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PRX Quantum - December 2023

PRX Quantum

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Volume 4, Issue 4 (partial)

October - December 2023
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Tutorial
Quantum Many-Body Systems in Thermal Equilibrium
Álvaro M. Alhambra
PRX Quantum 4, 040201 (2023) – Published 30 November 2023

A pedagogical guide to understand important aspects of the physics and complexity of quantum many-body systems, focusing on short-range interactions and thermal equilibrium.

Hyperfine Spectroscopy of Isotopically Engineered Group-IV Color Centers in Diamond
Isaac B.W. Harris, Cathryn P. Michaels, Kevin C. Chen, Ryan A. Parker, Michael Titze, Jesús Arjona Martínez, Madison Sutula, Ian R. Christen, Alexander M. Stramma, William Roth, Carola M. Purser, Martin Hayhurst Appel, Chao Li, Matthew E. Trusheim, Nicola L. Palmer, Matthew L. Markham, Edward S. Bielejec, Mete Atatüre, and Dirk Englund
PRX Quantum 4, 040301 (2023) – Published 2 October 2023

First-principle calculations and experimental validation show that color centers in diamond exhibit large hyperfine coupling, making them promising candidates to build quantum registers.

Variational Quantum Dynamics of Two-Dimensional Rotor Models
Matija Medvidović and Dries Sels
PRX Quantum 4, 040302 (2023) – Published 4 October 2023

Classical variational methods are used to simulate the dynamics of two-dimensional quantum models with continuous degrees of freedom using neural networks, pushing the limits of classical computation in simulating these systems.

Fault-Tolerant Quantum Simulation of Materials Using Bloch Orbitals
Nicholas C. Rubin, Dominic W. Berry, Fionn D. Malone, Alec F. White, Tanuj Khattar, A. Eugene DePrince, III, Sabrina Sicolo, Michael Küehn, Michael Kaicher, Joonho Lee, and Ryan Babbush
PRX Quantum 4, 040303 (2023) – Published 6 October 2023

An improvement and detailed accounting of the fault-tolerant resources required for ab initio simulation of periodic systems provides context for quantum computation in materials science.

Thermal Recall: Memory-Assisted Markovian Thermal Processes
Jakub Czartowski, A. de Oliveira Junior, and Kamil Korzekwa
PRX Quantum 4, 040304 (2023) – Published 6 October 2023

A novel resource-theoretic framework is developed to bridge the gap between thermodynamic processes with and without memory effects.

Optimal Protocols for Quantum Metrology with Noisy Measurements
Sisi Zhou, Spyridon Michalakis, and Tuvia Gefen
PRX Quantum 4, 040305 (2023) – Published 9 October 2023

Preprocessing protocols for quantum control are optimized using Fisher information to set ultimate precision bounds for noisy measurements of quantum states.

Finite-Size Security for Discrete-Modulated Continuous-Variable Quantum Key Distribution Protocols
Florian Kanitschar, Ian George, Jie Lin, Twesh Upadhyaya, and Norbert Lütkenhaus
PRX Quantum 4, 040306 (2023) – Published 10 October 2023

Discrete-modulated continuous-variable quantum key distribution is provably secure under experimentally viable conditions in the finite-key regime against collective i.i.d. attacks.

Admissible Causal Structures and Correlations
Eleftherios-Ermis Tselentis and Ämin Baumeler
PRX Quantum 4, 040307 (2023) – Published 11 October 2023

Local quantum theory is found to impose novel limitations on causal structures and correlations.

State-Insensitive Trapping of Alkaline-Earth Atoms in a Nanofiber-Based Optical Dipole Trap
G. Kestler, K. Ton, D. Filin, C. Cheung, P. Schneeweiss, T. Hoinkes, J. Volz, M.S. Safronova, A. Rauschenbeutel, and J.T. Barreiro
PRX Quantum 4, 040308 (2023) – Published 12 October 2023

Alkaline-earth atoms are trapped with fields from a nanophotonic structure for the first time, with possible applications in quantum sensing and atomtronic-photonic circuits.

Measurement-Induced Phases of Matter Require Feedback
Aaron J. Friedman, Oliver Hart, and Rahul Nandkishore
PRX Quantum 4, 040309 (2023) – Published 13 October 2023

A systematic study of chaotic quantum dynamics with measurements shows that outcome-dependent feedback is needed to observe measurement-induced phases of matter.

Experimental Optical Simulator of Reconfigurable and Complex Quantum Environment
P. Renault, J. Nokkala, G. Roeland, N.Y. Joly, R. Zambrini, S. Maniscalco, J. Piilo, N. Treps, and V. Parigi
PRX Quantum 4, 040310 (2023) – Published 16 October 2023

A continuous-variable optical setup is used to simulate the open-system quantum dynamics with engineered environments, with applications in quantum biology, synchronization, and understanding the quantum-to-classical transition.

Learning Correlated Noise in a 39-Qubit Quantum Processor
Robin Harper and Steven T. Flammia
PRX Quantum 4, 040311 (2023) – Published 17 October 2023

An efficient method for modeling and measuring noise in a quantum device is proposed and experimentally tested, helping to illuminate the effectiveness of error correction against correlated noise.

