Browse Issues:

Superresolution Microscopy of Cold Atoms in an Optical Lattice

Mickey McDonald, Jonathan Trisnadi, Kai-Xuan Yao, and Cheng Chin

Phys. Rev. X 9, 021001 (2019) - Published 1 April, 2019

A new superresolution imaging technique reveals the behavior of cold atoms in an optical lattice with a spatial resolution of 32 nm and moiré patterns that are hugely magnified images of the microscopic atomic density distribution itself.

Nanoscale Atomic Density Microscopy

S. Subhankar, Y. Wang, T-C. Tsui, S. L. Rolston, and J. V. Porto

Phys. Rev. X 9, 021002 (2019) - Published 1 April, 2019

A new high-resolution imaging technique reveals the behavior of individual atoms in an optical lattice with a resolution fifty times better than the conventional diffraction limit.

Localization in Fractonic Random Circuits

Shriya Pai, Michael Pretko, and Rahul M. Nandkishore

Phys. Rev. X 9, 021003 (2019) - Published 3 April, 2019

Random quantum circuits with fractonic charges, which exhibit restricted mobility, fail to thermalize after a long time, thus showing a new mechanism for achieving many-body localization.

Point Defects, Topological Chirality, and Singularity Theory in Cholesteric Liquid-Crystal Droplets

Joseph Pollard, Gregor Posnjak, Simon Čopar, Igor Muševič, and Gareth P. Alexander

Phys. Rev. X 9, 021004 (2019) - Published 8 April, 2019

A study of chiral liquid-crystal droplets shows how defects lead to geometric arrangements similar to atoms in a molecule, and it provides a new mathematical framework for analyzing and designing novel chiral materials.

Classification of 3+1D Bosonic Topological Orders (II): The Case When Some Pointlike Excitations Are Fermions

Tian Lan and Xiao-Gang Wen

Phys. Rev. X 9, 021005 (2019) - Published 10 April, 2019

A new analysis provides a way to classify topological materials with quasiparticles that act as fermions. Combined with earlier work that assumed all quasiparticles to be bosons, this offers a complete classification of all 3D topological materials.

Frictional Rigidity Percolation: A New Universality Class and Its Superuniversal Connections through Minimal Rigidity Proliferation

Kuang Liu, S. Henkes, and J. M. Schwarz

Phys. Rev. X 9, 021006 (2019) - Published 10 April, 2019

Simulations explore how a packed collection of particles gains or loses rigidity. Randomly placed particles exhibit new structures underlying rigidity changes, while strategically placed particles reveal links with known structures not typically associated with rigidity.

Entanglement Structure of Current-Driven Diffusive Fermion Systems

Michael J. Gullans and David A. Huse

Phys. Rev. X 9, 021007 (2019) - Published 11 April, 2019

A theoretical analysis shows how quantum entanglement prevents thermodynamic equilibrium in systems connected to external reservoirs—a key insight for many metallic devices—and points to experiments for exploring this effect.

Joule-Level High-Efficiency Energy Transfer to Subpicosecond Laser Pulses by a Plasma-Based Amplifier

J.-R. Marquès, L. Lancia, T. Gangolf, M. Blecher, S. Bolaños, J. Fuchs, O. Willi, F. Amiranoff, R. L. Berger, M. Chiaramello, S. Weber, and C. Riconda

Phys. Rev. X 9, 021008 (2019) - Published 12 April, 2019

Experiments demonstrate a laser amplification technique capable of high and efficient energy transfer in under a picosecond, an essential step toward the design of next-generation extreme-intensity laser facilities.

Irreversibility in Active Matter Systems: Fluctuation Theorem and Mutual Information

Lennart Dabelow, Stefano Bo, and Ralf Eichhorn

Phys. Rev. X 9, 021009 (2019) - Published 15 April, 2019

A measure of irreversibility in active particle systems—such as a cluster of bacteria or a swarm of nanorobots—could be a useful metric for characterizing the out-of-equilibrium behavior of such systems.

Cage-Net Fracton Models

Abhinav Prem, Sheng-Jie Huang, Hao Song, and Michael Hermele

Phys. Rev. X 9, 021010 (2019) - Published 17 April, 2019

Exactly solvable theoretical models open the door to new kinds of non-Abelian particles in quantum many-body systems.

