D. L. Craig, H. Moon, F. Fedele, D. T. Lennon, B. van Straaten, F. Vigneau, L. C. Camenzind, D. M. Zumbühl, G. A. D. Briggs, M. A. Osborne, D. Sejdinovic, and N. Ares
Phys. Rev. X 14, 011001 (2024) – Published 4 January 2024
Nominally identical quantum devices can display different current behaviors at the same voltage settings. A machine learning–based analysis reveals hidden features of material imperfections that lead to such behavior.
Using a soap bubble, researchers have created a laser that could act as a sensitive sensor for environmental parameters including atmospheric pressure.
Junhyeok Hur, Wonjun Lee, Kiryang Kwon, SeungJung Huh, Gil Young Cho, and Jae-yoon Choi
Phys. Rev. X 14, 011003 (2024) – Published 8 January 2024
An error-correction method for large-scale neutral atom quantum simulators using optical lattices can distinguish correlated particle-hole pairs from uncorrelated holes in the Mott insulator.
Optical spectroscopy of a transition metal dichalcogenide moiré semiconductor in the quantum anomalous Hall state reveals a surprising valley-coherent state, suggesting the need for a new theoretical mechanism for this effect.
D. R. Yahne, B. Placke, R. Schäfer, O. Benton, R. Moessner, M. Powell, J. W. Kolis, C. M. Pasco, A. F. May, M. D. Frontzek, E. M. Smith, B. D. Gaulin, S. Calder, and K. A. Ross
Phys. Rev. X 14, 011005 (2024) – Published 16 January 2024
A reassessment of the ground state of a quantum spin liquid candidate suggests the state is sensitive to imperceptible change in chemical composition, an insight that could help in tuning the system to exotic, quantum-disordered phases.
Phys. Rev. X 14, 011006 (2024) – Published 23 January 2024
A more efficient use of the atoms in a strontium optical lattice atomic clock reduces the measured instability by up to a factor of 2 compared to the standard approach.
B.-L. Najera-Santos, R. Rousseau, K. Gerashchenko, H. Patange, A. Riva, M. Villiers, T. Briant, P.-F. Cohadon, A. Heidmann, J. Palomo, M. Rosticher, H. le Sueur, A. Sarlette, W. C. Smith, Z. Leghtas, E. Flurin, T. Jacqmin, and S. Deléglise
Phys. Rev. X 14, 011007 (2024) – Published 24 January 2024
Researchers have demonstrated an unprecedentedly low-frequency superconducting “fluxonium” qubit, which could facilitate experiments that probe macroscopic quantum phenomena.
Thomas C. Day, S. Alireza Zamani-Dahaj, G. Ozan Bozdag, Anthony J. Burnetti, Emma P. Bingham, Peter L. Conlin, William C. Ratcliff, and Peter J. Yunker
Phys. Rev. X 14, 011008 (2024) – Published 25 January 2024
Experiments and simulations show that growth in living organisms easily leads to entanglement between their filamentous, branching structures.
Phys. Rev. X 14, 011009 (2024) – Published 26 January 2024
A new framework for approximate evaluation, or contraction, of a tensor network greatly expands the range of problems in quantum physics and computer science that may be accurately approximated by tensor network methods.
Moritz Cygorek, Jonathan Keeling, Brendon W. Lovett, and Erik M. Gauger
Phys. Rev. X 14, 011010 (2024) – Published 1 February 2024
An exact algorithm to calculate process tensors—compact representations of environmental influences—provides a scaling advantage over previous algorithms and enables tackling problems in open quantum systems that are currently out of reach.
A new photon-number amplification scheme, which combines the advantages of a single-photon detector and a power meter, could lead to new photon-detection possibilities in quantum-sensing and quantum-computing applications.
A theoretical study finds that the most energy-efficient way to control an active-matter system is to drive it at finite speed—unlike passive-matter systems.
Joseph T. Iosue, Kunal Sharma, Michael J. Gullans, and Victor V. Albert
Phys. Rev. X 14, 011013 (2024) – Published 8 February 2024
Quantum -designs—ensembles of states that mimic uniform averaging—for infinite-dimensional spaces do not exist, but an alternative “rigged -design” is possible.
Chi-Fang Chen, Alexander M. Dalzell, Mario Berta, Fernando G. S. L. Brandão, and Joel A. Tropp
Phys. Rev. X 14, 011014 (2024) – Published 9 February 2024
Identification of a large class of Hamiltonians that are easy to solve on quantum computers but difficult on classical ones provides a possible path to practical quantum advantage in the simulation of quantum systems.
A technique that can determine the chirality of a molecule using that molecule’s own electrons could allow researchers to probe the dynamical behavior of chiral molecules on very short timescales.
