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Measurement Dependence can Affect Security in a Quantum Network 测量依赖性会影响量子网络的安全性
IF 2.2 4区 物理与天体物理 Q2 PHYSICS, MULTIDISCIPLINARY Pub Date : 2024-09-10 DOI: 10.1002/andp.202400123
Amit Kundu, Debasis Sarkar

Network Nonlocality is an advanced study of quantum nonlocality that comprises network structure beyond Bell's theorem. The development of quantum networks has the potential to bring a lot of technological applications in several quantum information processing tasks. Here, the focus is on how the role of the independence of the measurement choices by the end parties in a network works and can be used to affect the security in a quantum network. In both three-parties two-sources bilocal network and four-parties three-sources star network scenarios, this study is able to show, a practical way to understand the relaxation of the assumptions to enhance a real security protocol if someone wants to breach in a network communication. Theoretically, it have been proved that by relaxing the independence of the measurement choices of only one end party, a Standard Network Nonlocality (SNN) and more stronger Full Network Nonlocality (FNN) can be created and the maximum quantum violation by the classical no-signalling local model can be obtained. The distinguish between two types of network nonlocality, SNN and FNN, can also be made. It has been shown that FNN is a stronger correlation than SNN in the sense that the former comes in a scenario where all the sources must be nonlocal in nature.

网络非局域性是对量子非局域性的高级研究,包括超越贝尔定理的网络结构。量子网络的发展有可能在多项量子信息处理任务中带来大量技术应用。这里的重点是网络终端各方测量选择的独立性如何发挥作用,以及如何用来影响量子网络的安全性。在三方两源双局域网络和四方三源星型网络两种情况下,本研究都能以实用的方式说明,如果有人想破坏网络通信,如何通过放宽假设来增强真实的安全协议。理论上,研究证明,通过放宽只有一个终端方测量选择的独立性,可以创建标准网络非局域性(SNN)和更强的全网络非局域性(FNN),并获得经典无信令局部模型的最大量子违规。我们还可以区分 SNN 和 FNN 两种网络非局域性。研究表明,FNN 是一种比 SNN 更强的相关性,因为前者是在所有来源都必须是非局域的情况下产生的。
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引用次数: 0
Masthead: Ann. Phys. 9/2024 刊头Ann.9/2024
IF 2.2 4区 物理与天体物理 Q2 PHYSICS, MULTIDISCIPLINARY Pub Date : 2024-09-09 DOI: 10.1002/andp.202470021
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引用次数: 0
(Ann. Phys. 9/2024) (Ann. Phys. 9/2024)
IF 2.2 4区 物理与天体物理 Q2 PHYSICS, MULTIDISCIPLINARY Pub Date : 2024-09-09 DOI: 10.1002/andp.202470020

Reflection and Transmission of Airy Pulse from Controllable Periodic Temporal Boundary

The images on the cover show interaction between strong and weak Airy pulses for smaller (upper image) and larger (lower image) delays between them. Soliton emerging from strong Airy pulse acts as a periodic temporal boundary for the weak pulse that suffers reflection and/or transmission at the boundary. For further details and characteristics, see the study by Deependra Singh Gaur and Akhilesh Kumar Mishra in article number 2400141.

封面上的图像显示了强 Airy 脉冲和弱 Airy 脉冲在较小延迟(上图)和较大延迟(下图)时的相互作用。强 Airy 脉冲产生的孤子是弱脉冲的周期性时间边界,弱脉冲在边界处受到反射和/或透射。更多详情和特征,请参阅 Deependra Singh Gaur 和 Akhilesh Kumar Mishra 的研究,文章编号为 2400141。
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引用次数: 0
Design of a 10.8 to 34.6 GHz Ultra-Wideband Transparent Metamaterial Absorber Using an Equivalent Circuit Model 利用等效电路模型设计 10.8 至 34.6 GHz 超宽带透明超材料吸收器
IF 2.2 4区 物理与天体物理 Q2 PHYSICS, MULTIDISCIPLINARY Pub Date : 2024-09-08 DOI: 10.1002/andp.202400107
Yongxi Cai, Jiaqing Liu, Jizhe Zhang, Xiao Li, Daxing Dong, Xiaogang Yin, Yangyang Fu, Youwen Liu

