Browse Issues:

High-Fidelity Measurement of Qubits Encoded in Multilevel Superconducting Circuits

Salvatore S. Elder, Christopher S. Wang, Philip Reinhold, Connor T. Hann, Kevin S. Chou, Brian J. Lester, Serge Rosenblum, Luigi Frunzio, Liang Jiang, and Robert J. Schoelkopf

Phys. Rev. X 10, 011001 (2020) - Published 2 January, 2020

By using redundant measurements and multiphoton states, a new approach to encoding and reading quantum bits drastically reduces errors that typically lead to a loss of information.

Spectroscopic Visualization of a Robust Electronic Response of Semiconducting Nanowires to Deposition of Superconducting Islands

Jonathan Reiner, Abhay Kumar Nayak, Amit Tulchinsky, Aviram Steinbok, Tom Koren, Noam Morali, Rajib Batabyal, Jung-Hyun Kang, Nurit Avraham, Yuval Oreg, Hadas Shtrikman, and Haim Beidenkopf

Phys. Rev. X 10, 011002 (2020) - Published 3 January, 2020

The electronic behavior of indium arsenide nanowires is barely affected by the presence of superconducting aluminum electrodes, an insight that could be useful for designing robust quantum-based technologies.

Spatiotemporal Mapping of a Photocurrent Vortex in Monolayer MoS2 Using Diamond Quantum Sensors

Brian B. Zhou, Paul C. Jerger, Kan-Heng Lee, Masaya Fukami, Fauzia Mujid, Jiwoong Park, and David D. Awschalom

Phys. Rev. X 10, 011003 (2020) - Published 6 January, 2020

Experiments reveal the path traced by light-induced electric currents in a monolayer semiconductor by using nitrogen-vacancy centers in diamond to sense magnetic fields from those currents.

Increasing the Representation Accuracy of Quantum Simulations of Chemistry without Extra Quantum Resources

Tyler Takeshita, Nicholas C. Rubin, Zhang Jiang, Eunseok Lee, Ryan Babbush, and Jarrod R. McClean

Phys. Rev. X 10, 011004 (2020) - Published 7 January, 2020

The right combination of quantum and classical computations allows for accurate quantum chemistry simulations using surprisingly few qubits.

Classical Dimers on Penrose Tilings

Felix Flicker, Steven H. Simon, and S. A. Parameswaran

Phys. Rev. X 10, 011005 (2020) - Published 8 January, 2020

A new analysis shows that the edges of a Penrose tiling cannot be colored such that every vertex connects to precisely one colored edge, an insight with implications for the study of topological order.

Using a Recurrent Neural Network to Reconstruct Quantum Dynamics of a Superconducting Qubit from Physical Observations

E. Flurin, L. S. Martin, S. Hacohen-Gourgy, and I. Siddiqi

Phys. Rev. X 10, 011006 (2020) - Published 9 January, 2020

A neutral network shows the ability to infer complex quantum behavior of a superconducting qubit without any prior knowledge about the rules of quantum physics.

Partial Up-Up-Down Order with the Continuously Distributed Order Parameter in the Triangular Antiferromagnet TmMgGaO4

Yuesheng Li, Sebastian Bachus, Hao Deng, Wolfgang Schmidt, Henrik Thoma, Vladimir Hutanu, Yoshifumi Tokiwa, Alexander A. Tsirlin, and Philipp Gegenwart

Phys. Rev. X 10, 011007 (2020) - Published 10 January, 2020

An investigation of the low-temperature magnetism of TmMgGaO4, a recently synthesized “triangular-lattice Ising antiferromagnet,” reveals an unconventional magnetic architecture that might arise in other similar rare-earth magnets.

Ab Initio Few-Mode Theory for Quantum Potential Scattering Problems

Dominik Lentrodt and Jörg Evers

Phys. Rev. X 10, 011008 (2020) - Published 13 January, 2020

Few-mode models boil down complex quantum dynamics to a few parameters. New work expands such models to a full-fledged theory, allowing researchers to predict behavior in more extreme regimes.

Conformal Quasicrystals and Holography

Latham Boyle, Madeline Dickens, and Felix Flicker

Phys. Rev. X 10, 011009 (2020) - Published 14 January, 2020

The boundary of a discrete spacetime is itself a discrete structure now dubbed a conformal quasicrystal, a fundamental new insight into ideas from holography that attempt to reconcile the conflict between general relativity and quantum physics.

