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EDITORIALS AND ANNOUNCEMENTS

To Review Is to Be

Randall D. Kamien

PRX Quantum 4, 030001 (2023) - Published 25 September, 2023

HIGHLIGHTED ARTICLES

Single Flux Quantum-Based Digital Control of Superconducting Qubits in a Multichip Module

C.H. Liu, A. Ballard, D. Olaya, D.R. Schmidt, J. Biesecker, T. Lucas, J. Ullom, S. Patel, O. Rafferty, A. Opremcak, K. Dodge, V. Iaia, T. McBroom, J.L. DuBois, P.F. Hopkins, S.P. Benz, B.L.T. Plourde, and R. McDermott

PRX Quantum 4, 030310 (2023) - Published 24 July, 2023

Integration of quantum bits and single flux quantum control elements in a multichip module provides a path to scaling, and an understanding of error mechanisms will guide future improvements in control fidelity.

Symmetry of Open Quantum Systems: Classification of Dissipative Quantum Chaos

Kohei Kawabata, Anish Kulkarni, Jiachen Li, Tokiro Numasawa, and Shinsei Ryu

PRX Quantum 4, 030328 (2023) - Published 29 August, 2023

A novel method to classify open quantum systems in terms of non-Hermitian operators sheds light on the interplay between coherent and dissipative dynamics, with applications to quantum chaos.

Repetitive Readout and Real-Time Control of Nuclear Spin Qubits in 171Yb Atoms

William Huie, Lintao Li, Neville Chen, Xiye Hu, Zhubing Jia, Won Kyu Calvin Sun, and Jacob P. Covey

PRX Quantum 4, 030337 (2023) - Published 18 September, 2023

An array of neutral atom qubits is measured nondestructively with a technique that retains them in their measured state, enabling repetitive real-time qubit control.

ARTICLES

Homomorphic Logical Measurements

Shilin Huang, Tomas Jochym-O’Connor, and Theodore J. Yoder

PRX Quantum 4, 030301 (2023) - Published 5 July, 2023

A generalization of the Shor and Steane constructions allows for measurement of select logical Pauli operators in error-correcting codes with reduced time and space overhead and opens the door to fault-tolerant implementations of logical gates.

Absence of Localization in Two-Dimensional Clifford Circuits

Tom Farshi, Jonas Richter, Daniele Toniolo, Arijeet Pal, and Lluis Masanes

PRX Quantum 4, 030302 (2023) - Published 6 July, 2023

Random Clifford circuits are studied, in theory and simulations, showing that the localization of the quantum dynamics disappears when moving from one to two spacial dimensions.

Shuttling an Electron Spin through a Silicon Quantum Dot Array

A.M.J. Zwerver, S.V. Amitonov, S.L. de Snoo, M.T. Mądzik, M. Rimbach-Russ, A. Sammak, G. Scappucci, and L.M.K. Vandersypen

PRX Quantum 4, 030303 (2023) - Published 7 July, 2023

A single-electron spin is shuttled through a distance of 80 µm in a quantum-dot-based array, showing a route for creating coherent links in scalable quantum computing architectures.

Quantum and Classical Correlations in Open Quantum Spin Lattices via Truncated-Cumulant Trajectories

Wouter Verstraelen, Dolf Huybrechts, Tommaso Roscilde, and Michiel Wouters

PRX Quantum 4, 030304 (2023) - Published 12 July, 2023

A new method for treating correlations in open many-body systems is proposed, combining quantum trajectories with hierarchical equations of motion.

Gradient-Ascent Pulse Engineering with Feedback

Riccardo Porotti, Vittorio Peano, and Florian Marquardt

PRX Quantum 4, 030305 (2023) - Published 13 July, 2023

Gradient-based quantum optimal control meets feedback.

Chiral Quantum Optics in the Bulk of Photonic Quantum Hall Systems

Daniele De Bernardis, Francesco S. Piccioli, Peter Rabl, and Iacopo Carusotto

PRX Quantum 4, 030306 (2023) - Published 14 July, 2023

A scheme is proposed to realize reconfigurable networks with arbitrary chiral connectivity based on the photonic quantum Hall effect.

Say NO to Optimization: A Nonorthogonal Quantum Eigensolver

Unpil Baek, Diptarka Hait, James Shee, Oskar Leimkuhler, William J. Huggins, Torin F. Stetina, Martin Head-Gordon, and K. Birgitta Whaley

PRX Quantum 4, 030307 (2023) - Published 17 July, 2023

A quantum algorithm provides high-quality wave-function ansätze without variational optimization and enables the computation of strongly correlated ground and excited states at polynomial cost.