Singular-Value Statistics of Non-Hermitian Random Matrices and Open Quantum Systems
Kohei Kawabata, Zhenyu Xiao, Tomi Ohtsuki, and Ryuichi Shindou
PRX Quantum 4, 040312 (2023) – Published 18 October 2023

A new method, based on singular values of non-Hermitian matrices, is shown to be able to identify chaos and nonintegrability in open quantum many-body systems.

Featured in Physics
How to Wire a 1000-Qubit Trapped-Ion Quantum Computer
M. Malinowski, D.T.C. Allcock, and C.J. Ballance
PRX Quantum 4, 040313 (2023) – Published 19 October 2023
Physics logo
Synopsis: Efficient Control of Trapped Ions

A concrete proposal for a 1000-qubit trapped-ion quantum processor takes advantage of integrated switching electronics to reduce the wiring complexity without reducing operation fidelity.

Featured in Physics
Quantum Thermometry with Single Molecules in Nanoprobes
V. Esteso, R. Duquennoy, R.C. Ng, M. Colautti, P. Lombardi, G. Arregui, E. Chavez-Angel, C.M. Sotomayor-Torres, P.D. Garcia, M. Hilke, and C. Toninelli
PRX Quantum 4, 040314 (2023) – Published 20 October 2023
Physics logo
Focus: Molecular Thermometer Works Near Absolute Zero

A single-molecule thermometer provides two-dimensional mapping with high spatial and temperature resolution under cryogenic conditions.

Detecting Spin-Bath Polarization with Quantum Quench Phase Shifts of Single Spins in Diamond
Paul C. Jerger, Yu-Xin Wang (王语馨), Mykyta Onizhuk, Benjamin S. Soloway, Michael T. Solomon, Christopher Egerstrom, F. Joseph Heremans, Giulia Galli, Aashish A. Clerk, and David D. Awschalom
PRX Quantum 4, 040315 (2023) – Published 24 October 2023

Measurements of quantum quench phase shifts enable a direct probe of an NV center's nuclear spin-bath polarization, with applications in quantum memories and metrology.

Designing High-Fidelity Zeno Gates for Dissipative Cat Qubits
Ronan Gautier, Mazyar Mirrahimi, and Alain Sarlette
PRX Quantum 4, 040316 (2023) – Published 25 October 2023

A new perspective on cat-qubit gates is introduced, leading to four new gate designs that improve upon the standard Zeno gate and that can increase gate fidelities by an order of magnitude for realistic experimental parameters.

Many-Body Magic Via Pauli-Markov Chains—From Criticality to Gauge Theories
Poetri Sonya Tarabunga, Emanuele Tirrito, Titas Chanda, and Marcello Dalmonte
PRX Quantum 4, 040317 (2023) – Published 26 October 2023

A novel quantum many-body method is developed for measuring magic, a fundamental resource in quantum information protocols.

Quantum Fourier Transform Has Small Entanglement
Jielun Chen (陈捷伦), E.M. Stoudenmire, and Steven R. White
PRX Quantum 4, 040318 (2023) – Published 27 October 2023

Novel results show that the quantum Fourier transform is compatible with area-law entanglement dynamics, opening the way for classical simulations using tensor networks.

Optimizing Resource Efficiencies for Scalable Full-Stack Quantum Computers
Marco Fellous-Asiani, Jing Hao Chai, Yvain Thonnart, Hui Khoon Ng, Robert S. Whitney, and Alexia Auffèves
PRX Quantum 4, 040319 (2023) – Published 30 October 2023

A full-stack approach to the energetics of quantum computers is introduced, allowing one to minimize their energy consumption for a given computational accuracy.

Satellite-Based Quantum Key Distribution in the Presence of Bypass Channels
Masoud Ghalaii, Sima Bahrani, Carlo Liorni, Federico Grasselli, Hermann Kampermann, Lewis Wooltorton, Rupesh Kumar, Stefano Pirandola, Timothy P. Spiller, Alexander Ling, Bruno Huttner, and Mohsen Razavi
PRX Quantum 4, 040320 (2023) – Published 1 November 2023

Spaceborne quantum communication protocols are studied under restrictive eavesdropping scenarios, showing that even simple QKD protocols can offer positive key rates at high channel losses.

Coupler Microwave-Activated Controlled-Phase Gate on Fluxonium Qubits
Ilya A. Simakov, Grigoriy S. Mazhorin, Ilya N. Moskalenko, Nikolay N. Abramov, Alexander A. Grigorev, Dmitry O. Moskalev, Anastasiya A. Pishchimova, Nikita S. Smirnov, Evgeniy V. Zikiy, Ilya A. Rodionov, and Ilya S. Besedin
PRX Quantum 4, 040321 (2023) – Published 3 November 2023

Direct control of the longitudinal coupling between fluxonium qubits and their coupler enables a novel entangling gate.

