, Wayne; Golden, Evan; Miloshi, Jovi; Sevi, Arjan; Yoder, Jonilyn; Oliver, William | We developed a technique utilizing isotropic etching to assign a specific loss tangent to each dielectric, and use that to determine the dominant dielectric losses for a specific fabrication process, enabling targeted geometry and process changes to maximize performance. | Session 19: Materials and Fabrication for Superconducting Qubits |

301 | Study of atomic two-level defects within a Josephson junction proxy | Hung, Chih-Chiao; Forouzani, Neda; Osborn, Kevin | Here, we present a study of TLSs in parallel plate capacitors mimicking a JJ (Al/AlOx/Al), but where the dielectric layer is 20 nm and therefore block the tunneling supercurrent. | Session 19: Materials and Fabrication for Superconducting Qubits |

302 | Microwave Properties of Exfoliated Hexagonal Boron Nitride | Antony, Abhinandan; Gustafsson, Martin; Ribeill, Guilhem; Banerjee, Mitali; Ohki, Thomas; Hone, James; Fong, Kin | We investigate the microwave properties of thin flakes of hexagonal boron nitride (h-BN), which have the potential to serve as low-loss elements in superconducting transmon qubits. | Session 19: Materials and Fabrication for Superconducting Qubits |

303 | Operating a Quantum Processor with Material Defects | Klimov, Paul | In this talk, I will discuss recent research towards understanding defect properties, the defect avoidance problem, and related benchmarks. | Session 19: Materials and Fabrication for Superconducting Qubits |

304 | A blueprint for demonstrating quantum supremacy with superconducting qubits | Neill, Charles | We present data characterizing two basic ingredients required for any supremacy experiment: complexity and fidelity. | Session 20: Multi-Qubit Characterizations and Cross-talk For Superconducting Qubits |

305 | Operating and Characterizing of a 72 Superconducting Qubit Processor “Bristlecone”: Part 1 | Kelly, Julian; Chen, Zijun; Chiaro, Ben; Foxen, Brooks; Martinis, John | In this talk, we will discuss the 72 qubit “Bristlecone” processor we have been developing at Google, and our work towards calibrating, operating, and characterizing this device. | Session 20: Multi-Qubit Characterizations and Cross-talk For Superconducting Qubits |

306 | Operating and Characterizing a 72 Superconducting Qubit Processor “Bristlecone”: Part 2 | Chen, Zijun; Kelly, Julian; Chiaro, Ben; Foxen, Brooks; Martinis, John | In this talk, we will discuss the 72 qubit “Bristlecone” processor we have been developing at Google, and our work towards calibrating, operating, and characterizing this device. | Session 20: Multi-Qubit Characterizations and Cross-talk For Superconducting Qubits |

307 | Characterization and mitigation of noise and crosstalk in a five-qutrit transmon processor | Ramasesh, Vinay; Blok, Machiel; O’Brien, Kevin; Dahlen, Dar; Kreikebaum, John Mark; Siddiqi, Irfan | For each of these issues, we present methods of characterization and mitigation, demonstrating their efficacy on our hardware and the future design choices they inform. | Session 20: Multi-Qubit Characterizations and Cross-talk For Superconducting Qubits |

308 | Automatic calibration of arrays of superconducting qubits and couplers | Satzinger, Kevin; Foxen, Brooks; Chiaro, Ben; McEwen, Matthew; Martinis, John | In this presentation, we describe algorithms and experiments to automatically calibrate superconducting qubits and couplers. | Session 20: Multi-Qubit Characterizations and Cross-talk For Superconducting Qubits |

309 | Coupler characterization of transmons for cross-resonance | Paik, Hanhee; Chavez-Garcia, José; Sandberg, Martin; Jinka, Oblesh; Yau, Jeng-Bang; Shao, Dongbing; Solgun, Firat; Brink, Markus; Chow, Jerry | We characterize two-qubit cross-resonance gates and unintended residual coupling on various coupled qubit arrangements. | Session 20: Multi-Qubit Characterizations and Cross-talk For Superconducting Qubits |

310 | Deletrious Effects of Spectator Qubits in Multiqubit Circuits | Wei, Xuan; McKay, David; Sheldon, Sarah; Magesan, Easwar; Gambetta, Jay | Here we will discuss our studies on these spectator qubits, for example, by measuring the entanglement dynamics of the spectator qubit with the active qubits. | Session 20: Multi-Qubit Characterizations and Cross-talk For Superconducting Qubits |

311 | Measuring and quantifying classical crosstalk in multi-qubit superconducting circuits | Jurcevic, Petar; Kandala, Abhinav; Corcoles, Antonio; Magesan, Easwar; Chow, Jerry; Gambetta, Jay | Here, we shall present techniques to measure and quantify classical crosstalk, and use them to probe the microwave environment of our chips. | Session 20: Multi-Qubit Characterizations and Cross-talk For Superconducting Qubits |

312 | Multi-qubit circuit characterization through physics-based statistical inference | Smelyanskiy, Vadim; Boixo, Sergio; Gharibyan, Hrant; Niu, Murphy Yuezhen; Kechedzhi, Kostyantyn; Kafri, Dvir; Barends, Rami; Petukhov, Andre; Neven, Hartmut | We develop new physical models for realistic two-qubit gates in superconducting qubit architectures to account for specific shape of qubit control pulses and effects of noise and decoherence, including those induced by two-level defects prevalent in the fabrications of superconducting chip. | Session 20: Multi-Qubit Characterizations and Cross-talk For Superconducting Qubits |

313 | Mode Hybridization Analysis of Bus Resonators for a Superconducting Multi-Qubit Chip | Haider, Nadia; Gnanadhas, Jonathan; Beekman, Marc; Vollmer, Rene; Muthusubramanian, Nandini; Caudillo, Roman; Bruno, Alessandro; Michalak, David; Malinowski, Filip; Bultink, Cornelis Christiaan; Elsherbini, Adel; Lampert, Lester; Yarovoy, Alexander; Clarke, Jim; DiCarlo, Leonardo | We present an effective numerical method to analyze the mode hybridization in a multi-transmon circuit QED chip. | Session 20: Multi-Qubit Characterizations and Cross-talk For Superconducting Qubits |

314 | A many-body coupler for coherent 4-local interaction of superconducting flux qubits | Menke, Tim; Hirjibehedin, Cyrus; Weber, Steven; Samach, Gabriel; Gustavsson, Simon; Aspuru-Guzik, Alan; Oliver, William; Kerman, Andrew | Here we present a circuit that enables large 4-local interaction between four flux qubits without spurious 2-local terms and without relying on an effective low-energy description as in Hamiltonian gadgets. | Session 20: Multi-Qubit Characterizations and Cross-talk For Superconducting Qubits |

315 | Robust And Versatile Superconducting Coupler | Leroux, Catherine; Di Paolo, Agustin; Blais, Alexandre | In this talk, we present a novel tunable superconducting dipole coupling element that enables a variety of strong two-qubit interactions by modulating external fields. | Session 20: Multi-Qubit Characterizations and Cross-talk For Superconducting Qubits |

316 | Implementing optimized time-varying coupling and dissipation in small logical qubit architectures. | Rodriguez Perez, David; Kapit, Eliot | Optimal device and signal parameters for the VSLQ are well understood for a numerically optimized, continuous coupling strength, so we explore the effects of using an optimized, time-varying coupling strength between the primary qubits and shadow resonators and report a best possible scaling logical qubit lifetime T L that scales as T 1 2, where T 1 is the lifetime for a single primary qubit. | Session 20: Multi-Qubit Characterizations and Cross-talk For Superconducting Qubits |

317 | Fault-tolerant quantum computation with few qubits | Reichardt, Ben | We give space-efficient methods for fault-tolerant error correction and computation. | Session 21: New Avenues for Quantum Error Correction |

318 | New prospects for fault-tolerant quantum error correction with biased-noise cat-qubits | Puri, Shruti | I will show how this challenge can be overcome by using the so called stabilized cat-qubits in a parametrically driven non-linear oscillators. I will also present a set of other bias-preserving operations that can be performed with the stabilized cat-qubit. | Session 21: New Avenues for Quantum Error Correction |

319 | Experimental quantum error correction with binomial bosonic codes | Sun, Luyan; Hu, Ling; Ma, Yuwei; Cai, Weizhou; Mu, Xianghao; Xu, Yuan; Weiting, Wang; Wu, Yukai; Wang, Haiyan; Song, Yipu; Zou, Chang-Ling; Girvin, Steven; Duan, Luming | In this talk, I will discuss our recent experimental efforts [1] toward both the repetitive QEC using a binomial bosonic code in a circuit quantum electrodynamics architecture and full control on the logical qubit. | Session 21: New Avenues for Quantum Error Correction |

320 | Scalable quantum error correction with the bosonic GKP code | Terhal, Barbara; Pryadko, Leonid; Weigand, Daniel; Wang, Yang; Asasi, Hamed; Vuillot, Christophe | We propose a scalable architecture which uses a surface code on top of the GKP qubits. | Session 21: New Avenues for Quantum Error Correction |

321 | Encoding and controlling a GKP logical qubit in a trapped-ion oscillator | Home, Jonathan | I will describe trapped-ion experiments in which we encode a logical qubit using the motion of a single trapped ion. | Session 21: New Avenues for Quantum Error Correction |

322 | Quantum Computing in the NISQ era and beyond | Preskill, John | Quantum Computing in the NISQ era and beyond | Session 22: Noisy Intermediate-Scale Quantum Computers |

323 | Advances in quantum simulation on the path towards post-supremacy, pre-fault-tolerant applications | McClean, Jarrod | In this talk I will discuss some of these challenges and recent advances in both the algorithms for simulating these problems with lower overheads and mitigating some of these difficulties directly. | Session 22: Noisy Intermediate-Scale Quantum Computers |

324 | Simple tricks to squeeze more out of your noisy quantum device | Temme, Kristan | In this talk we will present our advances in the search for quantum algorithms for noisy quantum computers that may be relevant to problems in quantum simulation and quantum machine learning. | Session 22: Noisy Intermediate-Scale Quantum Computers |

325 | Photonic quantum networks | Walmsley, Ian | Photonic quantum networks | Session 22: Noisy Intermediate-Scale Quantum Computers |

326 | Scaling Ion-trap Quantum Computing | Ringbauer, Martin | In this presentation I will present recent work on investigating the performance of the Innsbruck-based ion-trap quantum computer as the quantum register size increases, provide an ongoing project to extend quantum error correction capabilities including loss and outline changes to the apparatus to push towards a 20-qubit quantum processor with parallel processing capabilities. | Session 22: Noisy Intermediate-Scale Quantum Computers |

327 | Beyond the transmon: A new generation of superconducting qubits | Schuster, David | Beyond the transmon: A new generation of superconducting qubits | Session 23: Novel Superconducting Qubits: Intrinsic Protection and Bath Engineering |

328 | Entanglement and complexity of interacting transmon qubits subject to asymmetric noise | Kapit, Eliot | We show that this problem is likely to be harder to simulate than the isolated chain, and that it can achieve volume-law entanglement even in the strong noise limit (likely persisting up to system sizes beyond the scope of classical simulation). | Session 23: Novel Superconducting Qubits: Intrinsic Protection and Bath Engineering |

329 | Superconducting Gatemon Qubit based on a Proximitized Two-Dimensional Electron Gas | Casparis, Lucas; Connolly, Malcolm; Kjærgaard, Morten; Pearson, Natalie; Kringhøj, Anders; Larsen, Thorvald; Kuemmeth, Ferdinand; Wang, Tian; Thomas, Candice; Gronin, Sergei; Gardner, Geoffrey; Manfra, Michael; Marcus, Charles; Petersson, Karl | Here, we go beyond proof-of-concept and demonstrate that semiconducting channels etched from a wafer-scale two-dimensional electron gas (2DEG) are a suitable platform for building a scalable gatemon-based quantum computer [3]. | Session 23: Novel Superconducting Qubits: Intrinsic Protection and Bath Engineering |

330 | Quantum computing with driven-dissipative Josephson circuits | Leghtas, Zaki | The goal of this research is to reduce this overhead, and our approach is based on two key ideas. | Session 23: Novel Superconducting Qubits: Intrinsic Protection and Bath Engineering |

331 | A programmable superconducting quantum processor with three all-to-all coupled qubits | Roy, Tanay; Hazra, Sumeru; Kundu, Suman; Chand, Madhavi; Bhattacharjee, Anirban; Salunkhe, Kishor; Patankar, Meghan; Damle, Kedar; Vijayaraghavan, Rajamani | In this talk, I will introduce “trimon” [1], a three-qubit device based on a multi-mode superconducting circuit providing strong inter-qubit coupling and access to three-qubit native gates. | Session 23: Novel Superconducting Qubits: Intrinsic Protection and Bath Engineering |

332 | The quantum computing stack: From quantum algorithms to optimized resource estimates | Haener, Thomas; Steiger, Damian; Troyer, Matthias | In this talk, I will discuss how software for quantum computing can support researchers in carrying out such analyses. | Session 24: Programming and Compilation — the Quantum Computing Stack |

333 | Automatic Compilation for Portable and Scalable Quantum Software | Smith, Robert; Peterson, Eric | We discuss how automatic compilation helps achieve these simultaneous goals more consistently, and compare results of an open-source, extensible automatic compiler quilc to semi-manual counterparts. | Session 24: Programming and Compilation — the Quantum Computing Stack |

334 | Compiler tools for hybrid quantum-classical algorithms | Karalekas, Peter; Tezak, Nikolas; Capelluto, Lauren; Peterson, Eric; Smith, Robert; Suska, Mark; Mocarski, Adam; Brown, Stephan; Tanguay, Celena; Sinclair, Rodney; Taie-Nobarie, Nima; Song, Chloe; Turkowski, Stefan; Rust, Michael; Jones, Glenn; Fried, Schuyler; Scarabelli, Diego; Abrams, Deanna; Caldwell, Shane; Ryan, Colm; Sivarajah, Prasahnt; Zeng, William; Johnson, Blake; Rigetti, Chad | We describe the Rigetti compilation toolchain and in particular how it supports optimized implementations of certain hybrid quantum-classical algorithms. We provide quantitative benchmarks of the improved wall-clock performance. | Session 24: Programming and Compilation — the Quantum Computing Stack |

335 | Quantum Circuit Compilation to NISQ processors | Rieffel, Eleanor; Venturelli, Davide | We describe automated reasoning approaches for QCC-NISQ, quantum circuit compilation to NISQ (noisy intermediate-scale quantum) processor architectures. | Session 24: Programming and Compilation — the Quantum Computing Stack |

336 | Less than a million CNOTs should be enough to solve a classically intractable instance of a scientific problem with a quantum circuit | Maslov, Dmitri | The problem I consider is Hamiltonian dynamics simulation, in the sense of the ability to sample probability distribution given by a state evolved under the target Hamiltonian for a specified time t and accurate to within a specified error epsilon. | Session 24: Programming and Compilation — the Quantum Computing Stack |

337 | Overview and Comparison of Gate Level Quantum Software Platforms | LaRose, Ryan | In this paper, we provide a current picture of the rapidly evolving quantum computing landscape by comparing four software platforms–Forest (pyQuil), QISKit, ProjectQ, and the Quantum Developer Kit–that enable researchers to use real and simulated quantum devices. | Session 24: Programming and Compilation — the Quantum Computing Stack |

338 | A case study for quantum software development: Linear systems solver | Gukelberger, Jan; Roetteler, Martin; Troyer, Matthias | A key point in this work has been the handling of arithmetic functions: Gate synthesis facilitates accurate resource counts and is a requisite for deployment to quantum hardware, whereas emulation by the classical simulator allows for software testing on larger systems. | Session 24: Programming and Compilation — the Quantum Computing Stack |

339 | Two-step approach to scheduling quantum circuits | Guerreschi, Gian Giacomo; Park, Jongsoo | Here we present a two-step approach in which logical gates are initially scheduled neglecting connectivity considerations and routing operations are added at a later step in ways that minimize their overhead. | Session 24: Programming and Compilation — the Quantum Computing Stack |

340 | Real-time randomized compilation of quantum algorithms | Ribeill, Guilhem; Ware, Matthew; Donovan, Brian; Govia, Luke | Here, we demonstrate an in hardware implementation of PFR on the BBN Arbitrary Pulse Sequencer II that generates randomized sequences in real-time. | Session 24: Programming and Compilation — the Quantum Computing Stack |

341 | SKQuant-Opt: Optimizers for Noisy Intermediate-Scale Quantum Devices | Lavrijsen, Wim; Tudor, Ana; Larson, Jeffrey; Sung, Kevin; Linder, Lucy; Mueller, Juliane; McClean, Jarrod; Babbush, Ryan; Urbanek, Miroslav; Iancu, Costin; De Jong, Wibe | We present skquant-opt, part of scikit-quant.org, a set of optimizers tuned for the needs of NISQ. | Session 24: Programming and Compilation — the Quantum Computing Stack |

342 | Benchmarking coherent Ising machines and quantum annealers with MAX-CUT and SK problems | Hamerly, Ryan; Inagaki, Takahiro; McMahon, Peter; Venturelli, Davide; Marandi, Alireza; Onodera, Tatsuhiro; Ng, Edwin; Rieffel, Eleanor; Fejer, Martin; Mabuchi, Hideo; Utsunomiya, Shoko; Takesue, Hiroki; Yamamoto, Yoshihisa | We benchmark the performance of two types of physical annealing machines — coherent Ising machines (CIMs) built from coupled optical parametric oscillators, and a commercial quantum annealer (QA) by D-Wave Systems — on a range of NP-hard Ising problems including MAX-CUT and ground-state computation of Sherrington-Kirkpatrick (SK) spin glasses. | Session 25: Quantum Annealing: Algorithms and Applications |

343 | Benchmarking Portfolio Selection with Adiabatic Quantum Optimization | Grant, Erica; Humble, Travis; Elsokkary, Nada; Khan, Faisal; Quiroz, Greg | Markowitz portfolio theory strategically uses correlated behaviors between assets to mitigate financial risk, which we formulate as a quadratic unconstrained binary optimization problem with frustrated stoquastic form. | Session 25: Quantum Annealing: Algorithms and Applications |

344 | Circuit fault diagnosis using quantum annealing and other spin glass solvers | Reid, Brendan; Crosson, Elizabeth; Hen, Itay | In this work we present a novel approach to solving circuit fault diagnosis (CFD) problems using quantum annealers and other spin glass solvers, such as simulated annealing and parallel tempering. | Session 25: Quantum Annealing: Algorithms and Applications |

345 | Forward-reverse error mitigation algorithm for quantum annealers | Ezzell, Nic; Novotny, Mark | We propose a novel way to try to improve ground-state sampling statistics on quantum annealers with no cost in ancilla qubits—“forward-reverse error mitigation” (FREM) sampling. | Session 25: Quantum Annealing: Algorithms and Applications |

346 | Minor embedding: an application in quantum annealing | Fang, Yan-Long; Severini, Simone; Warburton, Paul | We have developed a new method for determining tighter bounds on this magnitude, which in turn should result in fewer errors from thermal noise. | Session 25: Quantum Annealing: Algorithms and Applications |

347 | Performance Improvement of a Quantum Annealer Using Optimized Quantum Control | Quiroz, Gregory | Specifically, we employ closed-loop control optimization protocols based on stochastic gradient ascent and Bayesian optimization to optimize QPU performance. | Session 25: Quantum Annealing: Algorithms and Applications |

348 | Quantum magnetism on a chip | Harris, Richard | This lecture will provide a brief review of the aforementioned results and an update on related experiments. | Session 25: Quantum Annealing: Algorithms and Applications |

349 | Reverse Quantum Annealing on D-Wave 2000Q | Venturelli, Davide | We review results to date obtained by the usage of the quantum reverse annealing feature introduced in the latest model of the D-Wave machine – especially comparatively with forward annealing protocols. | Session 25: Quantum Annealing: Algorithms and Applications |

350 | Quantum Annealing XORSAT on Dilute Square Lattices | Patil, Pranay; Chamon, Claudio; Kourtis, Stefanos; Ruckenstein, Andrei; Mucciolo, Eduardo | We explore ways to avoid two potential obstacles that limit how fast one can anneal this system; the first is the nature of the phase transition as we tune the transverse field and the second is the avoided level crossings for small transverse field strength. | Session 25: Quantum Annealing: Algorithms and Applications |

351 | Solution planting scheme for fully-connected spin glasses | Pattison, Christopher; Hamze, Firas; Raymond, Jack; Katzgraber, Helmut | Here we present a method for planting solutions in fully-connected spin-glass systems with tunable hardness. | Session 25: Quantum Annealing: Algorithms and Applications |

352 | Testing the D-Wave 2000Q as a quantum Monte Carlo simulator | Gonzalez Izquierdo, Zoe; Hen, Itay; Albash, Tameem | Here we will present the results of our work along with some interesting conclusions. | Session 25: Quantum Annealing: Algorithms and Applications |

353 | Theoretical survey of unconventional quantum annealing methods applied to a difficult trial problem | Tang, Zhijie; Kapit, Eliot | In our work, we define an artificial trial problem inspired by “transverse field chaos” in larger systems where classical and quantum methods are steered toward a local false minimum and the minimum gap to the true ground state is exponentially small. | Session 25: Quantum Annealing: Algorithms and Applications |

354 | A proposed superconducting circuit quantum annealer with fully programmable all-to-all coupling | McMahon, Peter; Onodera, Tatsuhiro; Ng, Edwin | We propose a novel architecture for a superconducting circuit quantum annealer that requires only N physical qubits to realize N logical qubits, and present analytical and numerical evidence that fully connected and programmable quantum annealers with N=1000 logical qubits can be constructed with technology that requires only modest improvements over what currently exists. | Session 26: Quantum Annealing: Architectures |

355 | Coherent oscillations in the annealing of a flux qubit | Khezri, Mostafa; Chen, Huo; Munoz Bauza, Humberto; Lidar, Daniel | We study how these characteristics appear in a multi-level superconducting flux qubit by mapping the Ising coefficients to qubit control fluxes. | Session 26: Quantum Annealing: Architectures |

356 | Modeling Coherent Oscillations in the Ground State Probability of Annealed Qubits | Munoz-Bauza, Humberto; Chen, Huo; Khezri, Mostafa; Lidar, Daniel | We propose and characterize classes of anneal schedules that exhibit experimentally accessible oscillations as signatures of quantum coherence of a qubit, presenting both time-dependent perturbation theoretic analysis and open system results. | Session 26: Quantum Annealing: Architectures |

357 | Coupling annealing-capable high-coherence flux qubits | Disseler, Steven; Basham, James; Grover, Jeffrey; Novikov, Sergey; Ferguson, David; Stegen, Zachary; Marakov, Alexander; Kim, David; Melville, Alexander; Niedzielski, Bethany; Yoder, Jonilyn; Hinkey, Robert; Lidar, Daniel; Zick, Kenneth | Using systems of two and three fully-connected qubits, we demonstrate controllable, scalable couplings between the Z-like fields of individual qubits. | Session 26: Quantum Annealing: Architectures |

358 | Development of a Scalable Annealing Machine Dedicated to Integer Factoring | Koike, Hanpei; Imafuku, Kentaro; Kawabata, Shiro | We have developed a scalable classical ASAC machine using commercial electronic components as a proof of concept. | Session 26: Quantum Annealing: Architectures |

359 | Fluxonium Qubit Systems for Coherent Quantum Annealing | Vavilov, Maxim; Qi, Zhenyi; Dykman, Mark; Manucharyan, Vladimir | In this talk, we describe the multiqubit tunneling in the system of strongly coupled fluxonium qubits during annealing. | Session 26: Quantum Annealing: Architectures |

360 | Flux qubit readout at the degeneracy point | Schöndorf, Marius; Lupascu, Adrian; Wilhelm, Frank | In this work we present an indirect measurement scheme for flux qubits which works at arbitrary bias points, most interesting also at the degeneracy point. | Session 26: Quantum Annealing: Architectures |

361 | High coherence annealing, Part 1: fast, high-fidelity readout | Basham, James; Grover, Jeffrey; Disseler, Steven; Novikov, Sergey; Ferguson, David; Stegen, Zachary; Marakov, Alexander; Hinkey, Robert; Khalil, Moe; Kim, David; Melville, Alexander; Niedzielski, Bethany; Yoder, Jonilyn; Przybysz, Anthony; Lidar, Daniel; Zick, Kenneth | We report experimental results of a persistent current readout scheme that provides fast readout while isolating the qubit from the resonator during the anneal. | Session 26: Quantum Annealing: Architectures |

362 | High coherence annealing, Part 2: fast annealing experiments | Grover, Jeffrey; Basham, James; Disseler, Steven; Novikov, Sergey; Ferguson, David; Stegen, Zachary; Marakov, Alexander; Kim, David; Melville, Alexander; Niedzielski, Bethany; Yoder, Jonilyn; Hinkey, Robert; Khalil, Moe; Lidar, Daniel; Zick, Kenneth | We study the behavior of the qubit transition width by changing the annealing time, and we use excited state readout to determine other parameters of the system. | Session 26: Quantum Annealing: Architectures |

363 | High-order and long-range connectivity for embedding problems in quantum annealing with superconducting flux qubits | Melanson, Denis; Martinez, Antonio; Yurtalan, Muhammet Ali; Tang, Yongchao; Kim, David; Melville, Alexander; Niedzielski, Bethany; Yoder, Jonilyn; Novikov, Sergey; Mozgunov, Evgeny; Lidar, Daniel; Lupascu, Adrian | An approach for implementing high connectivity in superconducting flux qubit annealers was proposed in which the qubits are connected via chains of rf-SQUID couplers. We report an application of this concept in building problem-specific annealing architectures with high-order connectivity. | Session 26: Quantum Annealing: Architectures |

364 | Multi-body flux-qubit couplers for quantum annealing | Consani, Gioele; Warburton, Paul; Al Sharif, Nedeen | Here we present a comparative analysis of a few such proposed implementations and propose a quantitative way to compare their performances, with specific focus on their possibility to generate the correct quantum energy spectrum during the annealing process. | Session 26: Quantum Annealing: Architectures |

365 | Parity measurement via ancillary RF-SQUIDs for superconducting flux qubit quantum annealers | Martinez, Antonio; Melanson, Denis; Tennant, Daniel; Tang, Yongchao; Novikov, Sergey; Disseler, Steven; Basham, James; Grover, Jeffrey; Marakov, Alexander; Stegen, Zachary; Lupascu, Adrian | We propose a device to do parity measurements in quantum annealers based on flux qubits. | Session 26: Quantum Annealing: Architectures |

366 | Quantum annealing with mediated interactions: from a perturbative to a ultrastrong mediated coupling. | Pino Garcia, Manuel; Garcia-Ripoll, Juan Jose | We present a study of a quantum annealer where bosons mediate the Ising-type interactions between qubits. | Session 26: Quantum Annealing: Architectures |

367 | Schrieffer-Wolff Methods for Interacting Superconducting Qubits | Magyar, Rudolph; Ferguson, David | In this talk, we report a method based on the Bravyi et al Schrieffer-Wolff transformation [1] that provides a Pauli decomposition with the following desirable properties: (i) the effective Hamiltonian remains block diagonal so that the computational subspace is completely decoupled from the non-computational states, (ii) the adiabatic connection terms generated by the time dependence of the computational subspace are block off-diagonal and thus do not generate any terms within the computational subspace, and (iii) the computational subspace has a non-trivial holonomy over the control parameter manifold. | Session 26: Quantum Annealing: Architectures |

368 | Superconducting Quantum Annealing Architecture with LC Resonators | Tomonaga, Akiyoshi; Mukai, Hiroto; Tsai, Jaw-Shen | We report on the architecture and experimental results of superconducting quantum annealer with LC resonator. | Session 26: Quantum Annealing: Architectures |

369 | Adaptive quantum annealing based on weak measurements to suppress the errors due to Landau-Zener transitions | Tang, Yongchao; Martinez, Antonio; Zhang, Song; Atalaya, Juan; Whaley, Birgitta; Lupascu, Adrian | We study the relationship between the minimum gap and potential observables that can be used to gain information on the minimum gap using weak measurements. | Session 27: Quantum Annealing: Theory |

370 | Feedback control of a monitored system evolving adiabatically | Yip, Ka Wa; Lidar, Daniel | We devised a quantum feedback control method to reverse the effect of thermal excitation. | Session 27: Quantum Annealing: Theory |

371 | Many-body quantum systems provide a mechanism for robust and efficient quantum search | Kechedzhi, Kostyantyn; Smelyanskiy, Vadim; Faoro, Lara; Boixo, Sergio; Neven, Hartmut; Ioffe, Lev; Altshuler, Boris | We demonstrate this novel intermittency in a “wide band” impurity model with a bi-modal classical density of states with a delta-peak at zero energy containing most states and the second peak containing an exponentially smaller number of states lying at low energy. | Session 27: Quantum Annealing: Theory |

372 | Control of Phase Transitions in Wajnflasz–Pick model | Seki, Yuya; Tanaka, Shu; Kawabata, Shiro | Adding a driver Hamiltonian that causes spin flip and state transitions within upper and lower states to the Hamiltonian of classical Wajnflasz–Pick model, we construct the quantum model where phase transitions are controllable. | Session 27: Quantum Annealing: Theory |

373 | Energy gap scaling of quantum annealing based on Wajnflasz–Pick model | Watabe, Shohei; Seki, Yuya; Kawabata, Shiro | In this study, in order to confirm their claim, we revisit the energy gap of the finite size Wajnflasz–Pick model with all-to-all random interaction. | Session 27: Quantum Annealing: Theory |

374 | Assessing the Quantum in Quantum Annealing | DeGottardi, Wade; Ferguson, David; Novikov, Sergey; Chen, Huo; Lidar, Daniel | Our approach to this problem utilizes the theory of quantum distributions on phase space and focuses on the specific non-linear dynamics that arise in Josephson junction circuits. | Session 27: Quantum Annealing: Theory |

375 | Adiabatic quantum computation with effective Hamiltonians | Goto, Hayato; Kanao, Taro | Based on this difference, here we propose a method to improve the performance of bifurcation-based AQC, which is not applicable to standard AQC using real Hamiltonians. | Session 27: Quantum Annealing: Theory |

376 | Parameter setting for quantum annealing | Di Gioacchino, Andrea; Mandra, Salvatore; Rieffel, Eleanor | In this talk I will focus on the parameter setting problem, that is how to find the optimal weights to be used in penalty terms, as well as the values of the ferromagnetic couplings to be used in the minor embedding problem. | Session 27: Quantum Annealing: Theory |

377 | Predicting the behavior of analog quantum annealers with statistical learning | Lokhov, Andrey; Kharkov, Yaroslav; Coffrin, Carleton; Vuffray, Marc | Here, we uncover the probabilistic relation between input and output of quantum annealers using the novel rigorous statistical learning tools. | Session 27: Quantum Annealing: Theory |

378 | Quantum annealing and thermalization: insights from integrability | Li, Fuxiang; Sinitsyn, Nikolai; Chernyak, Vladimir | We solve a model that has basic features that {are desired for quantum annealing computations: entanglement in the ground state,} controllable annealing speed, ground state energy separated by a gap during the whole evolution, and programmable computational problem that is encoded by parameters of the Ising part of the spin Hamiltonian. | Session 27: Quantum Annealing: Theory |

379 | The computational complexity of optical quantum annealers and Ising machines | Pooser, Raphael; Bennnk, Ryan | Here, we present a study of three different computational models based on physics of increasing complexity. We present benchmarks of each model and outline their relative capability to capture the relevant physics responsible for practical computation in OIMs. | Session 27: Quantum Annealing: Theory |

380 | The power of pausing: advancing understanding of thermalization in experimental quantum annealers | Marshall, Jeffrey; Venturelli, Davide; Hen, Itay; Rieffel, Eleanor | We investigate annealing schedules involving an intermediate pause, on the current generation of quantum annealing hardware: the D-Wave 2000Q. | Session 27: Quantum Annealing: Theory |

381 | Understanding the Role of Non-stoquastic Catalysts in Quantum Adiabatic Optimization | Albash, Tameem | We provide details on how the non-stoquastic catalyst provides an advantage in these models. | Session 27: Quantum Annealing: Theory |

382 | Gap-independent cooling and hybrid quantum-classical annealing (HQCA) | Theis, Lukas; Schuhmacher, Peter; Marthaler, Michael; Wilhelm, Frank | We present an efficient gap-independent cooling scheme for a quantum annealer that benefits from finite temperatures. | Session 27: Quantum Annealing: Theory |

383 | Enhancing quantum adiabaticity in adiabatic quantum computers with multiple local minima | Tian, Lin | In this talk, we show that this approach can be applied to adiabatic quantum computers with multiple local minima in the energy separation between the ground and the excited states. We demonstrate this approach with numerical simulation. [1] L. Tian, arXiv:1802.02285. | Session 27: Quantum Annealing: Theory |

384 | Dynamics of Quantum Photocells Driven by Periodic or Stochastic Photon Pulses | Oh, Sangchul | We investigate the dynamics of a quantum photocell as a quantum heat engine, driven by external photon pulses. | Session 28: Quantum Computing with Open Quantum Systems |

385 | Coherent fluctuation relations: from the abstract to the concrete | Holmes, Zoe; Weidt, Sebastian; Jennings, David; Anders, Janet; Mintert, Florian | To explicate the physical origins and implications of such corrections, we here convert an abstract framework of an autonomous quantum Crooks relation into quantum Crooks equalities for well-known coherent, squeezed and cat states. | Session 28: Quantum Computing with Open Quantum Systems |

