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PRX Quantum - August 2023

PRX Quantum

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Volume 4, Issue 3 (partial)

July - September 2023
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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.

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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
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Focus: Error Rate Reduced for Scalable Quantum Technology

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.

Featured in Physics
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.

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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