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PRX Quantum - July 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.

Featured in Physics
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
Physics logo
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.

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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