386 | How nonequlibriumness influences macroscopic realism through Leggett-Garg inequality? | Zhang, Kun; Wang, Jin | We study the macroscopic realism through Leggett-Garg inequality (LGI) for a two-qubit quantum system coupled with two environments characterized by either the bosonic (thermal and photonic) baths or fermionic (electronic) baths with different temperatures or chemical potentials respectively. | Session 28: Quantum Computing with Open Quantum Systems |

387 | Discord vs Distortion: Classical vs Quantum | Sanders, Barry; Zhang, Wei-Wei; Sanders, Yuval; Arshed, Nigum | Here we present mathematical relations, and specifically monotonicity between discord and channel-distortion measures such as mean-squared distortion and Kullback-Leibler divergence. | Session 28: Quantum Computing with Open Quantum Systems |

388 | Information-theoretic aspects of the generalized amplitude damping channel | Khatri, Sumeet; Sharma, Kunal; Wilde, Mark | In this work, we provide an information-theoretic characterization and analysis of the generalized amplitude damping channel (GADC), which is the qubit analogue of the bosonic thermal loss channel. | Session 28: Quantum Computing with Open Quantum Systems |

389 | Superadditivity and boosting coherent information using useless channels | Siddhu, Vikesh | We extend their results to a larger class of channels with qubit inputs and some channels with qutrit inputs. | Session 28: Quantum Computing with Open Quantum Systems |

390 | Consequences of measurement back-action from quantum monitoring: non-standard speed limits and spontaneous symmetry breaking | Garcia-Pintos, Luis Pedro; Tielas, Diego; del Campo, Adolfo | We present consequences of such measurement back-action to two problems in quantum theory: the limits to the speed of evolution, and the process of spontaneous symmetry breaking. | Session 28: Quantum Computing with Open Quantum Systems |

391 | Characterizing Initial Correlations via Spectroscopy | Jatakia, Parth; Vinjanampathy, Sai; Saha, Kasturi | Taking inspiration from correlated spectroscopy, we demonstrate a method to determine the correlation between the system and the environment. | Session 28: Quantum Computing with Open Quantum Systems |

392 | Quantum Forking for Open Quantum Systems Simulation | RHEE, June-Koo(KEVIN); Sinayskiy, Ilya; Park, Daniel Kyungdeock; Petruccione, Francesco | Here we introduce quantum information forking that allows an array of qubits to undergo independent processes in superposition to reduce the number of the state initialization procedure. | Session 28: Quantum Computing with Open Quantum Systems |

393 | Experimental Test of Decoherence Theory using Electron Matter Waves | Beierle, Peter; Zhang, Liyun; Chen, Zilin; Wagner, Hans Peter; Batelaan, Herman | Here we present these findings and progress towards monitoring the environment using space-time resolved optical methods [2], with the aim to study if we can also measure the loss of coherence of the environment induced by the free electron. | Session 28: Quantum Computing with Open Quantum Systems |

394 | Using a Shot Noise Junction to Characterize a Josepheson Travelling Wave Parametric Amplifier | Epstein, Jacob; McElroy, Kyle; Spietz, Lafe; Sweeney, Timothy; Aumentado, Jose; Hoffmann, Joan | Using a Shot Noise Junction to Characterize a Josepheson Travelling Wave Parametric Amplifier | Session 28: Quantum Computing with Open Quantum Systems |

395 | Stabilization of cavity Hilbert subspaces in cavity quantum electrodynamics by measurement-based quantum feedback | Berube-Lauziere, Yves; Azouit, Rémi | Stabilization of cavity Hilbert subspaces in cavity quantum electrodynamics by measurement-based quantum feedback | Session 28: Quantum Computing with Open Quantum Systems |

396 | Ground state cooling in the strong-coupling regime | Kow, Chung; Tureci, Hakan; Metelmann, Anja; Kamal, Archana | Here we present a novel approach using dissipation engineering that mitigates normal-mode splitting between the system and the bath, while preserving strong coupling between the two. | Session 28: Quantum Computing with Open Quantum Systems |

397 | Engineered Dissipation as Your Side-kick: A Hybrid Scheme for Quantum Error Correction. | Kristensen, Lasse; Kjærgaard, Morten; Andersen, Christian Kraglund; Zinner, Nikolaj | In this talk, we present a scheme that combine these ideas with traditional measurement-based error correction into a 6-qubit hybrid scheme capable of protecting qubits from photon-loss and dephasing errors, achieving 10-fold improvements in dephasing times and 5-fold improvements to relaxation times for realistic superconducting-qubit parameters and noise while employing only relatively simple local 2-qubit interactions. | Session 28: Quantum Computing with Open Quantum Systems |

398 | Quantum dynamics and fluctuating Hamiltonians: controlling many-body decoherence | Chenu, Aurelia; Saxena, Avadh; Del Campo, Adolfo | I will present a versatile scheme for the quantum simulation of the open dynamics of a many-body system embedded in an environment to which it couples via arbitrary many-body interactions. | Session 29: Quantum Control of Open and Tracked Quantum Systems |

399 | Gradient-based optimal control of open systems using quantum trajectories and automatic differentiation | Abdelhafez, Mohamed; Schuster, David; Koch, Jens | We present a gradient-based optimal-control technique for open quantum systems that utilizes quantum trajectories. | Session 29: Quantum Control of Open and Tracked Quantum Systems |

400 | Dissipative self-interference and robustness of continuous error-correction to miscalibration | Albert, Victor; Noh, Kyungjoo; Reiter, Florentin | We derive an effective equation of motion within the steady-state subspace of a large family of Markovian open systems (i.e., Lindbladians) subject to perturbations of their Hamiltonians and system-bath couplings [1]. | Session 29: Quantum Control of Open and Tracked Quantum Systems |

401 | A Quantum Law of Requisite Variety | Girolami, Davide | I here extend it to the quantum domain, establishing information-theoretic limits to the controllability of open quantum systems in terms of the resources available to the controller, quantum coherence and correlations. | Session 29: Quantum Control of Open and Tracked Quantum Systems |

402 | Conditions allowing error correction in driven qubits | Throckmorton, Robert | We consider a qubit that is driven along its logical z axis, with noise along the z axis in the driving field ? proportional to some function f(?), as well as noise along the logical x axis. We provide sets of parameters that correct for errors for various rotations and evaluate the error, measured by the infidelity, for the corrected rotations versus the naive rotations. | Session 29: Quantum Control of Open and Tracked Quantum Systems |

403 | Parametrically-mediated Dissipative Entanglement Generation | Doucet, Emery; Reiter, Florentin; Ranzani, Leonardo; Simmonds, Raymond; Aumentado, Jose; Kamal, Archana | In this talk, I will present a novel scheme which makes use of parametric qubit-qubit and qubit-resonator interactions to avoid this issue. | Session 29: Quantum Control of Open and Tracked Quantum Systems |

404 | To catch and reverse a quantum jump mid-flight | Minev, Zlatko; Mundhada, Shantanu; Shankar, Shyam; Reinhold, Philip; Guttierez, Ricardo; Schoelkopf, Robert; Mirrahimi, Mazyar; Carmichael, Howard; Devoret, Michel | We have successfully caught and reversed jumps by implementing the indirect QND measurement of a superconducting artificial atom that undergoes a transition from its ground state G to a dark state D. | Session 29: Quantum Control of Open and Tracked Quantum Systems |

405 | Adaptive Rotating-Wave Approximation for Driven Open Quantum Systems | Baker, Brian; C. Y. Li, Andy; Irons, Nicholas; Earnest, Nathan; Koch, Jens | In this talk, I will present a numerical method to approximate the long-time asymptotic solution ? ?(t) to the Lindblad master equation for an open quantum system under the influence of an external drive. | Session 29: Quantum Control of Open and Tracked Quantum Systems |

406 | Exploring topological features of a dissipative qubit near an exceptional point | Abbasi, Maryam; Naghiloo, Mahdi; Joglekar, Yogesh; Murch, Kater | We study the behavior of a single dissipative qubit which is described by a non-Hermitian Hamiltonian that has effective space-time reflection (PT) symmetry. | Session 29: Quantum Control of Open and Tracked Quantum Systems |

407 | Experimental repetitive quantum channel simulation | Cai, Weizhou; Ling, Hu; Mu, Xianghao; Ma, Yuwei; Xu, Yuan; Wang, Haiyan; Song, Yipu; Zou, Chang-Ling; Sun, Luyan | Here, we experimentally simulate arbitrary quantum channels for an open quantum system, i.e. a single photonic qubit in a superconducting quantum circuit. | Session 29: Quantum Control of Open and Tracked Quantum Systems |

408 | Measurement-induced phase transition in the dynamics of entanglement | Skinner, Brian; Ruhman, Jonathan; Nahum, Adam | We study the dynamics of quantum entanglement in a many-body system that undergoes unitary evolution punctuated by projective measurements. | Session 29: Quantum Control of Open and Tracked Quantum Systems |

409 | Controling the dynamics across a quantum phase transition | Del Campo, Adolfo; Garcia-Pintos, Luis Pedro; Tielas, Diego; Gómez-Ruiz, Fernando | We shall present theoretical and experimental progress based on these approaches. | Session 29: Quantum Control of Open and Tracked Quantum Systems |

410 | Quantum Tracking Control of Molecular Rotor Orientation is Singularity-free | Magann, Alicia; Ho, Tak-San; Rabitz, Herschel | In this talk I will consider a planar molecular rotor and derive singularity-free expressions for the fields that steer the expectation value of the rotor’s orientation along desired trajectories in time. | Session 29: Quantum Control of Open and Tracked Quantum Systems |

411 | Fault-tolerant magic state preparation with flag qubits | Chamberland, Christopher; Cross, Andrew | In this talk I will present a new scheme for preparing magic states with very low overhead that uses flag qubits. | Session 30: Quantum Error Correction Theory and Experiment |

412 | Error correcting Bacon-Shor code with continuous measurement of non-commuting operators | Atalaya, Juan; Korotkov, Alexander; Whaley, Birgitta | We analyze the nine-qubit Bacon-Shor code (smallest Bacon-Shor code capable of correcting any single-qubit error) with simultaneous continuous measurement of non-commuting gauge operators. | Session 30: Quantum Error Correction Theory and Experiment |

413 | Quantum Error Correction with the Semion Code | Dauphinais, Guillaume; Ortiz, Laura; Varona, Santiago; Martin-Delgado, Miguel Angel | We present a full quantum error correcting procedure with the semion code: an off-shell extension of the double semion model. | Session 30: Quantum Error Correction Theory and Experiment |

414 | Disjointness in quantum error correction: Imposing limitations on logical gates | Jochym-O’Connor, Tomas; Yoder, Theodore; Kubica, Aleksander | I will introduce the notion of disjointness for stabilizer codes in quantum error correction and discuss its implications for implementing fault-tolerant logical gates. | Session 30: Quantum Error Correction Theory and Experiment |

415 | Stabilizer Slicing: Coherent Error Cancellations in LDPC Codes | Debroy, Dripto; Li, Muyuan; Newman, Michael; Brown, Kenneth | In this paper we propose a scheme to cancel coherent overrotation errors when implementing quantum error correcting codes. | Session 30: Quantum Error Correction Theory and Experiment |

416 | Continuous Quantum Error Correction with two-qubit Annealing Hamiltonian | BABAKHANI, ARMAN; Chan, Herman; Epstein, Jeffrey; Zhang, Song; Atalaya, Juan; Whaley, Birgitta | Using an open quantum system approach, we study the effects of different noise models such as bit-flip errors and more realistic thermal noise on a two-qubit system evolving under an annealing Hamiltonian. | Session 30: Quantum Error Correction Theory and Experiment |

417 | Neural Belief-Propagation Decoders for Quantum Error-Correcting Codes | Liu, Ye-Hua; Poulin, David | Inspired by an exact mapping between BP and deep neural networks, we train neural BP decoders for quantum low-density parity-check codes, with a loss function tailored for the quantum setting. | Session 30: Quantum Error Correction Theory and Experiment |

418 | Demonstration of Channel-Optimized Quantum Error Correction on Cloud-Based Quantum Computers | Zhang, Haimeng; Leipold, Hannes; Kosut, Robert; Lidar, Daniel | Our goal is to protect quantum states from noise. | Session 30: Quantum Error Correction Theory and Experiment |

419 | Demonstration of fidelity improvement using dynamical decoupling with superconducting qubits | Pokharel, Bibek; Anand, Namit; Fortman, Benjamin; Lidar, Daniel | Here, using the IBM and Rigetti platforms, we demonstrate that the DD method is suitable for implementation in today’s relatively noisy and small-scale cloud-based quantum computers. | Session 30: Quantum Error Correction Theory and Experiment |

420 | A family of subsystem codes with only weight two operators | Marvian, Milad | We introduce a family of subsystem codes with the property that their gauge operators, single qubit logical operators and also the product of any two logical operators of the same type can all be implemented using two-local interactions. | Session 30: Quantum Error Correction Theory and Experiment |

421 | Higher-dimensional quantum hypergraph-product codes | Zeng, Weilei; Pryadko, Leonid | We describe a family of quantum error-correcting codes which generalize both the quantum hypergraph-product (QHP) codes by Tillich and Zémor, and all families of toric codes on m-dimensional hypercubic lattices. | Session 30: Quantum Error Correction Theory and Experiment |

422 | Continuous parity measurement and error correction | Livingston, William; Blok, Machiel; Atalaya, Juan; Yang, Jing; Mohseninia, Razieh; Jordan, Andrew; Dressel, Justin; Korotkov, Alexander; Siddiqi, Irfan | Using a chip with three qubits and connecting each pair of two to a parity readout resonator, we implement the two parity measurements needed to perform the conventional three-qubit bit-flip code. | Session 30: Quantum Error Correction Theory and Experiment |

423 | Cellular Automaton Decoder for Topological Codes with Boundaries | Vasmer, Michael; Browne, Dan; Kubica, Aleksander | In this work, we extend this cellular automaton decoder to topological codes defined on lattices with boundaries and compare its performance to other decoding algorithms. | Session 30: Quantum Error Correction Theory and Experiment |

424 | The boundaries and topological defects of the color code | Kesselring, Markus; Pastawski, Fernando; Eisert, Jens; Brown, Benjamin | We give a thorough exploration of the color code phase to find all of its boundaries and domain walls. | Session 30: Quantum Error Correction Theory and Experiment |

425 | Connecting discrete and continuous variable quantum codes | Li, Linshu; Albert, Victor; Noh, Kyungjoo; Jiang, Liang | We consider the connection between discrete variable (DV) codes based on qubit/qudit systems and continuous variable (CV) codes based on bosonic systems. | Session 30: Quantum Error Correction Theory and Experiment |

426 | Braiding via symmetry transformation: universal transversal gate set for topological codes | Zhu, Guanyu; Barkeshli, Maissam | Motivated by this finding, here we show that elements in the spherical braid group with n punctures (anyons) can be completely generated with two isometries related to different rotational symmetries of the punctured surface. | Session 30: Quantum Error Correction Theory and Experiment |

427 | Depth reduction for quantum Clifford circuits through Pauli measurements | Zheng, Yi-Cong; Lai, Ching-Yi; Brun, Todd; Kwek, Leong-Chuan | In this paper, we provide an alternative procedure to implement a Clifford circuit through Pauli measurements, by preparing O(1) ancillas that are Calderbank-Shor-Steane (CSS) stabilizer states. | Session 30: Quantum Error Correction Theory and Experiment |

428 | A Systematic Construction of Clifford Perfect Tensors | Zhang, Mengzhen; Jiang, Liang | In this work, we demonstrate a systematic approach of constructing a large class of perfect tensors, with some existing construction schemes as special cases. | Session 30: Quantum Error Correction Theory and Experiment |

429 | Calderbank-Steane-Shor Holographic Quantum Error Correcting Codes | Stace, Thomas | We demonstrate this by introducing the self-dual CSS heptagon holographic code, based on the 7-qubit Steane code. | Session 30: Quantum Error Correction Theory and Experiment |

430 | Good quantum subsystem codes in 2-dimensions | Yoder, Theodore | Given any two classical codes with parameters [n1, k, d1] and [n2, k, d2], we show how to construct a quantum subsystem code in 2-dimensions with parameters [[N, K, D]] with N <= 2 n1 n2, K=k, and D = min(d1, d2). | Session 30: Quantum Error Correction Theory and Experiment |

431 | Dynamically protected qubit based on high-impedance superconducting circuits | Campagne-Ibarcq, Phillipe; Mirrahimi, Mazyar; Devoret, Michel | Here, we propose to combine a high impedance superconducting resonator with a Josephson junction whose energy is stroboscopically modulated. | Session 30: Quantum Error Correction Theory and Experiment |

432 | Natural quantum error-correction in many-body dynamics implies stability of volume-law entangled states against projective measurements | Choi, Soonwon; Bao, Yimu; Qi, Xiaoliang; Altman, Ehud | In this work, we investigate this interplay between entangling dynamics and projective measurements from the perspective of quantum information theory. | Session 30: Quantum Error Correction Theory and Experiment |

433 | Quantum simulation of fermions: geometric locality and error mitigation | Jiang, Zhang; McClean, Jarrod; Babbush, Ryan; Neven, Hartmut | We consider mappings from fermionic systems to spin systems that preserve geometric locality in more than one spatial dimension. | Session 30: Quantum Error Correction Theory and Experiment |

434 | Approximate stabilizer rank and improved weak simulation of Clifford-dominated circuits for qudits | Huang, Yifei; Love, Peter | Here we extend their algorithm to qudits of odd prime dimensions. | Session 30: Quantum Error Correction Theory and Experiment |

435 | Direct Measurement of a Very Small Logical Qubit’s Observables | Materise, Nicholas; Kapit, Eliot | We extend recent longitudinal readout schemes to the very small logical qubit (VSLQ) architecture. | Session 30: Quantum Error Correction Theory and Experiment |

436 | Graph convolutional network for topological stabilizer codes | Suzuki, Yasunari; Davaasuren, Amarsanaa; Fujii, Keisuke; Koashi, Masato; Nakamura, Yasunobu | In this talk, we propose a novel construction of a machine-learning-based decoder with a model known as graph convolutional network. | Session 30: Quantum Error Correction Theory and Experiment |

437 | Wigner’s friend as a rational agent | Brukner, Caslav | I will first derive a no-go theorem for observer-independent outcomes (directly observable “facts” such as “detector clicks”) which would be common both for Wigner and the friend. The outcomes then are to be understood as relational in the sense that their determinacy is relative to an observer. | Session 31: Quantum Foundations |

438 | Contextuality without access to a tomographically complete set | Pusey, Matthew; del Rio, Lidia; Meyer, Bettina | Here we design tests of contextuality that are immune to this effect for a given number of unknown measurements in the tomographically complete set, allowing contextuality to be demonstrated with weaker assumptions. | Session 31: Quantum Foundations |

439 | Symmetric Informationally Complete Measurements Pinpoint the Essential Difference between Classical and Quantum Probability Theories | Stacey, Blake | I describe a general procedure for crafting a purely probabilistic representation of the Born Rule by means of a reference measurement: a minimal informationally-complete quantum measurement (MIC) and a set of linearly independent post-measurement quantum states. | Session 31: Quantum Foundations |

440 | A Volume-Maximizing Map from Quantum States to the Probability Simplex, with Applications to QBism | DeBrota, John | In this talk, I make use of a recent formulation of quantum theory in terms of minimal informationally complete quantum measurements (MICs) to promote the idea that probability is more central to quantum theory than either state vectors or operators. | Session 31: Quantum Foundations |

441 | What is nonlocal in counterfactual quantum communication? | Rohrlich, Daniel; Aharonov, Yakir | We revisit the “counterfactual quantum communication” of Salih et al., who claim that an observer “Bob” can send one bit of information to a second observer “Alice” without any physical particle traveling between them. | Session 31: Quantum Foundations |

442 | Tsirelson’s bound and Landauer’s principle in a single-system game | Henaut, Luciana; Catani, Lorenzo; Browne, Dan; Mansfield, Shane; Pappa, Anna | We introduce a simple single-system game inspired by the Clauser-Horne-Shimony-Holt (CHSH) game. | Session 31: Quantum Foundations |

443 | Consecutive measurements on the same quantum system reveal that wavefunctions do not collapse | Adami, Chris; Curic, Davor; Glick, Jennifer; Giner, Lambert; Lundeen, Jeff | We show that the standard collapse interpretation, and a formalism that uses the relative-state description of measurement in terms of von Neumann operations, differ in their predictions of the outcome of three or more consecutive measurements on the same system (while they agree about the outcome of one or two consecutive measurements). | Session 31: Quantum Foundations |

444 | Noncontextuality Inequalities from Antidistinguishability | Silva, Cristhiano; Gonzalez Alonso, Jose Raul; Leifer, Matthew | Our main contribution here is to show that they are also noncontextuality inequalities. | Session 31: Quantum Foundations |

445 | Contextuality and the Fundamental Theorems in Quantum Mechanics | Frembs, Markus | Here, we broaden this perspective considerably (partly drawing on existing, but scattered results) and show that apart from the KS theorem, also Wigner’s theorem, Gleason’s theorem and Bell’s theorem relate fundamentally to contextuality. | Session 31: Quantum Foundations |

446 | Rank of contextuality | Horodecki, Karol; Zhou, Jingfang; Horodecki, Pawel; Raussendorf, Robert; Horodecki, Ryszard; Ramanathan, Ravishankar; Tyhurst, Emily | We propose a new measure of statistical Kochen-Specker contextuality, called rank of contextuality. | Session 31: Quantum Foundations |

447 | Perturbative expansion of entanglement negativity | Cresswell, Jesse; Tzitrin, Ilan; Goldberg, Aaron | To this end we develop novel techniques in the calculus of complex, patterned matrices and use them to conduct a perturbative analysis of negativity in terms of arbitrary variations of the density operator. | Session 31: Quantum Foundations |

448 | Near-100% two-photon-like coincidence-visibility dip with classical light and the role of complementarity | Sadana, Simanraj; Ghosh, Debadrita; Joarder, Kaushik; A, Naga Lakshmi; Sanders, Barry; Sinha, Urbasi | In this talk, we show theoretically that classical light can yield a 100% TPCVD for controlled randomly chosen relative phase between the two beam-splitter input beams and experimentally demonstrate a 99.635 +/- 0.002% TPCVD with classical microwave fields. | Session 31: Quantum Foundations |

449 | Out-of-time-ordered-correlator quasi-probabilities for the quantum kicked top | Gonzalez Alonso, Jose Raul; Shammah, Nathan; Ahmed, Shahnawaz; Nori, Franco; Dressel, Justin | Out-of-time-ordered-correlator quasi-probabilities for the quantum kicked top | Session 31: Quantum Foundations |

450 | Quantum theory cannot consistently describe the use of itself | Renner, Renato; Frauchiger, Daniela | To study the question, we consider a setup consisting of four computers that take the role of agents. | Session 31: Quantum Foundations |

451 | Why QBism is immune to no-go theorems | Schack, Ruediger | This talk will explain the QBist take on the Born rule and how it resolves the apparent contradictions inherent in some recent versions of the Wigner’s friend paradox. | Session 31: Quantum Foundations |

452 | An incompleteness theorem for physics | Myers, John; Madjid, F. Hadi | We show how Gödel’s incompleteness theorems have an analog in quantum theory. | Session 31: Quantum Foundations |

453 | Ambiguity in the branching process of Many-Worlds Theories | Gerhard, Kathrin; Renner, Renato | In this talk, we present a theorem stating that none of the existing many-worlds theories can give a consistent model of a physical process. | Session 31: Quantum Foundations |

454 | Small violations of Bell inequalities for multipartite pure random states | Silva, Cristhiano; Drumond, Raphael; Oliveira, Roberto | We prove that under some conditions on the local dimension the probability to find any significant amount of violation goes to zero exponentially fast as the number of parts goes to infinity. | Session 31: Quantum Foundations |

455 | Hybrid Computation for Consistent Histories | Arrasmith, Andrew; Cincio, Lukasz; Sornborger, Andrew; Coles, Patrick; Zurek, Wojciech | To remedy this difficulty, we present a hybrid quantum/classical algorithm suited for noisy intermediate-scale quantum computers that allows us to find and study consistent histories. | Session 31: Quantum Foundations |

456 | Observing a Quantum Measurement | Lawrence, Walter | Observing a Quantum Measurement | Session 31: Quantum Foundations |

457 | Reconstructing quantum space-time from agents’ subjective experiences | del Rio, Lidia | Here, we propose exploring the opposite direction: to take agents as the basic building blocks through which we test a physical theory, and recover operational notions of locality from signalling conditions. | Session 31: Quantum Foundations |

458 | Locally Causal Quantum Mechanics in Space-Time | Waegell, Mordecai | I introduce a reformulation of quantum mechanics as a theory of physical fields in space-time which obey the constraints of special relativity. | Session 31: Quantum Foundations |

459 | Quantum Clocks: Gravitation and Relativity | Smith, Alexander; Ahmadi, Mehdi | After reviewing the CPI, I will present a generalization in which the clock and system interact — we should expect such a coupling when the gravitational interaction between the clock and system is taken into account. | Session 31: Quantum Foundations |

460 | Quantized Electromagnetic-Field Propagation in General Non-Local and Non-Stationary Dispersive and Absorbing Media | Jacobs, Verne | We develop dynamical descriptions for the propagation of quantized electromagnetic fields, in the presence of environmental interactions. | Session 31: Quantum Foundations |

461 | Spacetime formulation for time crystals and continuous variables | Zhang, Tian; Dahlsten, Oscar | Thus, space-time density matrices have been introduced and here we discuss one of these formulations called pseudo-density matrix (PDM) which treats space and time indiscriminately. | Session 31: Quantum Foundations |

462 | Using Fisher Information to Analyse Inter-measurement Quantum Particles | Arvidsson Shukur, David; Barnes, Crispin; Yunger Halpern, Nicole | In this talk we provide an operational methodology for the analysis of inter-measurement quantum particles. | Session 31: Quantum Foundations |

463 | Noninformative prior of the quantum statistical model in the qubit system | Tanaka, Fuyuhiko | In this talk, as further development, we extend the argument to general qubit models, which yields Bures geometry. | Session 31: Quantum Foundations |

464 | Uncertainty relations for time averaged weak values | Pollak, Eli | We find that anomalous spin values are associated with large variances implying that their measurement demands increased signal averaging. | Session 31: Quantum Foundations |

465 | Three-Particles Aharonov-Bohm Effect | Shikano, Yutaka | Inspired by our experiment setup, we can discuss the properties of the identical particles from the Aharonov-Bohm effect perspectives. | Session 31: Quantum Foundations |

466 | Topological barriers for charged quantum systems | Paiva, Ismael; Aharonov, Yakir; Waegell, Mordecai; Tollaksen, Jeff | Here, making use of the concept of modular variables, which evidence the dynamical nonlocality presented in quantum mechanics, we argue that this effect allows solenoids to be used as barriers of energy for charged quantum systems. | Session 31: Quantum Foundations |

467 | Quantum simulation of a general PT-symmetric two-level system | Zheng, Chao | We studied the ability to simulate and investigate novel quantum systems and phenomena using a conventional Hermitian quantum computer. | Session 31: Quantum Foundations |

468 | Computing with a single qubit faster than the computation quantum speed limit | Sinitsyn, Nikolai | I demonstrate that, if energy constraints are imposed, this resource can be used to accelerate information-processing without relying on entanglement or any other type of quantum correlations. | Session 31: Quantum Foundations |

469 | Problems with Decoherence in Quantum Geometrodynamics | Derakhshani, Maaneli | In particular, I show that the Problem of Time, the Hilbert Space Problem, and the conceptual dependence of decoherence on time evolution and Hilbert space structure implies: 1) suppression of interference cannot take place between components of a superposition of quantum-gravitational (i.e. Wheeler-DeWitt) wave functionals; 2) approximate diagonalization of the reduced density matrix (associated with said superposition) in the 3-geometry basis cannot take place, and such a reduced density matrix is mathematically ill-defined; 3) time-dependent functional Schroedinger equations for the matter components of said superposition cannot be derived in a semiclassical approximation. | Session 31: Quantum Foundations |

470 | Quantum Interferometry Meets General Relativity | Pikovski, Igor | In this talk, I will discuss a quantum version of the “twin paradox” in which a clock is brought in superposition of being at two different gravitational potentials. | Session 32: Quantum Information in Relativistic and Condensed Matter Systems |

471 | Gravitational entanglement with Gaussian states | Qvarfort, Sofia; Bose, Sougato; Serafini, Alessio | We evaluate the entanglement generated by the Newtonian potential for both cases and propose the use of two specific continuous variable entanglement witnesses to simplify the detection. | Session 32: Quantum Information in Relativistic and Condensed Matter Systems |

472 | General relativistic time dilation and spacetime uncertainty in quantum clocks | Khandelwal, Shishir; Lock, Maximilian; Woods, Mischa | Here we demonstrate that, in the weak-field and low-velocity limit, all “good” quantum clocks experience the time dilation dictated by general relativity for the most classical states of motion. | Session 32: Quantum Information in Relativistic and Condensed Matter Systems |

473 | Ontological models for relativistic quantum information | Durham, Ian | We review a number of proposals for such ontologies in the context of relativistic quantum information and quantum many-body theories, and we propose a new ontology based on the Wheeler-DeWitt equation that overcomes some of the problems inherent in existing models. | Session 32: Quantum Information in Relativistic and Condensed Matter Systems |

474 | Relativistic wave equations from quantum walks | Brun, Todd; Mlodinow, Leonard | We examine the quantum walk on the 3D body-centered lattice, and show that a set of natural symmetry assumptions lead, in the long wavelength limit, to its wave functions becoming solutions to the Dirac equation. | Session 32: Quantum Information in Relativistic and Condensed Matter Systems |

475 | Lieb-Robinson-Type Bounds for Quantum Systems with Strongly Long-Range Interactions | Guo, Andrew; Tran, Cong Minh; Childs, Andrew; Gorshkov, Alexey; Gong, Zhe-Xuan | We prove bounds on the rate of correlation-spreading in long-range quantum lattice systems—specifically those with interaction strengths that decay as a power-law r -? in the distance r. | Session 32: Quantum Information in Relativistic and Condensed Matter Systems |

476 | Locality and digital quantum simulation of power-law interactions | Tran, Minh; Guo, Andrew; Su, Yuan; Garrison, James; Eldredge, Zachary; Foss-Feig, Michael; Childs, Andrew; Gorshkov, Alexey | We derive a new Lieb-Robinson bound for systems with interactions that decay with distance r as a power law, 1/r ?. | Session 32: Quantum Information in Relativistic and Condensed Matter Systems |

477 | Composite quantum systems at the interface with general relativity | Zych, Magdalena | I will discuss a novel framework for achieving this goal, focused on low-energy but composite quantum systems and using the tools of quantum information science. | Session 32: Quantum Information in Relativistic and Condensed Matter Systems |

478 | Signature of quantum chaos in operator entanglement in 2d conformal field theories | Nie, Laimei; Nozaki, Masahiro; Ryu, Shinsei; Tan, Mao Tian | We study operator entanglement measures of the unitary evolution operators of (1+1)-dimensional conformal field theories (CFT), aiming to uncover their scrambling and chaotic behaviors. | Session 32: Quantum Information in Relativistic and Condensed Matter Systems |

479 | Exact bosonization in two and three spatial dimensions and new classes of lattice gauge theory | Chen, Yu-An; Kapustin, Anton; Radicevic, Djordje | We will describe 2d (3d) analogs of the Jordan-Wigner transformation which maps an arbitrary fermionic system on a 2d (3d) lattice to a lattice gauge theory while preserving the locality of the Hamiltonian. | Session 32: Quantum Information in Relativistic and Condensed Matter Systems |

480 | Momentum-space entanglement of disordered non-interacting one-dimensional fermions after a quantum quench | Lundgren, Rex; Liu, Fangli; Laurell, Pontus; Fiete, Gregory | We investigate the momentum-space entanglement entropy and spectrum of several disordered one-dimensional free-fermion systems that circumvent Anderson localization, such as the random-dimer model, after a quantum quench. | Session 32: Quantum Information in Relativistic and Condensed Matter Systems |

481 | Improved Training of Quantum Boltzmann Machines | Anschuetz, Eric; Cao, Yudong | In this work, we find that the locality of the gradient observables that must be sampled gives rise to an efficient sampling method based on the Eigenstate Thermalization Hypothesis (ETH), and thus an efficient method for training QBMs on quantum devices. | Session 33: Quantum Machine Learning |

482 | Measurement-based adaptation protocol with quantum reinforcement learning | Lamata, Lucas; Albarrán-Arriagada, Francisco; Retamal, Juan Carlos; Solano, Enrique | Here, we propose an algorithm based on successive measurements to adapt one quantum state to a reference unknown state, in the sense of achieving maximum overlap. | Session 33: Quantum Machine Learning |

483 | Improving training of Boltzmann machines with error corrected quantum annealing | Li, Richard; Lidar, Daniel | We have applied nested quantum annealing correction (NQAC) to do unsupervised learning with a small bars and stripes (BAS) dataset, and to a coarse-grained MNIST dataset, which consists of black-and-white images of hand-written integers, to do supervised learning. | Session 33: Quantum Machine Learning |