Preparing and Analyzing Solitons in the Sine-Gordon Model with Quantum Gas Microscopes

Elisabeth Wybo, Alvise Bastianello, Monika Aidelsburger, Immanuel Bloch, and Michael Knap

PRX Quantum 4, 030308 (2023) - Published 19 July, 2023

A new way to probe and prepare solitons in the quantum sine-Gordon model using ultracold atoms is put forward.

Gating a Quantum Dot through the Sequential Removal of Single Electrons from a Nanoscale Floating Gate

Artem O. Denisov, Gordian Fuchs, Seong W. Oh, and Jason R. Petta

PRX Quantum 4, 030309 (2023) - Published 21 July, 2023

A new method to control gate-defined quantum dots in Si/SiGe heterostructures using atomic-force microscope tips is demonstrated.

Single Flux Quantum-Based Digital Control of Superconducting Qubits in a Multichip Module

C.H. Liu, A. Ballard, D. Olaya, D.R. Schmidt, J. Biesecker, T. Lucas, J. Ullom, S. Patel, O. Rafferty, A. Opremcak, K. Dodge, V. Iaia, T. McBroom, J.L. DuBois, P.F. Hopkins, S.P. Benz, B.L.T. Plourde, and R. McDermott

PRX Quantum 4, 030310 (2023) - Published 24 July, 2023

Integration of quantum bits and single flux quantum control elements in a multichip module provides a path to scaling, and an understanding of error mechanisms will guide future improvements in control fidelity.

Programmable N-Body Interactions with Trapped Ions

Or Katz, Marko Cetina, and Christopher Monroe

PRX Quantum 4, 030311 (2023) - Published 26 July, 2023

A new method to obtain N-body interactions using spin-dependent optical parametric driving is put forward.

Avoiding Leakage and Errors Caused by Unwanted Transitions in Lambda Systems

Arian Vezvaee, Evangelia Takou, Paul Hilaire, Matthew F. Doty, and Sophia E. Economou

PRX Quantum 4, 030312 (2023) - Published 28 July, 2023

A coherent population trapping scheme for gates and design protocols, applicable to a wide range of optically driven platforms, improves gate performance by several orders of magnitude.

Crystalline Quantum Circuits

Grace M. Sommers, David A. Huse, and Michael J. Gullans

PRX Quantum 4, 030313 (2023) - Published 31 July, 2023

Spacetime translation-invariant Clifford circuits exhibit a rich variety of dynamics, including fractal and nonfractal operator spreading, with applications to quantum error correction.

Bonsai Algorithm: Grow Your Own Fermion-to-Qubit Mappings

Aaron Miller, Zoltán Zimborás, Stefan Knecht, Sabrina Maniscalco, and Guillermo García-Pérez

PRX Quantum 4, 030314 (2023) - Published 1 August, 2023

Ternary trees can be used to design new fermion-to-qubit encodings.

Hermitian Bulk  –  Non-Hermitian Boundary Correspondence

Frank Schindler, Kaiyuan Gu, Biao Lian, and Kohei Kawabata

PRX Quantum 4, 030315 (2023) - Published 2 August, 2023

A connection between Hermitian and non-Hermitian topology is put forward.

Quantum-Classical Decomposition of Gaussian Quantum Environments: A Stochastic Pseudomode Model

Si Luo, Neill Lambert, Pengfei Liang, and Mauro Cirio

PRX Quantum 4, 030316 (2023) - Published 3 August, 2023

A new method introduces unphysical classical stochastic driving fields as a resource to simulate the effects of a non-Markovian environment on a quantum system.

Quantum Criticality Under Decoherence or Weak Measurement

Jong Yeon Lee, Chao-Ming Jian, and Cenke Xu

PRX Quantum 4, 030317 (2023) - Published 4 August, 2023

Novel quantum critical features are uncovered in conformal field theories subject to the decohering effects of weak environmental measurements.

Mixed-State Long-Range Order and Criticality from Measurement and Feedback

Tsung-Cheng Lu, Zhehao Zhang, Sagar Vijay, and Timothy H. Hsieh

PRX Quantum 4, 030318 (2023) - Published 7 August, 2023

Utilizing midcircuit measurement and unitary feedback, a general framework is proposed to realize mixed states with a variety of quantum orders, criticality, and long-range entanglement in finite time.

Making Trotterization Adaptive and Energy-Self-Correcting for NISQ Devices and Beyond

Hongzheng Zhao, Marin Bukov, Markus Heyl, and Roderich Moessner

PRX Quantum 4, 030319 (2023) - Published 9 August, 2023

A feedback loop technique is introduced to adapt step size and self-correct Trotter errors when simulating quantum dynamics.