In this paper, an ultra-wideband metamaterial absorber (UWMA) is proposed and demonstrated by using a transparent and flexible sandwich structure, which consists of a top patterned double-square loop (DSL) of conductive film, the polymer interlayer, the bottom conductive film. The work presents the UWMA's equivalent circuit model for a macroscopic analysis of its physical mechanism. Further, optimizing UWMA's structural parameters using this equivalent circuit model can greatly enhance its efficiency. The absorption coefficient of the designed structure achieves over 90% within the wide frequency range from 10.82  to 34.59 GHz due to the overlapping of three absorption bands. The experimental results indicate that the absorption coefficient of the fabricated structure exceeds 60% in the frequency range of 10.45–35.28 GHz, and reaches 90% in the majority of frequency range of 10.71–28.51 GHz, while its averaged optical transparency in the visible spectrum exceeds 75%. The UWMA achieves high transparency due to a small ratio of the surface area occupied by the ITO pattern to the total area and realizes multiple-resonance ultra-wideband absorption with conformality while maintaining a thickness of only 2.2 mm, which has diverse applications in the field of electromagnetics, including aircraft stealth, transparent chambers, and flexible electronic screens.

本文提出并演示了一种超宽带超材料吸收器(UWMA),它采用透明柔性夹层结构,由顶部图案化的导电薄膜双方环(DSL)、聚合物夹层和底部导电薄膜组成。作品提出了 UWMA 的等效电路模型,对其物理机制进行了宏观分析。此外,利用该等效电路模型优化 UWMA 的结构参数可大大提高其效率。由于三个吸收带的重叠,设计结构的吸收系数在 10.82 至 34.59 GHz 的宽频率范围内达到 90% 以上。实验结果表明,所制结构在 10.45-35.28 GHz 频率范围内的吸收系数超过了 60%,在 10.71-28.51 GHz 的大部分频率范围内达到了 90%,而其在可见光谱中的平均光学透明度超过了 75%。由于 ITO 图案所占表面积与总面积之比很小,UWMA 实现了高透明度,并在保持仅 2.2 毫米厚度的同时,实现了具有保形性的多共振超宽带吸收,在飞机隐形、透明腔室和柔性电子屏幕等电磁学领域具有广泛应用。
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引用次数: 0
On Regular Negative Mass Black Holes Under Unitary Time and Proper Antichronous Transformations 论单位时间和适当反时空变换下的常规负质量黑洞
IF 2.2 4区 物理与天体物理 Q2 PHYSICS, MULTIDISCIPLINARY Pub Date : 2024-09-04 DOI: 10.1002/andp.202400139
Manuel Uruena Palomo

A non-singular black hole solution is briefly presented which violates energy conditions only at its interior by postulating a consistent shift to negative energies and gravitationally repulsive negative masses at the event horizon. This shift is the unitary parity-time PT$PT$ transformation of relativistic quantum mechanics and the proper antichronous transformation of the full Lorentz group. The transformation at the event horizon respects Einstein's equivalence principle, and the considered negative mass interaction does not result in the runaway motion paradox or vacuum instability. The correspondence of these regular black holes with observed ones is studied by proposing another mechanism of black hole growth independent of accretion and merging due to interior increasing entropy, which attempts to solve the unexplained size and formation of high-redshift supermassive black holes, the intermediate mass gap, and the information paradox.

本文简要介绍了一种非正弦黑洞解法,它仅在内部违反能量条件,假定事件视界一致地转向负能量和引力排斥负质量。这种转变是相对论量子力学的单位奇偶性-时间变换,也是全洛伦兹群的适当反时间变换。事件视界处的变换遵守了爱因斯坦的等效原理,所考虑的负质量相互作用不会导致失控运动悖论或真空不稳定性。研究了这些规则黑洞与观测到的黑洞的对应关系,提出了黑洞生长的另一种机制,它独立于内部熵增加导致的吸积和合并,试图解决高红移超大质量黑洞的大小和形成、中间质量差距和信息悖论等无法解释的问题。
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引用次数: 0
Low-Energy Spin Manipulation Using Ferromagnetism 利用铁磁性进行低能自旋操纵
IF 2.2 4区 物理与天体物理 Q2 PHYSICS, MULTIDISCIPLINARY Pub Date : 2024-09-04 DOI: 10.1002/andp.202400226
Valentin Desbuis, Daniel Lacour, Coriolan Tiusan, Wolfgang Weber, Michel Hehn

The manipulation of the electron spin direction at very low electron energies is demonstrated by exploiting the exchange field present within a magnetic thin film. The design of the lab-on-chip integrated magnetic tunnel transistor allows  to test different magnetic materials. The variation of film thickness, exchange field strength or electron energy are shown to have an impact on the resulting spin direction of electrons crossing a ferromagnetic material. A controlled engineering of the exchange field in thin magnetic films can therefore serve as a basis of future devices enabling controlled spin manipulation.