484 | Opportunities and Challenges in Quantum-Assisted Machine Learning | Perdomo, Alejandro | We focus on hybrid quantum-classical approaches and illustrate some of the key challenges we foresee for near-term implementations. | Session 33: Quantum Machine Learning |

485 | Quantum generative adversarial learning in a superconducting quantum circuit | Ling, Hu; wu, shuhao; Cai, Weizhou; Ma, Yuwei; Mu, Xianghao; Xu, Yuan; Wang, Haiyan; Song, Yipu; Deng, Dong-Ling; Zou, Chang-Ling; Sun, Luyan | Here, we report the first proof-of-principle experimental demonstration of quantum generative adversarial learning in a superconducting quantum circuit. | Session 33: Quantum Machine Learning |

486 | Noncommutative Boltzmann Machines | Novotny, Mark | In particular, we study ncBM with the Liouvillian superoperator, and show the negative phase of machine learning becomes easy to calculate in a particular limit. | Session 33: Quantum Machine Learning |

487 | Hybrid quantum-classical schemes for generative adversarial learning: HQGANs | Romero, Jhonathan; Aspuru-Guzik, Alan | Here, we propose to use quantum computers to learn models that mimic observed data distributions, a type of task known as generative learning, by substituting neural networks with variational quantum circuits in the generative adversarial networks (GANs) framework. | Session 33: Quantum Machine Learning |

488 | Variational circuits for machine learning with near-term devices | Schuld, Maria | This talk will focus on various issues around this approach, for example how to think about the power of variational quantum classifiers, how we can train them and what they might be good for. | Session 33: Quantum Machine Learning |

489 | Quantum Manifold Learning Algorithms for Dimensionality Reduction | He, Xi; Sun, Li; Hou, Xiaokai; Wang, Xiaoting | Compared with corresponding classical algorithms, the two quantum algorithms proposed in this paper can be implemented on a quantum computer with quantum speed-up. | Session 33: Quantum Machine Learning |

490 | Differentiable Quantum Circuits and Generative Modeling | Liu, JinGuo; Wang, Lei | We present a fresh approach to quantum machine learning by using quantum circuits as probabilistic generative models. | Session 33: Quantum Machine Learning |

491 | Machine-learned QCVV for distinguishing single-qubit noise | Scholten, Travis; Liu, Yi-Kai; Young, Kevin; Blume-Kohout, Robin | We investigate the use of machine learning (ML) algorithms for developing new QCVV protocols. | Session 33: Quantum Machine Learning |

492 | Quantum optical neural networks for next generation quantum information processing | Steinbrecher, Gregory; Olson, Jonathan; Englund, Dirk; Carolan, Jacques | Through numerical simulation and analysis we train the QONN to perform a range of quantum information processing tasks, including protocols for quantum optical state compression, reinforcement learning, and black-box quantum simulation. | Session 33: Quantum Machine Learning |

493 | The Impact of Quantum Noise in Neuromorphic Systems | Angelatos, Gerasimos; Tureci, Hakan | We present a general theoretical approach based on quantum stochastic differential equations which captures quantum noise about classical trajectories and apply it to two physical realizations of neuromorphic dynamics: an excitable laser and a superconducting circuit. | Session 33: Quantum Machine Learning |

494 | Performance of the Quantum Approximate Optimization Algorithm on the Maximum Cut Problem | Crooks, Gavin; Rubin, Nicholas | We explore these issues with the aid of QuantumFlow, a simulation of a gate based quantum computer that uses TensorFlow to rapidly optimize variational quantum circuits. | Session 33: Quantum Machine Learning |

495 | Machine Learning Detection of Bell Nonlocality in Quantum Many-Body Systems | Deng, Dong-Ling | In this talk, I will introduce machine learning techniques to the detection of quantum nonlocality in many-body systems, with a focus on the restricted-Boltzmann-machine ( RBM) architecture. | Session 33: Quantum Machine Learning |

496 | Benchmarking superconducting qubits with generative model learning | Hamilton, Kathleen; Dumitrescu, Eugen; Stemp, Holly; Pooser, Raphael | Our work is focused on the identification and development of simple machine learning tasks that can act as hardware benchmarks to compare the relative performance of NISQ devices. | Session 33: Quantum Machine Learning |

497 | Local-measurement-based quantum state tomography via neural networks | Zeng, Bei | Here, we present a machine learning method to recover the full quantum state from its local information, where a fully-connected neural network is built to fulfill the task with up to seven qubits. | Session 33: Quantum Machine Learning |

498 | Variational Quantum Neural Programming | Dallaire-Demers, Pierre-Luc | Using inspiration from neural programming in classical machine learning, we show how a quantum program can be learned through gradient descent. | Session 33: Quantum Machine Learning |

499 | Quantum machine learning: Challenges and Opportunities | Wossnig, Leonard; Severini, Simone | I will therefore introduce different input and output assumptions and discuss corresponding data access models before giving a high level explanation of the different techniques which have been proposed. | Session 33: Quantum Machine Learning |

500 | A Universal Training Algorithm for Quantum Deep Learning | Verdon, Guillaume; Pye, Jason; Broughton, Michael | We will present two main quantum optimizers leveraging this quantum backpropagation principle: Quantum Dynamical Descent (QDD), which uses quantum-coherent dynamics to optimize network parameters, and Momentum Measurement Gradient Descent (MoMGrad), which is a quantum-classical analogue of QDD. | Session 33: Quantum Machine Learning |

501 | Quantum-classical reinforcement parity learning from noisy classical data | Park, Daniel Kyungdeock; Park, Jonghun; Jeong, Suhwang; Ha, Jeongseok; RHEE, June-Koo(KEVIN) | Here, we present a quantum-classical reinforcement learning algorithm to solve the LPN problem efficiently for classical data. | Session 33: Quantum Machine Learning |

502 | Estimating quantum circuit probabilities and Hamiltonian properties using amplitude estimation | Qassim, Hammam | We describe a Markov chain monte carlo simulation of quantum circuits based on decomposing the circuit in question as a sum of Clifford gates. | Session 33: Quantum Machine Learning |

503 | Quantum metrology in the presence of dissipation with superconducting qubits. | Murch, Kater | I will discuss how such degeneracies can be realized in single dissipative qubits and present investigations of enhanced measurement sensitivity in single quantum systems. | Session 34: Quantum Measurement and Sensing |

504 | Non-Hermitian quantum sensing: exceptional point and non-reciprocal approaches | Lau, Hoi-Kwan; Clerk, Aashish | We describe here a full analysis of quantum parametric sensing using coupled mode systems described by effective non-Hermitian Hamiltonians; our approach rigorously accounts for quantum noise effects [3]. | Session 34: Quantum Measurement and Sensing |

505 | Saturating the quantum Cramér-Rao bound using LOCC | Zhou, Sisi; Zou, Chang-Ling; Jiang, Liang | In this talk, we show that the POVM based on local operations and classical communication (LOCC) is QCRB-saturating for arbitrary pure states or rank-two mixed states with varying probability distributions over fixed eigenbasis. | Session 34: Quantum Measurement and Sensing |

506 | Ramsey interferometry in correlated quantum noise environments | Norris, Leigh; Beaudoin, Felix; Viola, Lorenza | For the representative case of collective noise from bosonic sources, and experimentally relevant collective spin observables, we find that the uncertainty can increase exponentially with the number of probes. | Session 34: Quantum Measurement and Sensing |

507 | Hamiltonian engineering for quantum sensing | Liu, Yi-Xiang; Ajoy, Ashok; Hines, Jordan; Cappellaro, Paola | Inspired by digital quantum simulation, here we present a general framework in which we use Trotter-like combinations of unitaries to engineer better Hamiltonians for sensing and provide an efficient protocol to reduce the approximation error. | Session 34: Quantum Measurement and Sensing |

508 | Provably optimal controls for magnetometry in cluttered environments | Frey, Virginia; Norris, Leigh; Viola, Lorenza; Biercuk, Michael | Here we present a novel sensing protocol based on the optimal band-limited Slepian functions that overcomes both of these challenges. | Session 34: Quantum Measurement and Sensing |

509 | Quantum state tomography of a mechanical oscillator | Delaney, Robert; Reed, Adam; Andrews, Reed; Lehnert, Konrad | Here we demonstrate a pulsed measurement of the motion of a micromechanical oscillator embedded in a superconducting electromechanical circuit. | Session 34: Quantum Measurement and Sensing |

510 | Quantum sensing of magnons with a superconducting qubit | Lachance-Quirion, Dany; Wolski, Samuel; Tabuchi, Yutaka; Kono, Shingo; Usami, Koji; Nakamura, Yasunobu | These two complementary quantum sensing methods could find applications in quantum technologies based on magnonics and the detection of axions in dark matter searches. | Session 34: Quantum Measurement and Sensing |

511 | Spin-orbit semiconductors as dark matter detector targets using first-principles calculations. | Inzani, Katherine; Griffin, Sinead | In this work we investigate spin-orbit semiconductors as DM detection targets. | Session 34: Quantum Measurement and Sensing |

512 | Axion Dark Matter Detection with Superconducting Qubits | Dixit, Akash; Schuster, David; Chou, Aaron; Agrawal, Ankur; Chakram, Srivatsan; Naik, Ravi | We will report theoretical performance and progress towards characterizing fidelity and correlations of multiqubit detectors. | Session 34: Quantum Measurement and Sensing |

513 | Quantum noise limits for a class of nonlinear amplifiers | Epstein, Jeffrey; Combes, Joshua | We introduce a class of nonlinear amplifier input-output relations that allow the measurement of any normal operator using linear measurements with only vacuum fluctuations added at the output. | Session 34: Quantum Measurement and Sensing |

514 | One from many: Scalar estimation in a multiparameter context | Gross, Jonathan; Caves, Carlton | We consider a specialized case: many parameters of a Hamiltonian are unknown and one seeks an estimate for a scalar function of the Hamiltonian. | Session 34: Quantum Measurement and Sensing |

515 | Optimal measurements in simultaneous multi-parameter estimation of quantum systems | Yang, Jing; Pang, Shengshi; Zhou, Yiyu; Jordan, Andrew | For a general probe state and a projective measurement of arbitrary rank, we find the necessary and sufficient conditions under which the measurement gives rise to the multi-parameter quantum Cramer-Rao matrix bound. | Session 34: Quantum Measurement and Sensing |

516 | Imaging Vortex Dynamics in High-Tc Superconductors using Ensemble Nitrogen Vacancy (NV) Centers in Diamond | Malusare, Aditya; Pujari, Sumiran; Sengupta, Shamashis; Saha, Kasturi | In this work, we make a fully functional simulation of a thin-film type-II superconductor with properties similar to materials like BSCCO or YBCO and theoretically demonstrate a scheme for mapping vortices in real time. | Session 34: Quantum Measurement and Sensing |

517 | Zappe Photon Upconverters for Quantum Measurements of Low-Frequency Electrical Resonators, Part I: Theory | Chaudhuri, Saptarshi; Cho, Hsiao-Mei; Dawson, Carl; Graham, Peter; Gruenke, Rachel; Kuenstner, Stephen; Li, Dale; Phipps, Arran; Titus, Charles; Young, Betty; Yu, Cyndia; Irwin, Kent | We present the Zappe Photon Upconverter (ZPU), a Josephson-junction-based readout amplifier for performing quantum measurements on lumped-element LC resonators (100 Hz-300 MHz). | Session 34: Quantum Measurement and Sensing |

518 | Zappe Photon Upconverters for Quantum Measurements of Low-Frequency Electrical Resonators, Part II: Implementation of the Prototype | Kuenstner, Stephen; Chaudhuri, Saptarshi; Cho, Hsiao-Mei; Dawson, Carl; Graham, Peter; Gruenke, Rachel; Li, Dale; Phipps, Arran; Titus, Charles; Young, Betty; Yu, Cyndia; Irwin, Kent | We describe progress towards the first Zappe Photon Upconverter (ZPU), a Josephson-junction-based device capable of performing quantum mechanical readout protocols on low-frequency, lumped-element electromagnetic resonators. | Session 34: Quantum Measurement and Sensing |

519 | Optical sensing of biological processes with nitrogen-vacancy centers in nanodiamonds | Li, Changhao; Lyzwa, Dominika; Kohandel, Mohammad; Cappellaro, Paola | Here we first directly cover the nanodiamonds with chelated Gd and characterize the quenching effect for different Gd concentrations on an ensemble of nanodiamonds with an average diameter of around 20 nm. We will further show how the nanodiamonds can be connected with Gd via a cleavable peptide sequence. | Session 34: Quantum Measurement and Sensing |

520 | High Sensitivity Magnetometry with a Fibre-coupled Diamond Sensor | Patel, Rajesh; Frangeskou, Angelo; Stimpson, Guy; Nichols, Eleanor; Thornley, William; Breeze, Ben; Green, Ben; Onoda, Shinobu; Isoya, Junichi; Morley, Gavin | We present a fiber-coupled system which aims to detect the magnetic fields produced by electrical currents in the heart. | Session 34: Quantum Measurement and Sensing |

521 | Dopant-Free Single Electron Pumps for Quantum Metrology | Sfigakis, Francois; Buonacorsi, Brandon; Shetty, Arjun; Deimert, Chris; Tam, Alan; Kim, HoSung; Wasilewski, Zbig; Ubbelohde, Niels; Hohls, Frank; Baugh, Jonathan | At low temperature, we have observed low-disorder quantized conductance in quantum wires fabricated in dopant-free GaAs/AlGaAs two-dimensional electron gases (2DEG) with mobilities up to 7×10 6 cm 2/Vs (at 2.9×10 11 /cm 2), with a 1D subband energy level spacing that can be tuned from 1 meV to more than 5 meV on individual devices. | Session 34: Quantum Measurement and Sensing |

522 | Imaging Viscous Flow of Hydrodynamic Electron Fluid in Graphene with Nitrogen Vacancy Centers in Diamond | Ku, Mark; Zhou, Tony; Li, Qing; Shin, Young Jae; Shi, Jing; Burch, Claire; Zhang, Huiliang; Casola, Francesco; Watanabe, Kenji; Taniguchi, Takashi; Kim, Philip; Yacoby, Amir; Walsworth, Ronald | In this work, we directly observe viscous Poiseuille flow in hBN-encapsulated graphene channels via imaging the associated stray magnetic field with nitrogen-vacancy (NV) centers in diamond. | Session 34: Quantum Measurement and Sensing |

523 | Imaging the local charge environment of nitrogen-vacancy centers in diamond | Mittiga, Thomas; Hsieh, Satcher; Zu, Chong; Kobrin, Bryce; Machado, Francisco; Bhattacharyya, Prabudhya; Rui, Nicholas; Jarmola, Andrey; Choi, Soonwon; Budker, Dmitry; Yao, Norman | We introduce a microscopic model that quantitatively captures the observed spectra for samples with NV concentrations spanning over two orders of magnitude. | Session 34: Quantum Measurement and Sensing |

524 | Spatial noise filtering through new error-correcting codes for quantum sensing | Layden, David; Zhou, Sisi; Jiang, Liang; Cappellaro, Paola | To this end, we introduce a new family of quantum error-correcting codes for sensing, which are both application- and hardware-adapted. | Session 34: Quantum Measurement and Sensing |

525 | Continuous error correction for quantum metrology | Pang, Shengshi; Zheng, Yi-Cong; Brun, Todd; Jordan, Andrew | Here, we analyze how the rate of continuous-time quantum error correction affects quantum metrology. | Session 34: Quantum Measurement and Sensing |

526 | Optical hyerpolarization in nanodiamonds: towards quantum-enhanced NMR/MRI | Ajoy, Ashok; Nazaryan, Raffi; Lv, Xudong; Liu, Kristina; Druga, Emanuel; Reimer, Jeffrey; Meriles, Carlos; Pines, Alexander | In this work, we produce ” optically hyperpolarized nanodiamonds”, obtaining high bulk 13C polarization (~1%) [1]. | Session 34: Quantum Measurement and Sensing |

527 | Optically hyperpolarized Nano-Diamond MRI at Room Temperature | Lv, Xudong; Druga, Emanuel; Nazaryan, Raffi; McKnelly, Tommy; Pines, Alexander; Ajoy, Ashok; Walton, Jeffrey | Here we demonstrate a room temperature hyperpolarized nano-diamond 13C imaging with an enhancement of ~600 against 7T thermal polarization[2]. | Session 34: Quantum Measurement and Sensing |

528 | Environment-assisted quantum sensing with entangled electronic spins in diamond | Sun, Won Kyu Calvin; Cooper, Alexandre; Jaskula, Jean-Christophe; Cappellaro, Paola | Thus, utilizing a single nitrogen-vacancy (NV) center and a nearby electron spin (X) in diamond, we explore this question by comparing the performance of N=1 (NV) and N=2 (NV + X) register in ac magnetometry. | Session 34: Quantum Measurement and Sensing |

529 | Nanoscale mechanical sensing at ambient conditions | Liu, Chufeng; Xia, Kangwei; Leong, Weng Hang; Yang, Zhiyuan; Li, Quan; Liu, Ren-Bao | In this talk we will discuss the application of diamond NV centers in nanoscale mechanical sensing at ambient conditions. | Session 34: Quantum Measurement and Sensing |

530 | Nanoscale mechanical sensing in aqueous solutions | Xia, Kangwei; Liu, Chufeng; Leong, Weng Hang; Kwok, Man-Hin; Liu, Ren-Bao; Li, Quan | In this talk we will discuss the application of diamond NV centers in nanoscale mechanical sensing in aqueous solutions. | Session 34: Quantum Measurement and Sensing |

531 | Role of nonclassical correlations in quantum parameter estimation assisted by a local measurement scheme in thermal equilibrium | Sone, Akira; Zhuang, Quntao; Li, Changhao; Liu, Yi-Xiang; Cappellaro, Paola | We introduce a practical discord, called discord for local metrology, to measure the nonclassical correlations induced by local optimal measurement, and we explicitly derive its relation to loss in quantum Fisher information in the high-temperature limit. | Session 34: Quantum Measurement and Sensing |

532 | Super-sensitive Metrology using Induced Coherence | Plick, William; Miller, Nathaniel | We use an analysis in terms of general squeezing and show that super-sensitivity occurs only in this case – that is, the effect is not present in the spontaneous-parametric-down-conversion regime, which previous analyses and experiments have focused on. | Session 34: Quantum Measurement and Sensing |

533 | Oxygenated (113) diamond surface for nitrogen-vacancy quantum sensors with preferential alignment and long coherence time from first principles | LI, SONG; Chou, Jyh-Pin; Wei, Jie; Sun, Minglei; Hu, Alice; Gali, Adam | In this work, the surface terminators of (113) diamond to host shallow NV centers are studied by means of first principles calculations. | Session 34: Quantum Measurement and Sensing |

534 | Quantum-enhanced rotation measurements – a multiparameter problem | Goldberg, Aaron; James, Daniel | We present a class of states that offer similar enhanced sensitivities in estimating both the orientation of an unknown rotation axis and the angle rotated about it. | Session 34: Quantum Measurement and Sensing |

535 | Detecting Macroscopic Indefiniteness of Cat States in Bosonic Interferometers | Kelly, Shane; Timmermans, Eddy; Tsai, Shan-Wen | The method we propose, uses observation of a statistical distribution to demonstrate the macroscopic distinction between dead and alive states and the interferometric sensitivity(Fisher Information) to detect the indefiniteness of the vital status of the cat. | Session 34: Quantum Measurement and Sensing |

536 | Optimal Estimation of Complex Squeezing in Phase Space | Sidhu, Jasminder; Kok, Pieter | We apply quantum estimation theory to optimally characterise the squeezing parameter ?. | Session 34: Quantum Measurement and Sensing |

537 | Minimal quantum state representations from denoising auto-encoders | Lotfallahzadeh Barzili, Shiva; Mohseninia, Razieh; Dressel, Justin | We investigate the use of supervised machine learning, in the form of modified denoising auto-encoders, to simultaneously remove experimental noise while finding minimal latent representations of the quantum state. | Session 34: Quantum Measurement and Sensing |

538 | An implementation of the generalized coherent-state measurements | Jackson, Christopher | We show how one can in principle realize this POVM by a sequence of isotropic weak measurements. | Session 34: Quantum Measurement and Sensing |

539 | Detecting Dark Matter with Polar Materials using ab initio calculations. | Griffin, Sinead; Knapen, Simon; Lin, Tongyan; Zurek, Kathryn | In this work we propose the direct detection of DM with polar materials, considering both the scattering of optical and acoustic phonons by light DM, and the absorption of dark photons by optical phonons. | Session 34: Quantum Measurement and Sensing |

540 | Long-living coherence in 2D and 3D disordered dipolar-coupled spin systems under strong periodic driving | Dobrovitski, Viatcheslav; Hahn, Walter | We show that the many-body localization is only marginally related to the appearance of the slowly decaying coherence. | Session 34: Quantum Measurement and Sensing |

541 | Results and model for single-gate ratchet charge pumping | Zimmerman, Neil; Murray, Roy; Perron, Justin; Stewart, Michael; Kataoka, Masaya; Giblin, Stephen; Fletcher, Jonathan | We propose several methods to reduce these sources of error, including reducing gate oxide thickness and reducing cross capacitances. | Session 34: Quantum Measurement and Sensing |

542 | Superparamagnetic reversal of single magnetic nanoparticles near phase transition | Wang, Ning; Leong, Weng Hang; Liu, Gang-Qin; Feng, Xi; Liu, Chufeng; Yang, Sen; Wrachtrup, Joerg; Li, Quan; Liu, Renbao | Here, we utilize nitrogen-vacancy centers in diamond as a quantum probe to study the SPM reversal of individual magnetic particles. | Session 34: Quantum Measurement and Sensing |

543 | Quantum information measures of the Aharonov-Bohm ring in uniform magnetic fields | Olendski, Oleg | Quantum information measures of the Aharonov-Bohm ring in uniform magnetic fields | Session 34: Quantum Measurement and Sensing |

544 | Electron spin coherence measurements of high-density silicon vacancy ensembles in silicon carbide | Abraham, John; Epstein, Jacob; Wathen, Jeremiah | To explore the feasibility of this development path for silicon vacancies in silicon carbide, we will present electron spin coherence measurements of neutron irradiated samples of silicon carbide. | Session 34: Quantum Measurement and Sensing |

545 | Achieving the Heisenberg limit in quantum metrology using quantum error correction | Jiang, Liang | We study how measurement precision can be enhanced through quantum error correction, a general method for protecting a quantum system from the damaging effects of noise. | Session 35: Quantum Measurement with Amplifiers and Photon Detectors |

546 | Broadband Amplification and Squeezed Light Generation with Dispersion Engineered Josephson Metamaterial | Qiu, Jack; O’Brien, Kevin; Grimsmo, Arne; Kannan, Bharath; Sung, Youngkyu; Krantz, Philip; Calusine, Greg; Bolkhovsky, Vladimir; Orlando, Terry; Siddiqi, Irfan; Gustavsson, Simon; Oliver, William | In this talk, we present our latest results for operating in non-degenerate four wave mixing with dual dispersion engineered Josephson traveling wave parametric amplifier (JTWPA) and discuss our investigations of the JTWPA squeezing performance. | Session 35: Quantum Measurement with Amplifiers and Photon Detectors |

547 | Ideal two-mode phase sensitive quantum amplifier: theory | Metelmann, Anja; Lanes, Olivia; Chien, Tzu-Chiao; Cao, Xi; Liu, Gangqiang; Liu, Chenxu; Pekker, David; Aumentado, Jose; Hatridge, Michael; Clerk, Aashish | Here, we show this is not the case: one can have a two-mode phase-sensitive amplifier that is ideal with respect to a number of metrics: it has distinct input and output ports, no reflection gain, is quantum-limited and it does not suffer from a gain-bandwidth limit. | Session 35: Quantum Measurement with Amplifiers and Photon Detectors |

548 | Ideal Two-Mode Phase Sensitive Quantum Amplifier: Experiment | Lanes, Olivia; Chien, Tzu-Chiao; Cao, Xi; Liu, Gangqiang; Liu, Chenxu; Pekker, David; Metelmann, Anja; Clerk, Aashish; Aumentado, Jose; Hatridge, Michael | We will present data which uses paired, detuned gain processes as well as two separate methods of combining gain and photon conversion, all in the same physical device. | Session 35: Quantum Measurement with Amplifiers and Photon Detectors |

549 | How Hamiltonian non-linearities limit the performance of Josephson parametric amplifiers | Liu, Chenxu; Chien, Tzu-Chiao; Hatridge, Michael; Pekker, David | Using numerical evolution of the classical non-linear equations of motion that describe a single non-degenerate gain process in a Josephson Parametric Converter (JPC), we analyze the factors limiting its performance. | Session 35: Quantum Measurement with Amplifiers and Photon Detectors |

550 | Lumped, Single-ended Josephson Parametric Converters for Hamiltonian Engineering | Chien, Tzu-Chiao; Cicak, Katarina; Lecocq, Florent; Lanes, Olivia; Cao, Xi; Liu, Chenxu; Liu, Gangqiang; Pekker, David; Aumentado, Jose; Hatridge, Michael | We present a design and implementation of a lumped single ended design for the Josephson Parametric Converter (JPC) whose inductance is dominated by the central Josephson Ring Modulator (JRM). | Session 35: Quantum Measurement with Amplifiers and Photon Detectors |

551 | Quantum nonlinear dynamics of non-degenerate parametric amplification beyond the stiff-pump approximation | Khan, Saeed; Metelmann, A.; Tureci, Hakan | We present a theoretical analysis of non-degenerate parametric amplification going beyond this stiff-pump approximation, in particular accounting for the quantum dynamics of the pump mode. | Session 35: Quantum Measurement with Amplifiers and Photon Detectors |

552 | Microwave photo-multiplication based on inelastic Cooper-pair tunneling | Albert, Romain; Blanchet, Florian; Hazra, Dibyendu; Leppaekangas, Juha; Jebari, Salha; Hofheinz, Max | In this case, we can show that the energy of a tunneling Cooper pair can be used to convert an incoming single photon state into a n-photon Fock state in a different mode. | Session 35: Quantum Measurement with Amplifiers and Photon Detectors |

553 | A Superconducting Single Microwave Photon Detector Enabled by Dissipation Engineering – Theory | Flurin, Emmanuel; Lescanne, Raphael; Deleglise, Samuel; Leghtas, Zaki | In this work, we develop a new class of detectors, based on dissipation engineering, that perform quantum non demolition measurements of travelling microwave wavepackets. | Session 35: Quantum Measurement with Amplifiers and Photon Detectors |

554 | A Superconducting Single Microwave Photon Detector Enabled by Dissipation Engineering – Experiment | Lescanne, Raphael; Flurin, Emmanuel; Deleglise, Samuel; Leghtas, Zaki | In this work, we develop a new class of detectors, based on dissipation engineering, that perform quantum non demolition measurements of travelling microwave wavepackets. | Session 35: Quantum Measurement with Amplifiers and Photon Detectors |

555 | Detecting single-Infrared-photon by graphene Josephson junction | Fong, Kin Chung; Walsh, Evan; Lee, Gil-Ho; Efetov, Dmitri; Jung, Woo-Chan; Huang, Ko-Fan; Ohki, Thomas; Kim, Philip; Englund, Dirk | Here we will present the concept of a graphene-based Josephson junction single-photon detector that can potentially perform in a wide electromagnetic spectrum. | Session 35: Quantum Measurement with Amplifiers and Photon Detectors |

556 | Universal Quantum Control through Deep Reinforcement Learning | Niu, Murphy Yuezhen; Smelyanskiy, Vadim; Boixo, Sergio; Neven, Hartmut | We discover in this work that deep reinforcement learning (RL) techniques are capable of solving complex multi-qubit quantum control problems robustly against control errors. | Session 36: Quantum Optimal Control and Machine Learning |

557 | Reinforcement learning using AlphaZero to optimize entanglement sythesis in circuit QED | Motzoi, Felix; Dalgaard, Mogens; Sorenson, Jens Jakob; Sherson, Jacob | We present an implementation of a reinforcement learning algorithm using deep neural networks and Monte Carlo tree search to demonstrate global optimization of the control landscape of superconducting qubits. | Session 36: Quantum Optimal Control and Machine Learning |

558 | Applications of machine learning and related techniques to quantum control problems | Boixo, Sergio; Niu, Murphy; Smelyanskiy, Vadim; Neven, Hartmut | Applications of machine learning and related techniques to quantum control problems | Session 36: Quantum Optimal Control and Machine Learning |

559 | Filtering noise through quantum control in high-dimensional systems | Hush, Michael; Ball, Harrison; Edmunds, Claire; Lucarelli, Dennis; Biercuk, Michael | We expand on existing single-qubit approaches and present a generalized, computationally efficient framework to calculate filter functions for operations performed on D-dimensional manifolds such as pairs of interacting qubits (including spectator levels), and qudits. | Session 36: Quantum Optimal Control and Machine Learning |

560 | Fast, high-fidelity single-qubit gates in strongly coupled multi-qubit systems | Deng, Xiuhao; Barnes, Edwin; Economou, Sophia | Here, we present a novel method to mitigate errors in single-qubit gates due to coupling to a second qubit that involves building the coupling-dependent frequency shifts directly into the gate design. | Session 36: Quantum Optimal Control and Machine Learning |

561 | Optimal Control for Robust Atomic Fountain Interferometers | Goerz, Michael; Kunz, Paul; Kasevich, Mark; Malinovsky, Vladimir | Starting from a pulse scheme based on rapid adiabatic passage, we employ Krotov’s method of numerical optimal control and ensemble optimization [2] to find shaped laser pulses that yield an increase in fidelity and robustness by roughly two orders of magnitude. | Session 36: Quantum Optimal Control and Machine Learning |

562 | Hamiltonian Amplification | Arenz, Christian; Bondar, Denys; Burgarth, Daniel; Cormick, Cecilia; Rabitz, Herschel | In sharp contrast we show that many continuous variable systems can be sped-up without such knowledge, given that the structure of the underlying Hamiltonian is known. | Session 36: Quantum Optimal Control and Machine Learning |

563 | Enhanced superconducting qubit gates via accelerated adiabatic evolution | Ribeiro, Hugo; Clerk, Aashish | We focus on approaches based on accelerated STIRAP (stimulated Raman adiabatic passage) [1, 2], and on specific implementations in various superconducting circuit architectures (both for transmon style qubits, and for fluxonium style qubits). | Session 36: Quantum Optimal Control and Machine Learning |

564 | Optimized Single Flux Quantum Pulse Trains for High-fidelity Qubit Control | Li, Kangbo; McDermott, Robert; Vavilov, Maxim | In this talk, we describe an approach for the derivation and validation of complex SFQ pulse sequences in which classical bits are clocked to the qubit at a frequency that is a factor of a few higher than the qubit oscillation frequency, allowing for variable pulse-to-pulse timing in the qubit control sequence. | Session 36: Quantum Optimal Control and Machine Learning |

565 | Minimal Time Robust Control for Superconducting Qubit Devices | Ginossar, Eran; Allen, Joseph; Kosut, Robert | We apply robust optimal control techniques to demonstrate that it is feasible to reduce the operation time of the cross-resonance gate in superconducting systems to under 100 ns with two-qubit gate delities of F > 0:999, where this gate delity will not be coherence limited and would thus be achievable in experimental operation. | Session 36: Quantum Optimal Control and Machine Learning |

566 | Error robust quantum logic for superconducting circuits | Ball, Harrison; Liebermann, Per; Hush, Michael; Biercuk, Michael | In this talk we describe error modeling identifying dominant error channels in superconducting circuits implementing both parametrically activated and cross-resonance two-qubit gates. | Session 36: Quantum Optimal Control and Machine Learning |

567 | Geometric formalism for constructing arbitrary single-qubit dynamically corrected gates | Zeng, Junkai; Barnes, Edwin | Here, we show that these earlier findings are a special case of a larger geometrical structure hidden within the time-dependent Schroedinger equation. | Session 36: Quantum Optimal Control and Machine Learning |

568 | Quantum control of spins in silicon carbide with photons and phonons | Awschalom, David | We find that defect-based electronic states in SiC [1] can be isolated and optically probed at the single spin level with surprisingly long spin coherence times and high-fidelity control within non-isotopically purified, commercial-grade wafers operating at near-telecom wavelengths. | Session 37: Quantum Sensing and Computation with Defects |

569 | Quantum network nodes with silicon-vacancy center and coupled nuclear spins in diamond nanocavities | Sukachev, Denis; Bhaskar, Mihir; Nguyen, Christian; Evans, Ruffin; Machielse, Bartholomeus; Park, Hongkun; Loncar, Marko; Lukin, Mikhail | We observe coupling to nearby 13C spins and demonstrate coherent control of the SiV- 13C register. | Session 37: Quantum Sensing and Computation with Defects |

570 | Resonant optical spin initialization and readout of single silicon vacancies in silicon carbide | Soykal, Oney; Banks, Hunter; Carter, Samuel; Reinecke, Thomas | We present a theoretical fine structure model that describes the energy level structure and reveals all intersystem crossing and spin polarization time constants of the V2 defect, shedding light on its optical and spin characteristics. | Session 37: Quantum Sensing and Computation with Defects |

571 | Fault-Tolerant Quantum Metrology with High-Density Spin Ensembles: Theory | Choi, Joonhee; Zhou, Hengyun; Choi, Soonwon; Landig, Renate; Knowles, Helena; Isoya, Junichi; Jelezko, Fedor; Onoda, Shinobu; Sumiya, Hitoshi; Lukin, Mikhail | Here, we present a novel formalism for the fault-tolerant design of sensing sequences that simultaneously decouples interactions and suppresses the effects of disorder and imperfect controls, while maximizing sensitivity to an external signal. | Session 37: Quantum Sensing and Computation with Defects |