By monitoring a tiny worm’s embryonic cells, researchers have deduced that the availability of material for the membrane of a cell’s nucleus constrains the volume of the nucleus.
Researchers have measured short-timescale fluctuations in metastable systems, uncovering information about failed attempts to cross the barriers that define the metastable state.
Graham Baker, Timothy W. Branch, J. S. Bobowski, James Day, Davide Valentinis, Mohamed Oudah, Philippa McGuinness, Seunghyun Khim, Piotr Surówka, Yoshiteru Maeno, Thomas Scaffidi, Roderich Moessner, Jörg Schmalian, Andrew P. Mackenzie, and D. A. Bonn
Phys. Rev. X 14, 011018 (2024) – Published 15 February 2024
A new method for studying nondiffusive electron flow, based on microwave spectroscopy, reveals clear signs of ballistic flow in the ultrapure material PdCoO as well as novel anisotropic electron motion.
Phys. Rev. X 14, 011019 (2024) – Published 15 February 2024
The recently discovered class of unconventional antiferromagnets called altermagnets has a ferroic order parameter, the magnetic octupole, and the related order breaks time-reversal symmetry
Christian Liedl, Felix Tebbenjohanns, Constanze Bach, Sebastian Pucher, Arno Rauschenbeutel, and Philipp Schneeweiss
Phys. Rev. X 14, 011020 (2024) – Published 16 February 2024
Synchronized bursts of light observed in a system where each atom emits light only to the right and absorbs light only coming from the left show that atoms can synchronize their emission without having to interact symmetrically.
Logan A. Becker, Baowang Li, Nicholas J. Priebe, Eyal Seidemann, and Thibaud Taillefumier
Phys. Rev. X 14, 011021 (2024) – Published 16 February 2024
Achieving realistic subthreshold variability in a biophysical neuronal model requires low-level synchrony in its synaptic input drive, a finding that challenges current theories to explain spiking activity in cortical neurons.
Uddipta Kar, Elisha Cho-Hao Lu, Akhilesh Kr. Singh, P. V. Sreenivasa Reddy, Youngjoon Han, Xinwei Li, Cheng-Tung Cheng, Song Yang, Chun-Yen Lin, I-Chun Cheng, Chia-Hung Hsu, David Hsieh, Wei-Cheng Lee, Guang-Yu Guo, and Wei-Li Lee
Phys. Rev. X 14, 011022 (2024) – Published 20 February 2024
Surprising charge transport signatures in thin films of SrRuO suggest that current rectification effects could be a useful probe for surface states and edge states in topological materials.
Hao Qiao, Di Ai, Chang-Yue Sun, Cheng-Quan Peng, Qi-Chao Qi, Cheng-Cheng Zhao, Li-Meng Luo, Tao-Yun Jin, Tao Zhang, Min Zhou, and Xin-Ye Xu
Phys. Rev. X 14, 011023 (2024) – Published 20 February 2024
High-precision measurements of the absolute frequency of a forbidden optical transition in ytterbium sets the stage for a new clock standard and investigations into fundamental physics.
Vijay Balasubramanian, Albion Lawrence, Javier M. Magán, and Martin Sasieta
Phys. Rev. X 14, 011024 (2024) – Published 21 February 2024
A novel description of black-hole microstates as quantum superpositions of objects with geometric semiclassical descriptions explains the origin of black-hole entropy.
Kangheun Kim, Fan Yang, Klaus Mølmer, and Jaewook Ahn
Phys. Rev. X 14, 011025 (2024) – Published 21 February 2024
A new approach to constructing quantum spin Hamiltonians in a neutral-atom quantum simulator reveals never-before-seen phenomena in magnon bound states.
Brendan P. Marsh, Ronen M. Kroeze, Surya Ganguli, Sarang Gopalakrishnan, Jonathan Keeling, and Benjamin L. Lev
Phys. Rev. X 14, 011026 (2024) – Published 22 February 2024
A proposed multimode optical cavity capable of realizing a quantum spin glass offers a practicable platform for developing a comprehensive understanding of such systems.
Michael J. Hertaeg, Suzanne M. Fielding, and Dapeng Bi
Phys. Rev. X 14, 011027 (2024) – Published 22 February 2024
A model of epithelial cell monolayers helps reveal how the interplay between globally external shear and locally internal activity determines the emergent mechanical properties of a biological tissue as a whole.
New theoretical work establishes an analogy between systems that are dynamically frustrated, such as glasses, and thermodynamic systems whose members have conflicting goals, such as predator–prey ecosystems.
