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PRX Quantum - April 2023

PRX Quantum

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Volume 4, Issue 2 (partial)

April - June 2023
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Few-Body Analog Quantum Simulation with Rydberg-Dressed Atoms in Optical Lattices
Daniel Malz and J. Ignacio Cirac
PRX Quantum 4, 020301 (2023) – Published 3 April 2023

A proposal based on state-of-the-art quantum simulators shows how to explore long-range interactions so that central phenomena of quantum chemistry can be qualitatively investigated.

Accelerated Weak Signal Search Using Mode Entanglement and State Swapping
Y. Jiang, E.P. Ruddy, K.O. Quinlan, M. Malnou, N.E. Frattini, and K.W. Lehnert
PRX Quantum 4, 020302 (2023) – Published 6 April 2023

A quantum-enhanced sensing technique based on two cavities coupled via a Josephson ring modulator is developed to substantially accelerate a detection scan rate, ultimately boosting significantly the search of axions.

Logical Blocks for Fault-Tolerant Topological Quantum Computation
Héctor Bombín, Chris Dawson, Ryan V. Mishmash, Naomi Nickerson, Fernando Pastawski, and Sam Roberts
PRX Quantum 4, 020303 (2023) – Published 7 April 2023

A comprehensive and platform-independent framework for universal fault-tolerant logic is presented, enabling mapping from an abstract description of the logical gate to a precise set of physical instructions.

Density-Matrix Renormalization Group Algorithm for Simulating Quantum Circuits with a Finite Fidelity
Thomas Ayral, Thibaud Louvet, Yiqing Zhou, Cyprien Lambert, E. Miles Stoudenmire, and Xavier Waintal
PRX Quantum 4, 020304 (2023) – Published 10 April 2023

An algorithm to simulate NISQ quantum circuits that uses iteratively compressed tensor networks leads to impressive capabilities and rivals experimental demonstrations of "quantum supremacy."

Blueprint of a Scalable Spin Qubit Shuttle Device for Coherent Mid-Range Qubit Transfer in Disordered Si/SiGe/SiO2
Veit Langrock, Jan A. Krzywda, Niels Focke, Inga Seidler, Lars R. Schreiber, and Łukasz Cywiński
PRX Quantum 4, 020305 (2023) – Published 11 April 2023

Protocols for connecting qubits based on electrons in silicon quantum dots are proposed, highlighting opportunities and challenges for the implementation of coherent electron shuttling.

Realization of a Multi-Output Quantum Pulse Gate for Decoding High-Dimensional Temporal Modes of Single-Photon States
Laura Serino, Jano Gil-Lopez, Michael Stefszky, Raimund Ricken, Christof Eigner, Benjamin Brecht, and Christine Silberhorn
PRX Quantum 4, 020306 (2023) – Published 12 April 2023

A new method to decode high-dimensional information imprinted on temporal modes is introduced and experimentally demonstrated.

Effective-Hamiltonian Theory of Open Quantum Systems at Strong Coupling
Nicholas Anto-Sztrikacs, Ahsan Nazir, and Dvira Segal
PRX Quantum 4, 020307 (2023) – Published 13 April 2023

A new technique for open quantum dynamics, combining reaction coordinate mappings and the polaron transform, allows for efficient description of strong system-bath couplings, opening the way for novel applications in nanoscale transport and thermodynamics.

Memory and Transduction Prospects for Silicon T Center Devices
Daniel B. Higginbottom, Faezeh Kimiaee Asadi, Camille Chartrand, Jia-Wei Ji, Laurent Bergeron, Michael L.W. Thewalt, Christoph Simon, and Stephanie Simmons
PRX Quantum 4, 020308 (2023) – Published 17 April 2023

Proof-of-principle measurements inform quantum memory and transduction protocols for T center ensembles.