572 | Fault-Tolerant Quantum Metrology with High-Density Spin Ensembles: Experimental Results | Knowles, Helena; Zhou, Hengyun; Choi, Joonhee; Choi, Soonwon; Landig, Renate; Isoya, Junichi; Jelezko, Fedor; Onoda, Shinobu; Sumiya, Hitoshi; Lukin, Mikhail | We utilize the prolonged coherence time to perform quantum metrology, demonstrating an increase in sensitivity compared to conventional sensing protocols such as the XY-8 sequence. | Session 37: Quantum Sensing and Computation with Defects |

573 | Multi-qubit registers with solid-state defect centers | Bersin, Eric; Trusheim, Matthew; Chen, Kevin; Walsh, Michael; Mouradian, Sara; Schröder, Tim; Englund, Dirk | In this work, we present progress made towards producing such ensembles. | Session 37: Quantum Sensing and Computation with Defects |

574 | Toward Single-Spin Imaging with Shallow Diamond Nitrogen-Vacancy Centers | Zhang, Zhiran; Bluvstein, Dolev; Williams, Nicolas; Jayich, Ania | We demonstrate experimental protocols to mitigate the detrimental effects, and we present progress towards imaging single molecules. | Session 37: Quantum Sensing and Computation with Defects |

575 | High sensitivity quantum limited electron spin resonance spectroscopy | Ranjan, Vishal; Probst, Sebastian; Albanese, Bartolo; Flurin, Emmanuel; Pla, Jarryd; Vion, Denis; Esteve, Daniel; Molmer, Klaus; Morton, John; Bertet, Patrice | Following recent advances in circuit quantum electrodynamics, we have employed high quality factor superconducting resonators to reduce the mode volume around the spins and operate ESR in so-called Purcell regime [1,2] where a larger g not only leads to a larger signal but also provides a high repetition rate. | Session 37: Quantum Sensing and Computation with Defects |

576 | Enhanced spin-squeezing using a parametrically-driven cavity | Groszkowski, Peter; Leroux, Catherine; Govia, Luke; Clerk, Aashish | In this talk, we will describe and analyze a new, highly-efficient method for generating spin squeezing that exploits a cavity subject to a two-photon (parametric) drive. | Session 37: Quantum Sensing and Computation with Defects |

577 | All-optical cryogenic thermometry based on NV centers in nanodiamonds | Fukami, Masaya; Yale, Christopher; Andrich, Paolo; Liu, Xiaoying; Heremans, Joseph; Nealey, Paul; Awschalom, David | Here we demonstrate a cryogenic-compatible, all-optical thermometry technique based on the emission spectrum of an ensemble of NV centers in NDs that operates from room-temperature to liquid nitrogen temperatures. | Session 37: Quantum Sensing and Computation with Defects |

578 | Optically coherent NV centers in um-thick etched diamond membranes for quantum applications | Ruf, Maximilian; IJspeert, Mark; Van Dam, Suzanne; Weaver, Matthew; de Jong, Nick; van den Berg, Hans; Flipse, Jasper; Eschen, Martin; Sager La Ganga, Santi; Evers, Guus; Hanson, Ronald | We incorporate such devices in an open, tunable micro-cavity setup, with the potential for a two orders-of-magnitude increase in remote entangling rates. | Session 37: Quantum Sensing and Computation with Defects |

579 | CMOS-Integrated Diamond Nitrogen-Vacancy Quantum Sensor | Foy, Christopher; Ibrahim, Mohamed; Kim, Donggyu; Trusheim, Matthew; Englund, Dirk; Han, Ruonan | We report the first on-chip quantum sensor which combines CMOS integrated circuit technologies with nitrogen-vacancy (NV) centers in diamond. | Session 37: Quantum Sensing and Computation with Defects |

580 | Scanning Nitrogen-Vacancy Center Magnetic Imaging | Baumann, Susanne; Jenkins, Alec; Meynell, Simon; Jayich, Ania | Here we use a cryogenic scanning NV magnetometer to probe materials that exhibit nanoscale magnetic phenomena often inaccessible to other experimental tools over a variety of temperatures. | Session 37: Quantum Sensing and Computation with Defects |

581 | Hybrid quantum-classical algorithm for variational coupled cluster method | Subramanian, Sathyawageeswar; Cao, Yudong | We present a hybrid quantum algorithm for the variational coupled cluster (vCC) method in quantum chemistry. | Session 38: Quantum Simulation of Many-Body Physics |

582 | Optical manipulation of entanglement in plasmonically coupled quantum dot qubits | Otten, Matthew; Gray, Stephen; Kolmakov, German | We consider a system composed of two quantum dot qubits coupled with a common, damped surface plasmon mode; each quantum dot is also coupled to a separate photonic cavity mode. | Session 38: Quantum Simulation of Many-Body Physics |

583 | Simulating the t-J Model on a Quantum Computer | Rost, Brian; Freericks, James | We consider algorithms for simulating the t-J model, a prominent model for high temperature superconductivity, on a quantum computer. | Session 38: Quantum Simulation of Many-Body Physics |

584 | Non-linear sigma model approach to many-body quantum chaos: regularized and unregularized out-of-time-ordered correlators | Liao, Yunxiang; Galitski, Victor | In this work, we derive an extended version of Keldysh non-linear sigma model to investigate many-body quantum chaos in a 2D interacting fermion system subject to quenched disorder. | Session 38: Quantum Simulation of Many-Body Physics |

585 | Information spreading in many-body systems and the out-of-time-ordered correlator | Xu, Shenglong; Swingle, Brian | Using a time-dependent disordered Hamiltonian model, I will analytically show the emergence of hydrodynamics description of the OTOC arising from the unitary real-time dynamics. | Session 38: Quantum Simulation of Many-Body Physics |

586 | Graph theory and bounds on operator growth | Lucas, Andrew | Motivated by recent developments in many-body quantum chaos, I will present bounds on the growth of operators in k-local quantum many-body systems. | Session 38: Quantum Simulation of Many-Body Physics |

587 | Quantum codes for quantum simulation of Fermions on a square lattice of qubits | Steudtner, Mark; Wehner, Stephanie | In this work we concatenate the (one-dimensional) Jordan-Wigner transform with specific quantum codes defined under the addition of a certain number of auxiliary qubits. | Session 38: Quantum Simulation of Many-Body Physics |

588 | Realizing quantum Ising models in tunable two-dimensional arrays of single Rydberg atoms | Browaeys, Antoine | Realizing quantum Ising models in tunable two-dimensional arrays of single Rydberg atoms | Session 38: Quantum Simulation of Many-Body Physics |

589 | Phase structure of Ising models at complex temperature | Oganesyan, Vadim; Basu, Sankhya | This work explores continuation of phases and phase transtions in statistical sums of planar Ising models to complex couplings — temperature and field. | Session 38: Quantum Simulation of Many-Body Physics |

590 | Quantum Feedback Protocol for Calculating Single-Particle Green’s Functions at Finite Temperature | Freericks, James; Cohn, Jeffrey; Yang, Forest; Najafi, Khadijeh; Jones, Barbara | Drawing on the eigenstate thermalization hypothesis, we present a quantum feedback algorithm that approximates single-particle Green’s functions at finite temperature. | Session 38: Quantum Simulation of Many-Body Physics |

591 | Quantum Error Correcting Codes in Eigenstates of Translation-Invariant Spin Chains | Brandao, Fernando; Crosson, Elizabeth; Sahinoglu, Burak; Bowen, John | Applying this result to 1D classical systems, we describe a method for using local symmetries to construct parent Hamiltonians that embed these codes into the low-energy subspace of gapless 1D quantum spin chains. | Session 38: Quantum Simulation of Many-Body Physics |

592 | A synthetic gauge field in a two-dimensional time-multiplexed quantum random walk | Chalabi, Hamidreza; Barik, Sabyasachi; Mittal, Sunil; Hafezi, Mohammad; Murphy, Thomas; Waks, Edo | In this presentation, we propose adding synthetic gauge fields for controlling the evolution of the random walk which is important to simulate a broad class of physical effects. | Session 38: Quantum Simulation of Many-Body Physics |

593 | Quantum to ‘classical’ behaviour in closed-systems thermodynamics: an analysis of the quantum work distribution in driven fermionic chains | Zawadzki, Krissia; Herrera, Marcela; Serra, Roberto; D’Amico, Irene | We propose to examine this question in the context of out-of-equilibrium Hubbard chains by inspecting the extracted work ?W? and the first four central moments ?W – ?W?? k , (k=1,2,3,4)$ of P(W). | Session 39: Quantum Thermodynamics and Resource Theories |

594 | Local superfluid distillation of Bose liquids | Volkoff, Tyler; Kwon, Yongkyung | By introducing a localized resource theory of quantum coherence, we discuss limits to local distillation of complete superfluidity from imperfect superfluid states. | Session 39: Quantum Thermodynamics and Resource Theories |

595 | Work Extraction from a Single Energy Eigenstate | Kaneko, Kazuya; Iyoda, Eiki; Sagawa, Takahiro | We attempt to unify these two perspectives by examining the possibility of extracting work from a single energy eigenstate. | Session 39: Quantum Thermodynamics and Resource Theories |

596 | DFT protocols for quantum thermodynamics of out-of-equilibrium systems | Skelt, Amy; Zawadzki, Krissia; Herrera, Marcela; D’Amico, Irene | Inspired by the Kohn-Sham approach to Density Functional Theory (DFT), we propose to tackle this problem in a framework where the system is effectively described by non-interacting particles, and extend the protocol introduced in M. Herrera, R.M. Serra, I. D’Amico, Scientific Reports 7, 4655 (2017). | Session 39: Quantum Thermodynamics and Resource Theories |

597 | Absolute irreversibility and continuous quantum measurement: a fluctuation theorem perspective | Kizhakkumpurath Manikandan, Sreenath; Elouard, Cyril; Jordan, Andrew | Here we show that, in the absence of a thermal reservoir, the dynamics of continuously measured quantum systems can also be described by a fluctuation theorem, where the fluctuations originate from inherently probabilistic quantum measurement dynamics. | Session 39: Quantum Thermodynamics and Resource Theories |

598 | Thermodynamics of fast quantum gates | Elouard, Cyril; Esposito, Massimiliano; Auffèves, Alexia; Jordan, Andrew | Here we propose a thermodynamic description that is valid at short time-scales, where the dynamics is captured by the Optical Bloch Equations, featuring coherent excitation exchanges between qubit and the field. | Session 39: Quantum Thermodynamics and Resource Theories |

599 | Quantum of information and its fluctuations in a conductor heat current | Utsumi, Yasuhiro | We revisit this problem by analyzing a novel quantity, the distribution of fluctuating information, particle and heat currents, which is closely related to the `Rényi entanglement entropy’ [4]. | Session 39: Quantum Thermodynamics and Resource Theories |

600 | Work extraction and Landauer’s principle in a quantum spin Hall device | Adagideli, Inanc; Bozkurt, Ahmet; Pekerten, Baris | In this work, we focus on heat and charge transport in a quantum spin Hall device in the presence of a spin bath. | Session 39: Quantum Thermodynamics and Resource Theories |

601 | The dramatic impact of non-energetic coherences on heat flows | Lombard Latune, Camille; Sinayskiy, Ilya; Petruccione, Francesco | To assess the resulting effects of coherences on heat flows we introduce a concept of apparent temperature [1] which crucially takes into account coherences, by contrast with the virtual temperature [2]. | Session 39: Quantum Thermodynamics and Resource Theories |

602 | Quantum thermalization and optimal control are compatible in a many-body system | Rodriguez, Ferney; Gómez-Ruiz, Fernando; Quiroga, Luis; Johnson, Neil | We propose a novel protocol for characterizing and ultimately controlling collective matter-radiation effects that emerge when a many-body quantum system is driven through a critical value of the interaction coupling strength. | Session 39: Quantum Thermodynamics and Resource Theories |

603 | Critical point behaviour of a measurement-based quantum heat engine | Chand, Suman; Biswas, Asoka | We choose two trapped ions as the working system, subject to a magnetic field and an internal energy-exchange coupling J 1. | Session 39: Quantum Thermodynamics and Resource Theories |

604 | Topological work in nonequilibrium quantum thermodynamics | Stafford, Charles; Shastry, Abhay; Xu, Yiheng; Jimenez Valencia, Marco | As a model open quantum system out of equilibrium, we consider a system of electrons coupled to multiple (typically 3) macroscopic electron reservoirs and threaded by an Aharonov-Bohm flux ?. | Session 39: Quantum Thermodynamics and Resource Theories |

605 | Observable Thermalization | Anza, Fabio | Here we argue that it is necessary to propose a new way of describing thermal equilibrium, focused on observables rather than on the full state of the quantum system. | Session 39: Quantum Thermodynamics and Resource Theories |

606 | Nonequilibrium thermodynamics and many-body dynamics in open quantum systems | Ueda, Masahito | I will address these issues and closely related problems of thermalization, heating and many-body localization in isolated and open quantum systems. | Session 40: Qubit Readout and Open Systems |

607 | Multiplexed Readout of Superconducting Qubits in 3D cQED Architecture Using Impedance Engineered Broadband JPA | Kundu, Suman; Gheeraert, Nicolas; Hazra, Sumeru; Roy, Tanay; Salunkhe, Kishor; Patankar, Meghan; Vijayaraghavan, Rajamani | We propose and demonstrate a frequency-multiplexed readout scheme in 3D cQED architecture. | Session 40: Qubit Readout and Open Systems |

608 | Increasing qubit readout fidelity and efficiency with two-mode squeezed light | Cao, Xi; Liu, Gangqiang; Chien, Tzu-Chiao; Lu, Pinlei; Hatridge, Michael | We have observed a 22% improvement in the voltage Signal-to-Noise Ratio (SNR) of the measurement compared to coherent light. | Session 40: Qubit Readout and Open Systems |

609 | cross-resonance-based readout scheme of a superconducting flux qubit | Yoshihara, Fumiki; Ashhab, Sahel; Fuse, Tomoko; Semba, Kouichi | We propose a cross-resonance-based readout scheme of a superconducting flux qubit, in which a flux qubit is coupled to a resonator, and a microwave flux pulse tuned to the resonator is applied to the flux qubit. | Session 40: Qubit Readout and Open Systems |

610 | Continuous joint measurement of two-qubit fluorescence: quantum dynamics and entanglement | Lewalle, Philippe; Jordan, Andrew | We consider a continuous weak measurement scheme in which two qubit-cavity systems are allowed to fluoresce, and their fluorescence signals are mixed before being routed to a measurement apparatus. | Session 40: Qubit Readout and Open Systems |

611 | High-fidelity detection of information encoded in bosonic modes: Part I | Wang, Christopher; Elder, Salvatore; Reinhold, Philip; Hann, Connor; Chou, Kevin; Lester, Brian; Rosenblum, Serge; Axline, Christopher; Frunzio, Luigi; Jiang, Liang; Schoelkopf, Robert | In this talk, we present a measurement scheme in the circuit quantum electrodynamics (cQED) platform that utilizes repeated QND readouts to suppress measurement infidelity due to both individual readout errors and relaxation. | Session 40: Qubit Readout and Open Systems |

612 | High-fidelity detection of information encoded in bosonic modes: Part II | Elder, Salvatore; Wang, Christopher; Reinhold, Philip; Hann, Connor; Chou, Kevin; Lester, Brian; Rosenblum, Serge; Axline, Christopher; Frunzio, Luigi; Jiang, Liang; Schoelkopf, Robert | We present an experimental demonstration of a recent proposal [Hann et al, Phys. | Session 40: Qubit Readout and Open Systems |

613 | Design of a Cryogenic, Digital Measurement Circuit for Superconducting Qubits | Howington, Caleb; Opremcak, Alexander; Kirichenko, Alex; Mukhanov, Oleg; McDermott, Robert; Plourde, Britton | Design of a Cryogenic, Digital Measurement Circuit for Superconducting Qubits | Session 40: Qubit Readout and Open Systems |

614 | Measuring qubit quasi-probability distributions behind out-of-time-ordered correlators | Mohseninia, Razieh; Gonzalez Alonso, Jose Raul; Waegell, Mordecai; Yunger Halpern, Nicole; Dressel, Justin | We use the method introduced in Phys. Rev. A 98, 012132 (2018) to provide different experimental protocols for obtaining such a QPD in a multi-qubit system. | Session 40: Qubit Readout and Open Systems |

615 | Time-resolved single-shot single-gate RF spin readout in silicon | Pakkiam, Prasanna; Timofeev, Andrey; House, Matthew; Hogg, Mark; Kobayashi, Takashi; Koch, Matthias; Rogge, Sven; Simmons, Michelle | We use this technique to measure a triplet T – to singlet S 0 relaxation time of 0.62ms in precision P-donor quantum dots. | Session 40: Qubit Readout and Open Systems |

616 | Radio-frequency reflectometry of a quantum dot using an ultra-low-noise SQUID amplifier | Schupp, Felix; Ares, Natalia; Mavalankar, Aquila; Griffiths, Jonathan; Jones, Geb; Farrer, Ian; Ritchie, David; Smith, Charles; Briggs, George; Laird, Edward | Here, we demonstrate a 23-fold improvement in capacitance sensitivity by supplementing a cryogenic semiconductor amplifier with a SQUID preamplifier. | Session 40: Qubit Readout and Open Systems |

617 | Advantages of Independent Heat Sinking of a Two-Stage Cryogenic Amplifier for Quantum Dot Readout | Corrigan, Joelle; Knapp, Trevor; Dodson, John; Holman, Nathan; Thorgrimsson, Brandur; McJunkin, Thomas; Neyens, Samuel; MacQuarrie, E.; Foote, Ryan; Edge, Lisa; Coppersmith, Susan; Eriksson, Mark | Advantages of Independent Heat Sinking of a Two-Stage Cryogenic Amplifier for Quantum Dot Readout | Session 40: Qubit Readout and Open Systems |

618 | Fast high fidelity qubit readout of a transmon molecule using longitudinal coupling | Milchakov, Vladimir; Dassonneville, Remy; Buisson, Olivier; Planat, Luca; Leger, Sébastien; Puertas, Javier; Bharadwaj, Karthik Srikanth; Foroughi, Farshad; Naud, Cecile; Hasch-Guichard, Wiebke; Roch, Nicolas | To overcome this, we introduce a transmon molecule based on two transmons coupled by a large inductance, which is inserted inside a 3D-cavity. | Session 40: Qubit Readout and Open Systems |

619 | Correcting measurement errors in multiqubit circuits | Sheldon, Sarah; Bravyi, Sergey; Kandala, Abhinav; McKay, David; Gambetta, Jay | Here we will present one such method, which involves calibrating these errors via measurements of prepared computational states which are used to feed a neural network. | Session 41: Read-out and Measurement of Superconducting Qubits |

620 | Fast dispersive readout of superconducting qubits for fault-tolerant quantum computing | Bultink, Cornelis Christiaan; Vollmer, Rene; Muthusubramanian, Nandini; Beekman, Marc; Rol, Michiel Adriaan; Tarasinski, Brian; DiCarlo, Leonardo | Here, we improve upon the state of the art by combining two techniques to reduce ancilla measurement time and measurement-induced cross-dephasing of data qubits: dedicated Purcell filtering for each qubit and active photon depletion. | Session 41: Read-out and Measurement of Superconducting Qubits |

621 | Crosstalk between transmons during multiqubit readout. | Qi, Zhenyi; Vavilov, Maxim; Kechedzhi, Kostyantyn | Crosstalk between transmons during multiqubit readout. | Session 41: Read-out and Measurement of Superconducting Qubits |

622 | Quantum measurement in superconducting qubits | Hatridge, Michael | I will present data from a recent experiment which uses an interferometric scheme for qubit readout with two-mode squeezed light, achieving a voltage signal-to-noise ratio improvement of ~25 % versus coherent state readout. | Session 41: Read-out and Measurement of Superconducting Qubits |

623 | A tunable Purcell filter design for multiplexed qubit readout | Éthier-Majcher, Gabriel; Najafi-Yazdi, Alireza | In this work, we present a filter design allowing multiplexed qubit readout with Purcell protection. | Session 41: Read-out and Measurement of Superconducting Qubits |

624 | Qubit Measurement by Multi-Channel Driving | Ikonen, Joni; Goetz, Jan; Ilves, Jesper; Keränen, Aarne; Gunyho, Andras; Partanen, Matti; Tan, Kuan; Grönberg, Leif; Vesterinen, Visa; Simbierowicz, Slawomir; Hassel, Juha; Möttönen, Mikko | We theoretically propose and experimentally implement a method to measure a qubit by driving it close to the frequency of a dispersively coupled bosonic mode. | Session 41: Read-out and Measurement of Superconducting Qubits |

625 | Fast Measurement of a Tunable Superconducting Flux Qubit via a Driven Nonlinear Resonator with Applications in Quantum Annealing | Tennant, Daniel; Melanson, Denis; Martinez, Antonio; Yurtalan, Muhammet Ali; Tang, Yongchao; Kim, David; Melville, Alexander; Niedzielski, Bethany; Yoder, Jonilyn; Weber, Steven; Lupascu, Adrian | In this work, we discuss the design as well as preliminary results for a device specifically designed for tunable capacitively shunted flux qubits specifically designed for use in quantum annealers. | Session 41: Read-out and Measurement of Superconducting Qubits |

626 | Realizing a Catch-Disperse-Release read-out of a qubit | Theau, Peronnin; Markovic, Danijela; Ficheux, Quentin; Leghtas, Zaki; Huard, Benjamin | First, we do brief unconditional coherent displacement of the resonator. Then the phase of the stored coherent state grows linearly in time at a rate depending on the state of the qubit. Finally, we release the resonator’s state into the transmission line and measure the phase of the outgoing signal. | Session 41: Read-out and Measurement of Superconducting Qubits |

627 | Tracking non-Markovian quantum dynamics of a superconducting qubit with a recurrent neural network filter | Stevenson, Noah; Mitchell, Bradley; Barzili, Shiva; Mohseninia, Razieh; Dressel, Justin; Siddiqi, Irfan | We use quantum state tracking with continuous weak measurement to experimentally investigate non-Markovianity in a transmon superconducting qubit coupled to a readout resonator. | Session 41: Read-out and Measurement of Superconducting Qubits |

628 | Quantum non-demolition detection of single itinerant microwave photons | Kreikebaum, John Mark; O’Brien, Kevin; Royer, Baptiste; Grimsmo, Arne; Blais, Alexandre; Siddiqi, Irfan | We utilize this long interaction time to achieve high-fidelity measurements of the photon number in the ensemble. | Session 41: Read-out and Measurement of Superconducting Qubits |

629 | Pulsed reset protocol for fixed-frequency superconducting qubits | Egger, Daniel; Werninghaus, Max; Ganzhorn, Marc; Salis, Gian; Fuhrer, Andreas; Mueller, Peter; Filipp, Stefan | We present a simple pulsed qubit reset protocol based on a two-pulse sequence. | Session 41: Read-out and Measurement of Superconducting Qubits |

630 | Diagnostic Single-Qubit Gate Monitoring with Continuous Measurements | Steinmetz, John; Jordan, Andrew | In order to improve the gate fidelity, we use continuous weak measurements to track the quantum map as it develops in time, so as to identify the origin of any deviations from the desired evolution. | Session 41: Read-out and Measurement of Superconducting Qubits |

631 | Full 300mm fin based QD device characterization | George, Hubert C; Thomas, Nicole; Pillarisetty, Ravi; Lampert, Lester; Watson, Thomas; Roberts, Jeanette; Bojarski, Stephanie; Amin, Payam; Torres, Jessica; Metz, Matthew; Zheng, Guoji; Zwerver, Anne-Marije; Boter, Jelmer; Dehollain, Juan Pablo; Eenink, GertJan; Massa, Leonardo; Sabbagh, Diego; Samkharadze, Nodar; Volk, Christian; Wütz, Brian; Veldhorst, Menno; Scappucci, Giordano; Vandersypen, Lieven; Clarke, Jim | In this talk, we will present an in-depth device characterization, and the results from quantum dot devices manufactured in a full 300mm line. | Session 42: Semiconducting QC Architectures and Quantum Photonics |

632 | Simulating Nagaoka Ferromagnetism in a 2×2 Quantum Dot Array | Mukhopadhyay, Uditendu; Dehollain, Juan Pablo; Michal, Vincent; Reichl, Christian; Wegscheider, Werner; Wunsch, Bernhard; Rudner, Mark; Demler, Eugene; Vandersypen, Lieven | Here we present results on simulation of Nagaoka Ferromagnetism in this system. | Session 42: Semiconducting QC Architectures and Quantum Photonics |

633 | Coherent control of individual electron spins in a two-dimensional array of tunnel coupled quantum dots | Meunier, Tristan | Here we demonstrate such two-dimensional coherent control using individual electron spins in arrays up to 9 tunnel-coupled lateral quantum dots. | Session 42: Semiconducting QC Architectures and Quantum Photonics |

634 | A large-scale single-photon source and spin qubit arrays in a photonic integrated chip | Wan, Noel; Lu, Tsung-Ju; Chen, Kevin; Trusheim, Matthew; De Santis, Lorenzo; Walsh, Michael; Bersin, Eric; Mouradian, Sara; Bielejec, Edward; Englund, Dirk | We demonstrate a large array of single-photon sources and spin qubits on a single photonic chip. | Session 42: Semiconducting QC Architectures and Quantum Photonics |

635 | On-chip Integrable Spectrally Uniform Ordered Quantum Dot Single Photon Source Array with High Emission Purity (>98.99%) for Scalable Quantum Optical Networks | Zhang, Jiefei; Chattaraj, Swarnabha; Lu, Siyuan; Madhukar, Anupam | Towards the goal of building scalable on-chip optical networks we have proposed a new paradigm that integrates an array of mesa top single quantum dot (MTSQD) single photon sources (SPSs) with dielectric light manipulating units (LMUs) [1]. | Session 42: Semiconducting QC Architectures and Quantum Photonics |

636 | Tuning Photonic Crystal Cavity Resonances with Phase Change Material GeTe | Mlack, Jerome; Bracker, Allan; Grim, Joel; Carter, Samuel; Kim, Mijin; Kim, Chul Soo; Yakes, Michael; Lee, Bumsu; Gammon, Daniel | We show results of using thin films of such a phase change material, GeTe, to tune cavity resonances independent of local QDs in such devices. | Session 42: Semiconducting QC Architectures and Quantum Photonics |

637 | Integrated Quantum Networks of Mie-resonance based All-Dielectric Optical Circuits with Single Photon Sources for Quantum Entanglement | Chattaraj, Swarnabha; Zhang, Jiefei; Lu, Siyuan; Madhukar, Anupam | Recently we introduced [1] a new approach to on-chip optical circuits based on subwavelength scale dielectric building blocks (DBBs) metastructures integrated with single photon sources (SPSs) such as the mesa-top single quantum dot (MTSQD) ordered array [1] in which a single collective Mie resonance of the DBB metastructure provides all needed five light manipulating functions [2]: (1) SPS emission rate enhancement, (2) emission directionality, (3) wave-guiding (4) beam-splitting and (4) beam-combining. | Session 42: Semiconducting QC Architectures and Quantum Photonics |

638 | Optical locking of a quantum dot electron spin qubit | Bodey, Jonathan; Le Gall, Claire; Stockill, Robert; Gangloff, Dorian; Ethier-Majcher, Gabriel; Atature, Mete | Our work represents versatile spin control and provides a way towards on-chip all-optical spin manipulation. | Session 42: Semiconducting QC Architectures and Quantum Photonics |

639 | 4H-SiC-on-Insulator Platform for Quantum Photonics with Color Centers | Lukin, Daniil; Dory, Constantin; Radulaski, Marina; Sun, Shuo; Vercruysse, Dries; Vuckovic, Jelena | To aid integration of these defects into nanophotonic structures, we develop a 4H-SiC-on-insulator platform based on bonding and thinning techniques. | Session 42: Semiconducting QC Architectures and Quantum Photonics |

640 | Scalable frequency locking of single photon sources for quantum photonic technologies | Carolan, Jacques; Chakraborty, Uttara; Harris, Nicholas; Pant, Mihir; Baehr-Jones, Tom; Hochberg, Michael; Englund, Dirk | Here we present an in situ frequency locking technique that monitors and corrects frequency variations in single photon sources based on microring resonators. | Session 42: Semiconducting QC Architectures and Quantum Photonics |

641 | Event-ready entangled photons from a solid-state single-photon source. | De Almeida, Marcelo; Zakaria, Nor Azwa; Loredo, Juan Carlos; Assis, Leonardo; Cha, Jihun | Here we employ a quantum dot source to demonstrate a 4-qubit Type-II Fusion Entangling Gate [4]. | Session 42: Semiconducting QC Architectures and Quantum Photonics |

642 | Optimized Quantum Photonics in Diamond | Dory, Constantin; Vercruysse, Dries; Yang, Ki Youl; Sapra, Neil; Rugar, Alison; Sun, Shuo; Lukin, Daniil; Piggott, Alexander; Zhang, Jingyuan Linda; Radulaski, Marina; Lagoudakis, Konstantinos; Vuckovic, Jelena | We utilize inverse design optimization and fabrication methods based on quasi-isotropic etching to significantly improve on efficiency, scalability, and functionality of diamond photonics. | Session 42: Semiconducting QC Architectures and Quantum Photonics |

643 | Modeling dopants in silicon: application to atomic-scale Si qubit systems. | Liu, Keyi; Bryant, Garnett; Zielinski, Michal | We present TB calculations using several new corrections including the induced nearest neighbor hopping, the varying screened potential, and the orthogonalization of the on-site wavefunctions. | Session 43: Semiconducting Quantum Computing with Donors |

644 | Using multivalley effective mass theory to probe the phosphorous donor effective potential in silicon | Pendo, Luke; Hu, Xuedong | Here we develop an MEM theory for an electron confined to a phosphorus donor in Silicon, and explore the most useful form of effective potential that would allow us to accurately predict both spectrum and wavefunction of the electron. | Session 43: Semiconducting Quantum Computing with Donors |

645 | Quantum computation and simulation with dopants in silicon | Rogge, Sven | This technique enabled the design and verification of a robust scheme to achieve exchange coupling of an two dimensional array of dopants that is immune to placement errors of the atoms. | Session 43: Semiconducting Quantum Computing with Donors |

646 | Decoherence of donors in silicon at millikelvin temperatures | Bertet, Patrice; Ranjan, Vishal; Albanese, Bartolo; Probst, Sebastian; Zhang, Gengli; Flurin, Emmanuel; Vion, Denis; Esteve, Daniel; Liu, Ren-Bao; Morton, John | I will present measurements of Bismuth donors spin relaxation and coherence times at millikelvin temperatures obtained with a home-made spectrometer working at the quantum limit of sensitivity based on superconducting micro-resonators and Josephson parametric amplifiers [2], and I will discuss the various mechanisms at play. | Session 43: Semiconducting Quantum Computing with Donors |

647 | Desorption and lithographic patterning of halogen-terminated Si(100)-(2×1) using STM | Dwyer, K.J.; DeMell, Jennifer; Dreyer, Michael; Butera, Robert | Here, we present results on the passivation and selective depassivation characteristics of halogen resists (Cl and Br) used for STM lithography on Si(100)-(2×1) at low and elevated temperatures (77 K, 300 K, 400 K). | Session 43: Semiconducting Quantum Computing with Donors |

648 | Suppressing spectral diffusion in phosphorus-doped silicon via optical excitation in high magnetic fields | Zhu, Lihuang; Van Tol, Johan; Ramanathan, Chandrasekhar | Here we show that low-power above-band-gap excitation can also extend the phase memory time of the donor electron spins in a low-concentration (?3.3 – 3.5 × 10 15 cm -3) phosphorus-doped natural abundance silicon sample. | Session 43: Semiconducting Quantum Computing with Donors |

649 | Machine Learning approach to the inverse problem in STM imaging of dopant-based quantum devices | R??a?ski, Piotr; Patera, Martyna; Bryant, Garnett; Zielinski, Michal | Here we propose a theoretical solution to that problem. | Session 43: Semiconducting Quantum Computing with Donors |

650 | Fabrication of Single Donor and Single Electron Transistors for Quantum Technologies | Silver, Rick; Kashid, Ranjit; Wang, Xiqiao; Wyrick, Jonathan; Namboodiri, Pradeep; Schmucker, Scott; Murphy, Andrew; Stewart, Michael; Zimmerman, Neil | We will present the design and characterization of multiple single electron transistors that demonstrate stable coulomb blockade oscillations. | Session 43: Semiconducting Quantum Computing with Donors |

651 | Investigating the impact of laser illumination upon coherence times of electron spin qubits bound to donors in silicon | Wise, David; Panjwani, Naitik; Dhomkar, Siddharth; Morton, John | Here, we present an analysis of the impact of NIR illumination on the coherence of electrons bound to phosphorus donors in silicon. | Session 43: Semiconducting Quantum Computing with Donors |

652 | Electronic transport along atomically placed P ribbons in Si | Koiller, Belita; Dusko, Amintor; Lewenkopf, Caio | We investigate their electronic properties using an effective single-particle approach based on a linear combination of donor orbitals (LCDO), keeping the ground state donor orbitals’ oscillatory behavior due to interference among the states at the Si conduction band minima. | Session 43: Semiconducting Quantum Computing with Donors |