Benchmarking Gate Fidelities in a Si/SiGe Two-Qubit Device

X. Xue, T. F. Watson, J. Helsen, D. R. Ward, D. E. Savage, M. G. Lagally, S. N. Coppersmith, M. A. Eriksson, S. Wehner, and L. M. K. Vandersypen

Phys. Rev. X 9, 021011 (2019) - Published 18 April, 2019

Two-qubit quantum gates in silicon exhibit 92% fidelity when tested with a new benchmarking protocol, showing both the utility of the protocol and a promising start for developing fault-tolerant quantum computers based on spins in silicon.

Long-Lived and Transient Supersolid Behaviors in Dipolar Quantum Gases

L. Chomaz, D. Petter, P. Ilzhöfer, G. Natale, A. Trautmann, C. Politi, G. Durastante, R. M. W. van Bijnen, A. Patscheider, M. Sohmen, M. J. Mark, and F. Ferlaino

Phys. Rev. X 9, 021012 (2019) - Published 19 April, 2019

Experiments achieve long-lived hallmarks of supersolidity—an exotic phase of matter where superfluidity and crystalline order coexist—via two different techniques, setting the stage for future investigations into the phase’s behavior.

Failure of Nielsen-Ninomiya Theorem and Fragile Topology in Two-Dimensional Systems with Space-Time Inversion Symmetry: Application to Twisted Bilayer Graphene at Magic Angle

Junyeong Ahn, Sungjoon Park, and Bohm-Jung Yang

Phys. Rev. X 9, 021013 (2019) - Published 22 April, 2019

A new theory reveals the topological origin of the mismatch between the number of left- and right-handed Dirac quasiparticles in twisted bilayer graphene, which is a step toward identifying new topological phases of matter.

Normal Form for Renormalization Groups

Archishman Raju, Colin B. Clement, Lorien X. Hayden, Jaron P. Kent-Dobias, Danilo B. Liarte, D. Zeb Rocklin, and James P. Sethna

Phys. Rev. X 9, 021014 (2019) - Published 23 April, 2019

Mathematical methods based on normal form theory allow for the classification of nonlinearities near critical points into families, which could help researchers better understand fractal systems.

Understanding the Formation of PbSe Honeycomb Superstructures by Dynamics Simulations

Giuseppe Soligno and Daniel Vanmaekelbergh

Phys. Rev. X 9, 021015 (2019) - Published 23 April, 2019

Simulations identify the key parameters for directing self-assembly of nanocrystals into square or honeycomb structures, a helpful insight for realizing novel nanomaterials.

Bright On-Demand Source of Antibunched Microwave Photons Based on Inelastic Cooper Pair Tunneling

A. Grimm, F. Blanchet, R. Albert, J. Leppäkangas, S. Jebari, D. Hazra, F. Gustavo, J.-L. Thomassin, E. Dupont-Ferrier, F. Portier, and M. Hofheinz

Phys. Rev. X 9, 021016 (2019) - Published 24 April, 2019

New experiments show how to generate single microwave photons from a Josephson junction without the need for complex control electronics, a key development for quantum metrology and computing.

Anisotropic-Exchange Magnets on a Triangular Lattice: Spin Waves, Accidental Degeneracies, and Dual Spin Liquids

P. A. Maksimov, Zhenyue Zhu, Steven R. White, and A. L. Chernyshev

Phys. Rev. X 9, 021017 (2019) - Published 25 April, 2019

A theoretical overview of the phase diagram of a strongly anisotropic quantum magnet yields evidence for two interrelated spin-liquid regions and provides a framework for studies of a class of quantum materials with strong spin-orbit interactions.

Strain Localization Above the Yielding Point in Cyclically Deformed Glasses

Anshul D. S. Parmar, Saurabh Kumar, and Srikanth Sastry

Phys. Rev. X 9, 021018 (2019) - Published 26 April, 2019

When glass is cyclically deformed back and forth, localized bands of shear strain appear when the glass yields, but they disappear when the deformation is below some critical amount, a useful insight for understanding how solids respond to stress.