Real-Time Observation of Stacking Faults in Gold Shock Compressed to 150 GPa

Surinder M. Sharma, Stefan J. Turneaure, J. M. Winey, P. A. Rigg, N. Sinclair, Xiaoming Wang, Y. Toyoda, and Y. M. Gupta

Phys. Rev. X 10, 011010 (2020) - Published 15 January, 2020

A new experimental approach reveals, for the first time, the formation of microstructural defects in gold when shock compressed to high pressure, a critical insight to understanding shocked states of materials.

Observation of Three-Photon Spontaneous Parametric Down-Conversion in a Superconducting Parametric Cavity

C. W. Sandbo Chang, Carlos Sabín, P. Forn-Díaz, Fernando Quijandría, A. M. Vadiraj, I. Nsanzineza, G. Johansson, and C. M. Wilson

Phys. Rev. X 10, 011011 (2020) - Published 16 January, 2020

A long-sought three-photon version of spontaneous parametric down-conversion, a common technique for entangled photon generation, lays the groundwork for expanded investigations into novel types of quantum entanglements and quantum computing resources.

Coexistence of Surface and Bulk Ferromagnetism Mimics Skyrmion Hall Effect in a Topological Insulator

K. M. Fijalkowski, M. Hartl, M. Winnerlein, P. Mandal, S. Schreyeck, K. Brunner, C. Gould, and L. W. Molenkamp

Phys. Rev. X 10, 011012 (2020) - Published 17 January, 2020

Experiments reveal that two ferromagnetic states coexist in (V,Bi,Sb)2Te3, a prototypical quantum anomalous Hall effect system, which could provide insight into this material’s unusual magnetic behavior.

Keeping It Together: Interleaved Kirigami Extension Assembly

Xinyu Wang, Simon D. Guest, and Randall D. Kamien

Phys. Rev. X 10, 011013 (2020) - Published 21 January, 2020

Drawing inspiration from kirigami, the art of paper folding and cutting, experiments show how to make lightweight, foldable structures that can support thousands of times their own weight.

Quantum-Assisted Measurement of Atomic Diamagnetism

Yaakov Y. Fein, Armin Shayeghi, Lukas Mairhofer, Filip Kiałka, Philipp Rieser, Philipp Geyer, Stefan Gerlich, and Markus Arndt

Phys. Rev. X 10, 011014 (2020) - Published 22 January, 2020

An atom interferometer reaches a high enough sensitivity to measure the ground-state diamagnetism of single atoms.

Nonlinear Dynamics of Human Aortas for Material Characterization

Marco Amabili, Prabakaran Balasubramanian, Isabella Bozzo, Ivan D. Breslavsky, Giovanni Ferrari, Giulio Franchini, Francesco Giovanniello, and Chloé Pogue

Phys. Rev. X 10, 011015 (2020) - Published 23 January, 2020

Younger aortas can expand 5 times more than older ones as fluid pumps through them, a finding that could help to design more successful aortic prostheses.

Tractions and Stress Fibers Control Cell Shape and Rearrangements in Collective Cell Migration

Aashrith Saraswathibhatla and Jacob Notbohm

Phys. Rev. X 10, 011016 (2020) - Published 23 January, 2020

Traction between a living cell and its underlying surface controls the cell’s shape and motion, revealing one of the dominant factors underlying cell migration.

Nonergodic Delocalized States for Efficient Population Transfer within a Narrow Band of the Energy Landscape

Vadim N. Smelyanskiy, Kostyantyn Kechedzhi, Sergio Boixo, Sergei V. Isakov, Hartmut Neven, and Boris Altshuler

Phys. Rev. X 10, 011017 (2020) - Published 24 January, 2020

An analysis of a quantum model of a spin glass shows how to efficiently find its low-energy configurations, which can be applied to the development of efficient quantum computing algorithms.

Single-Atom Quantum Probes for Ultracold Gases Boosted by Nonequilibrium Spin Dynamics

Quentin Bouton, Jens Nettersheim, Daniel Adam, Felix Schmidt, Daniel Mayer, Tobias Lausch, Eberhard Tiemann, and Artur Widera

Phys. Rev. X 10, 011018 (2020) - Published 27 January, 2020

The temperature of an ultracold gas of rubidium atoms is measured precisely using internal quantum states of a single cesium atom.

