Physics

Single-shot error correction on toric codes with high-weight stabilizers

PRA: Quantum information - Wed, 2024-05-29 12:00

Author(s): Yingjia Lin, Shilin Huang, and Kenneth R. Brown

For quantum error correction codes the required number of measurement rounds typically increases with the code distance when measurements are faulty. Single-shot error correction allows for an error threshold with only one round of noisy syndrome measurements regardless of the code size. Here we imp…


[Phys. Rev. A 109, 052438] Published Wed May 29, 2024

Categories: Journals, Physics

Generalized wave-particle-mixedness triality for $n$-path interferometers

PRA: Quantum information - Wed, 2024-05-29 12:00

Author(s): Yuntao Tsui and Sunho Kim

The wave-particle duality, one of the expressions of Bohr complementarity, is usually quantified by path predictability and the visibility of interference fringes. With the development of quantum resource theory, quantitative analysis of wave-particle duality is increasing, most of which are express…


[Phys. Rev. A 109, 052439] Published Wed May 29, 2024

Categories: Journals, Physics

Correlation-Pattern-Based Continuous Variable Entanglement Detection through Neural Networks

Author(s): Xiaoting Gao, Mathieu Isoard, Fengxiao Sun, Carlos E. Lopetegui, Yu Xiang, Valentina Parigi, Qiongyi He, and Mattia Walschaers

Entanglement in continuous-variable non-Gaussian states provides irreplaceable advantages in many quantum information tasks. However, the sheer amount of information in such states grows exponentially and makes a full characterization impossible. Here, we develop a neural network that allows us to u…


[Phys. Rev. Lett. 132, 220202] Published Wed May 29, 2024

Categories: Journals, Physics

Statistics of Local Level Spacings in Single- and Many-Body Quantum Chaos

Author(s): Peng Tian, Roman Riser, and Eugene Kanzieper

We introduce a notion of local level spacings and study their statistics within a random-matrix-theory approach. In the limit of infinite-dimensional random matrices, we determine universal sequences of mean local spacings and of their ratios which uniquely identify the global symmetries of a quantu…


[Phys. Rev. Lett. 132, 220401] Published Wed May 29, 2024

Categories: Journals, Physics

Biorthogonal Dynamical Quantum Phase Transitions in Non-Hermitian Systems

Author(s): Yecheng Jing, Jian-Jun Dong, Yu-Yu Zhang, and Zi-Xiang Hu

By utilizing biorthogonal bases, we develop a comprehensive framework for studying biorthogonal dynamical quantum phase transitions in non-Hermitian systems. With the help of the previously overlooked associated state, we define the automatically normalized biorthogonal Loschmidt echo. This approach…


[Phys. Rev. Lett. 132, 220402] Published Wed May 29, 2024

Categories: Journals, Physics

Beating the Standard Quantum Limit Electronic Field Sensing by Simultaneously Using Quantum Entanglement and Squeezing

Author(s): X. N. Feng, M. Zhang, and L. F. Wei

Quantum entanglement and quantum squeezing are two typical approaches to beat the standard quantum limit (SQL) for the sensitive phase estimations in quantum metrology. Each of them has already been utilized individually and sequentially to improve the sensitivity of electric field sensing with the …


[Phys. Rev. Lett. 132, 220801] Published Wed May 29, 2024

Categories: Journals, Physics

Proton Effective Charge Depends on Neutron Population

APS Physics - Wed, 2024-05-29 12:00

Author(s): David Ehrenstein

Experiments comparing neutron-rich cadmium with previous data on a neutron-poor version prove that a key parameter in nuclear calculations depends on the neutron-to-proton ratio.


[Physics 17, s65] Published Wed May 29, 2024

Categories: Physics

<i>Colloquium</i>: Spin-orbit effects in superconducting hybrid structures

Reviews of Modern Physics - Tue, 2024-05-28 12:00

Author(s): Morten Amundsen, Jacob Linder, Jason W. A. Robinson, Igor Žutić, and Niladri Banerjee

In many solids, the spin-orbit interaction is only a small effect. However, in certain materials it leads to new phenomena. This Colloquium reviews the role of spin-orbit interaction in superconducting hybrid structures, where it can lead to exotic states such as spin-triplet pairing, topological superconductivity, and the superconducting diode effect. These are fundamental interest and importance for applications, including spintronics and quantum computing.


[Rev. Mod. Phys. 96, 021003] Published Tue May 28, 2024

Categories: Journals, Physics

Phase-Sensitive Quantum Measurement without Controlled Operations

Author(s): Yilun Yang, Arthur Christianen, Mari Carmen Bañuls, Dominik S. Wild, and J. Ignacio Cirac

Many quantum algorithms rely on the measurement of complex quantum amplitudes. Standard approaches to obtain the phase information, such as the Hadamard test, give rise to large overheads due to the need for global controlled-unitary operations. We introduce a quantum algorithm based on complex anal…


[Phys. Rev. Lett. 132, 220601] Published Tue May 28, 2024

Categories: Journals, Physics

Parity Quantum Computing as $yz$-Plane Measurement-Based Quantum Computing

Author(s): Isaac D. Smith, Hendrik Poulsen Nautrup, and Hans J. Briegel

We show that universal parity quantum computing employing a recently introduced constant depth decoding procedure is equivalent to measurement-based quantum computation (MBQC) on a bipartite graph using only yz-plane measurements. We further show that any unitary MBQC using only yz-plane measurement…


[Phys. Rev. Lett. 132, 220602] Published Tue May 28, 2024

Categories: Journals, Physics

Classifying the Surface Magnetization of Antiferromagnets

APS Physics - Tue, 2024-05-28 12:00

Author(s): Sai Mu

Group theory and first-principles calculations combine to predict which antiferromagnets have potentially useful net surface magnetization.