653 | Silicon MOSFET quantum dots with simplified metal-gate geometry | Barrera, Eduardo; Sfigakis, Francois; Aydinoglu, Ferhat; Baugh, Jonathan | Here, we introduce a two metal-layer MOSFET quantum dot device that reduces the number of metal gates and simplifies the dot tune-up procedure. | Session 44: Semiconducting Qubits: Automation of Tune-up |

654 | Single electron charge shuttling in a linear quantum dot array | Mills, Adam; Zajac, David; Gullans, Michael; Schupp, Felix; Hazard, Thomas; Petta, Jason | Here we demonstrate shuttling of a single electron across a linear array of 9 series-coupled Si quantum dots in ~50 ns with an approach that is extendable to larger quantum dot arrays. | Session 44: Semiconducting Qubits: Automation of Tune-up |

655 | Electron shuttling based error-correction architectures using quantum dot qubits | Langrock, Veit; DiVincenzo, David | We address the issue of decoherence for such shuttling devices and present a possible realization of a scalable fault-tolerant quantum memory based on more realistic device models. | Session 44: Semiconducting Qubits: Automation of Tune-up |

656 | Simulating coherent electron shuttling in quantum dots | Buonacorsi, Brandon; Shaw, Benjamin; Baugh, Jonathan | An algorithm is presented that calculates time-dependent voltages that maintain a desired fidelity with the ground state orbital wavefunction. | Session 44: Semiconducting Qubits: Automation of Tune-up |

657 | Algorithm for automated tuning of a quantum dot to the single electron regime. | Lapointe-Major, Maxime; Camirand Lemyre, Julien; Lachance-Quirion, Dany; Rochette, Sophie; Pioro-Ladriere, Michel | In this work, we have developed an algorithm adapted to quantum dots measured by charge detection with a single electron transistor (SET). | Session 44: Semiconducting Qubits: Automation of Tune-up |

658 | Control of a GaAs “QuByte” in the single electron regime – adding dots one-by-one | Volk, Christian; Zwerver, Anne-Marije; Eendebak, Pieter; Diepen, Sjaak; Riggelen, Floor; Mukhopadhyay, Uditendu; Dehollain, Juan Pablo; Hensgens, Toivo; Reichl, Christian; Wegscheider, Werner; Vandersypen, Lieven | We develop a scalable technique, the ‘n+1 strategy’ where, starting from a double QD, subsequent QDs will be added one-by-one. | Session 44: Semiconducting Qubits: Automation of Tune-up |

659 | Towards Autonomous Tuning of Double Quantum Dots | Darulova, Jana; Pauka, Sebastian; Mahoney, Alice; Hornibrook, John; Wiebe, Nathan; Granade, Christopher; Cassidy, Maja; Reilly, David; Troyer, Matthias | In this talk we present an alternative autonomous automated solution for the tuning of gate-defined quantum dots which requires as input only the device layout. | Session 44: Semiconducting Qubits: Automation of Tune-up |

660 | A Machine Learning Approach for Automated Fine-Tuning of Semiconductor Spin Qubits | Teske, Julian David; Humpohl, Simon; Otten, Rene; Bethke, Patrick; Cerfontaine, Pascal; Bluhm, Hendrik | We present an algorithm for the automated fine-tuning of quantum dots, and benchmark its performance by tuning tunnel and lead coupling on a GaAs singlet triplet qubit. | Session 44: Semiconducting Qubits: Automation of Tune-up |

661 | Image Analysis, Automation, and Machine Learning Techniques Applied to MOS Quantum Dot Tune-Up | Mounce, Andrew; Lewis, Phillip; Monical, Cara; Jacobson, N. Tobias; Grine, Albert; Rudolph, Martin; Anderson, John; Wendt, Joel; Pluym, Tammy; Ward, Dan; Larson, Kurt; Lilly, Michael; Carroll, Malcolm | In this talk, I will present image analysis techniques which extract information from transport and charge sensing stability plots. | Session 44: Semiconducting Qubits: Automation of Tune-up |

662 | A Flexible Control System for Quantum Dot Qubits | Messaoudi, Nizar; Badaroudine, Azfar; Njejimana, Larissa; Heintz, Gidget; Genest, Marc-Antoine; Pioro-Ladriere, Michel | This paper discusses the use of commercial FPGA based instruments to implement a spin-qubit control system. | Session 44: Semiconducting Qubits: Automation of Tune-up |

663 | Scalable tuning of InAs quantum dots embedded in photonic structures | Grim, Joel; Bracker, Allan; Zalalutdinov, Maxim; Carter, Samuel; Kozen, Alexander; Kim, Mijin; Kim, Chul Soo; Mlack, Jerome; Yakes, Michael; Lee, Bumsu; Gammon, Daniel | We have developed an approach that addresses this challenge by laser-patterning strain via local phase transitions of a conformal thin film deposited on the surface of photonic architectures. | Session 44: Semiconducting Qubits: Automation of Tune-up |

664 | Deep Reinforcement Learning Based Control of Coherent Transport by Adiabatic Passage of Spin Qubits | Porotti, Riccardo; Tamascelli, Dario; Restelli, Marcello; Prati, Enrico | We apply a technique to find a near-optimal gate pulse sequence without explicitly providing any preliminary knowledge of the underlying physical system to the DRL agent. | Session 44: Semiconducting Qubits: Automation of Tune-up |

665 | Controllable Approximations for Spin Qubit Design – Jacob’s Ladder of Device Modelling | Saraiva, Andre; Escott, Christopher; West, Anderson; Leon, Ross; Zhao, Ruichen; Yang, Henry; Dzurak, Andrew | We review two methods to improve the accuracy of these quantities: the Path Integral Monte Carlo method for tunnel rates and exchange coupling; and the Density Functional Theory applied to the effective mass Hamiltonian for the many electron problem. | Session 44: Semiconducting Qubits: Automation of Tune-up |

666 | GPU-Accelerated Simulations of Single and Two Electron-Spin Qubit Operations in Semiconductor Devices. | Lepage, Hugo; Lasek, Aleksander; Arvidsson Shukur, David; Barnes, Crispin | We present GPU-accelerated simulations that provide valuable insights into how a particle behaves while in the metaphorical “black box” that is the experimental device. | Session 44: Semiconducting Qubits: Automation of Tune-up |

667 | Controlling spatial entanglement in interacting two electrons trapped in superlattices | Pham, Dung; Bharadwaj, Sathwik; Wang, Yuchen; Ram-Mohan, L | Here we develop a fully variational action integral formalism to obtain the coordinate space wavefunctions for two electrons trapped in semiconductor superlattices. | Session 44: Semiconducting Qubits: Automation of Tune-up |

668 | Four-qubit quantum processor in isotopically enriched silicon | Sigillito, Anthony; Loy, James; Zajac, David; Borjans, Felix; Gullans, Michael; Petta, Jason | In this presentation, we will present a four-spin-qubit device architecture. | Session 45: Semiconducting Qubits: Characterization of Electron and Hole Spin Qubits |

669 | Characterization of gate fidelities in a Si/SiGe two-qubit device | Xue, Xiao; Watson, Thomas; Helsen, Jonas; Ward, Daniel; Savage, Donald; Lagally, Max; Coppersmith, Susan; Eriksson, Mark; Wehner, Stephanie; Vandersypen, Lieven | With this new method, we characterized the fidelity of a C-Phase gate with tighter bounds than those in the traditional approach. | Session 45: Semiconducting Qubits: Characterization of Electron and Hole Spin Qubits |

670 | Benchmarking of two-qubit gates for singlet-triplet qubits | Zhang, Chengxian; Wang, Xin | We perform benchmarking to evaluate the performance of two-qubit dynamically corrected gates (DCGs) in the singlet-triplet spin qubit system. | Session 45: Semiconducting Qubits: Characterization of Electron and Hole Spin Qubits |

671 | Noise correlations in a two-qubit Si/SiGe quantum dot device | Boter, Jelmer; Xue, Xiao; Watson, Thomas; Krähenmann, Tobias; Premakumar, Vickram; Ward, Daniel; Savage, Donald; Lagally, Max; Friesen, Mark; Coppersmith, Susan; Eriksson, Mark; Joynt, Robert; Vandersypen, Lieven | We demonstrate this method by artificially adding (anti-) correlated noise and use it characterize the noise in our system. | Session 45: Semiconducting Qubits: Characterization of Electron and Hole Spin Qubits |

672 | Magnetic-Field Effects on Error and Leakage in Randomized Benchmarking of a Si/SiGe Triple-dot Qubit | Jones, Cody | This talk discusses the magnetic-field-dependent impacts of three types of magnetic gradients: magnetic screening gradients due to the Meissner effect in superconducting gates, interface-spin-orbit effects, and contact hyperfine interactions including the full vector of nuclear magnetization. | Session 45: Semiconducting Qubits: Characterization of Electron and Hole Spin Qubits |

673 | Analyzing the fidelity of a singlet-triplet spin-orbit qubit in silicon using gate set tomography | Bureau-Oxton, Chloe; Rudinger, Kenneth; Jacobson, Noah; Ward, Daniel; Anderson, John; Manginell, Ronald; Wendt, Joel; Pluym, Tammy; Lilly, Michael; Pioro-Ladriere, Michel; Luhman, Dwight; Carroll, Malcolm | In this work, we use gate set tomography to analyze the fidelity of these gates. | Session 45: Semiconducting Qubits: Characterization of Electron and Hole Spin Qubits |

674 | Measurements of capacitive coupling in two double dots in Si/SiGe for application in two qubit gates | Neyens, Samuel; MacQuarrie, Evan; Dodson, John; Holman, Nathan; Thorgrimsson, Brandur; McJunkin, Thomas; Corrigan, Joelle; Palma, Mario; Edge, Lisa; Friesen, Mark; Coppersmith, Susan; Eriksson, Mark | We present measurements of a Si/SiGe quantum dot device made with overlapping self-oxidized Al gates. | Session 45: Semiconducting Qubits: Characterization of Electron and Hole Spin Qubits |

675 | Detuning dependence of capacitive coupling for quantum dot hybrid qubits | Setser, Arman; Kestner, Jason | We derive the coupling form between two capacitively coupled qubits, each consisting of three electrons in a double quantum dot (i.e., two hybrid qubits), and show how the effective coupling behaves as a function of detuning. | Session 45: Semiconducting Qubits: Characterization of Electron and Hole Spin Qubits |

676 | Induced quantum dot probe for qubit and material characterization | Tahan, Charles; Shim, Yun-Pil; Ruskov, Rusko; Hurst, Hilary | We propose a non-destructive means of characterizing quantum dot parameters across a semiconductor wafer by inducing a quantum dot on the material system of interest with a separate probe chip that can also house the measurement circuitry. | Session 45: Semiconducting Qubits: Characterization of Electron and Hole Spin Qubits |

677 | Device-level modeling of hole quantum dot qubits in germanium | Brickson, Mitchell; Baczewski, Andrew; Hardy, Will; Jacobson, Noah; Lu, Tzu-Ming; Maurer, Leon; Luhman, Dwight | In this talk, we will describe ongoing work towards developing comprehensive models of these systems to facilitate the design and optimization of devices and the rationalization of experiments. | Session 45: Semiconducting Qubits: Characterization of Electron and Hole Spin Qubits |

678 | EDSR of a single heavy hole in a lateral GaAs/AlGaAs quantum dot qubit | Studenikin, Sergei; Takahashi, Motoi; Austing, Guy; Bogan, Alex; Gaudreau, Louis; Korkusinski, Marek; Zawadzki, Piotr; Sachrajda, Andrew; Tracy, Lisa; Reno, John; Hargett, Terry | Here we report single hole electric dipole spin resonance (EDSR) measurements over the 20-50 GHz range taking advantage of the strong spin-orbit coupling. | Session 45: Semiconducting Qubits: Characterization of Electron and Hole Spin Qubits |

679 | Origins and enhancement of hole spin-mixing in InAs quantum dot molecules | Lin, Arthur; Doty, Matthew; Bryant, Garnett | Through an atomistic tight-binding model and perturbative field analysis, we discuss the origin of spin-mixing and compare it with previous models using effective Hamiltonians. | Session 45: Semiconducting Qubits: Characterization of Electron and Hole Spin Qubits |

680 | Controlling hole spin in quantum dots: Rashba or not Rashba | Bryant, Garnett; Lin, Arthur | Tight-binding theory is used to study GaAs/AlAs QDs with a graded alloy describing the QD interface to minimize Rashba effects of sharp interfaces. | Session 45: Semiconducting Qubits: Characterization of Electron and Hole Spin Qubits |

681 | A silicon metal-oxide-semiconductor quantum dot patterned with nano-imprint lithography | Rooney, John; Penthorn, Nicholas; Schoenfield, Joshua; Jiang, HongWen | This work offers a path toward reliable quantum dot operation in MOS by improving fabrication techniques to reduce charge impurities. | Session 46: Semiconducting Qubits: Interface Characterization |

682 | Vibrational modes at the Si/SiO2 interface detected by pulse electron spin resonance | Fanciulli, Marco; Belli, Matteo; de Sousa, Rogério | The experiment together with a theory of the spin relaxation mechanism which involves TTLSs provide a novel method to address the boson peak and other issues related to the role of the TTLSs in determining noise and decoherence in qubits and other sensitive devices. | Session 46: Semiconducting Qubits: Interface Characterization |

683 | Fidelity of strongly driven electric dipole spin resonance | Tokura, Yasuhiro | In this report, we study the effect of the noise by strongly-driven orbital motion on the fidelity of the spin. | Session 46: Semiconducting Qubits: Interface Characterization |

684 | Low power electric dipole spin resonance in silicon: theory | Benito, Monica; Petta, Jason; Burkard, Guido; Croot, Xanthe; Mi, Xiao | Here, we present a theoretical investigation of an efficient novel mechanism in silicon quantum dots to induce single electron coherent spin rotations relying on an external magnetic field gradient. | Session 46: Semiconducting Qubits: Interface Characterization |

685 | Low power electric dipole spin resonance in silicon: experiment | Croot, Xanthe; Benito, Monica; Mi, Xiao; Burkard, Guido; Petta, Jason | Here we present experimental results using a new technique for low-power EDSR in silicon with micromagnets, in a step towards scalable power budgets for large-scale spin-based quantum processors. | Session 46: Semiconducting Qubits: Interface Characterization |

686 | Charge offset drift in single electron devices containing aluminum oxide | Stein, Ryan; Hong, Yanxue; Hu, Binhui; Murphy, Andrew; Zimmerman, Neil; Pomeroy, Joshua; Stewart, Michael | Here, we have fabricated two different types of SEDs: all-metal Al/AlOx/Al tunnel junction-based devices and tunable barrier silicon metal-oxide-semiconductor (MOS) devices. | Session 46: Semiconducting Qubits: Interface Characterization |

687 | Probing decoherence at an atom-defect quantum interface | Han, Xue; Cao, Alec; Jenkins, Alec; Bluvstein, Dolev; Ma, Shuo; Mukherjee, Kunal; Weld, David; Jayich, Ania | We present measurements of the decoherence and relaxation rates of shallow NV centers interacting with atomic adsorbates deposited at thicknesses varying from angstroms to nanometers. | Session 46: Semiconducting Qubits: Interface Characterization |

688 | Ultra-thin body buried oxide 28nm FD-SOI platform for silicon quantum dots | Rohrbacher, Claude; Rochette, Sophie; Camirand Lemyre, Julien; Bédard-Vallée, Alexandre; Lemieux, Pascal; Galy, Philippe; Bedecarrats, Thomas; Arnaud, Franck; Drouin, Dominique; Pioro-Ladriere, Michel | Here we present a UTBB FD-SOI platform that is designed to operate as a transistor and host quantum dots. | Session 46: Semiconducting Qubits: Interface Characterization |

689 | Magnetotransport of metal-oxide-semiconductor devices fabricated on highly enriched 28Si | Ramanayaka, Aruna; Tang, Ke; Kim, Hyun-soo; Hagmann, Joseph; Stein, Ryan; Stewart, Michael; Richter, Curt; Pomeroy, Joshua | At NIST we have developed a method to grow isotopically enriched 28Si, which provides the unique advantage of targeting a desired enrichment anywhere between natural abundance and the highest possible enrichment > 99.99998 % 28Si isotopic fractions. | Session 46: Semiconducting Qubits: Interface Characterization |

690 | New Linear-Optical Approach to Quantum Information Processing and Quantum Simulation | Sergienko, Alexander; Simon, David; Osawa, Shuto | Here we give an overview of the properties and potential applications of these multiports. | Session 46: Semiconducting Qubits: Interface Characterization |

691 | Manipulation of entanglement sudden death in an all-optical experimental setup | Singh, Ashutosh; Sinha, Urbasi | Here, we aim to discuss an all-optical-experimental implementation of the NOT operations that can hasten, delay, or avert ESD, all depending on when it is applied during the process of decoherence for the polarization entangled photonic qubit system[1]. | Session 46: Semiconducting Qubits: Interface Characterization |

692 | Implementation and Simulation of Electrostatically Controlled Quantum Dots in CMOS Technology | Leipold, Dirk; Leipold, Hannes; Leipold, Lutz; Blokhina, Elena; Giounanlis, Panagiotis; pomorski, Krzysztof; Staszewski, Robert; Bashir, Imran; Maxim, George; Asker, Mike; cetintepe, Cagri; Esmailiyan, Ali; Wang, Hongying; Siriburanon, Teerachot | We describe the implementation including integrated control structure | Session 46: Semiconducting Qubits: Interface Characterization |

693 | Quantum control and entanglement of 6+ spin qubits in diamond | Bradley, Conor; Randall, Joe; Berrevoets, Remon; Abobeih, Mohamed; Degen, Maarten; Dobrovitski, Viatcheslav; Taminiau, Tim Hugo | In this talk, I will show how a novel two-qubit gate – based upon radio frequency driving interleaved with dynamical decoupling – enables quantum entanglement of 6+ spins. | Session 47: Semiconducting Qubits: Quantum Computing with Defects |

694 | High-fidelity control of a multi-qubit network node in diamond | Randall, Joe; Bradley, Conor; Berrevoets, Remon; Degen, Maarten; Abobeih, Mohamed; Dobrovitski, Viatcheslav; Taminiau, Tim Hugo | I will present our experimental demonstration of a novel method to perform selective electron-nuclear two-qubit gates. | Session 47: Semiconducting Qubits: Quantum Computing with Defects |

695 | Room-Temperature Quantum Error Correction with Nitrogen-Vacancy Centers | Chen, Mo; Layden, David; Cappellaro, Paola | Therefore, instead of traditional FT QEC, we focus on hardware-efficient QEC that demands less redundancy and imposes less overhead penalty. | Session 47: Semiconducting Qubits: Quantum Computing with Defects |

696 | Laser Written Diamond Optoelectronic Devices for use in Quantum Computing | Lekhai, Yashna; Stephen, Colin; Chen, Yu-Chen; Weng, Laiyi; Hill, Paul; Johnson, Sam; Frangeskou, Angelo; Diggle, Phil; Strain, Michael; Gu, Erdan; Green, Ben; Newton, Mark; Smith, Jason; Salter, Patrick; Morley, Gavin | Laser Written Diamond Optoelectronic Devices for use in Quantum Computing | Session 47: Semiconducting Qubits: Quantum Computing with Defects |

697 | Nitrogen vacancy (NV) centres in diamond for fun and profit | Stephen, Colin; Bose, Sougato; Frangeskou, Angelo; Rahman, ATM Anishur; Barker, Peter; Gines, Laia; Mandal, Soumen; Dale, Matthew; Lekhai, Yashna; Weng, Laiyi; Hill, Paul; Johnson, Sam; Diggle, Phil; Strain, Michael; Gu, Erdan; Newton, Mark; Green, Ben; Williams, Oliver; Smith, Jason; Salter, Patrick; Morley, Gavin | We have proposed [1] and begun developing [2-4] an experiment in which a 1 ?m diamond containing an NV centre would be put into a superposition of being in two places at once with a superposition distance of 1 ?m. | Session 47: Semiconducting Qubits: Quantum Computing with Defects |

698 | Near-term protocols for deterministic photonic graph state generation | Russo, Antonio; Barnes, Edwin; Economou, Sophia | Here we present near-term experimentally realizable protocols for the deterministic production of graph states, with explicit recipes for nitrogen-vacancy centers in diamond and self-assembled quantum dots. | Session 47: Semiconducting Qubits: Quantum Computing with Defects |

699 | Mechanical driving of nitrogen-vacancy centers in diamond | Lyzwa, Dominika; Cappellaro, Paola | We develop a theoretical framework for this increase in the dephasing time for dynamic mechanical driving. | Session 47: Semiconducting Qubits: Quantum Computing with Defects |

700 | Engineering nitrogen-vacancy center electron-phonon coupling with a semi-confocal diamond acoustic resonator | Chen, Huiyao; Jiang, Alex; Opondo, Noah; Bhave, Sunil; Fuchs, Gregory | In this talk, we present the design and fabrication of a semi-confocal diamond BAR device with f*Q product >10^{13}. | Session 47: Semiconducting Qubits: Quantum Computing with Defects |

701 | Fabrication of High Quality Quantum Emitters in Diamond Nanostructures | Walsh, Michael; Bersin, Eric; Mouradian, Sara; Wan, Noel; Englund, Dirk | We demonstrate an emitter-device alignment technique enabling fabrication of photonic devices registered to nitrogen-vacancy centers (NVs). | Session 47: Semiconducting Qubits: Quantum Computing with Defects |

702 | Spectral stabilization and indistinguishible photon generation by electromechanical tuning of diamond color centers in nanophotonic devices | Machielse, Bartholomeus; Bogdanovic, Stefan; Meesala, Srujan; Burek, Michael; Chia, Cleaven; Joe, Graham; Gauthier, Scarlett; Chalupnik, Michelle; Holzgrafe, Jeffrey; Shao, Linbo; Atikian, Haig; Lukin, Mikhail; Loncar, Marko | We present a platform for nano-electromechanically stabilizing and tuning the SiV spectral lines inside waveguides and cavities with emitter tuning range 3 times larger than the SiV inhomogeneous distribution. | Session 47: Semiconducting Qubits: Quantum Computing with Defects |

703 | Optical Characterization of Single Tin-Vacancy Centers in Diamond | Rugar, Alison; Sun, Shuo; Dory, Constantin; Vuckovic, Jelena | In this talk, we will present our recent experimental characterization of the optical and spin properties of single SnV color centers in diamond nanopillars. | Session 47: Semiconducting Qubits: Quantum Computing with Defects |

704 | All-electron calculation of spin-spin interactions | Ghosh, Krishnendu; Ma, He; Gavini, Vikram; Galli, Giulia | We show that real-space, finite element DFT calculations provide robust estimates of ZFS and HF for both molecules and solids and we present results for molecules and the nitrogen-vacancy center in diamond. | Session 47: Semiconducting Qubits: Quantum Computing with Defects |

705 | Deep-center defects in semiconductors | Romanova, Mariya; Sjakste, Jelena; Vast, Nathalie | The aim of this work is to obtain a reference method to model the electronic properties of the NV-center in diamond for the purpose of magnetic sensing. | Session 47: Semiconducting Qubits: Quantum Computing with Defects |

706 | Manipulation of electronic defects in hexagonal boron nitride | Urbach, Elana; Sumarac, Tamara; Knowles, Helena; Sanchez-Yamagishi, Javier; Choi, Soonwon; Dwyer, Bo; Andersen, Trond; Lukin, Mikhail | In this experiment we use an NV center to manipulate electronic defects in and near hBN, and we are working towards utilizing these defects for better initialization and control of local nuclear spins. | Session 47: Semiconducting Qubits: Quantum Computing with Defects |

707 | Auto-Locking Overhauser Field to the Sweet Point for an Electron Spin by Quantum Weak Measurement of Nuclear Spins | Zhang, Gengli; Jacques, Vincent; Bertet, Patrice; Liu, Renbao | Here we propose a new dynamical nuclear polarization (DNP) scheme that can auto-lock the Overhauser field to the sweet point of the nitrogen vacancy (NV) center. | Session 47: Semiconducting Qubits: Quantum Computing with Defects |

708 | Coupling superconducting qubits to traveling surface acoustic wave phonons | Dumur, Etienne; Satzinger, Kevin; Zhong, Youpeng; Chang, Hung-Shen; Peairs, Gregory; Chou, Ming-Han; Bienfait, Audrey; Conner, Christopher; Grebel, Joel; Povey, Rhys; Cleland, Andrew | We examine the influence of the material properties, coupling strategy, acoustic velocity and design on the performance of the state transfer. | Session 48: Semiconducting Spin Qubits, Photonic and Phononic Coupling |

709 | Quantum State Transfer Using Surface Acoustic Wave Phonons | Bienfait, Audrey; Satzinger, Kevin; Zhong, Youpeng; Chang, Hung-Shen; Chou, Ming-Han; Conner, Christopher; Dumur, Etienne; Grebel, Joel; Peairs, Gregory; Povey, Rhys; Cleland, Andrew | Here, we explore the coherent coupling of superconducting qubits to propagating SAWs. | Session 48: Semiconducting Spin Qubits, Photonic and Phononic Coupling |

710 | Giant Atom Bounded in Continuum | Guo, Shangjie; Wang, Yidan; Purdy, Thomas; Taylor, Jacob | We find a toy model that captures these effects while being exactly solvable. | Session 48: Semiconducting Spin Qubits, Photonic and Phononic Coupling |

711 | Solid-state quantum interfaces of spins and photons | Atature, Mete | In this talk, I will present an overview of the current progress to overcome such challenges for solid-state spin-photon interfaces in two example platforms: First, I will highlight the diamond group-IV vacancy centres and their promise to combine desirable optical and spin properties. Then, I will finish with the semiconductor quantum dots and their potential to transform their nuclei from nuisance to resource. | Session 48: Semiconducting Spin Qubits, Photonic and Phononic Coupling |

712 | Tunable coupling of a double quantum dot spin system to a mechanical resonator | Carter, Samuel; Bracker, Allan; Yakes, Michael; Zalalutdinov, Maxim; Kim, Mijin; Kim, Chul Soo; Lee, Bumsu; Gammon, Daniel | Here we use pairs of coupled InAs quantum dots embedded within GaAs cantilevers to achieve high spin-mechanical coupling through strain. | Session 48: Semiconducting Spin Qubits, Photonic and Phononic Coupling |

713 | Coupling a mechanical oscillator to a parametric amplifier | Zoepfl, David; Juan, Mathieu; Schneider, Christian; Kirchmair, Gerhard | By sideband cooling the cantilever – a macroscopic object – we aim to reach the quantum mechanical ground state. | Session 48: Semiconducting Spin Qubits, Photonic and Phononic Coupling |

714 | Hardware-efficient quantum random access memory using hybrid quantum acoustic systems | Hann, Connor; Zou, Chang-Ling; Zhang, Yaxing; Chu, Yiwen; Schoelkopf, Robert; Girvin, Steven; Jiang, Liang | As an alternative, we propose the use of off-resonant interactions that only virtually excite the qubit. | Session 48: Semiconducting Spin Qubits, Photonic and Phononic Coupling |

715 | Toward the preparation of sub-Poissonian states in a low frequency mechanical oscillator | Ma, Xizheng; Viennot, Jeremie; Kotler, Shlomi; Lehnert, Konrad | We propose a protocol for the preparation of one type of non-classical state, the sub-Poissonian state. | Session 48: Semiconducting Spin Qubits, Photonic and Phononic Coupling |

716 | Resolving Phonon Number States with an Acoustic Ramsey Interferometer | Sletten, Lucas; Moores, Bradley; Lehnert, K. | Here, we combine a multi-mode SAW cavity with a qubit whose transducer is spatially engineered to enter the strong dispersive regime. | Session 48: Semiconducting Spin Qubits, Photonic and Phononic Coupling |

717 | Nonexponential decay of a giant artificial atom | Andersson, Gustav; Suri, Baladitya; Guo, Lingzhen; Aref, Thomas; Delsing, Per | We demonstrate signatures of this non-Markovianity in the frequency spectrum as well as time domain relaxation of the giant atom. | Session 48: Semiconducting Spin Qubits, Photonic and Phononic Coupling |

718 | Strong coupling of a transmon qubit and a phononic crystal cavity array | Arrangoiz-Arriola, Patricio; Wollack, Alex; Pechal, Marek; Wang, Zhaoyou; Jiang, Wentao; McKenna, Timothy; Safavi-Naeini, Amir | Building upon our previous work, we now demonstrate coupling of a transmon qubit to an array of PCCs with mode frequencies in the 2.0-2.4 GHz range. | Session 48: Semiconducting Spin Qubits, Photonic and Phononic Coupling |

719 | Single-photon emission driven by a surface acoustic wave in a lateral undoped GaAs/AlGaAs n-i-p junction, resolved in time, position and energy | Rubino, Antonio; Hsiao, Tzu-Kan; Chung, Yousun; Son, Seok-Kyun; Hou, Hangtian; Pedros, Jorge; Nasir, Ateeq; Ethier-Majcher, Gabriel; Stanley, Megan; Phillips, Richard; Mitchell, Thomas; Griffiths, Jonathan; Farrer, Ian; Ritchie, David; Ford, Christopher J | We observe SAW-driven light emission. | Session 48: Semiconducting Spin Qubits, Photonic and Phononic Coupling |

720 | Demonstration of the Generalized Kennedy Receiver as a Near Quantum-Optimal Measurement for the Discrimination of Weak Classical Optical States | Habif, Jonathan; Jagannathan, Arunkumar | We describe an experimental testbed demonstrating quantum measurements on a single spatio-temporal, polarization mode, photon-starved classical state of light. | Session 48: Semiconducting Spin Qubits, Photonic and Phononic Coupling |

721 | Spin Qubits at Intel | Clarke, Jim | Spin Qubits at Intel | Session 49: Silicon Spin Qubits |

722 | A novel Si/SiGe heterostructure for quantum dot spin qubits | McJunkin, Thomas; MacQuarrie, Evan; Neyens, Samuel; Thorgrimsson, Brandur; Corrigan, Joelle; Dodson, John; Savage, Donald; Lagally, Max; Friesen, Mark; Coppersmith, Susan; Eriksson, Mark | We report Shubnikov-de Haas and quantum Hall measurements, finding a transport mobility in excess of 100,000 cm 2/(V s) at 6 x 10 11 cm -2 carrier density and a series of stable oscillations in measurements of the longitudinal voltage as a function of magnetic field and carrier density (a fan diagram). | Session 49: Silicon Spin Qubits |

723 | Coherent control of a semiconductor quantum dot qubit, encoded by valley-states in Si | Penthorn, Nicholas; Schoenfield, Joshua; Jiang, HongWen | In this talk, we demonstrate the coherent control of a semiconductor quantum dot qubit, encoded by valley-states in Si. | Session 49: Silicon Spin Qubits |

724 | Spin-Blockade Spectroscopy of Si/SiGe Quantum Dots | Chen, Edward | We introduce a technique for measuring the singlet-triplet energy splitting in undoped, accumulation-mode Si/SiGe quantum dots [1]. | Session 49: Silicon Spin Qubits |

725 | Valley and orbital state spectroscopy of a Si/SiGe triple quantum dot | Dodson, John; Baer, Joelle; Abadillo-Uriel, Jose Carlos; Holman, Nathan; Knapp, Trevor; Thorgrimsson, Brandur; MacQuarrie, Evan; Neyens, Samuel; McJunkin, Thomas; Foote, Ryan; Edge, Lisa; Friesen, Mark; Coppersmith, Susan; Eriksson, Mark | Here we present measurements of valley and orbital energies using excited state spectroscopy in a triple quantum dot fabricated using an Al-Al xO 1-x-Al overlapping gate design. | Session 49: Silicon Spin Qubits |

726 | Energy Spectra of Few-Electron Si Quantum Dots | Ercan, Ekmel; Coppersmith, Susan; Friesen, Mark | In this talk, we theoretically study the energy spectra of multielectron dots in Si/SiGe quantum wells, including valley effects and disorder at the quantum well interface. | Session 49: Silicon Spin Qubits |

727 | Effect of an Interface step on Tunnel Coupling and Energy Spectrum in a Si/SiGe double quantum dot | Tariq, Bilal; Hu, Xuedong | Here we study the effect of interface steps on the spectrum and particularly tunnel coupling in a double quantum dot. | Session 49: Silicon Spin Qubits |

728 | Nuclear Dynamics in Isotopically Enhanced Silicon Spin Qubits | Ladd, Thaddeus | This talk will survey these various results and provide rough models for these observations, and will include a discussion of the challenges for efforts to model complex dipole-dipole behavior using more quantitative many-body spin models. | Session 49: Silicon Spin Qubits |

729 | Spin relaxation and dephasing in a 28SiGe QD with nanomagnet | Struck, Tom; Hollmann, Arne; Langrock, Veit; Leonhardt, Tim; Schmidbauer, Andreas; Schauer, Floyd; Neumann, Christian; Abrosimov, Nikolay; Bougeard, Dominique; Schreiber, Lars | We find a maximum T 1 = 480 ms and present a detailed study of the spin relaxation time T 1 as a function of magnetic field. | Session 49: Silicon Spin Qubits |