Magnetic-Field Learning Using a Single Electronic Spin in Diamond with One-Photon Readout at Room Temperature

R. Santagati, A. A. Gentile, S. Knauer, S. Schmitt, S. Paesani, C. Granade, N. Wiebe, C. Osterkamp, L. P. McGuinness, J. Wang, M. G. Thompson, J. G. Rarity, F. Jelezko, and A. Laing

Phys. Rev. X 9, 021019 (2019) - Published 29 April, 2019

Machine learning enables a nitrogen-vacancy center to track a changing magnetic field with unprecedented sensitivity at room temperature, paving the way for new and practical nanoscale quantum sensing applications.

Ultrafast Spin Dynamics in Photodoped Spin-Orbit Mott Insulator Sr2IrO4

D. Afanasiev, A. Gatilova, D. J. Groenendijk, B. A. Ivanov, M. Gibert, S. Gariglio, J. Mentink, J. Li, N. Dasari, M. Eckstein, Th. Rasing, A. D. Caviglia, and A. V. Kimel

Phys. Rev. X 9, 021020 (2019) - Published 30 April, 2019

Ultrashort laser pulses induce rapid dissolution of magnetic order in a Mott insulator, demonstrating the potential these materials might have in applications requiring ultrafast magnetic dynamics.

Density Wave Probes Cuprate Quantum Phase Transition

Tatiana A. Webb, Michael C. Boyer, Yi Yin, Debanjan Chowdhury, Yang He, Takeshi Kondo, T. Takeuchi, H. Ikuta, Eric W. Hudson, Jennifer E. Hoffman, and Mohammad H. Hamidian

Phys. Rev. X 9, 021021 (2019) - Published 1 May, 2019

Scanning tunneling microscopy of cuprate crystals reveals a change between two distinct types of modulations in the electron density that could shed light on what controls exotic electronic behavior in these high-temperature superconductors.

Monte Carlo Study of Lattice Compact Quantum Electrodynamics with Fermionic Matter: The Parent State of Quantum Phases

Xiao Yan Xu, Yang Qi, Long Zhang, Fakher F. Assaad, Cenke Xu, and Zi Yang Meng

Phys. Rev. X 9, 021022 (2019) - Published 2 May, 2019

Numerical simulations provide the first concrete evidence of 2D U(1) deconfined matter, an exotic phase whose existence has been hotly pursued by both condensed-matter and high-energy physicists.

Squeezed Vacuum Used to Accelerate the Search for a Weak Classical Signal

M. Malnou, D. A. Palken, B. M. Brubaker, Leila R. Vale, Gene C. Hilton, and K. W. Lehnert

Phys. Rev. X 9, 021023 (2019) - Published 3 May, 2019

Squeezed microwave vacuum allows physicists to overcome the quantum limits on cavity-based searches for axionic dark matter, enhancing detection rates twofold in a proof-of-principle experiment.

Free and Bound States of Ions in Ionic Liquids, Conductivity, and Underscreening Paradox

Guang Feng, Ming Chen, Sheng Bi, Zachary A. H. Goodwin, Eugene B. Postnikov, Nikolai Brilliantov, Michael Urbakh, and Alexei A. Kornyshev

Phys. Rev. X 9, 021024 (2019) - Published 6 May, 2019

Simulations show that ions in room-temperature ionic liquids can exist in two states—free and cluster-bound—with easy exchange between them, supporting one hypothesis for how these designer liquids transfer charge.

Quantum FFLO State in Clean Layered Superconductors

Kok Wee Song and Alexei E. Koshelev

Phys. Rev. X 9, 021025 (2019) - Published 7 May, 2019

An updated theoretical framework of a superconducting phase known as the Fulde-Ferrell-Larkin-Ovchinnikov state adds quantum-mechanical considerations that flesh out ideas about how superconductors behave in strong magnetic fields.

Attractive Dipolar Coupling between Stacked Exciton Fluids

Colin Hubert, Yifat Baruchi, Yotam Mazuz-Harpaz, Kobi Cohen, Klaus Biermann, Mikhail Lemeshko, Ken West, Loren Pfeiffer, Ronen Rapaport, and Paulo Santos

Phys. Rev. X 9, 021026 (2019) - Published 8 May, 2019

Experiments reveal attractive dipolar interactions between two exciton fluids for the first time, establishing the anisotropic nature of the dipolar interaction between excitons—a step toward engineering and observing more complex and exotic collective quantum effects.