Generalization of Fourier’s Law into Viscous Heat Equations

Michele Simoncelli, Nicola Marzari, and Andrea Cepellotti

Phys. Rev. X 10, 011019 (2020) - Published 28 January, 2020

Two novel differential equations for heat conduction in crystals generalize Fourier’s law and explain why heat propagation can become fluidlike, rather than diffusive, in electronic or phononic devices.

Extracting the Field Theory Description of a Quantum Many-Body System from Experimental Data

Torsten V. Zache, Thomas Schweigler, Sebastian Erne, Jörg Schmiedmayer, and Jürgen Berges

Phys. Rev. X 10, 011020 (2020) - Published 29 January, 2020

Quantum simulators can help researchers extract the key parameters of a quantum field theory from experiments.

Pitching Single-Focus Confocal Data Analysis One Photon at a Time with Bayesian Nonparametrics

Meysam Tavakoli, Sina Jazani, Ioannis Sgouralis, Omer M. Shafraz, Sanjeevi Sivasankar, Bryan Donaphon, Marcia Levitus, and Steve Pressé

Phys. Rev. X 10, 011021 (2020) - Published 30 January, 2020

With the help of novel mathematical tools, the arrival of individual photons at a detector can reveal dynamics of single molecules.

Topological and Subsystem Codes on Low-Degree Graphs with Flag Qubits

Christopher Chamberland, Guanyu Zhu, Theodore J. Yoder, Jared B. Hertzberg, and Andrew W. Cross

Phys. Rev. X 10, 011022 (2020) - Published 31 January, 2020

A new proposed family of quantum error correcting codes and a scalable and efficient flag-based decoding scheme are suitable for implementation in superconducting qubit architectures and offer competitive performance to other error-correction schemes.

Synchronization to Big Data: Nudging the Navier-Stokes Equations for Data Assimilation of Turbulent Flows

Patricio Clark Di Leoni, Andrea Mazzino, and Luca Biferale

Phys. Rev. X 10, 011023 (2020) - Published 3 February, 2020

A technique for analyzing fluid flows can recover small-scale motions and patterns in a turbulent fluid that were not present in the data.

Similarities and Differences between LaNiO2 and CaCuO2 and Implications for Superconductivity

A. S. Botana and M. R. Norman

Phys. Rev. X 10, 011024 (2020) - Published 4 February, 2020

Calculations of the electronic structure of NdNiO2, recently found to be superconducting, reveal important similarities and differences to cuprates, which may shed light on the origin of cuprate high-temperature superconductivity.

Non-Abelian Symmetries and Disorder: A Broad Nonergodic Regime and Anomalous Thermalization

Ivan V. Protopopov, Rajat K. Panda, Tommaso Parolini, Antonello Scardicchio, Eugene Demler, and Dmitry A. Abanin

Phys. Rev. X 10, 011025 (2020) - Published 5 February, 2020

A mathematical analysis reveals a new class of quantum systems that, because of specific symmetries, fail to reach thermal equilibrium, thus broadening the family of nonthermalizing behaviors.

Modular Arithmetic with Nodal Lines: Drumhead Surface States in ZrSiTe

Lukas Muechler, Andreas Topp, Raquel Queiroz, Maxim Krivenkov, Andrei Varykhalov, Jennifer Cano, Christian R. Ast, and Leslie M. Schoop

Phys. Rev. X 10, 011026 (2020) - Published 6 February, 2020

Experiments reveal so-called drumhead surface states in a well-studied family of nodal semimetals, unraveling the complex interplay between different types of surface states in a complex class of materials.

Full-Field Terahertz Imaging at Kilohertz Frame Rates Using Atomic Vapor

Lucy A. Downes, Andrew R. MacKellar, Daniel J. Whiting, Cyril Bourgenot, Charles S. Adams, and Kevin J. Weatherill

Phys. Rev. X 10, 011027 (2020) - Published 7 February, 2020

A new technique produces high-speed videos with terahertz (far infrared) radiation, which could be useful for nondestructive testing.

Rheoacoustic Gels: Tuning Mechanical and Flow Properties of Colloidal Gels with Ultrasonic Vibrations

Thomas Gibaud, Noémie Dagès, Pierre Lidon, Guillaume Jung, L. Christian Ahouré, Michael Sztucki, Arnaud Poulesquen, Nicolas Hengl, Frédéric Pignon, and Sébastien Manneville

Phys. Rev. X 10, 011028 (2020) - Published 10 February, 2020

Ultrasonic vibrations can control the elasticity and yield stress of colloidal gels, providing a way to tune the properties of these materials in real time.