730 | Charge noise induced spin decoherence in a double quantum dot: Effects of a micromagnet | Zhao, Xinyu; Hu, Xuedong | Our results present a systematic approach to study decoherence processes caused by charge noise, particularly for quantum dots in an inhomogeneous magnetic field. | Session 49: Silicon Spin Qubits |

731 | Spin decoherence in a quantum dot due to micro-magnets | Huang, Peihao; Hu, Xuedong | In this work, we study spin decoherence in a quantum dot mediated by the magnetic field gradient created by micro-magnets. | Session 49: Silicon Spin Qubits |

732 | Targeted enrichment of 28Si for quantum computing | Tang, Ke; Kim, Hyun-soo; Ramanayaka, Aruna; Simons, David; Pomeroy, Joshua | A model predicting the residual 29Si isotope fraction and the corresponding secondary ion mass spectrometry (SIMS) analysis are presented. | Session 49: Silicon Spin Qubits |

733 | Cavity-less circuit quantum electrodynamics of a fluxonium artificial atom – Design | Xiong, Haonan; Lin, Yen-Hsiang; Cottet, Nathanael; Nguyen, Long; Mencia, Ray; Somoroff, Aaron; Manucharyan, Vladimir | We simultaneously achieved a strong coupling of a high-frequency “cycling” transition (0?3 or 1?2) to the traveling waves and a complete suppression of the spontaneous emission of the low-frequency qubit transition (0?1). | Session 50: Superconducting Circuits: Fluxonium and Superinductance Devices |

734 | Cavity-less circuit quantum electrodynamics of a fluxonium artificial atom – Experiment | Lin, Yen-Hsiang; Xiong, Haonan; Cottet, Nathanael; Nguyen, Long; Mencia, Ray; Somoroff, Aaron; Manucharyan, Vladimir | We simultaneously achieved a strong coupling of a high-frequency “cycling” transition (0?3 or 1?2) to the traveling waves and a complete suppression of the spontaneous emission of the low-frequency qubit transition (0?1). | Session 50: Superconducting Circuits: Fluxonium and Superinductance Devices |

735 | Single-Shot Readout of Fluxonium Qubits. | Nesterov, Konstantin; Pechenezhskiy, Ivan; Nguyen, Long; Lin, Yen-Hsiang; Somoroff, Aaron; Mencia, Ray; Manucharyan, Vladimir; Vavilov, Maxim | We discuss the possibility of the single-shot readout of fluxonium superconducting qubits [1] based on the preparation of the “bright” and “dark” cavity states. | Session 50: Superconducting Circuits: Fluxonium and Superinductance Devices |

736 | Nanowire Superinductance Fluxonium Qubit | Hazard, Thomas; Gyenis, Andras; Di Paolo, Agustin; Asfaw, Abraham; Blais, Alexandre; Lyon, Stephen; Houck, Andrew | We characterize a fluxonium qubit consisting of a Josephson junction inductively shunted with a NbTiN nanowire superinductance. | Session 50: Superconducting Circuits: Fluxonium and Superinductance Devices |

737 | Fast qubit reset of a low frequency fluxonium circuit | Cottet, Nathanael; Stevens, Jeremy; Huard, Benjamin | We present and characterize two initialization schemes on a low frequency fluxonium circuit. | Session 50: Superconducting Circuits: Fluxonium and Superinductance Devices |

738 | Towards a fluxonium-based quantum processor I: non-interacting qubits | Somoroff, Aaron; Nguyen, Long; Lin, Yen-Hsiang; Mencia, Ray; Pechenezhskiy, Ivan; Nesterov, Konstantin; Vavilov, Maxim; Manucharyan, Vladimir | We describe our progress in experimentally realizing a microwave-activated two-qubit gate with capacitively coupled fluxonium qubits. | Session 50: Superconducting Circuits: Fluxonium and Superinductance Devices |

739 | Towards a fluxonium-based quantum processor II: interacting qubits | Nguyen, Long; Somoroff, Aaron; Lin, Yen-Hsiang; Mencia, Ray; Pechenezhskiy, Ivan; Nesterov, Konstantin; Vavilov, Maxim; Manucharyan, Vladimir | We describe our progress in experimentally realizing a microwave-activated two-qubit gate with capacitively coupled fluxonium qubits. | Session 50: Superconducting Circuits: Fluxonium and Superinductance Devices |

740 | Coherence of a granular aluminum fluxonium qubit | Spiecker, Martin; Gruenhaupt, Lukas; Gusenkova, Daria; Maleeva, Nataliya; Skacel, Sebastian; Takmakov, Ivan; Valenti, Francesco; Winkel, Patrick; Rotzinger, Hannes; Ustinov, Alexey; Pop, Ioan-Mihai | We present a fluxonium qubit employing a granular aluminum superinductor with coherence times T 1 up to 23 ?s and T 2 R up to 30 ?s at the flux bias sweet spot. | Session 50: Superconducting Circuits: Fluxonium and Superinductance Devices |

741 | Design and fabrication of a granular aluminum fluxonium qubit | Gruenhaupt, Lukas; Spiecker, Martin; Gusenkova, Daria; Maleeva, Nataliya; Skacel, Sebastian; Takmakov, Ivan; Valenti, Francesco; Winkel, Patrick; Rotzinger, Hannes; Ustinov, Alexey; Pop, Ioan-Mihai | We present a superconducting fluxonium qubit employing a superinductor with impedance Z > R Q, fabricated from a grAl thin film, in-situ integrated with a conventional Al/AlOx/Al Josephson junction. | Session 50: Superconducting Circuits: Fluxonium and Superinductance Devices |

742 | Circuit-QED Studies of Josephson Junction Arrays in the Quantum Regime | Ikegami, Hiroki; Raj, Cosmic; Nakamura, Yasunobu | Here we use the experimental technique to explore JJAs in the quantum regime. We find that the temperature at which a peak appears in the cavity loss decreases when the charging energy becomes more dominant than the Josephson energy, i.e., the quantum effect becomes more significant. | Session 50: Superconducting Circuits: Fluxonium and Superinductance Devices |

743 | Implementation of ?-periodic Josephson Elements for Topologically Protected Charge-Parity Qubits | Liu, Yebin; Dodge, Kenneth; Senatore, Michael; Zhu, Shaojiang; Naveen, FNU; Shearrow, Abigail; Schlenker, Francisco; Klots, Andrey; Faoro, Lara; Ioffe, Lev; McDermott, Robert; Plourde, B.L.T. | We describe the fabrication of these arrays and experiments to characterize the periodicity with phase by incorporating the array into an rf SQUID. | Session 50: Superconducting Circuits: Fluxonium and Superinductance Devices |

744 | Granular aluminum: A source of non-linearity for superconducting quantum circuits | Winkel, Patrick; Rieger, Dennis; Gruenhaupt, Lukas; Borisov, Kiril; Maleeva, Nataliya; Spiecker, Martin; Ustinov, Alexey; Wernsdorfer, Wolfgang; Pop, Ioan-Mihai | We model the cQED properties of grAl microwave resonators using an effective array of Josephson junctions, and obtain self-Kerr coefficients that are inversely proportional to the grAl volume and the critical current density [3]. | Session 50: Superconducting Circuits: Fluxonium and Superinductance Devices |

745 | Phase Transitions and Edge States in Fluxonium Qubit Systems | Ozguler, A. Baris; Manucharyan, Vladimir; Dykman, Mark; Vavilov, Maxim | In this talk, we discuss the phase diagram of the fluxonium chain. | Session 50: Superconducting Circuits: Fluxonium and Superinductance Devices |

746 | Intrinsically Error Protected Superconducting Architecture Based on Superinductance | Gyenis, Andras; Hazard, Thomas; Di Paolo, Agustin; Vrajitoarea, Andrei; Blais, Alexandre; Koch, Jens; Houck, Andrew | Here, we introduce the soft-0-? qubit: a twist on the original 0-? qubit proposal that relaxes some of the constraints on the qubit design parameters. | Session 50: Superconducting Circuits: Fluxonium and Superinductance Devices |

747 | Characterizing Granular Aluminum in Superconducting Circuits | Place, Alexander; Hazard, Thomas; Gyenis, Andras; Houck, Andrew | Here, we present a new method to deposit granular aluminum in addition to spectroscopic and time domain measurements of granular aluminum-based superconducting qubits. | Session 50: Superconducting Circuits: Fluxonium and Superinductance Devices |

748 | Broadband design of parametric non-reciprocal devices | Naaman, Ofer; Aumentado, Jose; Martinis, John | In this talk, we outline a procedure for designing parametric devices with bandwidths up to ~1 GHz. | Session 51: Superconducting Circuits: Josephson Amplifiers and Non-reciprocal Devices |

749 | Quantum discord in squeezed microwaves | Fedorov, Kirill; Pogorzalek, Stefan; Xu, Minxing; Renger, Michael; Fischer, Michael; Xie, Edwar; Chen, Qi-Ming; Marx, Achim; Deppe, Frank; Gross, Rudolf | We exploit asymmetric noise injection into these TMS states which allows us to demonstrate the robustness of quantum discord as opposed to the sudden death of entanglement. | Session 51: Superconducting Circuits: Josephson Amplifiers and Non-reciprocal Devices |

750 | Proposal for a novel directional parametric amplifier requiring no external nonreciprocal components | Lingenfelter, Andrew; Sivak, Volodymyr; Shankar, Shyam; Devoret, Michel | We propose a novel four-port phase-preserving parametric amplifier that satisfies all of the above requirements. | Session 51: Superconducting Circuits: Josephson Amplifiers and Non-reciprocal Devices |

751 | Theoretical study of nonreciprocal microwave transmission based on Gebhard-Ruckenstein hopping | Masuda, Shumpei; Kono, Shingo; Suzuki, Keishi; Tokunaga, Yuuki; Nakamura, Yasunobu; Koshino, Kazuki | In this presentation, we theoretically investigate the nonreciprocal microwave transmission based on the Gebhard-Ruckenstein hopping. | Session 51: Superconducting Circuits: Josephson Amplifiers and Non-reciprocal Devices |

752 | Exploiting the Kerr-free point of a SNAIL for improvement of dynamic range in parametric amplifiers | Sivak, Volodymyr; Lingenfelter, Andrew; Frattini, Nicholas; Joshi, Vidul; Dai, Wei; Shankar, Shyam; Devoret, Michel | We show that using a Superconducting Nonlinear Asymmetric Inductive eLement (SNAIL) as an active element, we are able to tune to a Kerr-free sweet spot in the presence of the pump, which exhibits significantly improved 1 dB compression power. | Session 51: Superconducting Circuits: Josephson Amplifiers and Non-reciprocal Devices |

753 | Towards a SQUID-based Traveling Wave Parametric Amplifier | Planat, Luca; Bharadwaj, Karthik Srikanth; Buisson, Olivier; Dassonneville, Remy; Delaforce, Jovian; Foroughi, Farshad; Guichard, Wiebke; Leger, Sébastien; Milchakov, Vladimir; Naud, Cecile; Puertas, Javier; Roch, Nicolas | We will present our on-going effort to develop a SQUID-based TWPA. | Session 51: Superconducting Circuits: Josephson Amplifiers and Non-reciprocal Devices |

754 | Design and Fabrication of Broadband Parametric Amplifiers for Quantum Applications | Grebel, Joel; Bienfait, Audrey; Dumur, Etienne; Chang, Hung-Shen; Chou, Ming-Han; Conner, Christopher; Peairs, Gregory; Povey, Rhys; Satzinger, Kevin; Zhong, Youpeng; Cleland, Andrew | I will describe the circuit designs and fabrication process for JPAs developed at the University of Chicago, fabricated in a new nanofabrication facility. We will present data on lumped-element JPA devices with state-of-the-art gain, saturation power, and bandwidth [2], and describe different circuit designs for achieving large bandwidths [3]. | Session 51: Superconducting Circuits: Josephson Amplifiers and Non-reciprocal Devices |

755 | Design of an on-chip superconducting microwave circulator with octave bandwidth | Chapman, Benjamin; Rosenthal, Eric; Lehnert, Konrad | Here we present the design of a broadband, superconducting, on-chip circulator composed of dynamically modulated transfer switches and delays. | Session 51: Superconducting Circuits: Josephson Amplifiers and Non-reciprocal Devices |

756 | A Fast Tunable, Large Bandwidth Superconducting Microwave Switch | Chang, Hung-Shen; Satzinger, Kevin; Zhong, Youpeng; Bienfait, Audrey; Chou, Ming-Han; Conner, Christopher; Dumur, Etienne; Grebel, Joel; Peairs, Gregory; Povey, Rhys; Cleland, Andrew | Here, we present the design and characterization of a lossless single pole double throw (SPDT) superconducting switch based on tunable DC SQUIDs. | Session 51: Superconducting Circuits: Josephson Amplifiers and Non-reciprocal Devices |

757 | Low-loss ferrite waveguide circulator for non-reciprocal circuit QED | Wang, Yingying; Connolly, Thomas; Wang, Chen | We will describe our ongoing progress towards a 3D circuit QED platform with non-reciprocal qubit-qubit interactions. | Session 51: Superconducting Circuits: Josephson Amplifiers and Non-reciprocal Devices |

758 | Broadband superconducting switches for integrated quantum networks | Rosenthal, Eric; Schneider, Christian; Chapman, Benjamin; Vale, Leila; Hilton, Gene; Lehnert, K. | To achieve these effects, we develop widely tunable SQUID arrays and present measurements of their performance. | Session 51: Superconducting Circuits: Josephson Amplifiers and Non-reciprocal Devices |

759 | Josephson Junction-Based Components for Scalable Quantum Computing | Richman, Brittany; Raj, Cosmic; Taylor, Jacob | With this motivation, we examine how arrays of Josephson junctions in external magnetic fields provide the potential to replace larger devices using the ordering of flux degrees of freedom in the arrays. | Session 51: Superconducting Circuits: Josephson Amplifiers and Non-reciprocal Devices |

760 | Efficient qubit measurements with a nonreciprocal microwave amplifier | Lecocq, Florent; Ranzani, Leonardo; Peterson, Gabriel; Cicak, Katarina; Jin, X. Y.; Simmonds, Raymond; Teufel, John; Aumentado, Jose | In this talk we will discuss the measurement of a 3D transmon qubit with a Field-Programmable Josephson Amplifier (FPJA, [1]). | Session 51: Superconducting Circuits: Josephson Amplifiers and Non-reciprocal Devices |

761 | Anomalous Supercurrents in exciton-condensate/normal-barrier/exciton-condensate (EC/N/EC) junctions | Su, Jung-Jung; Hsu, Ya-Fen | We find that the supercurrent occurs because of a distinctive mechanism – an Andreev reflection occurs in one of the EC/N interfaces along with the interlayer tunneling in the barrier. | Session 51: Superconducting Circuits: Josephson Amplifiers and Non-reciprocal Devices |

762 | Scaling up package I/O for superconducting qubits | Weber, Steven; Rosenberg, Danna; Miloshi, Jovi; Cummings, John; Krieger, James; Alterman, Sam; Conway, David; Das, Rabindra; Hirjibehedin, Cyrus; Kim, David; Kowalski, Elizabeth; Lienhard, Benjamin; Melville, Alexander; Niedzielski, Bethany; Rokosz, John; Woods, Wayne; Yoder, Jonilyn; Kerman, Andrew; Oliver, William | We present strategies for achieving high-density wiring while avoiding package modes and reducing crosstalk. | Session 52: Superconducting Circuits: New Qubit Components and Packaging |

763 | Simulation and Analysis of Packaging of Superconducting Qubits | Lienhard, Benjamin; Woods, Wayne; Rosenberg, Danna; O’Brien, Kevin; Calusine, Greg; Weber, Steven; Orlando, Terry; Gustavsson, Simon; Oliver, William | In this work, we present results from simulation and analysis of the materials and geometric effects related to qubit packaging and its impact on qubit lifetimes. | Session 52: Superconducting Circuits: New Qubit Components and Packaging |

764 | Engineering the environment of superconducting quantum processors with multilayer PCBs | Peng, Kaidong; O’Brien, Kevin | We propose and present initial experiments on a crosstalk mitigation scheme using commercial multilayer printed circuit boards (PCBs) to enable rapid turnaround and widespread adoption. | Session 52: Superconducting Circuits: New Qubit Components and Packaging |

765 | Qubit Dynamics in a Multi-mode Environment with a Superconducting Metamaterial Resonator | Indrajeet, Sagar; Wang, Haozhi; Hutchings, Matthew; LaHaye, Matthew; Taketani, Bruno; Wilhelm, Frank; Plourde, Britton | We measure the coupling strength of the qubit to several modes by tuning the flux bias and compare the resulting vacuum Rabi splittings with numerical and analytical models. | Session 52: Superconducting Circuits: New Qubit Components and Packaging |

766 | Kerr- and cross-Kerr-free Josephson four-wave mixing device | Mundhada, Shantanu; Frattini, Nicholas; Puri, Shruti; Koottandavida, Akshay; Shankar, Shyam; Girvin, Steven; Devoret, Michel | We present the design and experimental characterization of such a device. | Session 52: Superconducting Circuits: New Qubit Components and Packaging |

767 | Quickly tunable refrigerator for superconducting qubits | Goetz, Jan; Gunyho, Andras; Silveri, Matti; Hsu, Hao; Catelani, Gianluigi; Möttönen, Mikko | We find that for typical parameters, the refrigerator is suitable for quickly cooling both transmon and flux qubits close to their ground states. | Session 52: Superconducting Circuits: New Qubit Components and Packaging |

768 | Quickly Tunable Electromagnetic Environment for Superconducting Quantum Circuits | Sevriuk, Vasilii; Tan, Kuan; Silveri, Matti; Masuda, Shumpei; Goetz, Jan; Partanen, Matti; Hazra, Dibyendu; Govenius, Joonas; Lake, Russell; Vesterinen, Visa; Grönberg, Leif; Hassel, Juha; Simbierowicz, Slawomir; Gunyho, Marton; Keränen, Aarne; Tuorila, Jani; Ala-Nissila, Tapio; Grabert, Hermann; Möttönen, Mikko | We recently introduced a device referred to as a quantum-circuit refrigerator (QCR) [1]. | Session 52: Superconducting Circuits: New Qubit Components and Packaging |

769 | Optimal Impedance Taper in the Presence of Nonlinear Voltage Reflections | Erickson, Robert; Bal, Mustafa; Pappas, David | Here we extend our earlier theory, allowing for arbitrarily sized impedance mismatches and large voltage reflections, reporting results for a lossless taper. | Session 52: Superconducting Circuits: New Qubit Components and Packaging |

770 | Verifying the radiative cooling of a superconducting resonator with a qubit spectrum analyzer | Wang, Zhixin; Xu, Mingrui; Han, Xu; Fu, Wei; Tang, Hong; Shankar, Shyam; Devoret, Michel | In this talk, we will introduce an experiment in which a 10 GHz superconducting resonator anchored to the 1 K stage of a dilution refrigerator is overcoupled to a 20 mK environment anchored to the mixing chamber stage of the refrigerator. | Session 52: Superconducting Circuits: New Qubit Components and Packaging |

771 | Fast flux control of 3D transmon qubits using a magnetic hose | Oleschko, Stefan; Gargiulo, Oscar; Prat-Camps, Jordi; Zanner, Maximilian; Kirchmair, Gerhard | Here we introduce a new approach for fast flux control on 3D transmon qubits. | Session 52: Superconducting Circuits: New Qubit Components and Packaging |

772 | Kinetic Inductance Microwave Resonators for Quantum Simulation of Nonequilibrium Bose-Hubbard Models | Fitzpatrick, Mattias; Kollar, Alicia; Houck, Andrew | Here we will discuss the use of kinetic inductance nonlinearities in microwave resonators as a new tool for quantum and classical-nonlinear simulation of Bose-Hubbard models. | Session 52: Superconducting Circuits: New Qubit Components and Packaging |

773 | Josephson Junctions with Two-Dimensional van der Waals Tunnel Barrier | Lee, Kan-Heng; Chakram, Srivatsan; Mujid, Fauzia; Park, Chibeom; Gao, Hui; Schuster, David; Park, Jiwoong | Here, we report novel Josephson Junctions with 2D van der Waals tunnel barriers made with stacked N-layer MoS 2 that has minimal number of defects. | Session 52: Superconducting Circuits: New Qubit Components and Packaging |

774 | Observation of a broadband Lamb shift in a superconducting resonator | Silveri, Matti; Masuda, Shumpei; Sevriuk, Vasilii; Tan, Kuan; Hyyppä, Eric; Partanen, Matti; Goetz, Jan; Lake, Russell; Grönberg, Leif; Möttönen, Mikko | Here, we experimentally observe in high-quality superconducting resonators a Lamb shift of several megahertz, by externally tuning the coupling strength of an engineered broadband environment based on hybrid normal-metal–superconductor tunnel junctions. | Session 52: Superconducting Circuits: New Qubit Components and Packaging |

775 | Quantum Dynamics of a few-photon Microwave Parametric Oscillator | Wang, Zhaoyou; Pechal, Marek; Safavi-Naeini, Amir | We observe narrowing of the linewidth when approaching the parametric stability threshold as well as non-classical signatures in the resonator state’s free evolution caused by the Kerr non-linearity. | Session 52: Superconducting Circuits: New Qubit Components and Packaging |

776 | Packaging Large-scale Superconducting Quantum Computer with Airbridge | Mukai, Hiroto; Sakata, Keiichi; Simon, Devitt; Wang, Rui; Nakajima, Yukito; Tsai, Jaw-Shen | In this talk, we present the novel arrangement of the array of qubits without non-monolithic special technology of three-dimensional wiring. | Session 52: Superconducting Circuits: New Qubit Components and Packaging |

777 | Weakly Tunable Qubit: Part I | Abdo, Baleegh; Chavez-Garcia, José; Hertzberg, Jared; Solgun, Firat; Jinka, Oblesh; Magesan, Easwar; Brink, Markus; Gambetta, Jay; Chow, Jerry | In this talk, we will introduce the qubit circuit and theory. | Session 53: Superconducting Circuits: New Qubit Technologies and Design |

778 | Weakly Tunable Qubit: Part II | Chavez, Jose; Abdo, Baleegh; Hertzberg, Jared; Solgun, Firat; Jinka, Oblesh; Magesan, Easwar; Brink, Markus; Gambetta, Jay; Chow, Jerry | In this talk, we will present some preliminary measurement results of these weakly tunable qubits. | Session 53: Superconducting Circuits: New Qubit Technologies and Design |

779 | Phase slips in voltage-biased superconducting rings: a qubit proposal? | Kenawy, Ahmed; Magnus, Wim; Soree, Bart | Here, we theoretically propose a junctionless flux qubit consisting of a voltage-biased superconducting ring. | Session 53: Superconducting Circuits: New Qubit Technologies and Design |

780 | The Null Flux Qubit | Olsen, Raina; Rezaee, Mohammadreza | We discuss a superconducting flux qubit whose sensitivity to low frequency flux is reduced through a null flux geometry consisting of one closed wire loop twisted into a `figure eight’ shape composed of two open loops, each with opposite circulation. | Session 53: Superconducting Circuits: New Qubit Technologies and Design |

781 | Symmetry Protected Qubits Through Fluxon Pairing | Hsieh, Wen Ting; Bell, Matthew; Lu, Wen-Sen; Zhang, Wenyuan; Kamenov, Plamen; Kalashnikov, Konstantin; Gershenson, Michael | We present time-domain experiments with symmetry-protected qubits whose quantum states are encoded in the parity of fluxons in a superconducting loop. | Session 53: Superconducting Circuits: New Qubit Technologies and Design |

782 | Breaking the trade-off between gate and relaxation times of a superconducting qubit with a Josephson quantum filter: Theory | Koshino, Kazuki; Kono, Shingo; Tabuchi, Yutaka; Noguchi, Atsushi; Lachance-Quirion, Dany; Nakamura, Yasunobu | We theoretically investigate a setup in which a qubit (data qubit) to be controlled is coupled to an end of a semi-infinite control line and a JQF is placed at a distance of the order of the resonance wavelength of the qubit. | Session 53: Superconducting Circuits: New Qubit Technologies and Design |

783 | Breaking the trade-off between gate and relaxation times of a superconducting qubit with a Josephson quantum filter: Experiment | Kono, Shingo; Koshino, Kazuki; Tabuchi, Yutaka; Noguchi, Atsushi; Lachance-Quirion, Dany; Nakamura, Yasunobu | In this talk, we will present the circuit design and demonstrate the effect of JQF on the qubit coherence. | Session 53: Superconducting Circuits: New Qubit Technologies and Design |

784 | Theoretical analysis on the composite qubit approach to superconducting quantum computing | Shim, Yun-Pil; Campbell, Daniel; Kannan, Bharath; Winik, Roni; Kim, David; Melville, Alexander; Niedzielski, Bethany; Yoder, Jonilyn; Orlando, Terry; Gustavsson, Simon; Oliver, William; Tahan, Charles | We present theoretical analysis of the optimal operating point (sweet spot) and the gate operations in a real device in the presence of various sources of noise and errors. | Session 53: Superconducting Circuits: New Qubit Technologies and Design |

785 | Hamltonian Quantum Computing with transmon qubits | Ciani, Alessandro; Terhal, Barbara; DiVincenzo, David | We propose the implementation the strong of the cross-Kerr interactions with a newly designed direct coupler based on array of few Josephson junctions, which should allow to reach larger cross-Kerr coupling compared to other proposals, without causing any increase in the problem of cross-talk. | Session 53: Superconducting Circuits: New Qubit Technologies and Design |

786 | Low-Loss Dielectric Materials and the Merged Element Transmon | McRae, Corey Rae; McFadden, Anthony; Bal, Mustafa; Wu, Xian; Long, Junling; Ku, Hsiang-Sheng; Wen, Jianguo; Wang, Jie; Arslan, Ilke; Palmstrom, Chris; Pappas, David; Lake, Russell | In this work, we characterize dielectric thin films within lumped-element resonators to determine microwave losses in the single-photon regime and to identify dielectric barrier materials for a merged element transmon. | Session 53: Superconducting Circuits: New Qubit Technologies and Design |

787 | Capacitively Shunted Flux Qubit with High Anharmonicity and Long Coherence Times | Shi, Jiahao; Yurtalan, Muhammet Ali; Flatt, Graydon; Lupascu, Adrian | We present experiments on a three Josephson junction flux qubit with all junctions shunted by large capacitive pads. | Session 53: Superconducting Circuits: New Qubit Technologies and Design |

788 | Engineering Sideband Interactions with the Very Small Logical Qubit (VSLQ) Device Part I | Roberts, Gabrielle; Lu, Yao; Leung, Nelson; Chakram, Srivatsan; Kapit, Eliot; Schuster, David | I will describe a simple circuit and protocol that autonomously implements the error correction process [1]. | Session 53: Superconducting Circuits: New Qubit Technologies and Design |

789 | Engineering Sideband Interactions with the Very Small Logical Qubit (VSLQ) Device Part II | Lu, Yao; Roberts, Gabrielle; Leung, Nelson; Chakram, Srivatsan; Kapit, Eliot; Schuster, David | As a first step, we modify the original VSLQ superconducting circuit [1] and propose a new parametric modulation scheme for engineering the VSLQ Hamiltonian. | Session 53: Superconducting Circuits: New Qubit Technologies and Design |

790 | Efficient characterization of correlated SPAM errors | Sun, Mingyu; Geller, Michael | Here we introduce an approximate but efficient method for SPAM error characterization requiring 2n(n ? 1) measurements. | Session 53: Superconducting Circuits: New Qubit Technologies and Design |

791 | Emergence of quasi-charge in an ultra-high-impedance superconducting circuit: Design | Mencia, Ray; Pechenezhskiy, Ivan; Nguyen, Long; Manucharyan, Vladimir | We introduce an ultra-high-impedance superconducting circuit where the role of phase difference across a Josephson junction is replaced by quasi-charge. | Session 53: Superconducting Circuits: New Qubit Technologies and Design |

792 | Emergence of quasi-charge in an ultra-high-impedance superconducting circuit: Experiment | Pechenezhskiy, Ivan; Mencia, Ray; Nguyen, Long; Manucharyan, Vladimir | We introduce an ultra-high-impedance superconducting circuit where the role of phase difference across a Josephson junction is replaced by quasi-charge. | Session 53: Superconducting Circuits: New Qubit Technologies and Design |

793 | Building Hamiltonians with Josephson Phase-Slip Qubits | Clarke, David; Ferguson, David; Epstein, Ryan | As an example of the possibilities inherent in these devices, we present a system of JPSQs that adiabatically encodes or decodes a logical qubit in a [[4,1,2]] Bacon-Shor code. | Session 53: Superconducting Circuits: New Qubit Technologies and Design |

794 | Characterization of Josephson phase-slip qubits, part 1: device fundamentals | Hirjibehedin, Cyrus; Weber, Steven; Samach, Gabriel; Kim, David; Melville, Alexander; Niedzielski, Bethany; Rosenberg, Danna; Yoder, Jonilyn; Oliver, William; Kerman, Andrew | We describe the design and operation of a JPSQ implementation. | Session 53: Superconducting Circuits: New Qubit Technologies and Design |

795 | Characterization of Josephson phase-slip qubits, Part 2: Annealing | Hinkey, Robert; Khalil, Moe; Novikov, Sergey; Clarke, David; Basham, James; Disseler, Steven; Marakov, Alexander; Grover, Jeffrey; Kim, David; Stegen, Zachary; Melville, Alexander; Niedzielski, Bethany; Yoder, Jonilyn; Lidar, Daniel; Zick, Kenneth; Ferguson, David | In this talk we present initial characterization measurements of JPSQs that are annealing-compatible and have a large charge dispersion. | Session 53: Superconducting Circuits: New Qubit Technologies and Design |

796 | Classically reversible logic gate coupled to a superconducting qubit: Problem definition (pt. 1) | Osborn, Kevin; Wustmann, Waltraut | We analyze the gates with a quasiparticle model for the LJJ fields. | Session 53: Superconducting Circuits: New Qubit Technologies and Design |

797 | Classically reversible logic gate coupled to a superconducting qubit: Qubit simulation (pt. 2) | Wustmann, Waltraut; Osborn, Kevin | We theoretically study a classically reversible logic gate coupled to a superconducting qubit for potential applications in quantum computing. | Session 53: Superconducting Circuits: New Qubit Technologies and Design |

798 | Quantum information processing using 3D multimode circuit QED | Chakram, Srivatsan; Naik, Ravi; Dixit, Akash; Lu, Yao; Anferov, Alexander; Leung, Nelson; Oriani, Andrew; Schuster, David | To eliminate coherent errors arising from multimode state dependent Stark shifts of the transmon, we introduce an intermediate single-mode ‘manipulate’ cavity with a tunable coupling to the multimode cavity. | Session 53: Superconducting Circuits: New Qubit Technologies and Design |

799 | Towards Developing a Graphene Josepheson junction based qubit device | McElroy, Kyle; Thompson, Jesse; Blue, Brandon; Spietz, Lafe; Epstein, Jacob; Ishigami, Masa; Hoffmann, Joan | We will discuss the preliminary development of a transmon with a graphene based Josepheson junction. | Session 53: Superconducting Circuits: New Qubit Technologies and Design |

800 | Quantum coherent control of graphene-based transmon qubit | Wang, Joel; Rodan Legrain, Daniel; Boettcher, Charlotte; Bretheau, Landry; Campbell, Daniel; Kannan, Bharath; Kim, David; Kjærgaard, Morten; Krantz, Philip; Samach, Gabriel; Yan, Fei; Yoder, Jonilyn; Watanabe, Kenji; Taniguchi, Takashi; Orlando, Terry; Gustavsson, Simon; Jarillo-Herrero, Pablo; Oliver, William | We show that this device can be operated as a voltage-tunable transmon qubit, whose spectrum reflects the electronic properties of massless Dirac fermions traveling ballistically. | Session 53: Superconducting Circuits: New Qubit Technologies and Design |

801 | Resonator Cavities Compatible with Epitaxial InAs-Al Heterostructures | Yuan, Joseph; Dartiailh, Matthieu; Mayer, William; Song, Eric; Wickramasinghe, Kaushini; Shabani, Javad | We present resonator quality factors for a fixed design on various levels of the buffer layers used as substrates. | Session 53: Superconducting Circuits: New Qubit Technologies and Design |

802 | Superconducting gatemon qubits based on selective-area-grown semiconductor materials | Hertel, Albert; Andersen, Laurits; Pearson, Natalie; Connolly, Malcolm; Zannier, Valentina; Sorba, Lucia; Yu, Liu; Krogstrup, Peter; Gardner, Geoffrey; Manfra, Michael; Petersson, Karl; Marcus, Charles | Here, we present a novel approach to building gatemons utilizing selective-area-grown InAs structures on an InP substrate [3,4]. | Session 53: Superconducting Circuits: New Qubit Technologies and Design |

803 | Control of topological properties in the Kitaev chain by quantum microwave radiation | Méndez-Córdoba, Fabio; Gómez-Ruiz, Fernando; Mendoza-Arenas, Juan; Rodriguez, Ferney; Tejedor, Carlos; Quiroga, Luis | We study and describe the quantum phases of the system, and the transitions between them, for two different composite fermion-photon model, namely a cavity homogeneously coupled to the whole chain as well as the case of a microwave selectively coupled to an edge site of the chain only. | Session 53: Superconducting Circuits: New Qubit Technologies and Design |

