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PRX Quantum - December 2022

PRX Quantum

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Volume 3, Issue 4

October - December 2022
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Editorial: A Welcoming Home for Applied Science
Jessica Thomas and Michael Thoennessen
PRX Quantum 3, 040001 (2022) – Published 11 October 2022
Spinor Matter-Wave Control with Nanosecond Spin-Dependent Kicks
Liyang Qiu, Lingjing Ji, Jiangyong Hu, Yizun He, Yuzhuo Wang, and Saijun Wu
PRX Quantum 3, 040301 (2022) – Published 3 October 2022

An enhanced quantum manipulation technique is demonstrated, allowing fast and precise control of multicomponent atomic matterwave.

Local Variational Quantum Compilation of Large-Scale Hamiltonian Dynamics
Kaoru Mizuta, Yuya O. Nakagawa, Kosuke Mitarai, and Keisuke Fujii
PRX Quantum 3, 040302 (2022) – Published 5 October 2022

A quantum algorithm, based on the Lieb-Robinson bound, is developed to accurately and efficiently compile time-evolution operators, providing extensive proofs that certify the performance of the method.

Optimal Scaling Quantum Linear-Systems Solver via Discrete Adiabatic Theorem
Pedro C.S. Costa, Dong An, Yuval R. Sanders, Yuan Su, Ryan Babbush, and Dominic W. Berry
PRX Quantum 3, 040303 (2022) – Published 7 October 2022

A quantum algorithm for solving linear systems that is asymptotically optimal is developed, matching a known lower bound on the complexity and easing its practical implementation.

Distinguishing Parity-Switching Mechanisms in a Superconducting Qubit
S. Diamond, V. Fatemi, M. Hays, H. Nho, P. D. Kurilovich, T. Connolly, V. R. Joshi, K. Serniak, L. Frunzio, L. I. Glazman, and M. H. Devoret
PRX Quantum 3, 040304 (2022) – Published 10 October 2022

An investigation of quasiparticle excitation dynamics in superconducting qubits, helping to inform the strategies one should use to mitigate single-charge-tunneling decoherence.

Ground-State Preparation and Energy Estimation on Early Fault-Tolerant Quantum Computers via Quantum Eigenvalue Transformation of Unitary Matrices
Yulong Dong, Lin Lin, and Yu Tong
PRX Quantum 3, 040305 (2022) – Published 12 October 2022

An algorithm for estimating ground-state energy that is suitable for early fault-tolerant quantum devices can achieve near-optimal complexity, according to a new proposal.

Secure Anonymous Conferencing in Quantum Networks
Federico Grasselli, Gláucia Murta, Jarn de Jong, Frederik Hahn, Dagmar Bruß, Hermann Kampermann, and Anna Pappa
PRX Quantum 3, 040306 (2022) – Published 13 October 2022

A security framework for anonymous conference key agreement with different levels of anonymity is introduced, suggesting that multipartite entanglement is a better option for cryptographic tasks involving several users.

Protecting Fiber-Optic Quantum Key Distribution Sources against Light-Injection Attacks
Anastasiya Ponosova, Daria Ruzhitskaya, Poompong Chaiwongkhot, Vladimir Egorov, Vadim Makarov, and Anqi Huang
PRX Quantum 3, 040307 (2022) – Published 14 October 2022

A clever defense strategy against light-injection attacks helps boost the security of practical quantum key distribution.

Editors' Suggestion
Analog Quantum Simulation of the Dynamics of Open Quantum Systems with Quantum Dots and Microelectronic Circuits
Chang Woo Kim, John M. Nichol, Andrew N. Jordan, and Ignacio Franco
PRX Quantum 3, 040308 (2022) – Published 17 October 2022

A proposed quantum simulation architecture captures the effects of highly structured non-Markovian quantum environments, such as those found in chemical dynamics.

Dynamical Hadron Formation in Long-Range Interacting Quantum Spin Chains
Joseph Vovrosh, Rick Mukherjee, Alvise Bastianello, and Johannes Knolle
PRX Quantum 3, 040309 (2022) – Published 19 October 2022

Novel hadronic bound states in a long-range spin model are investigated, and two distinct controllable protocols indicate how one can clearly observe dynamical hadron formation.

Editors' Suggestion
Experimental Single-Setting Quantum State Tomography
Roman Stricker, Michael Meth, Lukas Postler, Claire Edmunds, Chris Ferrie, Rainer Blatt, Philipp Schindler, Thomas Monz, Richard Kueng, and Martin Ringbauer
PRX Quantum 3, 040310 (2022) – Published 21 October 2022

An experimental demonstration of scalable system characterization via classical-shadow-based single-setting quantum state tomography.