Direct Measurement of the Impact of Teaching Experimentation in Physics Labs

Emily M. Smith, Martin M. Stein, Cole Walsh, and N. G. Holmes

Phys. Rev. X 10, 011029 (2020) - Published 10 February, 2020

Traditional physics labs can have a negative impact on student learning, whereas nontraditional inquiry-based labs improve performance and engagement while maintaining exam scores.

Parametric Instabilities of Interacting Bosons in Periodically Driven 1D Optical Lattices

K. Wintersperger, M. Bukov, J. Näger, S. Lellouch, E. Demler, U. Schneider, I. Bloch, N. Goldman, and M. Aidelsburger

Phys. Rev. X 10, 011030 (2020) - Published 11 February, 2020

The appearance of collective modes, known as parametric instabilities, shortly after shaking an ensemble of ultracold bosons signals their importance for the stability of periodically driven bosonic systems.

Mapping and Modeling the Nanomechanics of Bare and Protein-Coated Lipid Nanotubes

Guillaume Lamour, Antoine Allard, Juan Pelta, Sid Labdi, Martin Lenz, and Clément Campillo

Phys. Rev. X 10, 011031 (2020) - Published 11 February, 2020

Atomic force microscopy reveals the mechanics and morphology of biological nanotubes found in living cells, establishing a new platform for studying fundamental cellular processes.

Spatial Patterns Emerging from a Stochastic Process Near Criticality

Fabio Peruzzo, Mauro Mobilia, and Sandro Azaele

Phys. Rev. X 10, 011032 (2020) - Published 12 February, 2020

Living systems operate near a critical point in their parameter space, which can allow researchers to predict spatial patterns that arise in a population of dynamic individuals.

From Spinon Band Topology to the Symmetry Quantum Numbers of Monopoles in Dirac Spin Liquids

Xue-Yang Song, Yin-Chen He, Ashvin Vishwanath, and Chong Wang

Phys. Rev. X 10, 011033 (2020) - Published 12 February, 2020

A new analysis reveals symmetry properties of monopoles in Dirac spin liquids, resolving a long-standing problem in the stability of this exotic state.

Spin-Orbital-Intertwined Nematic State in FeSe

J. Li, B. Lei, D. Zhao, L. P. Nie, D. W. Song, L. X. Zheng, S. J. Li, B. L. Kang, X. G. Luo, T. Wu, and X. H. Chen

Phys. Rev. X 10, 011034 (2020) - Published 13 February, 2020

A new quantum state of matter in an FeSe superconductor arises from the interplay between electron correlation and spin-orbit coupling, cementing this material family as a solid platform for exploring connections between these two fundamental interactions.

Nematic State in CeAuSb2

S. Seo, Xiaoyu Wang, S. M. Thomas, M. C. Rahn, D. Carmo, F. Ronning, E. D. Bauer, R. D. dos Reis, M. Janoschek, J. D. Thompson, R. M. Fernandes, and P. F. S. Rosa

Phys. Rev. X 10, 011035 (2020) - Published 13 February, 2020

The discovery of a vestigial nematic electronic phase in CeAuSb2 without superconductivity reveals the complex interplay between this phase and stripe magnetic order and how this interplay relates to high-temperature superconductivity.

Observation of a Charge-Neutral Muon-Polaron Complex in Antiferromagnetic Cr2O3

M. H. Dehn, J. K. Shenton, S. Holenstein, Q. N. Meier, D. J. Arseneau, D. L. Cortie, B. Hitti, A. C. Y. Fang, W. A. MacFarlane, R. M. L. McFadden, G. D. Morris, Z. Salman, H. Luetkens, N. A. Spaldin, M. Fechner, and R. F. Kiefl

Phys. Rev. X 10, 011036 (2020) - Published 14 February, 2020

Experiments reveal muon-polaron complexes in Cr2O3. Similar entities may exist in many magnetic insulators and semiconductors, where they can be used as proxies to understand the impact of hydrogen impurities.

Optimal Renormalization Group Transformation from Information Theory

Patrick M. Lenggenhager, Doruk Efe Gökmen, Zohar Ringel, Sebastian D. Huber, and Maciej Koch-Janusz

Phys. Rev. X 10, 011037 (2020) - Published 14 February, 2020

A new approach to developing real-space renormalization group methods paves the way for using machine learning to derive large-scale behavior of physical systems from microscopic models.