Linear Optical Logical Bell State Measurements with Optimal Loss-Tolerance Threshold
Paul Hilaire, Yaron Castor, Edwin Barnes, Sophia E. Economou, and Frédéric Grosshans
PRX Quantum 4, 040322 (2023) – Published 6 November 2023

Linear-optical quantum information processing is shown not to intrinsically reduce the loss tolerance performances of quantum error correction.

Quantum Repeater for W States
Jorge Miguel-Ramiro, Ferran Riera-Sàbat, and Wolfgang Dür
PRX Quantum 4, 040323 (2023) – Published 8 November 2023

A quantum repeater protocol that distributes three-qubit W states over arbitrary distances with polylogarithmic overhead is introduced.

Time-Dependent Hamiltonian Reconstruction Using Continuous Weak Measurements
Karthik Siva, Gerwin Koolstra, John Steinmetz, William P. Livingston, Debmalya Das, L. Chen, J.M. Kreikebaum, N.J. Stevenson, C. Jünger, D.I. Santiago, I. Siddiqi, and A.N. Jordan
PRX Quantum 4, 040324 (2023) – Published 9 November 2023

Continuous weak measurements enable reconstruction of time-dependent Hamiltonians, enhancing the time resolution of quantum gate errors beyond what is revealed by standard tomographic and benchmarking techniques.

End-To-End Resource Analysis for Quantum Interior-Point Methods and Portfolio Optimization
Alexander M. Dalzell, B. David Clader, Grant Salton, Mario Berta, Cedric Yen-Yu Lin, David A. Bader, Nikitas Stamatopoulos, Martin J. A. Schuetz, Fernando G. S. L. Brandão, Helmut G. Katzgraber, and William J. Zeng
PRX Quantum 4, 040325 (2023) – Published 13 November 2023

A detailed resource analysis of an established quantum algorithm for convex optimization reveals that the practical run times implied by this quantum solution are impractical for problems of interest in finance.

Efficient Sampling of Noisy Shallow Circuits Via Monitored Unraveling
Zihan Cheng and Matteo Ippoliti
PRX Quantum 4, 040326 (2023) – Published 15 November 2023

Building on the insight of unraveling noise channels into optimized measurements, a classical algorithm for sampling noisy random circuits is developed, increasing our understanding of the boundary of "practically hard" quantum computation in real-world noisy settings.

Floquet-Engineered Nonlinearities and Controllable Pair-Hopping Processes: From Optical Kerr Cavities to Correlated Quantum Matter
N. Goldman, O.K. Diessel, L. Barbiero, M. Prüfer, M. Di Liberto, and L. Peralta Gavensky
PRX Quantum 4, 040327 (2023) – Published 17 November 2023

A general construction shows how to design unconventional interaction processes in bosonic systems, providing a route for the exploration of exotic quantum phases of matter.

Shadow Tomography on General Measurement Frames
L. Innocenti, S. Lorenzo, I. Palmisano, F. Albarelli, A. Ferraro, M. Paternostro, and G. M. Palma
PRX Quantum 4, 040328 (2023) – Published 20 November 2023

The interplay between measurements, reconstructed observables, and the estimators used to process measurement outcomes is examined in a framework that connects shadow tomography with the general theory of measurement frames.

Noise-Assisted Digital Quantum Simulation of Open Systems Using Partial Probabilistic Error Cancellation
José D. Guimarães, James Lim, Mikhail I. Vasilevskiy, Susana F. Huelga, and Martin B. Plenio
PRX Quantum 4, 040329 (2023) – Published 21 November 2023

Noise can be used as a computational resource for simulating open quantum systems on NISQ devices.

Simple and Tighter Derivation of Achievability for Classical Communication Over Quantum Channels
Hao-Chung Cheng (鄭皓中)
PRX Quantum 4, 040330 (2023) – Published 22 November 2023

A judicious application of the so-called pretty-good measurement in quantum coding considerably simplifies the derivation of one-shot achievability, sharpening many existing quantum information-processing protocols.

Clifford Group and Unitary Designs under Symmetry
Yosuke Mitsuhashi and Nobuyuki Yoshioka
PRX Quantum 4, 040331 (2023) – Published 27 November 2023

The concept of unitary designs is extended to scenarios involving symmetry, which can be applied in the contexts of randomized benchmarking and many-body simulations.

Ultrafast Entanglement Dynamics in Monitored Quantum Circuits
Shengqi Sang, Zhi Li, Timothy H. Hsieh, and Beni Yoshida
PRX Quantum 4, 040332 (2023) – Published 28 November 2023

Quantum correlation and information spread superlinearly with time in quantum dynamics subject to repeated measurements.

Qudit Entanglers Using Quantum Optimal Control
Sivaprasad Omanakuttan, Anupam Mitra, Eric J. Meier, Michael J. Martin, and Ivan H. Deutsch
PRX Quantum 4, 040333 (2023) – Published 29 November 2023

Novel techniques based on Lie group and algebraic quantum optimal control are employed in a new protocol to implement entangling universal logic gates on qudits.

Erratum: Role of Quantum Coherence in Thermodynamics [PRX Quantum 3, 040323 (2022)]
Gilad Gour
PRX Quantum 4, 040901 (2023) – Published 2 October 2023

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