Simulating Prethermalization Using Near-Term Quantum Computers

Yilun Yang, Arthur Christianen, Sandra Coll-Vinent, Vadim Smelyanskiy, Mari Carmen Bañuls, Thomas E. O’Brien, Dominik S. Wild, and J. Ignacio Cirac

PRX Quantum 4, 030320 (2023) - Published 11 August, 2023

The phenomenon of prethermalization and a novel error-mitigation scheme enable simulation of quantum dynamics on noisy quantum devices.

Long-Time Equilibration Can Determine Transient Thermality

Karen V. Hovhannisyan, Somayyeh Nemati, Carsten Henkel, and Janet Anders

PRX Quantum 4, 030321 (2023) - Published 14 August, 2023

A new concept of g-local thermality reveals that the transient dynamics of equilibrating many-body systems have much more structure than previously thought.

Dynamical Purification and the Emergence of Quantum State Designs from the Projected Ensemble

Matteo Ippoliti and Wen Wei Ho

PRX Quantum 4, 030322 (2023) - Published 16 August, 2023

A space-time duality of one-dimensional quantum circuits is used to prove novel constraints on the dynamical generation of universal state distributions.

Quantum Computation of Dynamical Quantum Phase Transitions and Entanglement Tomography in a Lattice Gauge Theory

Niklas Mueller, Joseph A. Carolan, Andrew Connelly, Zohreh Davoudi, Eugene F. Dumitrescu, and Kübra Yeter-Aydeniz

PRX Quantum 4, 030323 (2023) - Published 18 August, 2023

A quantum computer helps illuminate the physics of the early Universe and of hadron and ion colliders by solving for the nonequal time correlations and performing entanglement tomography of a strongly coupled gauge theory far from equilibrium.

Hamiltonian Extrema of an Arbitrary Flux-Biased Josephson Circuit

A. Miano, V.R. Joshi, G. Liu, W. Dai, P.D. Parakh, L. Frunzio, and M.H. Devoret

PRX Quantum 4, 030324 (2023) - Published 21 August, 2023

A new method to efficiently analyze and engineer the low-energy Hamiltonian of an arbitrary magnetically tunable superconducting quantum circuit.

Onset of Scrambling as a Dynamical Transition in Tunable-Range Quantum Circuits

Sridevi Kuriyattil, Tomohiro Hashizume, Gregory Bentsen, and Andrew J. Daley

PRX Quantum 4, 030325 (2023) - Published 23 August, 2023

Quantum circuits with tunable-range interactions can probe a new dynamical transition in the propagation of correlations in quantum circuits.

Waveguide QED with Quadratic Light-Matter Interactions

Uesli Alushi, Tomás Ramos, Juan José García-Ripoll, Roberto Di Candia, and Simone Felicetti

PRX Quantum 4, 030326 (2023) - Published 25 August, 2023

A theoretical study of quantum emitters quadratically coupled to propagating modes overcomes the intrinsic limitations of current waveguide-QED settings, including a no-go theorem on the CPHASE gate.

Universal Qudit Gate Synthesis for Transmons

Laurin E. Fischer, Alessandro Chiesa, Francesco Tacchino, Daniel J. Egger, Stefano Carretta, and Ivano Tavernelli

PRX Quantum 4, 030327 (2023) - Published 28 August, 2023

A new way of performing universal gates among qudits is put forward using higher-excited levels of transmon qubits.

Symmetry of Open Quantum Systems: Classification of Dissipative Quantum Chaos

Kohei Kawabata, Anish Kulkarni, Jiachen Li, Tokiro Numasawa, and Shinsei Ryu

PRX Quantum 4, 030328 (2023) - Published 29 August, 2023

A novel method to classify open quantum systems in terms of non-Hermitian operators sheds light on the interplay between coherent and dissipative dynamics, with applications to quantum chaos.

Transition Metal Ion Ensembles in Crystals as Solid-State Coherent Spin-Photon Interfaces: The Case of Nickel in Magnesium Oxide

E. Poem, S. Gupta, I. Morris, K. Klink, L. Singh, T. Zhong, S.S. Nicley, J.N. Becker, and O. Firstenberg

PRX Quantum 4, 030329 (2023) - Published 30 August, 2023

Transition-metal ions in crystals emerge from design principles as prime candidates for a telecom spin-photon interface operating at elevated temperatures.

Typical Correlation Length of Sequentially Generated Tensor Network States

Daniel Haag, Flavio Baccari, and Georgios Styliaris

PRX Quantum 4, 030330 (2023) - Published 31 August, 2023

Sequentially generated tensor network states in one and two spatial dimensions are found to be typically short-range correlated with a common correlation length across different measures.

Suppressing Recoil Heating in Levitated Optomechanics Using Squeezed Light

C. Gonzalez-Ballestero, J.A. Zielińska, M. Rossi, A. Militaru, M. Frimmer, L. Novotny, P. Maurer, and O. Romero-Isart

PRX Quantum 4, 030331 (2023) - Published 1 September, 2023

Recoil heating is tuned using squeezed light, thereby boosting the coherence time of optically levitated nanoparticles.