Experimental Demonstration of Quantum Fully Homomorphic Encryption with Application in a Two-Party Secure Protocol

W. K. Tham, Hugo Ferretti, Kent Bonsma-Fisher, Aharon Brodutch, Barry C. Sanders, Aephraim M. Steinberg, and Stacey Jeffery

Phys. Rev. X 10, 011038 (2020) - Published 18 February, 2020

An experimental implementation of fully homomorphic encryption is the first to be unencumbered by limitations that prevented previous approaches from being used in a wide variety of cryptographic applications.

Nonequilibrium Fixed Points of Coupled Ising Models

Jeremy T. Young, Alexey V. Gorshkov, Michael Foss-Feig, and Mohammad F. Maghrebi

Phys. Rev. X 10, 011039 (2020) - Published 19 February, 2020

Exotic nonequilibrium behavior arises near the multicritical points of an open, driven quantum system.

Accelerating Polaritons with External Electric and Magnetic Fields

T. Chervy, P. Knüppel, H. Abbaspour, M. Lupatini, S. Fält, W. Wegscheider, M. Kroner, and A. Imamoǧlu

Phys. Rev. X 10, 011040 (2020) - Published 19 February, 2020

Combining photons with electronic excitations creates a new kind of quasiparticle that can be manipulated with electric or magnetic fields.

Direct Comparison of Many-Body Methods for Realistic Electronic Hamiltonians

Kiel T. Williams, Yuan Yao, Jia Li, Li Chen, Hao Shi, Mario Motta, Chunyao Niu, Ushnish Ray, Sheng Guo, Robert J. Anderson, Junhao Li, Lan Nguyen Tran, Chia-Nan Yeh, Bastien Mussard, Sandeep Sharma, Fabien Bruneval, Mark van Schilfgaarde, George H. Booth, Garnet Kin-Lic Chan, Shiwei Zhang, Emanuel Gull, Dominika Zgid, Andrew Millis, Cyrus J. Umrigar, and Lucas K. Wagner (Simons Collaboration on the Many-Electron Problem)

Phys. Rev. X 10, 011041 (2020) - Published 20 February, 2020

Tests of over 20 techniques for approximating many-body electron systems reveal which approaches are best suited to accurate modeling of these systems.

Subdiffusion and Heat Transport in a Tilted Two-Dimensional Fermi-Hubbard System

Elmer Guardado-Sanchez, Alan Morningstar, Benjamin M. Spar, Peter T. Brown, David A. Huse, and Waseem S. Bakr

Phys. Rev. X 10, 011042 (2020) - Published 21 February, 2020

Experiments show that a particular quantum many-body system thermalizes surprisingly slowly, and a hydrodynamic model of the system reveals a crucial underlying link between the transport of both mass and heat.

Long-Range Prethermal Phases of Nonequilibrium Matter

Francisco Machado, Dominic V. Else, Gregory D. Kahanamoku-Meyer, Chetan Nayak, and Norman Y. Yao

Phys. Rev. X 10, 011043 (2020) - Published 21 February, 2020

The existence of prethermal phases of matter in long-range interacting systems is remarkably robust, opening the door to the experimental realization of a novel, disorder-free, prethermal discrete time crystal in 1D.

Critical Switching in Globally Attractive Chimeras

Yuanzhao Zhang, Zachary G. Nicolaou, Joseph D. Hart, Rajarshi Roy, and Adilson E. Motter

Phys. Rev. X 10, 011044 (2020) - Published 24 February, 2020

Newly discovered stochastic switching in networks exhibits anomalous scaling and extreme sensitivity to noise.

Fast High-Fidelity Quantum Nondemolition Qubit Readout via a Nonperturbative Cross-Kerr Coupling

R. Dassonneville, T. Ramos, V. Milchakov, L. Planat, É. Dumur, F. Foroughi, J. Puertas, S. Leger, K. Bharadwaj, J. Delaforce, C. Naud, W. Hasch-Guichard, J. J. García-Ripoll, N. Roch, and O. Buisson

Phys. Rev. X 10, 011045 (2020) - Published 25 February, 2020

A new qubit readout scheme preserves quantum state probabilities while maximizing fidelity with a fast readout time, thus providing a robust measurement method for a new generation of superconducting quantum processors.