Prethermalization and Thermalization in Isolated Quantum Systems

Krishnanand Mallayya, Marcos Rigol, and Wojciech De Roeck

Phys. Rev. X 9, 021027 (2019) - Published 9 May, 2019

A new theoretical framework provides a simple yet general mechanism for understanding prethermalization, a common but poorly understood two-step process through which some quantum gases reach thermal equilibrium.

Controlling Spin-Orbit Interactions in Silicon Quantum Dots Using Magnetic Field Direction

Tuomo Tanttu, Bas Hensen, Kok Wai Chan, Chih Hwan Yang, Wister Wei Huang, Michael Fogarty, Fay Hudson, Kohei Itoh, Dimitrie Culcer, Arne Laucht, Andrea Morello, and Andrew Dzurak

Phys. Rev. X 9, 021028 (2019) - Published 10 May, 2019

Experiments show how to control the spin-orbit interaction in a double quantum-dot structure, providing a possible way to produce quantum bits with greater uniformity and improved performance.

Relativistic Interaction of Long-Wavelength Ultrashort Laser Pulses with Nanowires

Zhanna Samsonova, Sebastian Höfer, Vural Kaymak, Skirmantas Ališauskas, Valentina Shumakova, Audrius Pugžlys, Andrius Baltuška, Thomas Siefke, Stefanie Kroker, Alexander Pukhov, Olga Rosmej, Ingo Uschmann, Christian Spielmann, and Daniil Kartashov

Phys. Rev. X 9, 021029 (2019) - Published 14 May, 2019

A novel regime of laser-matter interaction that combines ultrashort mid-infrared laser pulses and silicon nanowires represents a promising way for producing extreme states of matter in the laboratory.

Macroscopic Electron Quantum Coherence in a Solid-State Circuit

H. Duprez, E. Sivre, A. Anthore, A. Aassime, A. Cavanna, A. Ouerghi, U. Gennser, and F. Pierre

Phys. Rev. X 9, 021030 (2019) - Published 14 May, 2019

A nanoengineered circuit provides a way to increase the electron coherence length to 0.25 mm—well above previous studies—thereby setting the stage for quantum manipulation of electrons at the macroscopic scale.

Mixing the Light Spin with Plasmon Orbit by Nonlinear Light-Matter Interaction in Gold

G. Spektor, D. Kilbane, A. K. Mahro, M. Hartelt, E. Prinz, M. Aeschlimann, and M. Orenstein

Phys. Rev. X 9, 021031 (2019) - Published 15 May, 2019

Complex patterns of electron emission from a metal surface are controlled by exotic interactions of two forms of light carrying spin and orbital “rotations,” and they reveal internal quantum transitions within the metal.

Large-Scale Optical Neural Networks Based on Photoelectric Multiplication

Ryan Hamerly, Liane Bernstein, Alexander Sludds, Marin Soljačić, and Dirk Englund

Phys. Rev. X 9, 021032 (2019) - Published 16 May, 2019

A scheme for implementing optical neural networks offers the energy benefits of optical components while being scalable to large systems, promising low-energy processing with order-of-magnitude improvements in network performance.

Entanglement Spreading in a Minimal Model of Maximal Many-Body Quantum Chaos

Bruno Bertini, Pavel Kos, and Tomaž Prosen

Phys. Rev. X 9, 021033 (2019) - Published 17 May, 2019

A mathematical analysis provides the first exact computation of entanglement dynamics in chaotic quantum systems and offers a potential way to describe how entanglement spreads more generally in many-body systems.

Adventure in Topological Phase Transitions in 3+1-D: Non-Abelian Deconfined Quantum Criticalities and a Possible Duality

Zhen Bi and T. Senthil

Phys. Rev. X 9, 021034 (2019) - Published 20 May, 2019

A new theoretical analysis explores quantum phase transitions in the absence of symmetry breaking and identifies several strange and surprising quantum critical phenomena.

