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Robust Spectral $π$ Pairing in the Random-Field Floquet Quantum Ising Model

Author(s): Harald Schmid, Alexander-Georg Penner, Kang Yang, Leonid Glazman, and Felix von Oppen

Motivated by an experiment on a superconducting quantum processor [X. Mi et al., Science 378, 785 (2022).], we study level pairings in the many-body spectrum of the random-field Floquet quantum Ising model. The pairings derive from Majorana zero and π modes when writing the spin model in Jordan-Wig…


[Phys. Rev. Lett. 132, 210401] Published Mon May 20, 2024

Categories: Journals, Physics

Quantum-Enhanced Metrology with Network States

Author(s): Yuxiang Yang, Benjamin Yadin, and Zhen-Peng Xu

Armed with quantum correlations, quantum sensors in a network have shown the potential to outclass their classical counterparts in distributed sensing tasks such as clock synchronization and reference frame alignment. On the other hand, this analysis was done for simple and idealized networks, where…


[Phys. Rev. Lett. 132, 210801] Published Mon May 20, 2024

Categories: Journals, Physics

Informing Potential Remedies for Quasiparticle Poisoning

APS Physics - Mon, 2024-05-20 12:00

Author(s): Max Hays, Kyle Serniak, and William D. Oliver

Measurements of the temperature distribution of quasiparticles in superconducting circuits reveal behavior that could inform strategies for mitigating quasiparticle-induced errors in superconducting qubits.


[Physics 17, 82] Published Mon May 20, 2024

Categories: Physics

Multiple-quadrature-amplitude-modulation continuous-variable quantum key distribution realization with a downstream-access network

PRA: Quantum information - Fri, 2024-05-17 12:00

Author(s): Junyu Zhang, Xiangyu Wang, Fan Xia, Song Yu, and Ziyang Chen

Quantum networks based on quantum key distribution ensure the security which is guaranteed by the fundamental laws of quantum physics between multiple parties. The discrete-modulation (DM) continuous-variable quantum key distribution (CV-QKD) protocols have the characteristics of simple implementati…


[Phys. Rev. A 109, 052429] Published Fri May 17, 2024

Categories: Journals, Physics

Lanthanum Less Abundant Than Previously Thought

APS Physics - Fri, 2024-05-17 12:00

Author(s): Katherine Wright

Measurements related to the production of lanthanum in stars where elements are thought to form via the “i process” indicate that less of the element is produced than models predict.


[Physics 17, 78] Published Fri May 17, 2024

Categories: Physics

Measuring the First Moments of Crystallization

APS Physics - Fri, 2024-05-17 12:00

Author(s): Mark Buchanan

A new liquid-jet technology enabled researchers to test the theory for liquid freezing more stringently than was possible in previous experiments, but uncertainties remain.


[Physics 17, 84] Published Fri May 17, 2024

Categories: Physics

Generation of squeezed Fock states by measurement

PRA: Quantum information - Thu, 2024-05-16 12:00

Author(s): S. B. Korolev, E. N. Bashmakova, A. K. Tagantsev, and T. Yu. Golubeva

The generation of squeezed Fock states by the one or more photon subtraction from a two-mode entangled Gaussian (TMEG) state is theoretically addressed. We showed that an arbitrary order Fock state can be generated this way and we obtained a condition that should be imposed on the parameters of the …


[Phys. Rev. A 109, 052428] Published Thu May 16, 2024

Categories: Journals, Physics

Coherence Manipulation in Asymmetry and Thermodynamics

Author(s): Tulja Varun Kondra, Ray Ganardi, and Alexander Streltsov

In the classical regime, thermodynamic state transformations are governed by the free energy. This is also called as the second law of thermodynamics. Previous works showed that, access to a catalytic system allows us to restore the second law in the quantum regime when we ignore coherence. However,…


[Phys. Rev. Lett. 132, 200201] Published Thu May 16, 2024

Categories: Journals, Physics

Uncertainty Relations from State Polynomial Optimization

Author(s): Moisés Bermejo Morán and Felix Huber

Uncertainty relations are a fundamental feature of quantum mechanics. How can these relations be found systematically? Here, we develop a semidefinite programming hierarchy for additive uncertainty relations in the variances of noncommuting observables. Our hierarchy is built on the state polynomial…


[Phys. Rev. Lett. 132, 200202] Published Thu May 16, 2024

Categories: Journals, Physics

Open Quantum System Dynamics from Infinite Tensor Network Contraction

Author(s): Valentin Link, Hong-Hao Tu, and Walter T. Strunz

Approaching the long-time dynamics of non-Markovian open quantum systems presents a challenging task if the bath is strongly coupled. Recent proposals address this problem through a representation of the so-called process tensor in terms of a tensor network. We show that for Gaussian environments hi…


[Phys. Rev. Lett. 132, 200403] Published Thu May 16, 2024

Categories: Journals, Physics

Selective Detection of Dynamics-Complete Set of Correlations via Quantum Channels

