Physics

Neutrinos from dense environments: Flavor mechanisms, theoretical approaches, observations, and new directions

Reviews of Modern Physics - Mon, 2024-06-24 12:00

Author(s): M. Cristina Volpe

Neutrinos can change flavors due to their nonzero masses and mixings as well as their interactions with matter and other neutrinos. In dense astrophysical environments, such as core-collapse supernovae or neutron star mergers, the problem of neutrino flavor evolution becomes very complex. Connections to other domains such as quantum information theory have been uncovered. Understanding the neutrino flavor evolution in dense environments can shed light on the dynamics of massive star explosions and the origin of heavy elements in the Universe and is important for future observations of supernova neutrinos.


[Rev. Mod. Phys. 96, 025004] Published Mon Jun 24, 2024

Categories: Journals, Physics

Violation of a Leggett-Garg Inequality Using Ideal Negative Measurements in Neutron Interferometry

Author(s): Elisabeth Kreuzgruber, Richard Wagner, Niels Geerits, Hartmut Lemmel, and Stephan Sponar

Leggett-Garg inequalities (LGIs) have been proposed in order to assess how far the predictions of quantum mechanics defy “macroscopic realism.” With LGIs, correlations of measurements performed on a single system at different times are described. We report on an experiment that demonstrates the viol…


[Phys. Rev. Lett. 132, 260201] Published Mon Jun 24, 2024

Categories: Journals, Physics

Can MRI Help Elucidate Iron-Based Neurotoxicity?

APS Physics - Mon, 2024-06-24 12:00

Author(s): Gary Zabow

A new technique combining magnetic resonance imaging and x-ray fluorescence can characterize, with single-neuron resolution, the presence of toxic forms of iron that might be associated with neurodegenerative diseases.


[Physics 17, 101] Published Mon Jun 24, 2024

Categories: Physics

Doubling the order of approximation via the randomized product formula

PRA: Quantum information - Mon, 2024-06-24 12:00

Author(s): Chien-Hung Cho, Dominic W. Berry, and Min-Hsiu Hsieh

Hamiltonian simulation is a major application of quantum computing, for example, enabling prediction of the properties of molecules. Prior work has used product formulas with randomization to improve performance, but has only yielded modest improvements over the excellent performance provided by det…


[Phys. Rev. A 109, 062431] Published Mon Jun 24, 2024

Categories: Journals, Physics

Estimate of the time required to perform a nonadiabatic holonomic quantum computation

PRA: Quantum information - Mon, 2024-06-24 12:00

Author(s): Ole Sönnerborn

Nonadiabatic holonomic quantum computation has been proposed as a method to implement quantum logic gates with robustness comparable to that of adiabatic holonomic gates but with shorter execution times. In this paper, we establish an isoholonomic inequality for quantum gates, which provides a lower…


[Phys. Rev. A 109, 062433] Published Mon Jun 24, 2024

Categories: Journals, Physics

Nonreciprocity detector arrays for high-efficiency detection of itinerant microwave photons

PRA: Quantum information - Mon, 2024-06-24 12:00

Author(s): Suirong He, Penghui Ouyang, Haiyan Gao, Yufen Li, Jiaxing He, and L. F. Wei

Microwave single-photon detection is one of the critical tasks for the implementation of the desired microwave quantum information processing. Given the detection efficiency of the demonstrated microwave single-photon detector is still very limited, here, we propose a nonreciprocity detector array t…


[Phys. Rev. A 109, 062430] Published Mon Jun 24, 2024

Categories: Journals, Physics

Resonator-qutrit quantum battery

PRA: Quantum information - Mon, 2024-06-24 12:00

Author(s): Fang-Mei Yang and Fu-Quan Dou

Quantum batteries (QBs) are energy storage and transfer microdevices that open up new possibilities in energy technology. Here, we derive a resonator–multiple-qutrit quantum battery (QB) model consisting of a multimode resonator and N superconducting transmon qutrits. We investigate the charging and…


[Phys. Rev. A 109, 062432] Published Mon Jun 24, 2024

Categories: Journals, Physics

Quantum Nonlocality: Multicopy Resource Interconvertibility and Their Asymptotic Inequivalence

Author(s): Subhendu B. Ghosh, Snehasish Roy Chowdhury, Guruprasad Kar, Arup Roy, Tamal Guha, and Manik Banik

Quantum nonlocality, pioneered in Bell’s seminal work and subsequently verified through a series of experiments, has drawn substantial attention due to its practical applications in various protocols. Evaluating and comparing the extent of nonlocality within distinct quantum correlations holds signi…


[Phys. Rev. Lett. 132, 250205] Published Fri Jun 21, 2024

Categories: Journals, Physics

Quantum Information Spreading in Generalized Dual-Unitary Circuits

Author(s): Alessandro Foligno, Pavel Kos, and Bruno Bertini

We study the spreading of quantum information in a recently introduced family of brickwork quantum circuits that generalizes the dual-unitary class. These circuits are unitary in time, while their spatial dynamics is unitary only in a restricted subspace. First, we show that local operators spread a…


[Phys. Rev. Lett. 132, 250402] Published Fri Jun 21, 2024

Categories: Journals, Physics

Theory of Compression Channels for Postselected Quantum Metrology

Author(s): Jing Yang

The postselected quantum metrological scheme is especially advantageous when the final measurements are either very noisy or expensive in practical experiments. In this Letter, we put forward a general theory on the compression channels in postselected quantum metrology. We define the basic notions …


[Phys. Rev. Lett. 132, 250802] Published Fri Jun 21, 2024

Categories: Journals, Physics

Atomic Spreading Produces Novel Superconductors

APS Physics - Fri, 2024-06-21 12:00

Author(s): Michael Schirber

A liquid-like spreading of metal atoms on a topological material can generate a superconductor—one that might benefit quantum computing.