Dynamical Symmetry and Breathers in a Two-Dimensional Bose Gas

R. Saint-Jalm, P. C. M. Castilho, É. Le Cerf, B. Bakkali-Hassani, J.-L. Ville, S. Nascimbene, J. Beugnon, and J. Dalibard

Phys. Rev. X 9, 021035 (2019) - Published 21 May, 2019

The ways in which 2D Bose gases evolve from different initial conditions are related to each other through a subtle type of symmetry, which also reveals the existence of “breathing” geometric shapes in the gas.

Light-Induced Subpicosecond Lattice Symmetry Switch in MoTe2

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

Phys. Rev. X 9, 021036 (2019) - Published 22 May, 2019

Rapid pulses of laser light trigger subpicosecond phase transitions in the layered transition-metal dichalcogenide MoTe2, pointing to potential realizations of ultrafast topological switches.

Flow Equation Approach to Periodically Driven Quantum Systems

Michael Vogl, Pontus Laurell, Aaron D. Barr, and Gregory A. Fiete

Phys. Rev. X 9, 021037 (2019) - Published 23 May, 2019

New techniques for analyzing the response of quantum many-body systems to time-varying, periodic external fields extend current methods to the low-frequency regime, a critical step for predicting emergent novel phases.

Relating Chain Conformation to the Density of States and Charge Transport in Conjugated Polymers: The Role of the β-phase in Poly(9,9-dioctylfluorene)

Xingyuan Shi (侍兴源), Vojtech Nádaždy, Aleksandr Perevedentsev, Jarvist M. Frost, Xuhua Wang, Elizabeth von Hauff, Roderick C. I. MacKenzie, and Jenny Nelson

Phys. Rev. X 9, 021038 (2019) - Published 24 May, 2019

Experiments and multilevel modeling combine to reveal how different geometrical configurations of molecular units in a semiconducting polymer impact the electronic properties of the material.

Molecular Assembly of Ground-State Cooled Single Atoms

L. R. Liu, J. D. Hood, Y. Yu, J. T. Zhang, K. Wang, Y.-W. Lin, T. Rosenband, and K.-K. Ni

Phys. Rev. X 9, 021039 (2019) - Published 24 May, 2019

Researchers have created a molecule in a single, precisely characterized quantum state by merging two carefully prepared atoms.

Continuous Tensor Network States for Quantum Fields

Antoine Tilloy and J. Ignacio Cirac

Phys. Rev. X 9, 021040 (2019) - Published 28 May, 2019

An extension of tensor networks—mathematical tools that simplify the study of complex quantum systems—could allow their application to a broad range of quantum field theory problems.

2D Compass Codes

Muyuan Li, Daniel Miller, Michael Newman, Yukai Wu, and Kenneth R. Brown

Phys. Rev. X 9, 021041 (2019) - Published 29 May, 2019

An analysis of a family of quantum error-correcting codes provides fundamental properties and behaviors that will help in developing such codes for future robust quantum computing applications.

Materials Informatics Approach to the Identification of One-Band Correlated Materials Analogous to the Cuprates

Eric B. Isaacs and Chris Wolverton

Phys. Rev. X 9, 021042 (2019) - Published 30 May, 2019

A deep search of a large materials database turns up 14 strongly correlated materials with electronic properties similar to cuprates, a key step toward the design and discovery of compounds with exotic behaviors such as superconductivity.

Symmetry Breaking in Coupled SYK or Tensor Models

Jaewon Kim, Igor R. Klebanov, Grigory Tarnopolsky, and Wenli Zhao

Phys. Rev. X 9, 021043 (2019) - Published 31 May, 2019

A new analysis of quantum-mechanical models that describe interactions in large ensembles of Majorana fermions reveals richer phenomena in these complex systems, providing a potential path towards physical applications.

Normal State O17 NMR Studies of Sr2RuO4 under Uniaxial Stress

Yongkang Luo, A. Pustogow, P. Guzman, A. P. Dioguardi, S. M. Thomas, F. Ronning, N. Kikugawa, D. A. Sokolov, F. Jerzembeck, A. P. Mackenzie, C. W. Hicks, E. D. Bauer, I. I. Mazin, and S. E. Brown

Phys. Rev. X 9, 021044 (2019) - Published 31 May, 2019

Investigations of the superconductor Sr2RuO4 when mechanically stressed reveal increases in the electronic “density of states” and ferromagnetic fluctuations, both potentially important in relation to a known increase in the superconducting critical temperature.