Blagoje Oblak, Bastien Lapierre, Per Moosavi, Jean-Marie Stéphan, and Benoit Estienne
Phys. Rev. X 14, 011030 (2024) – Published 27 February 2024
Most studies of quantum Hall droplets—2D electron fluids in strong magnetic fields—focus on isotropic cases. A first-principles analysis predicts behaviors of anisotropic droplets and proposes experimental signatures.
Researchers have determined the amount of transverse orbital angular momentum that a type of optical vortex carries per photon, an important step for future applications.
Phys. Rev. X 14, 011032 (2024) – Published 28 February 2024
Shortcuts to adiabaticity provide fast protocols for quantum state preparation. A new way to construct the auxiliary controls for guiding the system’s dynamics boosts their application to many-body systems.
H. Hainzer, D. Kiesenhofer, T. Ollikainen, M. Bock, F. Kranzl, M. K. Joshi, G. Yoeli, R. Blatt, T. Gefen, and C. F. Roos
Phys. Rev. X 14, 011033 (2024) – Published 29 February 2024
Correlation spectroscopy, where multiple qubits exposed to the same noise are probed simultaneously, extends the possible probe time beyond single-particle coherence.
Phys. Rev. X 14, 011035 (2024) – Published 4 March 2024
Compressive yielding of a colloidal gel induces a unique state, independent of strain history, suggesting the microstructures of gels possess an inherent ability to self-organize.
S. J. Zhang, X. Y. Zhou, S. X. Xu, Q. Wu, L. Yue, Q. M. Liu, T. C. Hu, R. S. Li, J. Y. Yuan, C. C. Homes, G. D. Gu, T. Dong, and N. L. Wang
Phys. Rev. X 14, 011036 (2024) – Published 4 March 2024
Terahertz responses of a cuprate after laser excitation reveal that the response along the CuO planes is not consistent with superconductivity, thereby providing clarification on recent reports of transient, light-induced superconductivity.
Phys. Rev. X 14, 011037 (2024) – Published 5 March 2024
An analytical framework describing ecosystems in which species interactions drive large population fluctuations provides a way to address fundamental questions about this dynamical state.
Bahar Asadipour, Emmanuel Beaurepaire, Xingjian Zhang, Anatole Chessel, Pierre Mahou, Willy Supatto, Marie-Claire Schanne-Klein, and Chiara Stringari
Phys. Rev. X 14, 011038 (2024) – Published 6 March 2024
A new model refines an optical microscopy technique, allowing for micrometer-scale discrimination of key protein types and their organization in mammalian biological tissues.
G. Wang, N. N. Wang, X. L. Shen, J. Hou, L. Ma, L. F. Shi, Z. A. Ren, Y. D. Gu, H. M. Ma, P. T. Yang, Z. Y. Liu, H. Z. Guo, J. P. Sun, G. M. Zhang, S. Calder, J.-Q. Yan, B. S. Wang, Y. Uwatoko, and J.-G. Cheng
Phys. Rev. X 14, 011040 (2024) – Published 7 March 2024
Researchers have measured a zero-resistance state for the nickelate LaNiO, which measurements suggest may superconduct at temperatures above the boiling point of liquid nitrogen.
Shang Ren, John Bonini, Massimiliano Stengel, Cyrus E. Dreyer, and David Vanderbilt
Phys. Rev. X 14, 011041 (2024) – Published 7 March 2024
A method for treating lattice dynamics in a magnetic crystal on an equal footing with spin dynamics opens the door to systematic investigations of vibrational modes in a wide variety of magnetic systems.
Shangfei Wu, Mason L. Klemm, Jay Shah, Ethan T. Ritz, Chunruo Duan, Xiaokun Teng, Bin Gao, Feng Ye, Masaaki Matsuda, Fankang Li, Xianghan Xu, Ming Yi, Turan Birol, Pengcheng Dai, and Girsh Blumberg
Phys. Rev. X 14, 011043 (2024) – Published 8 March 2024
An increase in crystalline symmetry upon cooling is rare. But experiments show a new example of the phenomenon in the magnetic kagome metal FeGe.
Cheng Long, Matthew J. Deutsch, Joseph Angelo, Christopher Culbreath, Hiroshi Yokoyama, Jonathan V. Selinger, and Robin L. B. Selinger
Phys. Rev. X 14, 011044 (2024) – Published 11 March 2024
In a crystalline solid under mechanical stress, pinned defect lines can repeatedly bow and detach, generating concentric loops. New work shows that this behavior can also occur in nematic liquid crystals.
K. Imamura, Y. Mizukami, O. Tanaka, R. Grasset, M. Konczykowski, N. Kurita, H. Tanaka, Y. Matsuda, M. G. Yamada, K. Hashimoto, and T. Shibauchi
Phys. Rev. X 14, 011045 (2024) – Published 11 March 2024
Introducing defects into the layered honeycomb magnet -RuCl induces low-energy excitation that have properties akin to Majorana fermions, a key insight to understanding the influence of disorder on Kitaev materials.