通过利用磁性薄膜内存在的交换场,展示了在极低电子能量下对电子自旋方向的操控。片上实验室集成磁隧道晶体管的设计可以测试不同的磁性材料。结果表明,薄膜厚度、交换场强度或电子能量的变化会影响电子穿过铁磁材料时的自旋方向。因此,磁性薄膜中交换场的可控工程可作为未来可控自旋操纵设备的基础。
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引用次数: 0
Energy Localization and Topological Defect in Spherical Non-Hermitian Topolectrical Circuits 球面非赫米提拓扑电路中的能量定位和拓扑缺陷
IF 2.2 4区 物理与天体物理 Q2 PHYSICS, MULTIDISCIPLINARY Pub Date : 2024-08-31 DOI: 10.1002/andp.202400026
Xizhou Shen, Xiumei Wang, Haotian Guo, Xingping Zhou

This work examines the energy localization in non-Hermitian systems, with a particular focus on the influence of topological defects in spherical models. Alterations in the mode distribution are explored within non-Hermitian Su-Schrieffer-Heeger (SSH) chains affected by these defects, utilizing the Maximum Skin Corner Weight (MaxWSC) metric. An innovative spherical model is introduced, created by segmenting spheres into 1D chain structures, to study the non-Hermitian skin effect (NHSE) within a spherical geometric framework. Experimental validations conducted on Printed Circuit Boards (PCBs) corroborate the theoretical insights. These findings not only substantiate the theoretical approach but also illustrate the capability of engineered circuit systems to mimic complex non-Hermitian phenomena, highlighting the utility of spherical geometries in exploring NHSE and topological phenomena in non-Hermitian systems.

这项研究考察了非ermitian 系统中的能量定位,尤其关注球形模型中拓扑缺陷的影响。利用最大表皮角权(MaxWSC)度量,探讨了受这些缺陷影响的非ermitian Su-Schrieffer-Heeger (SSH) 链中模式分布的变化。通过将球体分割成一维链结构,引入了一个创新的球形模型,以研究球形几何框架内的非ermitian 蒙皮效应 (NHSE)。在印刷电路板(PCB)上进行的实验验证证实了这一理论见解。这些发现不仅证实了理论方法,还说明了工程电路系统模仿复杂非ermitian 现象的能力,突出了球形几何在探索非ermitian 系统中的 NHSE 和拓扑现象方面的实用性。
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引用次数: 0
Quantum Correlation Enhanced with Quantum Coherent Feedback Control in a Cavity-magnon Hybrid System 利用腔磁混合系统中的量子相干反馈控制增强量子相关性
IF 2.2 4区 物理与天体物理 Q2 PHYSICS, MULTIDISCIPLINARY Pub Date : 2024-08-30 DOI: 10.1002/andp.202400221
Yue-Han Lin, Ya-Qin Lin, Zhi-Ying Lin, Rong-Can Yang, Hong-Yu Liu

A scheme is proposed to enhance quantum correlation, including entanglement and steering, for two magnon modes in a cavity-magnon hybrid system through coherent quantum feedback. The hybrid system consists of a microwave cavity and two YIG spheres, which incorporates a nonlinear flux-driven Josephson parametric amplifier in order for the generation of two photons within the cavity simultaneously. A quantum coherent feedback loop is used for the reduction of effective dissipation. By modulating feedback parameters, optimal bipartite and tripartite entanglement, as well as quantum steering are derived. Importantly, compared with the same setup without coherent feedback, the proposed scheme significantly improves quantum correlation. Furthermore, by optimizing the feedback reflectivity and the ratio of cavity-magnon coupling strength, the enhancement of asymmetric steering can be controlled. Notably, incorporating the feedback loop effectively increase its robustness against thermal noise, thus the scheme offer better prospect for experimental development. This study paves the way for advancements in quantum information processing and quantum entanglement within cavity-magnonics.