Continuous Quantum Gate Sets and Pulse-Class Meta-Optimization
Francesco Preti, Tommaso Calarco, and Felix Motzoi
PRX Quantum 3, 040311 (2022) – Published 25 October 2022

Machine-learning methods to easy gate optimization are presented, allowing one to find optimal control pulses that depend adaptively on a vast landscape of parameters.

Editors' Suggestion
Unconventional Floquet Topological Phases from Quantum Engineering of Band-Inversion Surfaces
Long Zhang and Xiong-Jun Liu
PRX Quantum 3, 040312 (2022) – Published 27 October 2022

Using a new approach to access band structures, a systematic and high-precision scheme to realize, manipulate, and detect unconventional Floquet topological phases on quantum simulators is developed.

Quantum Error Mitigation via Matrix Product Operators
Yuchen Guo and Shuo Yang
PRX Quantum 3, 040313 (2022) – Published 31 October 2022

A quantum algorithm based on the tensor network representation of quantum channels is developed to characterize and mitigate correlated noise in deep quantum circuits.

Beyond Hard-Core Bosons in Transmon Arrays
Olli Mansikkamäki, Sami Laine, Atte Piltonen, and Matti Silveri
PRX Quantum 3, 040314 (2022) – Published 2 November 2022

Describing the dynamics of highly excited states of coupled transmons in a unified, compact, and accurate manner is now possible, allowing investigation of various collective phenomena, such as edge localization and longer-range interactions.

Methods for Simulating String-Net States and Anyons on a Digital Quantum Computer
Yu-Jie Liu, Kirill Shtengel, Adam Smith, and Frank Pollmann
PRX Quantum 3, 040315 (2022) – Published 7 November 2022

A scheme that uses linear-depth quantum circuits allows one to efficiently prepare topologically ordered states and directly probe properties such as braiding statistics and fusion channels of anyons.

Tuning the Topological θ-Angle in Cold-Atom Quantum Simulators of Gauge Theories
Jad C. Halimeh, Ian P. McCulloch, Bing Yang, and Philipp Hauke
PRX Quantum 3, 040316 (2022) – Published 9 November 2022

How to quantum simulate high-energy physics: a detailed proposal on how to experimentally engineer a tunable topological term to probe confinement on a cold-atom-based platform.

Tunable Confinement-Deconfinement Transition in an Ultracold-Atom Quantum Simulator
Yanting Cheng, Shang Liu, Wei Zheng, Pengfei Zhang, and Hui Zhai
PRX Quantum 3, 040317 (2022) – Published 9 November 2022

A recipe on how to prepare experiments and provide evidence of high-energy physics effects using cold-atom quantum simulators.

Featured in Physics
Simulating Models of Challenging Correlated Molecules and Materials on the Sycamore Quantum Processor
Ruslan N. Tazhigulov, Shi-Ning Sun, Reza Haghshenas, Huanchen Zhai, Adrian T.K. Tan, Nicholas C. Rubin, Ryan Babbush, Austin J. Minnich, and Garnet Kin-Lic Chan
PRX Quantum 3, 040318 (2022) – Published 14 November 2022

Two problems of interest in chemistry and materials science are tested on a quantum processor used for quantum advantage experiments.

Entanglement Distribution with Minimal Memory Requirements Using Time-Bin Photonic Qudits
Yunzhe Zheng, Hemant Sharma, and Johannes Borregaard
PRX Quantum 3, 040319 (2022) – Published 16 November 2022

A qudit-based entanglement distribution protocol allows bypass of the strict memory requirements inflicted by the deleterious loss between transmission nodes and, as a result, boosts the performance of near-term quantum networks.

Remarkable Prospect for Quantum-Dot-Coupled Tin Qubits in Silicon
Wayne M. Witzel, Jesse J. Lutz, and Dwight R. Luhman
PRX Quantum 3, 040320 (2022) – Published 18 November 2022

Isoelectronic defects, specifically Sn with a spin-½ nucleus, are proposed as the quantum bits in a quantum processor, with internuclear operations mediated by smoothly shuttling electrons from one qubit to another.