Parity Detection of Propagating Microwave Fields

Jean-Claude Besse, Simone Gasparinetti, Michele C. Collodo, Theo Walter, Ants Remm, Jonas Krause, Christopher Eichler, and Andreas Wallraff

Phys. Rev. X 10, 011046 (2020) - Published 26 February, 2020

An experiment that can distinguish between an even or odd number of photons in a microwave pulse could lead to a versatile tool for identifying errors in quantum communication channels.

Ergodicity Breaking Arising from Hilbert Space Fragmentation in Dipole-Conserving Hamiltonians

Pablo Sala, Tibor Rakovszky, Ruben Verresen, Michael Knap, and Frank Pollmann

Phys. Rev. X 10, 011047 (2020) - Published 26 February, 2020

A new mathematical framework provides a theoretical toolkit for exploring quantum many-body system that fail to thermalize.

Topological Insulator State and Collapse of the Quantum Hall Effect in a Three-Dimensional Dirac Semimetal Heterojunction

David A. Kealhofer, Luca Galletti, Timo Schumann, Alexey Suslov, and Susanne Stemmer

Phys. Rev. X 10, 011050 (2020) - Published 27 February, 2020

A topological insulator state emerges in thin films of a 3D Dirac semimetal, offering a new high-mobility platform for probing and manipulating topological surface states and their phenomena.

Two-Dimensional Impulsively Stimulated Resonant Raman Spectroscopy of Molecular Excited States

Giuseppe Fumero, Christoph Schnedermann, Giovanni Batignani, Torsten Wende, Matz Liebel, Giovanni Bassolino, Carino Ferrante, Shaul Mukamel, Philipp Kukura, and Tullio Scopigno

Phys. Rev. X 10, 011051 (2020) - Published 28 February, 2020

A spectroscopic technique reveals the interplay between vibrational and electronic degrees of freedom in molecules undergoing ultrafast physical and chemical changes.

Topological Elasticity of Flexible Structures

Adrien Saremi and Zeb Rocklin

Phys. Rev. X 10, 011052 (2020) - Published 2 March, 2020

A new elastic theory describes how the microstructures of certain materials can lead to large, abrupt deformations whose origin cannot be explained with standard models.

Pump Frequency Resonances for Light-Induced Incipient Superconductivity in YBa2Cu3O6.5

B. Liu, M. Först, M. Fechner, D. Nicoletti, J. Porras, T. Loew, B. Keimer, and A. Cavalleri

Phys. Rev. X 10, 011053 (2020) - Published 3 March, 2020

Transient light-induced superconductivity in a high-temperature copper oxide material arises only when certain vibration and electronic modes are excited. This observation shines a light on the underlying mechanism for this phenomenon.

Current Operators in Bethe Ansatz and Generalized Hydrodynamics: An Exact Quantum-Classical Correspondence

Márton Borsi, Balázs Pozsgay, and Levente Pristyák

Phys. Rev. X 10, 011054 (2020) - Published 3 March, 2020

In certain 1D quantum models, flows of some physical quantities can be computed using classical physics, an insight that could help researchers bridge the divide between the quantum and classical world.

Slow Quantum Thermalization and Many-Body Revivals from Mixed Phase Space

A. A. Michailidis, C. J. Turner, Z. Papić, D. A. Abanin, and M. Serbyn

Phys. Rev. X 10, 011055 (2020) - Published 4 March, 2020

A new mathematical tool provides a way to identify slowly thermalizing states in strongly interacting quantum systems.

Photoinduced Nonequilibrium Response in Underdoped YBa2Cu3O6+x Probed by Time-Resolved Terahertz Spectroscopy

S. J. Zhang, Z. X. Wang, H. Xiang, X. Yao, Q. M. Liu, L. Y. Shi, T. Lin, T. Dong, D. Wu, and N. L. Wang

Phys. Rev. X 10, 011056 (2020) - Published 4 March, 2020

Recent claims of light-induced room-temperature superconductivity in YBa2Cu3O6+x can be explained instead by the generation of quasiparticles, and the observed optical signatures do not require phonon excitation as reported.

Marvels and Pitfalls of the Langevin Algorithm in Noisy High-Dimensional Inference

Stefano Sarao Mannelli, Giulio Biroli, Chiara Cammarota, Florent Krzakala, Pierfrancesco Urbani, and Lenka Zdeborová

Phys. Rev. X 10, 011057 (2020) - Published 5 March, 2020

A tool for benchmarking one of the algorithms most commonly used in machine-learning provides insight into its performance and could lead to a better theoretical understanding of how similar algorithms work.