Probing Context-Dependent Errors in Quantum Processors

Kenneth Rudinger, Timothy Proctor, Dylan Langharst, Mohan Sarovar, Kevin Young, and Robin Blume-Kohout

Phys. Rev. X 9, 021045 (2019) - Published 3 June, 2019

A new protocol benchmarks the stability of qubit-based processors, detecting whether quantum logic operations drift over time or are sensitive to crosstalk from neighboring qubits.

Beating the Fundamental Rate-Distance Limit in a Proof-of-Principle Quantum Key Distribution System

Shuang Wang, De-Yong He, Zhen-Qiang Yin, Feng-Yu Lu, Chao-Han Cui, Wei Chen, Zheng Zhou, Guang-Can Guo, and Zheng-Fu Han

Phys. Rev. X 9, 021046 (2019) - Published 4 June, 2019

A new protocol for distributing keys in a quantum network overcomes theoretical bounds for key transmission rates, potentially enabling implementation of secure communication in large networks.

Pair-Density-Wave Order and Paired Fractional Quantum Hall Fluids

Luiz H. Santos, Yuxuan Wang, and Eduardo Fradkin

Phys. Rev. X 9, 021047 (2019) - Published 5 June, 2019

A theoretical analysis provides new insight into how Majorana fermions behave in fractional quantum Hall systems, which, in turn, could lead to a better understanding of the interplay between topology and symmetry breaking in quantum matter.

High-Resolution Photoemission on Sr2RuO4 Reveals Correlation-Enhanced Effective Spin-Orbit Coupling and Dominantly Local Self-Energies

A. Tamai, M. Zingl, E. Rozbicki, E. Cappelli, S. Riccò, A. de la Torre, S. McKeown Walker, F. Y. Bruno, P. D. C. King, W. Meevasana, M. Shi, M. Radović, N. C. Plumb, A. S. Gibbs, A. P. Mackenzie, C. Berthod, H. U. R. Strand, M. Kim, A. Georges, and F. Baumberger

Phys. Rev. X 9, 021048 (2019) - Published 6 June, 2019

Experiments reveal that quasiparticle properties in the superconductor Sr2RuO4 have a significant angular dependence due to the combined effects of local electron interactions and spin-orbit coupling.

Quantum Dynamics of a Few-Photon Parametric Oscillator

Zhaoyou Wang, Marek Pechal, E. Alex Wollack, Patricio Arrangoiz-Arriola, Maodong Gao, Nathan R. Lee, and Amir H. Safavi-Naeini

Phys. Rev. X 9, 021049 (2019) - Published 7 June, 2019

Experiments demonstrate a quantum parametric oscillator, a device with great potential in quantum error correction. Its minimal hardware design makes it a suitable building block for scalable quantum computing.

First-Principles Theory of Spatial Dispersion: Dynamical Quadrupoles and Flexoelectricity

Miquel Royo and Massimiliano Stengel

Phys. Rev. X 9, 021050 (2019) - Published 12 June, 2019

Combining the “long-wave method”—a mainstay of condensed-matter theory since the 1950s—with modern electronic-structure techniques allows for highly accurate predictions of physical responses of crystals to nonhomogenous external perturbations.

Self-Trapping of Light Using the Pancharatnam-Berry Phase

Chandroth P. Jisha, Alessandro Alberucci, Jeroen Beeckman, and Stefan Nolte

Phys. Rev. X 9, 021051 (2019) - Published 13 June, 2019

Using carefully tailored rotations of a transparent anisotropic medium, light can be guided without resorting to local changes in the speed of light.

Bulk-Explosion-Induced Metal Spattering During Laser Processing

Cang Zhao, Qilin Guo, Xuxiao Li, Niranjan Parab, Kamel Fezzaa, Wenda Tan, Lianyi Chen, and Tao Sun

Phys. Rev. X 9, 021052 (2019) - Published 14 June, 2019

High-resolution x-ray imaging of a laser-based manufacturing technique has captured the formation process of molten metal projectiles that produce imperfections.

