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Electron–Hole System Harbors Rich Phases

APS Physics - Wed, 2024-05-08 12:00

Author(s): Ryan Wilkinson

Researchers predict that several exotic states of matter can exist in semiconductor structures hosting electrons in one layer and holes in another.


[Physics 17, s49] Published Wed May 08, 2024

Categories: Physics

Dissipatively stabilized superposition of squeezed coherent states via periodically breaking the qubit inversion symmetry

PRA: Quantum information - Tue, 2024-05-07 12:00

Author(s): Peng Xie, Xing-chen Wang, Jing-wei Wang, Xin-ke Li, Yuan Zhou, Guang-hui Wang, Fazal Badshah, and Yong-chen Xiong

We propose a scheme to dissipatively stabilize superpositions of squeezed coherent states for single- and two-resonator modes in superconducting circuits, where a superconducting qubit is coupled to a single or two parametrically driven transmission-line resonators with different circuit designs. A …


[Phys. Rev. A 109, 052409] Published Tue May 07, 2024

Categories: Journals, Physics

Quantum-assisted Hilbert-space Gaussian process regression

PRA: Quantum information - Tue, 2024-05-07 12:00

Author(s): Ahmad Farooq, Cristian A. Galvis-Florez, and Simo Särkkä

Gaussian processes are probabilistic models that are commonly used as functional priors in machine learning. Due to their probabilistic nature, they can be used to capture prior information on the statistics of noise, smoothness of the functions, and training data uncertainty. However, their computa…


[Phys. Rev. A 109, 052410] Published Tue May 07, 2024

Categories: Journals, Physics

Predicting the onset of quantum synchronization using machine learning

PRA: Quantum information - Tue, 2024-05-07 12:00

Author(s): F. Mahlow, B. Çakmak, G. Karpat, İ. Yalçınkaya, and F. F. Fanchini

In an open system, environment-induced synchronization can occur between the expectation values of spin observables of a pair of qubits. Here, the authors apply a machine learning method to predict the emergence of such synchronization.


[Phys. Rev. A 109, 052411] Published Tue May 07, 2024

Categories: Journals, Physics

Bell Nonlocality in Classical Systems Coexisting with Other System Types

Author(s): Giulio Chiribella, Lorenzo Giannelli, and Carlo Maria Scandolo

If classical systems were to coexist with “anticlassical” systems (coined here) then an observer with access to both systems could measure Bell nonlocality and other nonclassical features.


[Phys. Rev. Lett. 132, 190201] Published Tue May 07, 2024

Categories: Journals, Physics

Quantum Work Statistics at Strong Reservoir Coupling

Author(s): Owen Diba, Harry J. D. Miller, Jake Iles-Smith, and Ahsan Nazir

Determining the statistics of work done on a quantum system while strongly coupled to a reservoir is a formidable task, requiring the calculation of the full eigenspectrum of the combined system and reservoir. Here, we show that this issue can be circumvented by using a polaron transformation that m…


[Phys. Rev. Lett. 132, 190401] Published Tue May 07, 2024

Categories: Journals, Physics

Alleviating the Stress of Finding a PhD Advisor

APS Physics - Tue, 2024-05-07 12:00

Author(s): Katherine Wright

At many US universities, no formal procedure exists to help physics students pick a PhD project and a supervisor. Researchers argue it’s time for that to change.


[Physics 17, 76] Published Tue May 07, 2024

Categories: Physics

Filamentation Observed in Wakefield Acceleration

APS Physics - Tue, 2024-05-07 12:00

Author(s): Rachel Berkowitz

A particle-beam-generating method—called wakefield acceleration—uses proton bunches, which can fragment into high-density filaments as a result of their interactions with plasma, new experiments show.


[Physics 17, s48] Published Tue May 07, 2024

Categories: Physics

Inner bounding the quantum entropy cone with subadditivity and subsystem coarse grainings

PRA: Quantum information - Mon, 2024-05-06 12:00

Author(s): Temple He, Veronika E. Hubeny, and Massimiliano Rota

We show via explicit construction that all the extreme rays of both the three-party quantum entropy cone and the four-party stabilizer entropy cone can be obtained from subsystem coarse grainings of specific higher-party quantum states, namely, extreme states characterized by saturating a (nontrivia…


[Phys. Rev. A 109, 052407] Published Mon May 06, 2024

Categories: Journals, Physics

Unbreakable and breakable quantum censorship

PRA: Quantum information - Mon, 2024-05-06 12:00

Author(s): Julien Pinske and Jan Sperling

A protocol for regulating the distribution of quantum information between multiple parties is put forward. To prohibit the unrestricted distribution of quantum-resource states in a public quantum network, agents can apply a resource-destroying map to each sender's channel. Since resource-destroying …


[Phys. Rev. A 109, 052408] Published Mon May 06, 2024

Categories: Journals, Physics

No-go theorem for entanglement distillation using catalysis

PRA: Quantum information - Fri, 2024-05-03 12:00

Author(s): Ludovico Lami, Bartosz Regula, and Alexander Streltsov

Not all entanglement is distillable, i.e., extractable in pure form. In this work, the authors show that being assisted by catalysts, which generally can help transform quantum states, is not enough to change this; certain entangled states will stay “bound entangled” even when catalysts are allowed.