Quantum Computing with Rotation-Symmetric Bosonic Codes

Arne L. Grimsmo, Joshua Combes, and Ben Q. Baragiola

Phys. Rev. X 10, 011058 (2020) - Published 6 March, 2020

A unifying framework for quantum error-correcting codes based on collections of bosons allows for the discovery of new codes that provide robust error correction in line with fundamental theoretical limits.

Mode-Locked Topological Insulator Laser Utilizing Synthetic Dimensions

Zhaoju Yang, Eran Lustig, Gal Harari, Yonatan Plotnik, Yaakov Lumer, Miguel A. Bandres, and Mordechai Segev

Phys. Rev. X 10, 011059 (2020) - Published 9 March, 2020

The unique properties of topological physics allow for the design of an array of synchronized, mutually locked semiconductor laser resonators, which could be used as a source of high-power mode-locked laser pulses.

Coherence of a Driven Electron Spin Qubit Actively Decoupled from Quasistatic Noise

Takashi Nakajima, Akito Noiri, Kento Kawasaki, Jun Yoneda, Peter Stano, Shinichi Amaha, Tomohiro Otsuka, Kenta Takeda, Matthieu R. Delbecq, Giles Allison, Arne Ludwig, Andreas D. Wieck, Daniel Loss, and Seigo Tarucha

Phys. Rev. X 10, 011060 (2020) - Published 10 March, 2020

A feedback control technique suppresses low-frequency noise in an electron-spin qubit, boosting coherence time and control fidelity.

Hard X Rays from Laser-Wakefield Accelerators in Density Tailored Plasmas

Michaela Kozlova, Igor Andriyash, Julien Gautier, Stephane Sebban, Slava Smartsev, Noemie Jourdain, Uddhab Chaulagain, Yasmina Azamoum, Amar Tafzi, Jean-Philippe Goddet, Kosta Oubrerie, Cedric Thaury, Antoine Rousse, and Kim Ta Phuoc

Phys. Rev. X 10, 011061 (2020) - Published 11 March, 2020

The output of a compact x-ray source based on laser-generated plasma can be boosted by tailoring the spatial structure of the plasma.

Dirac Magnons in a Honeycomb Lattice Quantum XY Magnet CoTiO3

Bo Yuan, Ilia Khait, Guo-Jiun Shu, F. C. Chou, M. B. Stone, J. P. Clancy, Arun Paramekanti, and Young-June Kim

Phys. Rev. X 10, 011062 (2020) - Published 12 March, 2020

Experiments show that magnons in CoTiO3 have a similar energy-momentum relation to electrons in graphene, setting up CoTiO3 as a good system in which to study interactions between so-called Dirac bosons.

Tesla-Scale Terahertz Magnetic Impulses

Shawn Sederberg, Fanqi Kong, and Paul B. Corkum

Phys. Rev. X 10, 011063 (2020) - Published 13 March, 2020

Simulations suggest that a relatively simple laser technique could produce femtosecond magnetic-field pulses, which currently are only available at a few major lab facilities.

Observation of Anomalous Non-Ohmic Transport in Current-Driven Nanostructures

Guanxiong Chen, Ryan Freeman, Andrei Zholud, and Sergei Urazhdin

Phys. Rev. X 10, 011064 (2020) - Published 16 March, 2020

Microstructure response to electrical current cannot be described as Joule heating, which warrants a reexamination of many observations of current-induced heating and suggests a new way to study the electron-phonon interaction.

Characterizing Multiphoton Excitation Using Time-Resolved X-ray Scattering

Philip H. Bucksbaum, Matthew R. Ware, Adi Natan, James P. Cryan, and James M. Glownia

Phys. Rev. X 10, 011065 (2020) - Published 17 March, 2020

Using femtosecond x-ray scattering, experiments reveal the ultrafast and ultrasmall motion of molecular iodine in response to intense laser radiation, showing that femtosecond x rays are a powerful tool for studying laser-matter interactions.

Universal Thermodynamic Bounds on Nonequilibrium Response with Biochemical Applications

Jeremy A. Owen, Todd R. Gingrich, and Jordan M. Horowitz

Phys. Rev. X 10, 011066 (2020) - Published 18 March, 2020

A collection of thermodynamic equalities and inequalities valid far from equilibrium constrain the response of nonequilibrium systems in terms of a driving force, offering insight into the energetic requirements of common biochemical processes.