Phys. Rev. X 14, 011046 (2024) – Published 13 March 2024
The emergence of an excitonic insulator state—in which bound pairs of electrons and holes condense at low temperature—with only minimal distortions of the atomic lattice rules out such distortions as the origin of this exotic quantum state.
Peng Zhang, Yuyang Dong, Dayu Yan, Bei Jiang, Tao Yang, Jun Li, Zhaopeng Guo, Yong Huang, Haobo, Qing Li, Yupeng Li, Kifu Kurokawa, Rui Wang, Yuefeng Nie, Makoto Hashimoto, Donghui Lu, Wen-He Jiao, Jie Shen, Tian Qian, Zhijun Wang, Youguo Shi, and Takeshi Kondo
Phys. Rev. X 14, 011047 (2024) – Published 13 March 2024
A new material hosts clean excitonic states—excitations of electron-hole pairs—thus providing a powerful platform for studying the novel physics of these excitations.
T.-K. Hsiao, P. Cova Fariña, S. D. Oosterhout, D. Jirovec, X. Zhang, C. J. van Diepen, W. I. L. Lawrie, C.-A. Wang, A. Sammak, G. Scappucci, M. Veldhorst, E. Demler, and L. M. K. Vandersypen
Phys. Rev. X 14, 011048 (2024) – Published 14 March 2024
The creation and movement of excitons, or bound electron-hole pairs, in a quantum dot array establishes a potential platform for future studies of a wide range of excitonic phenomena.
M. Reza Rahimi Tabar, Farnik Nikakhtar, Laya Parkavousi, Amin Akhshi, Ulrike Feudel, and Klaus Lehnertz
Phys. Rev. X 14, 011050 (2024) – Published 18 March 2024
An innovative approach for analyzing complex systems sets the stage for a detailed understanding of the directions and strengths of pairwise and higher-order interactions in many fields ranging from neuroscience to finance to ecology.
Researchers have realized a recently proposed qubit in which the errors mostly involve erasure of the qubit state, an advance that could help simplify the architecture of fault-tolerant quantum computers.
Phys. Rev. X 14, 011052 (2024) – Published 21 March 2024
An analysis of relationships between topology, quantum geometry, and optical absorption reveals an upper bound on the energy gap of topological insulators.
H. Miao, J. Bouaziz, G. Fabbris, W. R. Meier, F. Z. Yang, H. X. Li, C. Nelson, E. Vescovo, S. Zhang, A. D. Christianson, H. N. Lee, Y. Zhang, C. D. Batista, and S. Blügel
Phys. Rev. X 14, 011053 (2024) – Published 21 March 2024
X-ray magnetic-scattering experiments reveal never-before-seen spontaneous chirality flipping in the electronic order of the topological semimetal EuAl.
Asaf A. Diringer, Eliya Blumenthal, Avishay Grinberg, Liang Jiang, and Shay Hacohen-Gourgy
Phys. Rev. X 14, 011055 (2024) – Published 26 March 2024
A new method for fast entangling operations on quantum states does so 100 times faster than previous approaches and requires only a single control element, offering a fast control platform for quantum information processing.
Min Wang, Zhi-Gang Hu, Chenghao Lao, Yuanlei Wang, Xing Jin, Xin Zhou, Yuechen Lei, Ze Wang, Wenjing Liu, Qi-Fan Yang, and Bei-Bei Li
Phys. Rev. X 14, 011056 (2024) – Published 26 March 2024
A novel microresonator design greatly enhances the coupling between light and mechanical vibrations, allowing for much more compact and efficient optical control of acoustic phonons in optomechanical devices.
Alexander Altland, Piet W. Brouwer, Johannes Dieplinger, Matthew S. Foster, Mateo Moreno-Gonzalez, and Luka Trifunovic
Phys. Rev. X 14, 011057 (2024) – Published 27 March 2024
In some topological states of matter, a surface-bulk connection called spectral flow underpins many of the material’s unusual properties. A new analysis, however, shows that most 3D topological phases do not actually possess spectral flow.
Phys. Rev. X 14, 011058 (2024) – Published 27 March 2024
A formalism for computing nonlinear conductivities in quantum materials extends existing theoretical work to include spatially varying currents and voltage profiles.
Phys. Rev. X 14, 011059 (2024) – Published 28 March 2024
Rigorous analysis of the finite-size error in quantum chemistry methods for periodic systems toward the thermodynamic limit reveals surprising theoretical properties.