804 | Ultra low-loss single-crystalline material platform for high-Q quantum devices | Rodionov, Ilya; Baburin, Aleksandr; Ryzhikov, Ilya; Gabidullin, Aidar; Moskalev, Dmitriy; Dobronosova, Alina; Matanin, Alexey | Here we present a new approach for high vacuum deposition of single-crystalline metallic films with extremely low losses, which we name the SCULL (Single-crystalline Continuous Ultra-smooth Low-loss Low-cost) process. | Session 53: Superconducting Circuits: New Qubit Technologies and Design |

805 | Probing remote entanglement in a localized system with a superconducting qubit quantum simulator. | Chiaro, Ben; Foxen, Brooks; McEwen, Matthew; Martinis, John | We use the device to generate high-fidelity, multi-qubit, analog dynamics evolving under a Bose-Hubbard Hamiltonian. | Session 54: Superconducting Circuits: Quantum Simulations and Many-Body Physics |

806 | A dissipatively stabilized Mott-insulator of photons | Saxberg, Brendan; Ma, Ruichao; Owens, Clai; Simon, Jonathan; Schuster, David | 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 interaction. | Session 54: Superconducting Circuits: Quantum Simulations and Many-Body Physics |

807 | A transmon based five-qutrit processor for simulations in high energy physics | Blok, Machiel; Ramasesh, Vinay; Dahlen, Dar; O’Brien, Kevin; Kreikebaum, John Mark; Yao, Norman; Siddiqi, Irfan | Here we report on the control of a five-qutrit processor and our progress toward characterizing the scrambling of quantum information. | Session 54: Superconducting Circuits: Quantum Simulations and Many-Body Physics |

808 | Band Engineering for Quantum Simulation in Circuit QED | Kollar, Alicia; Fitzpatrick, Mattias; Sarnak, Peter; Houck, Andrew | In this talk, we will show how graph-theory and graph-level operations can be used to tailor the single-particle band structures of such systems. | Session 54: Superconducting Circuits: Quantum Simulations and Many-Body Physics |

809 | Tunable-profile qubit-photon bound state interactions with superconducting circuits | Smitham, Basil; Sundaresan, Neereja; Bienias, Przemyslaw; Lundgren, Rex; Gorshkov, Alexey; Houck, Andrew | By driving the photonic crystal with multiple tones we aim to engineer non-exponential effective interactions, with the goal of accessing a broader class of tunable spin models. | Session 54: Superconducting Circuits: Quantum Simulations and Many-Body Physics |

810 | Emulating Majorana Fermions Using Transmon Qubits with Application to Topological Quantum Computing | Najafi-Yazdi, Alireza | In this talk, we propose a different approach: instead of trying to realize Majorana modes in solid-state systems such as Superconducting/Semiconducting naowires, we propose to engineer an array of transmon qubits to realize a meta material with Majorana modes. | Session 54: Superconducting Circuits: Quantum Simulations and Many-Body Physics |

811 | High coherence quantum simulation of coherent backscattering in an effective two-level system composed of two superconducting qubits | Gramajo, Ana; Campbell, Dan; Kannan, Bharath; Kim, David; Melville, Alexander; Niedzielski, Bethany; Yoder, Jonilyn; Domínguez, Daniel; Sánchez, María; Gustavsson, Simon; Oliver, William | High coherence quantum simulation of coherent backscattering in an effective two-level system composed of two superconducting qubits | Session 54: Superconducting Circuits: Quantum Simulations and Many-Body Physics |

812 | Demonstration of a non-stoquastic Hamiltonian in coupled superconducting flux qubits | Ozfidan, Isil; Deng, Chunqing; Amin, Mohammad; Smirnov, Anatoly; Lanting, Trevor | Here we present one- and two-qubit microwave spectroscopy as well as time evolution measurements on two superconducting flux qubits coupled via two orthogonal degrees of freedom, charge and flux. | Session 54: Superconducting Circuits: Quantum Simulations and Many-Body Physics |

813 | Metamaterial Slow-Light Waveguide for Finite Range Interactions and Non-Markovian Dynamics with Superconducting Qubits | Ferreira, Vinicius; Banker, Jash; Mirhosseini, Mohammad; Sipahigil, Alp; Painter, Oskar | Here, we present the experimental realization of an on-chip superconducting metamaterial waveguide composed of an array of coupled resonators of subwavelength size and negligible frequency disorder. | Session 54: Superconducting Circuits: Quantum Simulations and Many-Body Physics |

814 | Roadmap to a superconducting quantum many body simulator | Yanay, Yariv; Campbell, Daniel; Braumüller, Jochen; Oliver, William; Tahan, Charles | Here, we propose how a larger two-dimensionsal system can be realized with far fewer control lines by focusing on qubit designs that can be uniformly fabricated, with deviation from the design frequency acting as disorder. | Session 54: Superconducting Circuits: Quantum Simulations and Many-Body Physics |

815 | Synthetic quantum materials in superconducting circuits | Ma, Ruichao; Saxberg, Brendan; Owens, Clai; Simon, Jonathan; Schuster, David | The dissipative preparation demonstrated in this work also enable future exploration of elusive interacting topological phases. | Session 54: Superconducting Circuits: Quantum Simulations and Many-Body Physics |

816 | Time-Resolved Measurements of Energy Transport in a System of Coupled Superconducting Qubits Inspired by Simulations of Photosynthetic Processes | Norris, Graham; Poto?nik, Anton; Collodo, Michele; Akin, Abdulkadir; Gasparinetti, Simone; Eichler, Christopher; Wallraff, Andreas | To study the transport of single photons, we now switch to pulsed excitations and time-resolved measurements. | Session 54: Superconducting Circuits: Quantum Simulations and Many-Body Physics |

817 | Quantum impurity in a 1D photonic crystal | Vrajitoarea, Andrei; Lundgren, Rex; Wang, Yidan; Bienias, Przemyslaw; Gorshkov, Alexey; Houck, Andrew | In this talk we present recent efforts in further pushing the coupling strength with the stepped impedance microwave crystal, using an artificial atom with a large magnetic moment, the fluxonium circuit. | Session 54: Superconducting Circuits: Quantum Simulations and Many-Body Physics |

818 | Quantum impurity physics simulation with superconducting circuits I: perturbative regime | Mehta, Nitish Jitendrakumar; Kuzmin, Roman; Grabon, Nicholas; Mencia, Ray; Manucharyan, Vladimir | We will present the measurements at various line impedances and impurity parameters. | Session 54: Superconducting Circuits: Quantum Simulations and Many-Body Physics |

819 | Quantum impurity physics simulation with superconducting circuits II: many-body regime | Kuzmin, Roman; Mehta, Nitish Jitendrakumar; Grabon, Nicholas; Mencia, Ray; Manucharyan, Vladimir | We will present the measurements at various line impedances and impurity parameters. | Session 54: Superconducting Circuits: Quantum Simulations and Many-Body Physics |

820 | Measurement of GHZ and cluster state entanglement monotones in transmon qubits | Katabarwa, Amara; Geller, Michael | We measure the decay of the monotones with time, and find in the GHZ case that they actually oscillate, which we interpret as a drift in the relative phase between the all zero and all one components, but not an oscillation in the actual entanglement. | Session 55: Superconducting Circuits: Qubit Control and Entanglement |

821 | Scalable generation of genuine multiparticle entanglement with superconducting qubits | Gong, Ming; Chen, Ming-Cheng; Zheng, Yarui; Wang, Shiyu; Zha, Chen; Deng, Hui; Yan, Zhiguang; Rong, Hao; Wu, Yulin; Li, Shaowei; Chen, Fusheng; Zhao, Youwei; Liang, Futian; Lin, Jin; Xu, Yu; Guo, Cheng; Sun, Lihua; Castellano, Anthony; Wang, Haohua; Peng, Chengzhi; Lu, Chao-Yang; Zhu, Xiaobo; Pan, Jian-Wei | In this work, based only on single-qubit gates and controlled-phase gates, we generated and verified the genuine multiparticle entanglement for more than 10 superconducting qubits. | Session 55: Superconducting Circuits: Qubit Control and Entanglement |

822 | Simple preparation of Bell and GHZ states using ultrastrong-coupling circuit QED | Frisk Kockum, Anton; Macrì, Vincenzo; Nori, Franco | Here, we propose a new, simple, and versatile setup for deterministically creating Bell and Greenberger-Horne-Zeilinger (GHZ) states between photons of different frequencies in a two-step protocol. | Session 55: Superconducting Circuits: Qubit Control and Entanglement |

823 | Proposal to Generate and Characterize Quantum Entanglement using Coupled Metamaterial Resonators | Rouxinol, Francisco; Brito, Frederico; LaHaye, Matthew; Plourde, B.L.T. | Using a left-handed metamaterial coupled to a nanomechanical resonator, we propose a new procedure to couple multiple microwave resonant modes and investigate entanglement in these limits. | Session 55: Superconducting Circuits: Qubit Control and Entanglement |

824 | Propagating Non-Gaussian States Generated by Degenerate 3-photon Downconversion | Chang, Chung Wai Sandbo; Vadiraj, A.; Nsanzineza, Ibrahim; Wilson, Christopher | Here, with a superconducting parametric cavity designed for cubic interactions, we present experimental results for spontaneous three-photon downconversion when the cavity is flux pumped at three times the mode frequency. | Session 55: Superconducting Circuits: Qubit Control and Entanglement |

825 | Multipartite entanglement mediated by shared microwave resonators | Lu, Marie; Schreppler, Sydney; Buchmann, Lukas; Motzoi, Felix; Siddiqi, Irfan | We use shared coplanar waveguide (CPW) resonators to realize an analogous Mølmer-Sørensen gate between superconducting qubits. | Session 55: Superconducting Circuits: Qubit Control and Entanglement |

826 | Probing the Tavis-Cummings level splitting with intermediate-scale superconducting circuits | Weides, Martin; Yang, Ping; Brehm, Jan David; Leppaekangas, Juha; Guo, Lingzhen; Marthaler, Michael; Boventer, Isabella; Stehli, Alexander; Wolz, Tim; Ustinov, Alexey | We demonstrate the local control of up to eight two-level systems interacting strongly with a microwave cavity. | Session 55: Superconducting Circuits: Qubit Control and Entanglement |

827 | Improving the fidelity of entangling gates via in situ characterization of qubit control lines. | Kulikov, Anatoly; Jerger, Markus; Fedorov, Arkady | I will present the refinement of the method and its experimental application to improve the fidelity of CPHASE gate between two superconducting transmon qutrits. | Session 55: Superconducting Circuits: Qubit Control and Entanglement |

828 | Fast Amplification and Rephasing of Entangled Cat States in a Qubit-Oscillator System | Fuse, Tomoko; Xiao, Zhihao; Ashhab, Sahel; Yoshihara, Fumiki; Semba, Kouichi; Sasaki, Masahide; Takeoka, Masahiro; Dowling, Jonathan | In this work [1], we study a qubit-oscillator system described by the quantum Rabi model with a time-dependent coupling coefficient. | Session 55: Superconducting Circuits: Qubit Control and Entanglement |

829 | Ground-state cooling, Fock-state stabilization and photon-resolved thermalization dynamics in a hot 170 MHz resonator. | Gely, Mario; Kounalakis, Marios; Dickel, Christian; Dalle, Jacob; Vatré, Rémy; Jenkins, Mark; Steele, Gary | Despite millikelvin temperatures being a dominant energy scale in a 170 MHz circuit QED mode, we show that quantum control of the mode can still be realized. | Session 55: Superconducting Circuits: Qubit Control and Entanglement |

830 | Probing the influence of many-body fluctuations on Cooper pair tunneling using circuit QED | Léger, Sébastien; Puertas, Javier; Planat, Luca; Dassonneville, Remy; Milchakov, Vladimir; Bharadwaj, Karthik Srikanth; Delaforce, Jovian; Foroughi, Farshad; Buisson, Olivier; Naud, Cecile; Guichard, Wiebke; Snyman, Izak; Florens, Serge; Roch, Nicolas | In this work we investigate the interactions between the plasma modes propagating in arrays of more than 4000 SQUIDs (which simulate the light) and a small Josephson junction (the matter). | Session 55: Superconducting Circuits: Qubit Control and Entanglement |

831 | Driving not so forbidden state transitions in a frequency-tunable transmon | Opremcak, Alexander; Chiaro, Ben; Foxen, Brooks; McEwen, Matthew; McDermott, Robert; Martinis, John | From a theoretical analysis of the dc SQUID, we derive a drive term that explains the violation. | Session 55: Superconducting Circuits: Qubit Control and Entanglement |

832 | Perfect quantum state transfer in a superconducting qubit chain with parametrically tunable couplings | Li, Xuegang | Here, we demonstrate a fast (in 84 ns) and high-fidelity (99.2%) transfer of arbitrary quantum states in a chain of four superconducting qubits with nearest-neighbor coupling. | Session 55: Superconducting Circuits: Qubit Control and Entanglement |

833 | Temperature Dependence of Fidelity for Parametrically Stimulated Gates | Mundada, Pranav; Zhang, Gengyan; Houck, Andrew | Here we present the importance of thermalization of the tunable coupler, to the base temperature of a dilution refrigerator, for achieving a high-fidelity parametric gate. | Session 55: Superconducting Circuits: Qubit Control and Entanglement |

834 | Quantum entanglement dynamics due to dynamical Lamb effect | Amico, Mirko; Berman, Oleg; Kezerashvili, Roman | We investigate the dynamics of a system of N qubits coupled to a common resonator with time-dependent coupling. | Session 55: Superconducting Circuits: Qubit Control and Entanglement |

835 | Particle production in ultrastrong-coupling waveguide QED | Gheeraert, Nicolas; Zhang, Xin; Sépulcre, Théo; Bera, Soumya; Roch, Nicolas; Baranger, Harold; Florens, Serge | Most remarkably, I will show that the qubit non-linearity, transferred to the waveguide through the ultra-strong light-matter interaction, is able to split photons from the incoming beam into several lower-energy photons. | Session 56: Superconducting Circuits: Remote Entanglement and Waveguide QED |

836 | Waveguide-mediated interaction of artificial atoms in the strong coupling regime, part 1 | Zhang, Xueyue; Kim, Eun Jong; Mirhosseini, Mohammad; Sipahigil, Alp; Dieterle, Paul; Keller, Andrew; Asenjo-Garcia, Ana; Chang, Darrick; Painter, Oskar | In this work, we utilize the sub-radiant state to trap the radiation, acting as an atomic cavity, and strongly couple a probe quantum emitter to the sub-radiant state, effectively creating an atom-cavity system [New J. Phys. | Session 56: Superconducting Circuits: Remote Entanglement and Waveguide QED |

837 | Waveguide-mediated interaction of artificial atoms in the strong coupling regime, part 2 | Kim, Eun Jong; Zhang, Xueyue; Mirhosseini, Mohammad; Sipahigil, Alp; Dieterle, Paul; Keller, Andrew; Asenjo-Garcia, Ana; Chang, Darrick; Painter, Oskar | Here, we employ transmon qubits and a microwave coplanar waveguide as artificial atoms coupled to a one-dimensional channel. | Session 56: Superconducting Circuits: Remote Entanglement and Waveguide QED |

838 | Waveguide QED with a giant transmon | Vadiraj, A.M.; Chang, C.W.S; Nsanzineza, Ibrahim; Wilson, Christopher | We will present preliminary characterization of such a device. | Session 56: Superconducting Circuits: Remote Entanglement and Waveguide QED |

839 | Studying collective effects in 3D waveguide QED with frequency and time-domain resolved spectroscopy | Sharafiev, Aleksei; Juan, Mathieu; Zanner, Maximilian; Garcia-Ripoll, Juan Jose; Kirchmair, Gerhard | We study the system dynamics in frequency, as well as time-domain and compare it to theoretical predictions. | Session 56: Superconducting Circuits: Remote Entanglement and Waveguide QED |

840 | Real-time detection of an itinerant microwave photon using dressed-state engineering | Lin, Zhirong; Masuda, Shumpei; Inomata, Kunihiro; Koshino, Kazuki; Yamamoto, Tsuyoshi; Nakamura, Yasunobu | In this presentation, we demonstrate a real-time detection of itinerant microwave photons. | Session 56: Superconducting Circuits: Remote Entanglement and Waveguide QED |

841 | Quantum non demolition parity measurements of itinerant microwave fields | Besse, Jean-Claude; Gasparinetti, Simone; Collodo, Michele; Remm, Ants; Eichler, Christopher; Wallraff, Andreas | We present results of this phase space tomography method for propagating fields for various classical and quantum input fields. | Session 56: Superconducting Circuits: Remote Entanglement and Waveguide QED |

842 | Violating Bell’s Inequality with Remotely-Connected Superconducting Qubits | Zhong, Youpeng; Chang, Hung-Shen; Satzinger, Kevin; Chou, Ming-Han; Bienfait, Audrey; Conner, Christopher; Dumur, Etienne; Grebel, Joel; Peairs, Gregory; Povey, Rhys; Schuster, David; Cleland, Andrew | Here we present a simple and robust architecture for achieving this benchmark result in a superconducting system. | Session 56: Superconducting Circuits: Remote Entanglement and Waveguide QED |

843 | Microwave remote state preparation vs. quantum cryptography | Deppe, Frank; Fedorov, Kirill; Pogorzalek, Stefan; Xu, Mingxing; Chen, Qu-Ming; Fischer, Michael; Renger, Michael; Xie, Edwar; Marx, Achim; Gross, Rudolf | In our experiment, we use flux-driven Josephson parametric amplifiers and linear circuit elements to generate propagating two-mode squeezed (TMS) microwave states acting as quantum resource [K. G. Fedorov et al., Phys. Rev. Lett. 117, 020502 (2016); K. G. Fedorov et al., Sci. Rep. 8, 6416 (2018)]. | Session 56: Superconducting Circuits: Remote Entanglement and Waveguide QED |

844 | Generating Non-Classical and Spatially-Correlated Photons in a Waveguide QED Architecture | Kannan, Bharath; Campbell, Daniel; Winik, Roni; Kim, David; Melville, Alexander; Niedzielski, Bethany; Yoder, Jonilyn; Orlando, Terry; Gustavsson, Simon; Oliver, William | In this work, we experimentally study devices with multiple superconducting transmon qubits that are strongly coupled to a one-dimensional co-planar waveguide. | Session 56: Superconducting Circuits: Remote Entanglement and Waveguide QED |

845 | Quantum Communication with Microwave Photons | Wallraff, Andreas | We implement a deterministic state transfer and entanglement protocol between individually packaged chips connected by coaxial lines [1]. | Session 56: Superconducting Circuits: Remote Entanglement and Waveguide QED |

846 | Raman Transitions between two Superconducting Cavity Modules via Parametric Conversion: Part I | Teoh, James; Burkhart, Luke; Axline, Christopher; Zhang, Yaxing; Frunzio, Luigi; Devoret, Michel; Girvin, Steven; Jiang, Liang; Schoelkopf, Robert | We investigate a simple quantum network capable of state transfer and entanglement between superconducting 3D cavities in two spatially separated modules. | Session 56: Superconducting Circuits: Remote Entanglement and Waveguide QED |

847 | Raman Transitions between two Superconducting Cavity Modules via Parametric Conversion: Part II | Burkhart, Luke; Teoh, James; Axline, Christopher; Zhang, Yaxing; Frunzio, Luigi; Devoret, Michel; Girvin, Steven; Jiang, Liang; Schoelkopf, Robert | Raman Transitions between two Superconducting Cavity Modules via Parametric Conversion: Part II | Session 56: Superconducting Circuits: Remote Entanglement and Waveguide QED |

848 | Generation of a microwave time-bin qubit with a superconducting qubit | Ilves, Jesper; Yamazaki, Shota; Kono, Shingo; Sunada, Yoshiki; Kim, Minkyu; Koshino, Kazuki; Nakamura, Yasunobu | To perform quantum state tomography on a prepared time-bin qubit state, we apply iterative maximum likelihood estimation on time-bin encoded single-photon signal squeezed in different quadratures. | Session 56: Superconducting Circuits: Remote Entanglement and Waveguide QED |

849 | Time-Bin Entanglement Between Remote Superconducting Cavities | Zalys-Geller, Evan; Campagne-Ibarcq, Phillipe; Narla, Anirudh; Shankar, Shyam; Axline, Christopher; Burkhart, Luke; Pfaff, Wolfgang; Frunzio, Luigi; Schoelkopf, Robert; Devoret, Michel | We present an experiment for time-bin entanglement between remote superconducting cavities. | Session 56: Superconducting Circuits: Remote Entanglement and Waveguide QED |

850 | Integration of classical electronics for quantum computing tasks in superconducting qubit systems | Corcoles, Antonio; Takita, Maika; Inoue, Ken; Lekuch, Scott; Kandala, Abhinav; Gambetta, Jay; Chow, Jerry | In this talk we will discuss some important details of this architecture for superconducting quantum processors, touching on current limitations and future outlook. | Session 57: Superconducting Qubits: Control Hardware and Methods |

851 | Evaluating the performance of classical electronics for quantum computing tasks in superconducting qubit systems | Takita, Maika; Corcoles, Antonio; Inoue, Ken; Lekuch, Scott; Kandala, Abhinav; Gambetta, Jay; Chow, Jerry | We present and discuss quantum protocols for near-term superconducting quantum processors for which quantum feedback or feedforward plays a key role. | Session 57: Superconducting Qubits: Control Hardware and Methods |

852 | Atomic flux pulses for a superconducting quantum processor, part 1: real-time corrections and repeatability of flux pulses | Malinowski, Filip; Rol, Michiel Adriaan; Ciorciaro, Livio; Tarasinski, Brian; Salathe, Yves; Haandbaek, Niels; Šedivý, Jan; DiCarlo, Leonardo | We present the calibration and characterization of atomic, repeatable flux pulses compatible with a flexible Quantum Instruction Set Architecture (QISA). | Session 57: Superconducting Qubits: Control Hardware and Methods |

853 | Atomic flux pulses for a superconducting quantum processor, part 2: performance and benefits of net-zero conditional-phase gates | Rol, Michiel Adriaan; Malinowski, Filip K; Battistel, Francesco; Tarasinski, Brian; Terhal, Barbara; DiCarlo, Leonardo | We use a novel pulse shape, named net-zero, to realize a coherence limited, codeword-triggered, and repeatable conditional-phase (CZ) gate between transmon qubits in a circuit QED processor. | Session 57: Superconducting Qubits: Control Hardware and Methods |

854 | Superconducting qubit control electronics – Part 1/2: system overview and control hardware | Vainsencher, Amit; Chiaro, Ben; Collins, Roberto; Foxen, Brooks; Jeffrey, Evan; Lucero, Erik; McEwen, Matthew; Sank, Daniel; Martinis, John | In this talk, we discuss the design, implementation, and challenges encountered in building our next generation modular control system. | Session 57: Superconducting Qubits: Control Hardware and Methods |

855 | Superconducting qubit control electronics – Part 2/2: dispersive measurement | Sank, Daniel; Collins, Roberto; Jeffrey, Evan; Lucero, Erik; Vainsencher, Amit; Foxen, Brooks; Chiaro, Ben; Martinis, John | We present preliminary results on our latest chips. | Session 57: Superconducting Qubits: Control Hardware and Methods |

856 | Superconducting Qubit Control with Single Flux Quantum Pulses in A Multichip Module: Part I – Fabrication and Pulse Driver | Liu, Chuan-Hong; Leonard, Edward; Beck, Matthew; Dodge, Kenneth; Ballard, Andrew; Howington, Caleb; Iaia, Vito; Nelson, JJ; Kirichenko, Alex; Yohannes, Daniel; Vernik, Igor; Walter, Jason; Chernyashevskyy, Oleksandr; Mukhanov, Oleg; Plourde, Britton; McDermott, Robert | Here we introduce a quantum-classical multichip module (MCM) where the SFQ driver and the qubit are segregated onto separate chips in order to suppress QP poisoning. | Session 57: Superconducting Qubits: Control Hardware and Methods |

857 | Superconducting Qubit Control with Single Flux Quantum Pulses in A Multichip Module: Part II Qubit and Quasiparticle Measurement | Dodge, Kenneth; Ballard, Andrew; Howington, Caleb; Iaia, Vito; Nelson, JJ; Liu, Chuan-Hong; Leonard, Edward; Beck, Matthew; Kirichenko, Alex; Yohannes, Daniel; Vernik, Igor; Walter, Jason; Chernyashevskyy, Oleksandr; Mukhanov, Oleg; McDermott, Robert; Plourde, B.L.T. | We demonstrate coupling of a Single Flux Quantum (SFQ) driver on a classical control chip to a superconducting qubit on a quantum chip in a multi-chip module package. | Session 57: Superconducting Qubits: Control Hardware and Methods |

858 | Reciprocal Quantum Logic Compatible SFQ-to-CMOS Amplifiers for High-Speed Data Transmission | Galan, Elias; McLain, Marie; Stoutimore, Micah; Miklich, Andrew; Pleim, Kurt; Paul, Ratz; McGuire, David; Oberg, Oliver; Keane, Zachary | We have developed an amplifier for use in transmitting high-speed reciprocal quantum logic signals to CMOS digital circuitry at room temperature. | Session 57: Superconducting Qubits: Control Hardware and Methods |

859 | Engineering cryogenic setups for 100-qubit scale superconducting circuit systems | Krinner, Sebastian; Storz, Simon; Kurpiers, Philipp; Magnard, Paul; Heinsoo, Johannes; Keller, Raphael; Luetolf, Janis; Eichler, Christopher; Wallraff, Andreas | In this talk, we present a cryogenic setup, which minimizes passive and active heat loads, while guaranteeing rapid qubit control and readout. | Session 57: Superconducting Qubits: Control Hardware and Methods |

860 | Scalable instrumentation for general purpose quantum computers | Jones, Glenn; Abrams, Deanna; Brown, Stephan; Capelluto, Lauren; Fried, Schuyler; Hong, Sabrina; Johnson, Blake; Lion, Rob; Mocarski, Adam; Pelstring, Mike; Rigetti, Chad; Russell, Damon; Rust, Michael; Ryan, Colm; Scarabelli, Diego; Sinclair, Rodney; Sivarajah, Prasahnt; Song, Chloe; Staley, Alexa; Stevenson, John; Suska, Mark; Taie-Nobarie, Nima; Tanguay, Celena; Tezak, Nikolas; Turkowski, Stefan | We present an FPGA-based system for controlling qubits that demonstrates a number of advantages over commercially available test equipment. | Session 57: Superconducting Qubits: Control Hardware and Methods |

861 | Scaling the input/output architecture of quantum processors to kQbit, and beyond, size in the NISQ era | Kuitenbrouwer, Daan; Bos, Wouter; Vermeulen, Kiefer; Lindeborg, Kelvin; Sorgedrager, Riemer; Thiney, Vivien; Kammhuber, Jakob; Bosman, Sal | Here we discuss an input/output (i/o) system for scalable quantum computers that uses a monolithic multi-layer flexible circuit from room temperature to ~10 miliKelvin to interface the quantum processor with its room temperature electronics. | Session 57: Superconducting Qubits: Control Hardware and Methods |

862 | Optimizing readout hardware for large scale quantum computers | White, Theodore; Chiaro, Ben; Foxen, Brooks; Martinis, John | In this talk we will compare several different varieties of amplifier from the perspective of device performance, fabrication difficulty, yield, and wiring complexity. | Session 57: Superconducting Qubits: Control Hardware and Methods |

863 | Scalable FPGA-based qubit control hardware | Huang, Gang; Xu, Yilun; Doolittle, Lawrence; Baek, Unpil; Siddiqi, Irfan | We introduce a novel FPGA-based architecture comprised of multiple qubit control boards, interconnected by a fiber-based synchronization system, to implement basic operations such as qubit control and readout. | Session 57: Superconducting Qubits: Control Hardware and Methods |

864 | An FPGA-based quantum feedback system for real-time qubit control | Baek, Unpil; Xu, Yilun; Huang, Gang; Doolittle, Lawrence; Siddiqi, Irfan | We present a new FPGA-based qubit control architecture that integrates the qubit readout, state recognition, and feedback response together to minimize latency. | Session 57: Superconducting Qubits: Control Hardware and Methods |

865 | Quantization of Large Superconducting Circuits with Tensor Networks | Colladay, Kristina; Weippert, Matthew; Ferguson, David; Epstein, Ryan | We introduce a novel method for efficient quantum simulation of large superconducting circuits using matrix product states (MPS) and the density matrix renormalization group (DMRG) technique. | Session 58: Superconducting Qubits: Hamiltonian Engineering and Design Tools |

866 | Towards Total Quantum System Characterization | Paz Silva, Gerardo; Cao, Ya; Guevara Prieto, Ivonne; Ferrie, Christopher | In this talk, we will present a limited-access total quantum system characterization tool. | Session 58: Superconducting Qubits: Hamiltonian Engineering and Design Tools |

867 | Exact quantization of superconducting circuits | Ansari, Mohammad | In order to do this, we obtain a unitary transformation that diagonalizes harmonic sector of the circuit. | Session 58: Superconducting Qubits: Hamiltonian Engineering and Design Tools |

868 | Numerical Methods for Current Mirror Qubit Simulations | Weiss, Daniel; Ferguson, David; Khalil, Moe; Li, Andy C. Y.; Koch, Jens | This talk discusses various numerical models for CMQs that address this challenge, and presents initial comparisons between these models and experimental realizations of these qubits. | Session 58: Superconducting Qubits: Hamiltonian Engineering and Design Tools |

869 | Quantum Engineering Design of Superconducting Qubits | Ferguson, David; Clarke, David; Weiss, Daniel; Koch, Jens | For this purpose, we introduce the Villain periodically Continued Harmonic Oscillator Basis (VCHOB). | Session 58: Superconducting Qubits: Hamiltonian Engineering and Design Tools |

870 | Energy-participation approach to the design of quantum Josephson circuits | Minev, Zlatko; Leghtas, Zaki; Mundhada, Shantanu; Pop, Ioan-Mihai; Christakis, Lysander; Devoret, Michel | In this talk, we present such an approach to unify the design of dissipation and Hamiltonians around a single concept — the energy participation, a number between zero and one — in a single-step electromagnetic simulation. | Session 58: Superconducting Qubits: Hamiltonian Engineering and Design Tools |

871 | Circuit Quantization in the Presence of Time-Dependent External Sources | You, Xinyuan; Sauls, James; Koch, Jens | In this talk, we present a generalized approach to circuit quantization valid in the presence of time-dependent external sources. | Session 58: Superconducting Qubits: Hamiltonian Engineering and Design Tools |

872 | Hamiltonian Learning on Superconducting Qubits using Bayesian Inference | Austin, Lillian; Casparis, Lucas; Granade, Christopher; Hertel, Albert; Pearson, Natalie; Petersson, Karl; Wiebe, Nathan | We demonstrate this by applying it to a superconductor semiconductor ‘gatemon’ qubit and use it to learn the parameters of the Hamiltonian. | Session 58: Superconducting Qubits: Hamiltonian Engineering and Design Tools |

873 | Establishing a physical model for a chain of superconducting qubits | Roushan, Pedram; Chiaro, Ben; Foxen, Brooks; Martinis, John | Using a few coupled superconducting qubits, we discuss a method for extracting the values of the physical parameters of the system. | Session 58: Superconducting Qubits: Hamiltonian Engineering and Design Tools |

874 | Drive-induced lifetime renormalization of superconducting qubits I: Effective Master Equations | Malekakhlagh, Mohammad Moein; Petrescu, Alexandru; Tureci, Hakan | We present our results in the form of effective master equations with renormalized Hamiltonian and collapse operators. | Session 58: Superconducting Qubits: Hamiltonian Engineering and Design Tools |

875 | Drive-induced lifetime renormalization of superconducting qubits II: The Readout Problem | Petrescu, Alexandru; Malekakhlagh, Mohammad Moein; Tureci, Hakan | We show that an effective master equation that accounts for renormalization of dissipative parameters due to number non-conserving terms inherent in the Josephson nonlinearity captures with good qualitative agreement this strong dependence. | Session 58: Superconducting Qubits: Hamiltonian Engineering and Design Tools |

876 | Computational modeling of decay and hybridization in superconducting circuits | Scheer, Michael; Block, Maxwell | We present a circuit theoretic technique for computing the complex frequencies and eigenmodes of superconducting circuits with radiative loss. | Session 58: Superconducting Qubits: Hamiltonian Engineering and Design Tools |

877 | Enablement of near-term quantum processors by architectural yield engineering | Rosenblatt, Sami; Hertzberg, Jared; Chavez-Garcia, José; Bronn, Nicholas; Paik, Hanhee; Sandberg, Martin; Magesan, Easwar; Smolin, John; Yau, Jeng-Bang; Adiga, Vivekananda; Brink, Markus; Chow, Jerry | In this talk, we will compare measured qubit frequencies to resistance measurements of Josephson junctions, and use a statistical model to suggest strategies for useful device yields at the 50 qubit and larger scale. | Session 58: Superconducting Qubits: Hamiltonian Engineering and Design Tools |

878 | Frequency trimming of superconducting fixed-frequency qubits | Bal, Mustafa; Long, Junling; Lake, Russell; Wu, Xian; McRae, Corey Rae; Ku, Hsiang-Sheng; Hertzberg, Jared; Bronn, Nicholas; Chow, Jerry; Pappas, David | We present fabrication process details, simulations, and qubit measurements. | Session 58: Superconducting Qubits: Hamiltonian Engineering and Design Tools |