本文提出了一种方案,通过相干量子反馈来增强腔体-磁子混合系统中两个磁子模式的量子相关性,包括纠缠和转向。该混合系统由一个微波腔和两个 YIG 球组成,其中包含一个非线性通量驱动约瑟夫森参量放大器,以便在腔内同时产生两个光子。量子相干反馈回路用于减少有效耗散。通过调制反馈参数,得出了最佳的双方和三方纠缠以及量子转向。重要的是,与没有相干反馈的相同设置相比,所提出的方案显著提高了量子相关性。此外,通过优化反馈反射率和腔磁耦合强度比,可以控制非对称转向的增强。值得注意的是,加入反馈回路能有效提高其对热噪声的鲁棒性,因此该方案具有更好的实验发展前景。这项研究为在腔磁学中推进量子信息处理和量子纠缠铺平了道路。
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引用次数: 0
Research Progress of Femtosecond Laser-Printed Perovskite Quantum Dots in Amorphous Glass 非晶玻璃中飞秒激光打印 Perovskite 量子点的研究进展
IF 2.2 4区 物理与天体物理 Q2 PHYSICS, MULTIDISCIPLINARY Pub Date : 2024-08-30 DOI: 10.1002/andp.202400152
Han Xiao, Lingwei Zeng, Lei Lei, Daqin Chen

Lead halide perovskite quantum dots (PeQDs) have garnered increasing attention due to their extraordinary optoelectronic properties. In recent years, femtosecond (fs) laser direct writing shows to be an effective way of inducing localized crystallization of PeQDs inside glass matrix while remaining their structural stability and optical performance. This article reviews the research progress on fs laser irradiation-induced nucleation/growth of PeQDs in glass and discusses the latest advancements in the use of the technology for optical data storage, micrometer-scale light-emitting diode (LED), information security protection, and other related fields. It offers novel insights and perspectives for exploring new functionality and device application of fs laser-printed PeQDs glass composite structures.

卤化铅过氧化物量子点(PeQDs)因其非凡的光电特性而受到越来越多的关注。近年来,飞秒(fs)激光直写显示出是一种在玻璃基质内诱导 PeQDs 局部结晶的有效方法,同时还能保持其结构稳定性和光学性能。本文回顾了fs激光辐照诱导玻璃中PeQDs成核/生长的研究进展,并讨论了该技术在光学数据存储、微米级发光二极管(LED)、信息安全保护及其他相关领域应用的最新进展。它为探索fs激光打印PeQDs玻璃复合结构的新功能和器件应用提供了新的见解和视角。
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引用次数: 0
Topological Optical Waveguiding of Exciton-Polariton Condensates 激子-极化子凝聚态的拓扑光波导
IF 2.2 4区 物理与天体物理 Q2 PHYSICS, MULTIDISCIPLINARY Pub Date : 2024-08-27 DOI: 10.1002/andp.202400229
J. Beierlein, O. A. Egorov, P. Gagel, T. H. Harder, A. Wolf, M. Emmerling, S. Betzold, F. Jabeen, L. Ma, S. Höfling, U. Peschel, S. Klembt

1D models with topological non-trivial band structures are a simple and effective way to study novel and exciting concepts in topological photonics. In this work, the propagation of light-matter quasi-particles, so-called exciton-polaritons, is studied in waveguide arrays. Specifically, topological states are being investigated at the interface between dimer chains, characterized by a non-zero winding number. In order to exercise precise control over the polariton propagation, non-resonant laser excitation, as well as resonant excitation, are studied in transmission geometry. The results highlight a new platform for the study of quantum fluids of light and non-linear optical propagation effects in coupled semiconductor waveguides.

具有拓扑非三维带状结构的一维模型是研究拓扑光子学中令人兴奋的新概念的一种简单而有效的方法。在这项工作中,研究了光-物质准粒子(即所谓的激子-极化子)在波导阵列中的传播。具体来说,研究的是二聚体链界面的拓扑状态,其特点是缠绕数不为零。为了精确控制极化子的传播,在传输几何中研究了非共振激光激发和共振激发。研究结果为研究光量子流体和耦合半导体波导中的非线性光学传播效应提供了一个新平台。
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引用次数: 0
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