Cascaded Multicycle Terahertz-Driven Ultrafast Electron Acceleration and Manipulation

Dongfang Zhang, Moein Fakhari, Huseyin Cankaya, Anne-Laure Calendron, Nicholas H. Matlis, and Franz X. Kärtner

Phys. Rev. X 10, 011067 (2020) - Published 19 March, 2020

Experiments demonstrate the first realization of multicycle terahertz electron acceleration and terahertz energy recycling, paving the way for a new generation of compact and efficient accelerators.

Nanotribology of Ionic Liquids: Transition to Yielding Response in Nanometric Confinement with Metallic Surfaces

Antoine Lainé, Antoine Niguès, Lydéric Bocquet, and Alessandro Siria

Phys. Rev. X 10, 011068 (2020) - Published 20 March, 2020

Experiments reveal that room-temperature ionic liquids (RTILs) undergo a freezing transition when confined between metallic surfaces, paving the way for on-demand mechanical control of RTILs in lubrication applications.

Deep Quantum Geometry of Matrices

Xizhi Han (韩希之) and Sean A. Hartnoll

Phys. Rev. X 10, 011069 (2020) - Published 23 March, 2020

Neural networks enable an important calculation in a popular approach to unifying quantum theory with general relativity.

Cumulative Merging Percolation and the Epidemic Transition of the Susceptible-Infected-Susceptible Model in Networks

Claudio Castellano and Romualdo Pastor-Satorras

Phys. Rev. X 10, 011070 (2020) - Published 24 March, 2020

During the spread of an epidemic, highly connected individuals can maintain infection throughout the population by reinfecting each other even when not in direct contact.

Nonmodal Plasmonics: Controlling the Forced Optical Response of Nanostructures

Gilad Rosenblatt, Boris Simkhovich, Guy Bartal, and Meir Orenstein

Phys. Rev. X 10, 011071 (2020) - Published 25 March, 2020

Experiments reveal a new family of optical fields that originate at the boundary between a nanostructure and an incident light source, offering new paths for controlling optical behavior in a wide range of technologies.

Variational Method for Image-Based Inference of Internal Stress in Epithelial Tissues

Nicholas Noll, Sebastian J. Streichan, and Boris I. Shraiman

Phys. Rev. X 10, 011072 (2020) - Published 26 March, 2020

A new approach to inferring mechanical stress in living tissue provides a practical and noninvasive tool to experimentalists studying tissue and organ development.

Noise-Induced Synchronization and Antiresonance in Interacting Excitable Systems: Applications to Deep Brain Stimulation in Parkinson’s Disease

Jonathan D. Touboul, Charlotte Piette, Laurent Venance, and G. Bard Ermentrout

Phys. Rev. X 10, 011073 (2020) - Published 27 March, 2020

Large networks of excitable elements exhibit orderly, perfectly synchronized periodic responses to intermediate levels of noise, leading to a new insight regarding deep brain stimulation, a leading therapy for Parkinson’s disease.

Complex Distributions Emerging in Filtering and Compression

G. J. Baxter, R. A. da Costa, S. N. Dorogovtsev, and J. F. F. Mendes

Phys. Rev. X 10, 011074 (2020) - Published 30 March, 2020

A simple filter for marking patterns in a binary sequence produces an output with similar statistics to cooperative systems such as spin glasses and neural networks, providing a potential tool for understanding the statistics in those systems as well.

Magnetic-Field-Induced Quantum Phase Transitions in a van der Waals Magnet

Siwen Li, Zhipeng Ye, Xiangpeng Luo, Gaihua Ye, Hyun Ho Kim, Bowen Yang, Shangjie Tian, Chenghe Li, Hechang Lei, Adam W. Tsen, Kai Sun, Rui He, and Liuyan Zhao

Phys. Rev. X 10, 011075 (2020) - Published 31 March, 2020

Spectroscopic measurements explain why a van der Waals ferromagnet displays different magnetic behavior in its layered and bulk forms.

Erratum: Two-Stage Dynamics of In Vivo Bacteriophage Genome Ejection [Phys. Rev. X 8, 021029 (2018)]

Yi-Ju Chen, David Wu, William Gelbart, Charles M. Knobler, Rob Phillips, and Willem K. Kegel

Phys. Rev. X 10, 019901 (2020) - Published 6 February, 2020

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