[Phys. Rev. A 109, L050401] Published Fri May 03, 2024

Categories: Journals, Physics

Two-Dimensional Simulation Captures the Ocean’s Energy Cycle

APS Physics - Fri, 2024-05-03 12:00

Author(s): David Ehrenstein

A new model provides an improved description of the flow of the ocean’s kinetic energy by including friction with the coasts.


[Physics 17, 77] Published Fri May 03, 2024

Categories: Physics

Spinning Up Rydberg Atoms Extends Their Life

APS Physics - Fri, 2024-05-03 12:00

Author(s): Michael Schirber

Researchers record the longest Rydberg-atom lifetime by placing strontium atoms in “circular” states, where the outer electrons move in planet-like orbits.


[Physics 17, s52] Published Fri May 03, 2024

Categories: Physics

Iterative layerwise training for the quantum approximate optimization algorithm

PRA: Quantum information - Thu, 2024-05-02 12:00

Author(s): Xinwei Lee, Xinjian Yan, Ningyi Xie, Dongsheng Cai, Yoshiyuki Saito, and Nobuyoshi Asai

The capability of the quantum approximate optimization algorithm (QAOA) in solving combinatorial optimization problems has been intensively studied in recent years due to its application in the quantum-classical hybrid regime. Despite having difficulties that are innate in the variational quantum al…


[Phys. Rev. A 109, 052406] Published Thu May 02, 2024

Categories: Journals, Physics

Experimental Virtual Distillation of Entanglement and Coherence

Author(s): Ting Zhang, Yukun Zhang, Lu Liu, Xiao-Xu Fang, Qian-Xi Zhang, Xiao Yuan, and He Lu

Noise is, in general, inevitable and detrimental to practical and useful quantum communication and computation. Under the resource theory framework, resource distillation serves as a generic tool to overcome the effect of noise. Yet, conventional resource distillation protocols generally require ope…


[Phys. Rev. Lett. 132, 180201] Published Thu May 02, 2024

Categories: Journals, Physics

Arbitrary Amplification of Quantum Coherence in Asymptotic and Catalytic Transformation

Author(s): Naoto Shiraishi and Ryuji Takagi

Quantum coherence is one of the fundamental aspects distinguishing classical and quantum theories. Coherence between different energy eigenstates is particularly important, as it serves as a valuable resource under the law of energy conservation. A fundamental question in this setting is how well on…


[Phys. Rev. Lett. 132, 180202] Published Thu May 02, 2024

Categories: Journals, Physics

Erasure Detection of a Dual-Rail Qubit Encoded in a Double-Post Superconducting Cavity

Author(s): Akshay Koottandavida, Ioannis Tsioutsios, Aikaterini Kargioti, Cassady R. Smith, Vidul R. Joshi, Wei Dai, James D. Teoh, Jacob C. Curtis, Luigi Frunzio, Robert J. Schoelkopf, and Michel H. Devoret

Dual-rail erasure qubits are characterized in a superconducting cavity architecture that allows for an improved error correction.


[Phys. Rev. Lett. 132, 180601] Published Thu May 02, 2024

Categories: Journals, Physics

Single-Shot Readout of a Nuclear Spin in Silicon Carbide

Author(s): Xiao-Yi Lai, Ren-Zhou Fang, Tao Li, Ren-Zhu Su, Jia Huang, Hao Li, Li-Xing You, Xiao-Hui Bao, and Jian-Wei Pan

Solid-state qubits with a photonic interface is very promising for quantum networks. Color centers in silicon carbide have shown excellent optical and spin coherence, even when integrated with membranes and nanostructures. Additionally, nuclear spins coupled with electron spins can serve as long-liv…


[Phys. Rev. Lett. 132, 180803] Published Thu May 02, 2024

Categories: Journals, Physics

High-Fidelity Optical Readout of a Nuclear-Spin Qubit in Silicon Carbide

Author(s): Erik Hesselmeier, Pierre Kuna, Wolfgang Knolle, Florian Kaiser, Nguyen Tien Son, Misagh Ghezellou, Jawad Ul-Hassan, Vadim Vorobyov, and Jörg Wrachtrup

Quantum state readout is a key requirement for a successful qubit platform. In this work, we demonstrate a high-fidelity quantum state readout of a V2 center nuclear spin based on a repetitive readout technique. We demonstrate up to 99.5% readout fidelity and 99% for state preparation. Using this ef…


[Phys. Rev. Lett. 132, 180804] Published Thu May 02, 2024

Categories: Journals, Physics

Fluxonium Qubits Under Control

APS Physics - Thu, 2024-05-02 12:00

Author(s): Marric Stephens

By coupling two fluxonium qubits through an inductive circuit rather than through a capacitor, researchers have realized a high-fidelity two-qubit gate.


[Physics 17, s55] Published Thu May 02, 2024

Categories: Physics
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