Switching the Magnetization in Quantum Antiferromagnets

Katrin Bolsmann, Asliddin Khudoyberdiev, and Götz S. Uhrig

PRX Quantum 4, 030332 (2023) - Published 5 September, 2023

A new type of time-dependent Schwinger boson mean-field theory is introduced to study the switching of the magnetization of antiferromagnets, expanding applications for data processing.

Measurement-Induced Phase Transitions on Dynamical Quantum Trees

Xiaozhou Feng, Brian Skinner, and Adam Nahum

PRX Quantum 4, 030333 (2023) - Published 6 September, 2023

An exact solution is provided for the measurement-induced phase transition in quantum tree tensor networks.

Holographic Quantum Simulation of Entanglement Renormalization Circuits

Sajant Anand, Johannes Hauschild, Yuxuan Zhang, Andrew C. Potter, and Michael P. Zaletel

PRX Quantum 4, 030334 (2023) - Published 7 September, 2023

It is demonstrated that MERA tensor networks can be used to holographically prepare critical ground states on a trapped-ion quantum computer.

Mean-Field Approximate Optimization Algorithm

Aditi Misra-Spieldenner, Tim Bode, Peter K. Schuhmacher, Tobias Stollenwerk, Dmitry Bagrets, and Frank K. Wilhelm

PRX Quantum 4, 030335 (2023) - Published 12 September, 2023

A quantum-inspired classical algorithm for optimization outperforms QAOA for some popular classes of problems, suggesting that a quantum advantage is likely not expected in these cases.

Superconducting Cavity Qubit with Tens of Milliseconds Single-Photon Coherence Time

Ofir Milul, Barkay Guttel, Uri Goldblatt, Sergey Hazanov, Lalit M. Joshi, Daniel Chausovsky, Nitzan Kahn, Engin Çiftyürek, Fabien Lafont, and Serge Rosenblum

PRX Quantum 4, 030336 (2023) - Published 14 September, 2023

A superconducting cavity qubit with coherence time an order of magnitude larger than the state of the art is demonstrated, showing the storage of a Schrödinger cat state with a record size of 1024 photons.

Repetitive Readout and Real-Time Control of Nuclear Spin Qubits in 171Yb Atoms

William Huie, Lintao Li, Neville Chen, Xiye Hu, Zhubing Jia, Won Kyu Calvin Sun, and Jacob P. Covey

PRX Quantum 4, 030337 (2023) - Published 18 September, 2023

An array of neutral atom qubits is measured nondestructively with a technique that retains them in their measured state, enabling repetitive real-time qubit control.

Tailoring Three-Dimensional Topological Codes for Biased Noise

Eric Huang, Arthur Pesah, Christopher T. Chubb, Michael Vasmer, and Arpit Dua

PRX Quantum 4, 030338 (2023) - Published 20 September, 2023

A weight-reduction technique allows the tailoring of various three-dimensional topological codes for enhanced storage performance and demystifies the occurrence of a 50 percent threshold for infinitely biased Pauli noise.

Quasiparticle Dynamics in Epitaxial Al-InAs Planar Josephson Junctions

Bassel Heiba Elfeky, William M. Strickland, Jaewoo Lee, James T. Farmer, Sadman Shanto, Azarin Zarassi, Dylan Langone, Maxim G. Vavilov, Eli M. Levenson-Falk, and Javad Shabani

PRX Quantum 4, 030339 (2023) - Published 22 September, 2023

Frequency and time-domain measurements of quasiparticle dynamics shed light on relevant timescales and underlying mechanisms.

Encoding Error Correction in an Integrated Photonic Chip

Hui Zhang, Lingxiao Wan, Stefano Paesani, Anthony Laing, Yuzhi Shi, Hong Cai, Xianshu Luo, Guo-Qiang Lo, Leong Chuan Kwek, and Ai Qun Liu

PRX Quantum 4, 030340 (2023) - Published 27 September, 2023

Teleporting encoded quantum information into a cluster state protects the state against errors and measuring stabilizers enables error identification.

Self-Correction from Higher-Form Symmetry Protection on a Boundary

Charles Stahl

PRX Quantum 4, 030341 (2023) - Published 29 September, 2023

Self-correcting quantum memories can be made using a smaller number of constraints than previously thought.

ERRATA

Erratum: Quantum Circuits with Classical Versus Quantum Control of Causal Order [PRX Quantum 2, 030335 (2021)]

Julian Wechs, Hippolyte Dourdent, Alastair A. Abbott, and Cyril Branciard

PRX Quantum 4, 030901 (2023) - Published 10 July, 2023

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