[Physics 17, 88] Published Tue May 28, 2024

Categories: Physics

Thin Films of Topological Magnets for Thermoelectric Applications

APS Physics - Tue, 2024-05-28 12:00

Author(s): Marric Stevens

A thin film of a topological magnet displays a large thermoelectric effect that doesn’t require an applied magnetic field—a behavior that could lead to new energy-harvesting devices.


[Physics 17, s66] Published Tue May 28, 2024

Categories: Physics

Pseudomagic Quantum States

Author(s): Andi Gu, Lorenzo Leone, Soumik Ghosh, Jens Eisert, Susanne F. Yelin, and Yihui Quek

The newly constructed pseudomagic ensembles possess low nonstabilizerness but are computationally indistinguishable from those with high nonstabilizerness, having implications for quantum scramblers, quantum cryptography, and magic state distillation.


[Phys. Rev. Lett. 132, 210602] Published Fri May 24, 2024

Categories: Journals, Physics

Time-Symmetric Motion Maximizes Energy Efficiency in Fluid

APS Physics - Fri, 2024-05-24 12:00

Author(s): Philip Ball

Researchers discovered a trick for dragging an object in a fluid with minimal effort, suggesting an optimal strategy for nanorobots.


[Physics 17, 87] Published Fri May 24, 2024

Categories: Physics

Quantum search in many-body interacting systems with long-range interactions

PRA: Quantum information - Thu, 2024-05-23 12:00

Author(s): Fan Xing, Yan Wei, and Zeyang Liao

Continuous-time quantum walks provide an alternative method for quantum search problems. Most earlier studies confirmed that quadratic speedup exists in some synthetic Hamiltonians, but whether there is quadratic speedup in real physical systems remains elusive. Here, we investigate three physical s…


[Phys. Rev. A 109, 052435] Published Thu May 23, 2024

Categories: Journals, Physics

Activation of entanglement in generalized entanglement swapping

PRA: Quantum information - Thu, 2024-05-23 12:00

Author(s): Pratapaditya Bej and Abhishek Banerjee

We study entanglement activation in a generalized entanglement swapping process involving two Bell pairs and generalized measurements. The conventional understanding posits entangled measurements as both necessary and sufficient for establishing entanglement between distant parties. In this study, w…


[Phys. Rev. A 109, 052437] Published Thu May 23, 2024

Categories: Journals, Physics

When superconductivity crosses over: From BCS to BEC

Reviews of Modern Physics - Thu, 2024-05-23 12:00

Author(s): Qijin Chen, Zhiqiang Wang, Rufus Boyack, Shuolong Yang, and K. Levin

The theory of unconventional superconductors continues to provide profound puzzles. The crossover between the weakly coupled Bardeen-Cooper-Schrieffer (BCS) state and the strong-pairing Bose-Einstein condensate (BEC) provides a useful perspective on how to address these questions. This paper describes a self-consistent framework for thinking about the crossover regime in between these two limits. The review discusses to what extent this BCS-BEC theory applies to a range of classes of superconducting materials including the cuprates, iron pnictides, twisted bilayer graphene, and interfacial superconductivity among others.


[Rev. Mod. Phys. 96, 025002] Published Thu May 23, 2024

Categories: Journals, Physics

Experimental Realization of Self-Contained Quantum Refrigeration

Author(s): Keyi Huang, Cheng Xi, Xinyue Long, Hongfeng Liu, Yu-ang Fan, Xiangyu Wang, Yuxuan Zheng, Yufang Feng, Xinfang Nie, and Dawei Lu

A fundamental challenge in quantum thermodynamics is the exploration of inherent dimensional constraints in thermodynamic machines. In the context of two-level systems, the most compact refrigerator necessitates the involvement of three entities, operating under self-contained conditions that preclu…


[Phys. Rev. Lett. 132, 210403] Published Thu May 23, 2024

Categories: Journals, Physics

Ultrablack Coating Could Reduce Stray Light in Telescopes

APS Physics - Thu, 2024-05-23 12:00

Author(s): Sarah Wells

Using atomic layer deposition, scientists have created a new light-absorbing thin film that could help telescopes see a starrier night.


[Physics 17, 86] Published Thu May 23, 2024

Categories: Physics

Cosmic Strings’ Imprints in High-Frequency Gravitational Waves

APS Physics - Thu, 2024-05-23 12:00

Author(s): Matteo Rini

Spacetime wrinkles known as cosmic strings, which might have formed in the early Universe, could be a dominant source of gravitational waves at ultrahigh frequencies, according to new calculations.


[Physics 17, s62] Published Thu May 23, 2024

Categories: Physics
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