Magnetoelectric Cavity Magnonics in Skyrmion Crystals
Tomoki Hirosawa, Alexander Mook, Jelena Klinovaja, and Daniel Loss
PRX Quantum 3, 040321 (2022) – Published 21 November 2022

A detailed investigation shows that a novel hybrid platform can be used to realize all-electrical quantum gates in multiferroic topological magnets.

Multipartite Entanglement in Rabi-Driven Superconducting Qubits
Marie Lu, Jean-Loup Ville, Joachim Cohen, Alexandru Petrescu, Sydney Schreppler, Larry Chen, Christian Jünger, Chiara Pelletti, Alexei Marchenkov, Archan Banerjee, William P. Livingston, John Mark Kreikebaum, David I. Santiago, Alexandre Blais, and Irfan Siddiqi
PRX Quantum 3, 040322 (2022) – Published 23 November 2022

A novel protocol for implementing high-fidelity multiqubit gates based on Rabi-driven all-to-all connected superconducting qubit networks is experimentally demonstrated.

Role of Quantum Coherence in Thermodynamics
Gilad Gour
PRX Quantum 3, 040323 (2022) – Published 28 November 2022

The resource theory of thermodynamics is revisited, introducing new results and insights on the interplay between quantum coherence and irreversibility and how it affects the convertibility of quantum systems in both single-shot and asymptotic regimes.

Simulating Dynamical Phases of Chiral p+ip Superconductors with a Trapped ion Magnet
Athreya Shankar, Emil A. Yuzbashyan, Victor Gurarie, Peter Zoller, John J. Bollinger, and Ana Maria Rey
PRX Quantum 3, 040324 (2022) – Published 30 November 2022

A proposal to use trapped-ion crystals in a Penning trap to simulate and probe topological superconductivity; the work paves the way to prepare and manipulate skyrmionic spin textures.

Measurement Incompatibility versus Bell Nonlocality: An Approach via Tensor Norms
Faedi Loulidi and Ion Nechita
PRX Quantum 3, 040325 (2022) – Published 2 December 2022

Measurement incompatibility and Bell nonlocality are connected using tensor norms, generalizing the CHSH nonlocal game to all XOR games.

Error Propagation in NISQ Devices for Solving Classical Optimization Problems
Guillermo González-García, Rahul Trivedi, and J. Ignacio Cirac
PRX Quantum 3, 040326 (2022) – Published 5 December 2022

A random circuit model is devised to analyze the impact of noise in NISQ devices on solving optimization problems with variational algorithms.

Importance of the Spectral gap in Estimating Ground-State Energies
Abhinav Deshpande, Alexey V. Gorshkov, and Bill Fefferman
PRX Quantum 3, 040327 (2022) – Published 9 December 2022

The circuit complexity in preparing the ground state of a Hamiltonian is studied as a function of the spectral gap—the energy difference between the ground and the first excited state—and an optimistic outlook for quantum variational methods is presented.

Featured in Physics
Probing Spin Dynamics on Diamond Surfaces Using a Single Quantum Sensor
Bo L. Dwyer, Lila V.H. Rodgers, Elana K. Urbach, Dolev Bluvstein, Sorawis Sangtawesin, Hengyun Zhou, Yahia Nassab, Mattias Fitzpatrick, Zhiyang Yuan, Kristiaan De Greve, Eric L. Peterson, Helena Knowles, Tamara Sumarac, Jyh-Pin Chou, Adam Gali, V.V. Dobrovitski, Mikhail D. Lukin, and Nathalie P. de Leon
PRX Quantum 3, 040328 (2022) – Published 14 December 2022

A detailed analysis of the coherence decay of a nanoscale sensor shows that ubiquitous spins on the diamond surface are mobile and reveals the potential of local sensors to investigate the dynamics of complex systems.

Editors' Suggestion
Tight Bounds on the Convergence of Noisy Random Circuits to the Uniform Distribution
Abhinav Deshpande, Pradeep Niroula, Oles Shtanko, Alexey V. Gorshkov, Bill Fefferman, and Michael J. Gullans
PRX Quantum 3, 040329 (2022) – Published 16 December 2022

Properties of noisy random circuits are investigated, uncovering relevant consequences for the tightness of proof techniques in the field of quantum computational advantage.

Optimal Cold Atom Thermometry Using Adaptive Bayesian Strategies
Jonas Glatthard, Jesús Rubio, Rahul Sawant, Thomas Hewitt, Giovanni Barontini, and Luis A. Correa
PRX Quantum 3, 040330 (2022) – Published 19 December 2022

Recently developed adaptive Bayesian methods allow for more precise and reliable quantum thermometry from less measurements, as demonstrated in release-recapture experiments with microkelvin-cooled potassium atoms trapped in an optical tweezer.