[Physics 17, 100] Published Fri Jun 21, 2024

Categories: Physics

Network Science Applied to Urban Transportation

APS Physics - Fri, 2024-06-21 12:00

Author(s): Ryan Wilkinson

A simple model based on network theory can reproduce the complex structures seen in urban transportation networks.


[Physics 17, s70] Published Fri Jun 21, 2024

Categories: Physics

One Field to Rule Them All

APS Physics - Fri, 2024-06-21 12:00

Author(s): Robert Garisto

Theorists explain why cosmic inflation might appear to be driven by a single inflaton field, even if it had actually been driven by two or more such fields.


[Physics 17, s78] Published Fri Jun 21, 2024

Categories: Physics

Comment on “Saturating quantum advantages in postselected metrology with the positive Kirkwood-Dirac distribution”

PRA: Quantum information - Fri, 2024-06-21 12:00

Author(s): David R. M. Arvidsson-Shukur, Crispin H. W. Barnes, Hugo V. Lepage, Seth Lloyd, Noah Lupu-Gladstein, Wilfred Salmon, and Flavio Salvati

In a recent paper [Das, Modak, and Bera, Phys. Rev. A 107, 042413 (2023)], Das et al. claim that Kirkwood-Dirac negativity is not required to achieve anomalous values of the quantum Fisher information encoded in postselected (filtered) particles. We argue that this claim is wrong. Further, we show t…


[Phys. Rev. A 109, 066401] Published Fri Jun 21, 2024

Categories: Journals, Physics

Reply to “Comment on ‘Saturating quantum advantages in postselected metrology with the positive Kirkwood-Dirac distribution' ”

PRA: Quantum information - Fri, 2024-06-21 12:00

Author(s): Sourav Das, Subhrajit Modak, and Manabendra Nath Bera

In Das et al. [Phys. Rev. A 107, 042413 (2023)], we showed that Kirkwood-Dirac negativity is not necessary to achieve anomalous quantum Fisher information. Arvidsson-Shukur et al. [preceding Comment, Phys. Rev. A (to be published)] claim that one of our conclusions is wrong. Here, we argue that the …


[Phys. Rev. A 109, 066402] Published Fri Jun 21, 2024

Categories: Journals, Physics

Parameter shift rule with optimal phase selection

PRA: Quantum information - Fri, 2024-06-21 12:00

Author(s): Liubov Markovich, Savvas Malikis, Stefano Polla, and Jordi Tura

Parameter shift rules enable the estimation of the derivatives of expectation values with respect to the dynamical evolution of a state. Thus, they provide a valuable tool in variational optimization and insight into the dynamical behavior of quantum systems. Constructing parameter shift rules appli…


[Phys. Rev. A 109, 062429] Published Fri Jun 21, 2024

Categories: Journals, Physics

Robust Quantum Gates against Correlated Noise in Integrated Quantum Chips

Author(s): Kangyuan Yi, Yong-Ju Hai, Kai Luo, Ji Chu, Libo Zhang, Yuxuan Zhou, Yao Song, Song Liu, Tongxing Yan, Xiu-Hao Deng, Yuanzhen Chen, and Dapeng Yu

As quantum circuits become more integrated and complex, additional error sources that were previously insignificant start to emerge. Consequently, the fidelity of quantum gates benchmarked under pristine conditions falls short of predicting their performance in realistic circuits. To overcome this p…


[Phys. Rev. Lett. 132, 250604] Published Thu Jun 20, 2024

Categories: Journals, Physics

Wide-Band Unambiguous Quantum Sensing via Geodesic Evolution

Author(s): Ke Zeng, Xiaohui Yu, Martin B. Plenio, and Zhen-Yu Wang

We present a quantum sensing technique that utilizes a sequence of π pulses to cyclically drive the qubit dynamics along a geodesic path of adiabatic evolution. This approach effectively suppresses the effects of both decoherence noise and control errors while simultaneously removing unwanted resona…


[Phys. Rev. Lett. 132, 250801] Published Thu Jun 20, 2024

Categories: Journals, Physics

Elusive Clock Transition in Strontium Revealed

APS Physics - Thu, 2024-06-20 12:00

Author(s): Marric Stephens

Researchers have measured a hard-to-observe electronic transition in strontium that was predicted six decades ago.


[Physics 17, s72] Published Thu Jun 20, 2024

Categories: Physics

Multiparticle entanglement classification with the ergotropic gap

PRA: Quantum information - Thu, 2024-06-20 12:00

Author(s): Xue Yang, Yan-Han Yang, Shao-Ming Fei, and Ming-Xing Luo

The presence of quantum multipartite entanglement implies the existence of a thermodynamic quantity known as the ergotropic gap, which is defined as the difference between the maximal global and local extractable works from the system. We establish a direct relation between the geometric measure of …


[Phys. Rev. A 109, 062427] Published Thu Jun 20, 2024

Categories: Journals, Physics
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