Extending the Laws of Thermodynamics for Arbitrary Autonomous Quantum Systems
Cyril Elouard and Camille Lombard Latune
PRX Quantum 4, 020309 (2023) – Published 18 April 2023

Energy exchanges between arbitrary quantum systems are shown to obey thermodynamic laws, opening the way for the characterization of autonomous thermal devices at the microscale fueled by quantum, nonideal energy sources.

Sampling Complexity of Open Quantum Systems
I.A. Aloisio, G.A.L. White, C.D. Hill, and K. Modi
PRX Quantum 4, 020310 (2023) – Published 19 April 2023

The investigation of open quantum systems from a complexity-theoretic perspective is possible under the lens of a multitime sampling problem.

Witnessing Nonclassicality in a Causal Structure with Three Observable Variables
Pedro Lauand, Davide Poderini, Ranieri Nery, George Moreno, Lucas Pollyceno, Rafael Rabelo, and Rafael Chaves
PRX Quantum 4, 020311 (2023) – Published 20 April 2023

A new scenario for three observable causal structures is analyzed, going beyond Bell's model and providing novel insights into whether nonclassical correlations can arise from it.

Reminiscence of Classical Chaos in Driven Transmons
Joachim Cohen, Alexandru Petrescu, Ross Shillito, and Alexandre Blais
PRX Quantum 4, 020312 (2023) – Published 21 April 2023

Dispersive readout of a transmon's computational states is strongly impacted by unaccounted chaotic dynamics that are often present under regular experimental conditions.

Leveraging Small-Scale Quantum Computers with Unitarily Downfolded Hamiltonians
Renke Huang, Chenyang Li, and Francesco A. Evangelista
PRX Quantum 4, 020313 (2023) – Published 24 April 2023

A quantum unitary downfolding formalism that works on noisy and fault-tolerant hardware is proposed and tested on several challenging chemical problems, offering a viable approach for estimating molecular properties with chemical accuracy.

Phase-Space Geometry and Optimal State Preparation in Quantum Metrology with Collective Spins
Manuel H. Muñoz-Arias, Ivan H. Deutsch, and Pablo M. Poggi
PRX Quantum 4, 020314 (2023) – Published 25 April 2023

A unified description is presented that allows the optimal state preparation of collective spin systems for quantum metrology based on the spins' semiclassical dynamics.

Deterministic Constant-Depth Preparation of the AKLT State on a Quantum Processor Using Fusion Measurements
Kevin C. Smith, Eleanor Crane, Nathan Wiebe, and S.M. Girvin
PRX Quantum 4, 020315 (2023) – Published 26 April 2023

A class of symmetry-protected topological states relevant for measurement-based quantum computation is shown to be constructible using only constant-depth quantum circuits by leveraging symmetries, midcircuit measurements, and feed forward.

Quantum Tomography of Rydberg Atom Graphs by Configurable Ancillas
Kangheun Kim and Jaewook Ahn
PRX Quantum 4, 020316 (2023) – Published 27 April 2023

A quantum state tomography method with continuously tunable measurement operators is experimentally explored, showing reliable high-fidelity full quantum state reconstruction of Rydberg atom arrays.

Editors' Suggestion
Controlling Two-Dimensional Coulomb Crystals of More Than 100 Ions in a Monolithic Radio-Frequency Trap
Dominik Kiesenhofer, Helene Hainzer, Artem Zhdanov, Philip C. Holz, Matthias Bock, Tuomas Ollikainen, and Christian F. Roos
PRX Quantum 4, 020317 (2023) – Published 28 April 2023

Stationary, 2D ion crystals of more than 100 ions are carefully characterized and cooled to near the ground state, paving the way for new quantum simulations with long-range interactions.

Experimental Observation of Thermalization with Noncommuting Charges
Florian Kranzl, Aleksander Lasek, Manoj K. Joshi, Amir Kalev, Rainer Blatt, Christian F. Roos, and Nicole Yunger Halpern
PRX Quantum 4, 020318 (2023) – Published 28 April 2023

Thermodynamics of noncommuting charges is experimentally probed using a trapped-ion simulator, demonstrating the thermalization of a many-body system to a non-Abelian thermal state.

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