Hear the Sound of Weyl Fermions

Zhida Song and Xi Dai

Phys. Rev. X 9, 021053 (2019) - Published 17 June, 2019

A prediction of a new heat-transport mechanism—called chiral zero sound—may explain recent observations of a “giant” thermal conductivity in Weyl semimetals.

Topological Boundary Floppy Modes in Quasicrystals

Di Zhou, Leyou Zhang, and Xiaoming Mao

Phys. Rev. X 9, 021054 (2019) - Published 18 June, 2019

A theoretical analysis extends concepts of topological mechanics to quasicrystals—structures that are ordered but not periodic—and finds rich new physics with potential applications to problems in condensed matter and engineering.

Intertwined Spin and Orbital Density Waves in MnP Uncovered by Resonant Soft X-Ray Scattering

B. Y. Pan, H. Jang, J.-S. Lee, R. Sutarto, F. He, J. F. Zeng, Y. Liu, X. W. Zhang, Y. Feng, Y. Q. Hao, J. Zhao, H. C. Xu, Z. H. Chen, J. P. Hu, and D. L. Feng

Phys. Rev. X 9, 021055 (2019) - Published 19 June, 2019

X-ray scattering experiments on the superconductor manganese phosphide reveal two types of helical orbital arrangements that appear intertwined with the double helix of spins, suggesting that orbital physics may underlie its superconductivity.

Resolving Phonon Fock States in a Multimode Cavity with a Double-Slit Qubit

L. R. Sletten, B. A. Moores, J. J. Viennot, and K. W. Lehnert

Phys. Rev. X 9, 021056 (2019) - Published 20 June, 2019

A device enables the detection of single quanta of sound, a step towards using them in quantum technologies.

Cavity Casimir-Polder Forces and Their Effects in Ground-State Chemical Reactivity

Javier Galego, Clàudia Climent, Francisco J. Garcia-Vidal, and Johannes Feist

Phys. Rev. X 9, 021057 (2019) - Published 21 June, 2019

A theoretical analysis explores how light in a nanoscale cavity can induce chemical reactivity changes in a single simple molecule.

Microbial Range Expansions on Liquid Substrates

Severine Atis, Bryan T. Weinstein, Andrew W. Murray, and David R. Nelson

Phys. Rev. X 9, 021058 (2019) - Published 24 June, 2019

Fluid flows induced by nutrient gradients in the vicinity of microbial colonies help direct the expansion of those microbes into new territory.

Asymptotic Security of Continuous-Variable Quantum Key Distribution with a Discrete Modulation

Shouvik Ghorai, Philippe Grangier, Eleni Diamanti, and Anthony Leverrier

Phys. Rev. X 9, 021059 (2019) - Published 25 June, 2019

A theoretical study suggests that “continuous variable” quantum key distribution—an approach to quantum cryptography compatible with telecom networks—could be made absolutely secure against hacking.

Mpemba Index and Anomalous Relaxation

Israel Klich, Oren Raz, Ori Hirschberg, and Marija Vucelja

Phys. Rev. X 9, 021060 (2019) - Published 26 June, 2019

A theoretical analysis reveals two types of Mpemba effects—nonequilibrium shortcuts in which a hot system cools down faster than a colder one—which can be relevant to macroscopic everyday systems.

Probing Scrambling Using Statistical Correlations between Randomized Measurements

B. Vermersch, A. Elben, L. M. Sieberer, N. Y. Yao, and P. Zoller

Phys. Rev. X 9, 021061 (2019) - Published 27 June, 2019

A new analysis tool provides details on the amount of quantum information scrambling in a system by relying on statistical correlations among measured spin states as they evolve.

Critical Neuronal Models with Relaxed Timescale Separation

Anirban Das and Anna Levina

Phys. Rev. X 9, 021062 (2019) - Published 28 June, 2019

Models for self-organized critical systems require an external driving force to be much slower than the internal dynamics. A modified model illuminates how abandoning this requirement shapes dynamics in ensembles of neurons suggested to operate close to criticality.

Erratum: Phase-Matching Quantum Key Distribution [Phys. Rev. X 8, 031043 (2018)]

Xiongfeng Ma, Pei Zeng, and Hongyi Zhou

Phys. Rev. X 9, 029901 (2019) - Published 28 May, 2019

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