879 | Local trimming of transmon qubit frequency by laser annealing of Josephson junctions | Muthusubramanian, Nandini; Bruno, Alessandro; Tarasinski, Brian; Fognini, Andreas; Hagen, Ronald; DiCarlo, Leonardo | We demonstrate a selective increase in junction resistance by localized thermal annealing using a focused diode laser source at room temperature. | Session 58: Superconducting Qubits: Hamiltonian Engineering and Design Tools |

880 | Measuring charge and flux noise correlations with a superconducting qubit | Christensen, Bradley; Wilen, Chris; Opremcak, Alexander; Nelson, JJ; Schlenker, Francisco; Faoro, Lara; Ioffe, Lev; Plourde, Britton; DuBois, Jonathan; McDermott, Robert | To this end, we have designed and fabricated a charge-sensitive transmon device. | Session 59: Superconducting Qubits: Noise and Decoherence |

881 | Piezoelectric loss in superconducting quantum circuits: Part 1 | Yoon, Taekwan; Chu, Yiwen; Kharel, Prashanta; Jain, Vijay; Renninger, William; Frunzio, Luigi; Rakich, Peter; Schoelkopf, Robert | In my talk, I will present a highly sensitive technique for measuring electromechanical coupling in a material at cryogenic temperatures and in the GHz regime. | Session 59: Superconducting Qubits: Noise and Decoherence |

882 | Piezoelectric loss in superconducting quantum circuits: Part II | Jain, Vijay; Chu, Yiwen; Yoon, Taekwan; Frunzio, Luigi; Schoelkopf, Robert | In this talk, we will present a technique for measuring the microwave loss due to the presence of known piezoelectric materials. | Session 59: Superconducting Qubits: Noise and Decoherence |

883 | Observation of Low Thermal Excited State Population of Transmon Qubit | Huang, Yizhou; Yeh, Jen-Hao; Zhang, Rui; Premaratne, Shavindra; Wellstood, Frederick; Palmer, Benjamin | With the refrigerator at 12 mK, we found that the residual excited state population of the qubit in the e state was 0.17% with uncertainty of 0.02%, corresponding to a remarkably small effective qubit temperature of just 28 mK. | Session 59: Superconducting Qubits: Noise and Decoherence |

884 | An analysis method for two superconducting resonators with common defects | Forouzani, Neda; Sarabi, Bahman; Noroozian, Omid; Wollack, Edward; Moseley, Samuel H; Osborn, Kevin | In this talk we analyze the device with a new 4 port, 2 resonator scattering theory. | Session 59: Superconducting Qubits: Noise and Decoherence |

885 | Investigating superconducting qubit loss channels in a quantum acoustical device | Moores, Bradley; Sletten, Lucas; Lehnert, K. | Here we investigate phonon radiation from Josephson junctions to put an upper bound on its limitations on the transmon’s coherence time. | Session 59: Superconducting Qubits: Noise and Decoherence |

886 | Charge-parity dynamics in offset-charge-sensitive transmons: Part 1 | Diamond, Spencer; Serniak, Kyle; Hays, Max; Fatemi, Valla; De Lange, Gijs; Shankar, Shyam; Frunzio, Luigi; Schoelkopf, Robert; Glazman, Leonid; Houzet, Manuel; Devoret, Michel | We utilize these devices to measure quasiparticle tunneling rates as a function of various experimental parameters such as RF filtering and qubit design. | Session 59: Superconducting Qubits: Noise and Decoherence |

887 | Charge-parity dynamics in offset-charge-sensitive transmons: Part 2 | Serniak, Kyle; Diamond, Spencer; Hays, Max; Fatemi, Valla; De Lange, Gijs; Shankar, Shyam; Frunzio, Luigi; Schoelkopf, Robert; Glazman, Leonid; Houzet, Manuel; Devoret, Michel | We utilize these devices to measure quasiparticle tunneling rates as a function of various experimental parameters such as RF filtering and qubit design. | Session 59: Superconducting Qubits: Noise and Decoherence |

888 | Non-equilibrium quasiparticles in superconducting circuits: photons vs. phonons | Catelani, Gianluigi; Basko, Denis | Focusing on the competition between heating via low-frequency photon absorption and cooling via photon and phonon emission, we obtain a remarkably simple non-thermal stationary solution of the kinetic equation for the quasiparticle distribution function. | Session 59: Superconducting Qubits: Noise and Decoherence |

889 | Superconducting quasiparticle traps for CPW resonators | Alexander, Ashish; Weddle, Christopher; Richardson, Christopher | Superconducting quasiparticle traps for CPW resonators | Session 59: Superconducting Qubits: Noise and Decoherence |

890 | Resolving the Location of Parasitic Defects in Superconducting Qubits | Bilmes, Alexander; Weiss, Georg; Barends, Rami; Kelly, Julian; Megrant, Anthony; Martinis, John; Ustinov, Alexey; Lisenfeld, Jürgen | New techniques to identify the location of decoherence-inducing material defects known as Two-Level-Tunneling systems (TLS) in superconducting qubits are demonstrated. | Session 59: Superconducting Qubits: Noise and Decoherence |

891 | Reducing dissipation for superconducting qubits | Alidoust, Nasser; Nersisyan, Ani; Poletto, Stefano; Manenti, Riccardo; Renzas, Russ; Sete, Eyob; Bui, Catvu; Vu, Kim; Whyland, Tyler; Mohan, Yuvraj; Stanwyck, Sam; Marshall, Jayss; Yadav, Kamal; Bestwick, Andrew; Reagor, Matthew | For these analyses, we have developed fabrication flows based on subtractively-patterned niobium that yield resonators with average internal quality factors of Q int ? 1×10 6 across several wafers and chips. | Session 59: Superconducting Qubits: Noise and Decoherence |

892 | Spurious mode suppression using micromachined pillars in superconducting quantum devices | Spring, Peter; Rahamim, Joseph; Vlastakis, Brian; Patterson, Andrew; Tsunoda, Takahiro; Sosnina, Sophia; Esposito, Martina; Jebari, Salha; Ratter, Kitti; Tancredi, Giovanna; Leek, Peter | Here we present an alternative that moves the through-chip electrical connection off the substrate and to the enclosure, which suppresses substrate and enclosure modes simultaneously. | Session 59: Superconducting Qubits: Noise and Decoherence |

893 | Phononic Losses in Superconducting Coplanar Waveguide Resonators on Piezoelectric Substrates | Scigliuzzo, Marco; Bruhat, Laure; Bengtsson, Andreas; Burnett, Jonathan; Delsing, Per | In this work we present an investigation of the phononic loss channel for CPW resonators fabricated on a piezoelectric substrate. | Session 59: Superconducting Qubits: Noise and Decoherence |

894 | Tunable High-Q Photonic Bandgap Microwave Cavity | Agrawal, Ankur; Dixit, Akash; Schuster, David; Chou, Aaron | We designed an electromagnetic cavity by creating a defect inside the crystal, such that its frequency lies within the forbidden bandgap. | Session 59: Superconducting Qubits: Noise and Decoherence |

895 | Correlating decoherence in transmon qubits: Low frequency noise by single fluctuators | Schlör, Steffen; Lisenfeld, Jürgen; Müller, Clemens; Schneider, Andre; Ustinov, Alexey; Weides, Martin | We present a simultaneous measurement of the qubit’s relaxation and dephasing rates as well as resonance frequency fluctuations, and analyze their correlations. | Session 59: Superconducting Qubits: Noise and Decoherence |

896 | Correlation of Lifetime Fluctuations in Superconducting Qubits | Rosenstock, Dario; Carey, Joshua; Wang, Chen | We monitor the T 1 fluctuations for the first two excited states of 3D flux-tunable transmon and fluxonium qubits and examine correlations between the decay rates. | Session 59: Superconducting Qubits: Noise and Decoherence |

897 | Cross-correlation noise measurements of a graphene-based SQUID magnetometer | Prance, Jonathan; Thompson, Michael; Haley, Richard; Pashkin, Yuri; Ben Shalom, Moshe; Falko, Vladimir; van der Vliet, Harriet; Matthews, Anthony; Melhem, Ziad | By cross-correlating the signals from two parallel amplifiers, we can detect signals down to ~100 pV/ ?Hz, well below the noise floor of each amplifier. | Session 59: Superconducting Qubits: Noise and Decoherence |

898 | How to reduce energy loss at the interface of superconducting devices | Diniz, Igor; de Sousa, Rogério | We present a quantum theory of dielectric energy loss due to the interaction of photons, tunneling two level systems (TTLSs), and phonons in superconducting devices. | Session 59: Superconducting Qubits: Noise and Decoherence |

899 | Magneto-Electric Coupling of Noise and Loss-Generating Paramagnetic Spins in Superconducting Circuits | Ray, Keith; DuBois, Jonathan; Lordi, Vincenzo | From this model we evaluate the effects of external electric and magnetic fields on the phases of the spin system, its dynamics, and the charge and flux noise generated. | Session 59: Superconducting Qubits: Noise and Decoherence |

900 | Non-Gaussian Noise Spectroscopy with a Superconducting Qubit | Sung, Youngkyu; Beaudoin, Felix; Norris, Leigh; Yan, Fei; Kim, David; Qiu, Jack; Von Luepke, Uwe; Yoder, Jonilyn; Orlando, Terry; Viola, Lorenza; Gustavsson, Simon; Oliver, William | Here, we experimentally validate an open-loop quantum control protocol that reconstructs the higher-order spectrum of injected non-Gaussian phase noise using a superconducting qubit as a noise spectrometer. | Session 59: Superconducting Qubits: Noise and Decoherence |

901 | Sources of decoherence in fixed frequency transmon qubits. | Fuhrer, Andreas; Mergenthaler, Matthias; Mueller, Peter; Paredes, Stephan; Müller, Clemens; Ganzhorn, Marc; Filipp, Stefan; Stoeferle, Thilo; Salis, Gian | We report on our efforts to measure and understand the noise sources that effect high coherence fixed frequency transmon qubits in a bottom loading dilution refrigerator. | Session 59: Superconducting Qubits: Noise and Decoherence |

902 | TLS induced decoherence instabilities in superconducting qubits | Bengtsson, Andreas; Burnett, Jonathan; Scigliuzzo, Marco; Niepce, David; Kudra, Marina; Delsing, Per; Bylander, Jonas | We study the temporal stability of relaxation and dephasing in superconducting transmon qubits. | Session 59: Superconducting Qubits: Noise and Decoherence |

903 | Charge noise, fluxonium, and all that | Mizel, Ari; Yanay, Yariv | We consider the theory of fluxonium qubits and distill crucial features that reduce vulnerability to charge noise. | Session 59: Superconducting Qubits: Noise and Decoherence |

904 | Simulations of Magnetic Noise in Classical XY and Heisenberg Spin Models | Mickelsen, Daniel; Wang, Hui; Wang, Zhe; Wu, Ruqian; Yu, Clare | With input from density functional theory calculations of magnetic impurities, we present the results of Monte Carlo simulations of the magnetic noise produced by coupled classical XY and Heisenberg spins in 2D lattices. | Session 59: Superconducting Qubits: Noise and Decoherence |

905 | Experimental study of flux noise in nanowire transmons subject to an applied magnetic field | Stavenga, Thijs; Luthi, Florian; Assendelft, Joep; Thoen, David; Endo, Akira; Krogstrup, Peter; DiCarlo, Leonardo | In this work, we experimentally investigate flux noise using an unconventional knob for circuit QED: an applied in-plane magnetic field. | Session 59: Superconducting Qubits: Noise and Decoherence |

906 | Measuring Quantum Noise Limits in Superconducting Digital Circuits | Lee, Aaron; Stoutimore, Micah; Przybysz, John; Pesetski, Aaron; Oberg, Oliver; Mungo, Nathan; Medford, James; Graninger, Lewis | Here we demonstrate a technique for measuring the quantum crossover temperature for a superconducting digital circuit by examining the width of the transition from operation to failure in a basic Reciprocal Quantum Logic digital circuit. | Session 59: Superconducting Qubits: Noise and Decoherence |

907 | Fast Parametric Gates with Superconducting Qubits | Jin, X. Y.; Kotler, Shlomi; Cicak, Katarina; Lecocq, Florent; Teufel, John; Aumentado, Jose; Simmonds, Raymond | We present the latest experiment results on the gate operation. | Session 60: Superconducting Qubits: Quantum Gates |

908 | Fault-tolerant photon-number selective phase gate in circuit quantum electrodynamics | Ma, Wen-Long; Noh, Kyungjoo; Reinhold, Philip; Rosenblum, Serge; Girvin, Steven; Schoelkopf, Robert; Jiang, Liang | Here we show that by using a multi-level transmon and conditional evolution on the transmon state after the gate, the SNAP gate can be made fault-tolerant to the dominant transmon relaxation and dephasing errors. | Session 60: Superconducting Qubits: Quantum Gates |

909 | High-fidelity conditional two-qubit swapping gate using tunable ancillas | Loft, Niels Jakob; Kjærgaard, Morten; Kristensen, Lasse; Andersen, Christian Kraglund; Larsen, Thorvald; Gustavsson, Simon; Oliver, William; Zinner, Nikolaj | Here we demonstrate that four coupled qubits can operate as a high-fidelity two-qubit entangling gate that swaps two target qubits and adds a relative sign on the |11? state (ZSWAP). | Session 60: Superconducting Qubits: Quantum Gates |

910 | Implementation of a Walsh-Hadamard gate in a superconducting qutrit | Yurtalan, Muhammet Ali; Shi, Jiahao; Lupascu, Adrian; Ashhab, Sahel | We present the experimental demonstration of a generalized Walsh-Hadamard gate, which is a Quantum Fourier Transform gate, for a qutrit embedded in the lowest three energy levels of a superconducting circuit. | Session 60: Superconducting Qubits: Quantum Gates |

911 | Microwave-based CPHASE gates for transmon qubits | Barron, George; Calderon-Vargas, Fernando; Economou, Sophia | Here we design such microwave-based gates using an analytically solvable approach leading to smooth, simple pulses. | Session 60: Superconducting Qubits: Quantum Gates |

912 | Limitations and improvements of two qubit gates in superconducting circuit QED | Naik, Ravi; Mitchell, Bradley; Baek, Unpil; Dahlen, Dar; Kreikebaum, John Mark; Ramasesh, Vinay; Blok, Machiel; Siddiqi, Irfan | We explore the sources of errors in these gates, include designs with employ cross-resonance and parametric interactions, and attempt to correct and/or mitigate the errors with hardware improvements, control sophistication, and algorithmic error suppression. | Session 60: Superconducting Qubits: Quantum Gates |

913 | Novel Two-qubit Gate Through Raman-type Transition | Royer, Baptiste; Krinner, Sebastian; Kurpiers, Philipp; Magnard, Paul; Wallraff, Andreas; Blais, Alexandre | In this talk, we propose an entangling gate for directly coupled superconducting qubits based on a Raman-type transition and numerically show that it is fast and high fidelity. | Session 60: Superconducting Qubits: Quantum Gates |

914 | Operation and error budget of the Cross-Resonance gate | Tripathi, Vinay; Khezri, Mostafa; Korotkov, Alexander | To understand these dependences, including saturation of the CNOT time at large ?, we develop analytical and semi-analytical theories, which agree well with the numerics. | Session 60: Superconducting Qubits: Quantum Gates |

915 | DEMUXYZ Gate Using Single Microwave Drive Line for Multiple Qubits | Earnest, Carolyn; Bejanin, Jeremy; Peters, Evan; Mariantoni, Matteo | In this talk, we introduce a new one-qubit gate: DEMUXYZ. | Session 60: Superconducting Qubits: Quantum Gates |

916 | Realistic simulations of flux-pulse-based controlled-phase gates in superconducting qubits | Battistel, Francesco; Rol, Michiel Adriaan; Malinowski, Filip K; Tarasinski, Brian; DiCarlo, Leonardo; Terhal, Barbara | We study the performance of the controlled-phase gate in flux-pulsed transmons by running extensive numerical simulations. | Session 60: Superconducting Qubits: Quantum Gates |

917 | Toward a Universal Gate Set on a Qubit Encoded in Superconducting Cavities | Curtis, Jacob; Lester, Brian; Wang, Christopher; Gao, Yvonne; Zhang, Yaxing; Frunzio, Luigi; Devoret, Michel; Jiang, Liang; Girvin, Steven; Schoelkopf, Robert | Here, we present our experimental progress towards mitigating these effects and enabling successive, high-fidelity pumped operations on states stored in these cavities. | Session 60: Superconducting Qubits: Quantum Gates |

918 | Two-Qubit Gates with Fluxonium Circuits. | Chen, Yinqi; Nesterov, Konstantin; Pechenezhskiy, Ivan; Qi, Zhenyi; Nguyen, Long; Lin, Yen-Hsiang; Somoroff, Aaron; Mencia, Ray; Manucharyan, Vladimir; Vavilov, Maxim | In this talk, we discuss various ways to make entangling gates between fluxoniums using noncomputational levels of the two-qubit system. | Session 60: Superconducting Qubits: Quantum Gates |

919 | Superadiabatic Stimulated Raman adiabatic passage in a three-level transmon | Vepsäläinen, Antti; Danilin, Sergey; Paraoanu, Sorin | Here I present an implementation of the superadiabatic protocol in a three-level system realized with a transmon superconducting circuit, where an additional control pulse is used to cancel the non-adiabatic evolution of the system. | Session 60: Superconducting Qubits: Quantum Gates |

920 | Realization of two-qubit gates with tunable couplers in superconducting circuits | Collodo, Michele; Herrmann, Johannes; Remm, Ants; Besse, Jean-Claude; Andersen, Christian; Krinner, Sebastian; Wallraff, Andreas; Eichler, Christopher | Here, we report on the design and implementation of a flux-tunable coupler, featuring small residual qubit-qubit interactions when gates are idle. | Session 60: Superconducting Qubits: Quantum Gates |

921 | A new class of randomized benchmarking protocols: theory and expiriment | Helsen, Jonas; Xue, Xiao; Vandersypen, Lieven; Wehner, Stephanie | I will discuss the theory of character randomized benchmarking, some example protocols such as benchmarking a T gate and performing two qubit interleaved randomized benchmarking using only single qubit gates as reference, and I will also precent some recent experimental implementations of character randomized benchmarking. | Session 61: Theory and Scaling of Benchmarking and Tomography |

922 | Randomized Benchmarking as Convolution | Merkel, Seth | We show that the standard randomized benchmarking protocol can be described as a convolution, and is thus amenable to Fourier analysis. | Session 61: Theory and Scaling of Benchmarking and Tomography |

923 | Randomized Benchmarking under Different Gatesets | Boone, Kristine; Carignan-Dugas, Arnaud; Wallman, Joel; Emerson, Joseph | We provide a comprehensive analysis of the differences between two important standards for randomized benchmarking (RB): the Clifford-group RB protocol proposed originally in [1] and [2], and a variant of that RB protocol proposed later by the NIST group in [3]. | Session 61: Theory and Scaling of Benchmarking and Tomography |

924 | On the freedom in representing quantum operations | Lin, Junan; Buonacorsi, Brandon; Laflamme, Raymond; Wallman, Joel | We propose an alternative operational figure of merit for a gate-set, the mean variation error, and a protocol for measuring this figure. | Session 61: Theory and Scaling of Benchmarking and Tomography |

925 | Using Fourier Analysis and Maximum Likelihood Estimation to Identify and Model Non-Markovian Noise in Quantum Operations | Simon, Garrett; Bruzewicz, Colin; Obenland, Kevin; Chuang, Isaac; Rines, Richard; Stuart, Jules; Niffenegger, Robert; Chiaverini, John; Sage, Jeremy | This information allowed us to hypothesize the sources of periodic noise, and create a time-dependent error model, or waveform, whose parameters we optimized to fit the measured data via maximum likelihood estimation. | Session 61: Theory and Scaling of Benchmarking and Tomography |

926 | Idle tomography: Efficient gate characterization for N-qubit processors | Blume-Kohout, Robin; Nielsen, Erik; Rudinger, Kenneth; Young, Kevin; Sarovar, Mohan; Proctor, Timothy | Here, we introduce a concrete reduced model of low-weight (few-qubit) errors on N qubits. | Session 61: Theory and Scaling of Benchmarking and Tomography |

927 | Randomized benchmarking of many-qubit devices | Proctor, Timothy; Rudinger, Kenneth; Blume-Kohout, Robin; Carignan-Dugas, Arnaud; Nielsen, Erik; Young, Kevin | In this talk, we present a series of modifications to Clifford randomized benchmarking that enable truly holistic benchmarking of entire devices. | Session 61: Theory and Scaling of Benchmarking and Tomography |

928 | Perturbative density matrix propagation in Gate Set Tomography | Nielsen, Erik; Blume-Kohout, Robin; Proctor, Timothy; Rudinger, Kenneth; Sarovar, Mohan; Young, Kevin | In this talk, we focus on the second issue and present a method for performing approximate density matrix propagation based on perturbative expansions of error generators. | Session 61: Theory and Scaling of Benchmarking and Tomography |

929 | Benchmarking the quantum processing power of large-scale quantum processors to execute specific programs | Emerson, Joseph; Wallman, Joel | We propose an experimentally measurable quantity, the circuit quality Q of any hardware implementation of a quantum circuit, which can be efficiently estimated via clock cycle benchmarking, and discuss how this quantity can be applied to two key applications of circuit benchmarking: (i) determining the size of a quantum program that can be run on specific quantum hardware to within a specified tolerance; and (ii) establishing a family of cross-platform benchmarks for overall hardware performance. | Session 61: Theory and Scaling of Benchmarking and Tomography |

930 | Efficient learning of Pauli channels: learning tensor network models. | Flammia, Steven; Wallman, Joel | Here we show that where we have a Pauli channel whose errors are have only k-local correlations we can learn the entire n-qubit Pauli channel to relative precision ? with only O(? -2 n 2 log(n)) measurements. | Session 61: Theory and Scaling of Benchmarking and Tomography |

931 | Efficient learning of Pauli channels: learning sparse models | Wallman, Joel; Flammia, Steven | Here we introduce estimation protocols with relative error guarantees that enable efficient reconstructions of both complete and sparse Pauli channels. | Session 61: Theory and Scaling of Benchmarking and Tomography |

932 | Experimental reconstruction of all correlated error rates on a 16 qubit device. | Harper, Robin; Flammia, Steven; Wallman, Joel; Emerson, Joseph | Using experimental results from the device we obtain and present complete information about the correlated error rates across the device, comparing device characteristics when qubits are operated in single qubit mode and with qubit-to-qubit interactions enabled. | Session 61: Theory and Scaling of Benchmarking and Tomography |

933 | Efficient Unitarity Randomized Benchmarking of Few-qubit Clifford Gates | Dirkse, Bas; Helsen, Jonas; Wehner, Stephanie | In this work we analyze the statistics of Clifford URB. | Session 61: Theory and Scaling of Benchmarking and Tomography |

934 | Probing coherent coupling of Majorana modes via single-electron photon assisted tunneling: Part 1 | Sabonis, Deividas; Van Zanten, David; Suter, Judith; Pikulin, Dmitry; Vayrynen, Jukka; Karzig, Torsten; O’Farrell, Eoin; Razmadze, Davydas; Petersson, Karl; Krogstrup, Peter; Marcus, Charles | We demonstrate the coherent coupling of zero modes in a superconducting double island created in a InAs/Al nanowire. | Session 62: Topological Quantum Information with Majorana Nanowires |

935 | Probing coherent coupling of Majorana modes via single-electron photon assisted tunneling: Part 2 | Van Zanten, David; Sabonis, Deividas; Suter, Judith; Pikulin, Dmitry; Vayrynen, Jukka; Karzig, Torsten; O’Farrell, Eoin; Razmadze, Davydas; Petersson, Karl; Krogstrup, Peter; Marcus, Charles | We demonstrate the coherent coupling of zero modes in a superconducting double island created in a InAs/Al nanowire. | Session 62: Topological Quantum Information with Majorana Nanowires |

936 | Single-shot readout of spin-orbit-split Andreev doublets: motivation and setup | Fatemi, Valla; Hays, Max; Serniak, Kyle; Bouman, Daniël; De Lange, Gijs; Diamond, Spencer; Krogstrup, Peter; Nygård, Jesper; Geresdi, Attila; Devoret, Michel | In this first part of a joint presentation, we will present the background and motivation, as well as the experimental setup and a theoretical model for our system. | Session 62: Topological Quantum Information with Majorana Nanowires |

937 | Single-shot readout of spin-orbit-split Andreev doublets: experimental data | Hays, Max; Fatemi, Valla; Serniak, Kyle; Bouman, Daniël; De Lange, Gijs; Diamond, Spencer; Krogstrup, Peter; Nygård, Jesper; Geresdi, Attila; Devoret, Michel | In this second part of a joint presentation, we will describe the experimental data and discuss the outlook. | Session 62: Topological Quantum Information with Majorana Nanowires |

938 | Entangling Spins in Double Quantum Dots and Majorana Bound States | Rancic, Marko; Hoffman, Silas; Schrade, Constantin; Klinovaja, Jelena; Loss, Daniel | We theoretically investigate the coupling between a singlet-triplet (ST) spin qubit realized in a double quantum dot and a topological qubit composed of Majorana bound states. | Session 62: Topological Quantum Information with Majorana Nanowires |

939 | Quasiparticle Poisoning in a Proximitized Semiconductor Nanowire Qubit | Uilhoorn, Willemijntje; Bargerbos, Arno; Kroll, James; Van Veen, Jasper; Yang, Chung-Kai; Nygård, Jesper; Krogstrup, Peter; Kouwenhoven, Leo; Kou, Angela; De Lange, Gijs | Here we perform QPP measurements on nanowire transmons in a magnetic field by monitoring parity-dependent shifts of the transmon’s readout resonator. | Session 62: Topological Quantum Information with Majorana Nanowires |

940 | Little-Parks effect in a semiconducting nanowire-based superconducting qubit with in-situ switching between transport and cQED | Kringhøj, Anders; Larsen, Thorvald; Erlandsson, Oscar; Sabonis, Deividas; Van Heck, Bernard; Petkovic, Ivana; McNeil, Robert; Hesselberg, Marina; Telecka, Agnieszka; Yadav, Sachin; Parfeniukas, Karolis; Jambunathan, Karthik; Krogstrup, Peter; Casparis, Lucas; Marcus, Charles; Petersson, Karl | Here we demonstrate in-situ switching between coherent cQED measurements and transport measurements based on a full-shell nanowire using a Josephson junction as a gate tuneable switch. | Session 62: Topological Quantum Information with Majorana Nanowires |

941 | Cavity-based readout and control of Majorana qubits | Smith, Thomas; Grimsmo, Arne; Bartlett, Stephen; Doherty, Andrew | We discuss readout and control protocols based on coupling Majorana bound states to cavities. | Session 62: Topological Quantum Information with Majorana Nanowires |

942 | Nonlinear quantum optics for the characterization of Majorana qubits | Boutin, Samuel; Mu, Anqi; Lopes, Pedro; Mendes, Udson; Garate, Ion | As a step in this direction, we investigate how the phenomenon of bifurcation in nonlinear cavities, commonly used for measuring qubits, is altered in the presence of Majorana bound states. | Session 62: Topological Quantum Information with Majorana Nanowires |

943 | On-chip microwave spectroscopy of an InAs nanowire Cooper-pair transistor | Laroche, Dominique; Proutski, Alexander; van ‘t Hooft, Bas; Nygård, Jesper; Krogstrup, Peter; Kouwenhoven, Leo; Geresdi, Attila | Here, we present the study of Cooper-pair transistors (CPTs) fabricated from InAs nanowires with superconducting Al shell, a promising platform for the physical realization of topological qubits. | Session 62: Topological Quantum Information with Majorana Nanowires |

944 | Rapid single-shot detection of coherent tunneling in an InAs nanowire double quantum dot through dispersive gate sensing | De Jong, Damaz; Van Veen, Jasper; Binci, Luca; Singh, Amrita; Nygård, Jesper; Krogstrup, Peter; Kouwenhoven, Leo; Pfaff, Wolfgang; Watson, John | Here we demonstrate rapid detection of single-electron tunneling between InAs nanowire quantum dots. | Session 62: Topological Quantum Information with Majorana Nanowires |

945 | Dispersive gate-sensing of a quantum dot coupled to a superconducting island | Van Veen, Jasper; de Jong, Damaz; Han, Lin; Prosko, Christian; Karzig, Torsten; Krogstrup, Peter; Nygård, Jesper; Kouwenhoven, Leo; Watson, John; Pfaff, Wolfgang | We focus on two regimes characterized by their coupling to the leads. | Session 62: Topological Quantum Information with Majorana Nanowires |

946 | Observation of quantized conductance in quantum point contacts on near surface InAsSb quantum wells | Pendharkar, Mihir; Lee, Joon Sue; Seas, Michael; McFadden, Anthony; Guo, Taozhi; Dempsey, Connor; Harrington, Sean; Pennachio, Daniel; Brown-Heft, Tobias; Inbar, Hadass; Palmstrom, Chris | In this work, top gate control of electron density in near surface InAsSb 2DEGs has been demonstrated. | Session 62: Topological Quantum Information with Majorana Nanowires |

947 | Majorana fermions in nanowire-superconductor systems in periodic magnetic fields and their resonant manipulation | Kornich, Viktoriia; Huang, Xiaoli; Vavilov, Maxim; Friesen, Mark; Eriksson, M.; Coppersmith, Susan; Nazarov, Y. | Tuning modulations on 4 gates, we aim to achieve an arbitrary unitary transformation on Majorana subspace. | Session 62: Topological Quantum Information with Majorana Nanowires |

948 | Robust micro-magnet geometries for Majorana modes in low g-factor materials | Turcotte, Sara; Boutin, Samuel; Camirand Lemyre, Julien; Garate, Ion; Pioro-Ladriere, Michel | In this work, we explore a versatile approach where spin-orbit coupling arises from a non-uniform magnetic field produced by a micro-magnet array [3]. | Session 62: Topological Quantum Information with Majorana Nanowires |

949 | Spurious topological entanglement entropy and subsystem symmetries in compactified cubic code | Williamson, Dominic; Dua, Arpit; Cheng, Meng | We introduce an entropic quantity that measures the presence of such spurious contributions. | Session 63: Topological Stabilization of Memory and Computation |

950 | Low overhead Clifford gates from joint measurements in surface, color, and hyperbolic codes | Hosseini Lavasani, Seyed Ali; Barkeshli, Maissam | In this work, we show that within any encoding scheme for the logical qubits, we can fault-tolerantly implement the full Clifford group by using joint measurements involving a single appropriately encoded logical ancilla. | Session 63: Topological Stabilization of Memory and Computation |

951 | Universal logical gate sets on encoded qubits using constant depth unitary circuits | Barkeshli, Maissam | In this talk, I will demonstrate how braiding and Dehn twists in arbitrary (Abelian and non-Abelian) topological codes can be implemented through constant depth unitary circuits, where the depth is independent of the code distance. | Session 63: Topological Stabilization of Memory and Computation |

952 | Exotic quantum wires from symmetry-enriched topological order interfaces | Ding, Weiyi; Jiang, Shenghan; Alicea, Jason | We study such interfaces when one of the two phases is promoted to a symmetry-enriched topological order exhibiting an anyon-permuting symmetry. | Session 63: Topological Stabilization of Memory and Computation |

953 | Reading the quantum state change of Majorana braiding | Liu, Chun-Xiao; Chiu, Ching-Kai | In this talk, we propose an experimental protocol to read the braiding change of the Majorana zero modes. | Session 63: Topological Stabilization of Memory and Computation |

954 | Quantum Error-Correction for Fermionic Qubits | Vijay, Sagar | Motivated by on-going experiments, we introduce a variety of fermionic quantum codes that are able to correct for fermion parity-preserving and parity-violating (“quasiparticle poisoning”) errors. | Session 63: Topological Stabilization of Memory and Computation |

955 | Finite-temperature topological entanglement entropy for fractons | Li, Zhi; Mong, Roger | We consider the finite-temperature topological entanglement entropy (TEE) for topological-ordered systems. | Session 63: Topological Stabilization of Memory and Computation |

956 | Scalable Fermionic Error Correction in 2D Majorana Surface Codes | Viyuela, Oscar; Vijay, Sagar; Fu, Liang | In this talk, we show how purely fermionic errors (quasiparticle poisoning events) can be corrected provided the error rate is below a certain threshold. | Session 63: Topological Stabilization of Memory and Computation |

957 | Categorizing Fracton Topological Order | Dua, Arpit; Williamson, Dominic; Cheng, Meng | We employ quantities generalizing the two-dimensional S-matrix invariant to categorize 3D stabilizers models into type-I fracton models, type-II fracton models, TQFTs and stacks of 2D Toric codes. | Session 63: Topological Stabilization of Memory and Computation |

958 | Classifying Subsystem Symmetry Protected Topological Phases | Devakul, Trithep; Williamson, Dominic; You, Yizhi; Burnell, Fiona; Sondhi, Shivaji | We discuss symmetry protected topological (SPT) phases in 2D systems with subsystem symmetries: symmetries which act on rigid subsystems, such as along straight lines or fractals. | Session 63: Topological Stabilization of Memory and Computation |

959 | A braiding quantum circuit based on the 4? Josephson effect | Stenger, John; Hatridge, Michael; Frolov, Sergey; Pekker, David | We propose a topological qubit in which braiding and readout are mediated by the 4? Majorana-Josephson effect. | Session 63: Topological Stabilization of Memory and Computation |