Construction and Local Equivalence of Dual-Unitary Operators: From Dynamical Maps to Quantum Combinatorial Designs
Suhail Ahmad Rather, S. Aravinda, and Arul Lakshminarayan
PRX Quantum 3, 040331 (2022) – Published 20 December 2022

Novel insights are provided on the practical construction of dual-unitary circuits, a rare type of exactly soluble many-body quantum dynamics exhibiting nonintegrability and quantum chaos.

Identification of Different Types of High-Frequency Defects in Superconducting Qubits
Leonid V. Abdurakhimov, Imran Mahboob, Hiraku Toida, Kosuke Kakuyanagi, Yuichiro Matsuzaki, and Shiro Saito
PRX Quantum 3, 040332 (2022) – Published 21 December 2022

A spectroscopic method is developed and applied to characterize qubit-defect interactions, providing essential feedback for fabrication process optimization and the development of realistic noise models.

Qubit Assignment Using Time Reversal
Evan Peters, Prasanth Shyamsundar, Andy C.Y. Li, and Gabriel Perdue
PRX Quantum 3, 040333 (2022) – Published 22 December 2022

The Loschmidt echo, a method for probing reversibility in quantum systems, is used in conjunction with simulated annealing to provide a scalable and flexible approach to optimizing qubit assignment on near-term hardware.

Power of a Quasispin Quantum Otto Engine at Negative Effective Spin Temperature
Jens Nettersheim, Sabrina Burgardt, Quentin Bouton, Daniel Adam, Eric Lutz, and Artur Widera
PRX Quantum 3, 040334 (2022) – Published 23 December 2022

A negative-temperature quantum heat engine is experimentally implemented with a single Cs atom in an Rb bath, demonstrating how negative temperatures can both enhance the output power and reduce fluctuations in comparison to positive temperatures.

Editors' Suggestion
Parity and Singlet-Triplet High-Fidelity Readout in a Silicon Double Quantum Dot at 0.5 K
David J. Niegemann, Victor El-Homsy, Baptiste Jadot, Martin Nurizzo, Bruna Cardoso-Paz, Emmanuel Chanrion, Matthieu Dartiailh, Bernhard Klemt, Vivien Thiney, Christopher Bäuerle, Pierre-André Mortemousque, Benoit Bertrand, Heimanu Niebojewski, Maud Vinet, Franck Balestro, Tristan Meunier, and Matias Urdampilleta
PRX Quantum 3, 040335 (2022) – Published 26 December 2022

Rapid and high-fidelity single-shot readout of spins is demonstrated by combining scalable fabrication technology, Pauli spin blockade, and rf reflectometry on a single-lead quantum dot.

Fast High-Fidelity Gates for Galvanically-Coupled Fluxonium Qubits Using Strong Flux Modulation
D.K. Weiss, Helin Zhang, Chunyang Ding, Yuwei Ma, David I. Schuster, and Jens Koch
PRX Quantum 3, 040336 (2022) – Published 27 December 2022

A new coupling scheme between heavy fluxonium qubits—one of the least-noise-sensitive superconducting qubits—is introduced, predicting gate fidelities beyond state-of-the-art ones.

Measurement as a Shortcut to Long-Range Entangled Quantum Matter
Tsung-Cheng Lu, Leonardo A. Lessa, Isaac H. Kim, and Timothy H. Hsieh
PRX Quantum 3, 040337 (2022) – Published 28 December 2022

Adaptive circuits combining measurement and feedback are used to produce long-range entangled states using only low-depth circuits, overcoming limitations imposed by the Lieb-Robinson bounds.

Quasiparticles in Superconducting Qubits with Asymmetric Junctions
Giampiero Marchegiani, Luigi Amico, and Gianluigi Catelani
PRX Quantum 3, 040338 (2022) – Published 29 December 2022

An extensive analysis about how gap asymmetry affects qubit properties could lead to better engineering strategies.

Calibrating the Classical Hardness of the Quantum Approximate Optimization Algorithm
Maxime Dupont, Nicolas Didier, Mark J. Hodson, Joel E. Moore, and Matthew J. Reagor
PRX Quantum 3, 040339 (2022) – Published 30 December 2022

The fidelity of the QAOA algorithm is found to obey a scaling law associated with the bond dimension of matrix product states, benchmarking the performance of quantum hardware in realistic setups.

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