Author(s): Ze Wu, Ping Wang, Tianyun Wang, Yuchen Li, Ran Liu, Yuquan Chen, Xinhua Peng, and Ren-Bao Liu

Correlations of fluctuations are essential to understanding many-body systems and key information for advancing quantum technologies. To fully describe the dynamics of a physical system, all time-ordered correlations (TOCs), i.e., the dynamics-complete set of correlations are needed. The current mea…


[Phys. Rev. Lett. 132, 200802] Published Thu May 16, 2024

Categories: Journals, Physics

How Water Flows inside a Sea Sponge

APS Physics - Thu, 2024-05-16 12:00

Author(s): Charles Day

A deep-sea sponge’s intricate skeleton converts the horizontal flow of ocean currents into a vertical flow through the sponge’s body—a mechanism that helps with the sponge’s filter feeding.


[Physics 17, 81] Published Thu May 16, 2024

Categories: Physics

Long-time quantum scrambling and generalized tensor product structures

PRA: Quantum information - Wed, 2024-05-15 12:00

Author(s): Faidon Andreadakis, Emanuel Dallas, and Paolo Zanardi

Much recent work has been devoted to the study of information scrambling in quantum systems. In this paper, we study the long-time properties of the algebraic out-of-time-order-correlator (“A−OTOC”) and derive an analytical expression for its long-time average under the nonresonance condition. The A…


[Phys. Rev. A 109, 052424] Published Wed May 15, 2024

Categories: Journals, Physics

Optimization of algorithmic errors in analog quantum simulations

PRA: Quantum information - Wed, 2024-05-15 12:00

Author(s): Nikita A. Zemlevskiy, Henry F. Froland, and Stephan Caspar

A method for analyzing uncertainties in so-called analog quantum simulations could help scientists make precise predictions using these models.


[Phys. Rev. A 109, 052425] Published Wed May 15, 2024

Categories: Journals, Physics

Quantum entanglement estimation via symmetric-measurement-based positive maps

PRA: Quantum information - Wed, 2024-05-15 12:00

Author(s): Jiaxin Li, Hongmei Yao, Shao-Ming Fei, Zhaobing Fan, and Haitao Ma

We provide a class of positive and trace-preserving maps based on symmetric measurements. From these positive maps we present separability criteria, entanglement witnesses, and the lower bounds of concurrence. We show by detailed examples that our separability criteria, entanglement witnesses, and l…


[Phys. Rev. A 109, 052426] Published Wed May 15, 2024

Categories: Journals, Physics

Boson sampling from non-Gaussian states

PRA: Quantum information - Wed, 2024-05-15 12:00

Author(s): Craig S. Hamilton and Igor Jex

Boson sampling has emerged as an important tool to demonstrate the difference between quantum and classical computers and has attracted the interest of experimentalists and theoreticians. In this work we study boson sampling from general, single-mode states using a scheme that can generate any such …


[Phys. Rev. A 109, 052427] Published Wed May 15, 2024

Categories: Journals, Physics

Quantifying Uncertainties in Quantum Simulations

APS Physics - Wed, 2024-05-15 12:00

Author(s): Ryan Wilkinson

A method for analyzing uncertainties in so-called analog quantum simulations could help scientists make precise predictions using these models.


[Physics 17, s51] Published Wed May 15, 2024

Categories: Physics

Isometric tensor network optimization for extensive Hamiltonians is free of barren plateaus

PRA: Quantum information - Tue, 2024-05-14 12:00

Author(s): Qiang Miao and Thomas Barthel

Strongly correlated quantum many-body systems from condensed matter and particle physics are very hard to study classically and variational quantum algorithms (VQAs) may be hampered by barren plateaus, where energy gradients decay exponentially in the system size. The authors prove that this critical problem can be resolved by employing VQAs based on suitable isometric tensor network states, establishing a new route for the investigation of strongly correlated quantum matter on NISQ devices.


[Phys. Rev. A 109, L050402] Published Tue May 14, 2024

Categories: Journals, Physics

Higher-Form Symmetries under Weak Measurement

Author(s): Kaixiang Su, Nayan Myerson-Jain, Chong Wang, Chao-Ming Jian, and Cenke Xu

We aim to address the following question: if we start with a quantum state with a spontaneously broken higher-form symmetry, what is the fate of the system under weak local quantum measurements? We demonstrate that under certain conditions, a phase transition can be driven by weak measurements, whic…


[Phys. Rev. Lett. 132, 200402] Published Tue May 14, 2024

Categories: Journals, Physics

Experimental Quantum Homomorphic Encryption Using a Quantum Photonic Chip

Author(s): Yuan Li, Lin Cao, Wei Luo, Hui Zhang, Hong Cai, Muhammad Faeyz Karim, Feng Gao, Joseph Fitzsimons, Qinghua Song, and Ai-Qun Liu

Quantum fully homomorphic encryption is shown to be feasible on a compact silicon photonic chip, improving the prospects of a scalable, programmable, and stable quantum network infrastructure.


[Phys. Rev. Lett. 132, 200801] Published Tue May 14, 2024

Categories: Journals, Physics
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