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Entropy
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Quantum Entanglement and Its Application in Quantum Communication
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Quantum Entanglement and Its Application in Quantum Communication

A special issue of Entropy (ISSN 1099-4300). This special issue belongs to the section "Quantum Information".

Deadline for manuscript submissions: closed (20 November 2023) | Viewed by 3612

Special Issue Editor

Dr. Austin Lund

E-Mail Website
Guest Editor
1. Dahlem Center for Complex Quantum Systems, Freie Universität Berlin, 14195 Berlin, Germany
2. Centre for Quantum Computation & Communication Technology, School of Mathematics & Physics, The University of Queensland, St. Lucia, QLD 4072, Australia
Interests: quantum optics; quantum information; linear optical quantum computing; entanglement distillation; computational complexity

Special Issue Information

Dear Colleagues,

Quantum entanglement was initially presented, over eighty years ago by Einstein, Podolsky and Rosen, as a fundamental problem in the theory of quantum mechanics.  In the years since this problem was presented, we have studied it, measured it and now want to use it as a resource for communicating quantum information. As quantum entanglement is fundamentally described through distant correlations, the study of entropy measures and information theory has naturally been utilized in the study of quantum entanglement.  The aim of this Special Issue is to disseminate the latest advances in the generation, utilization and quantification of quantum entanglement, enabling the communication of quantum information. Experimental quantum technologies are rapidly approaching the performance of ideal theoretical models. We are therefore moving towards an era where interconnected networks of quantum entanglement are a practical reality. This Special Issue is a timely opportunity to present results that will shape the future of quantum communications networks. Topics that this Special Issue will be interested in include theoretical and experimental results in entanglement generation, entanglement distillation, entanglement measures and resource theory, entanglement-based quantum cryptography, the storage of entanglement over long distances, the verification and quantification of quantum entanglement, and protocols for the utilization of quantum entanglement over long distances.

Dr. Austin Lund
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Entropy is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • quantum entanglement
  • quantum communication
  • quantum information theory
  • entanglement measures
  • entanglement distillation
  • quantum cryptography
  • quantum key distribution
  • quantum optics
  • quantum memory
  • bell inequalities
  • quantum protocols

Published Papers (3 papers)

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Research

16 pages, 431 KiB  
Article
Tighter Constraints of Multi-Qubit Entanglement in Terms of Nonconvex Entanglement Measures LCREN and LCRENoA
by Zhongxi Shen, Dongping Xuan, Wen Zhou, Zhixi Wang and Shao-Ming Fei
Entropy 2024, 26(2), 127; https://doi.org/10.3390/e26020127 - 31 Jan 2024
Viewed by 660
Abstract
The monogamy property of entanglement is an intriguing feature of multipartite quantum entanglement. Most entanglement measures satisfying the monogamy inequality have turned out to be convex. Whether nonconvex entanglement measures obey the monogamy inequalities remains less known at present. As a well-known measure [...] Read more.
The monogamy property of entanglement is an intriguing feature of multipartite quantum entanglement. Most entanglement measures satisfying the monogamy inequality have turned out to be convex. Whether nonconvex entanglement measures obey the monogamy inequalities remains less known at present. As a well-known measure of entanglement, the logarithmic negativity is not convex. We elucidate the constraints of multi-qubit entanglement based on the logarithmic convex-roof extended negativity (LCREN) and the logarithmic convex-roof extended negativity of assistance (LCRENoA). Using the Hamming weight derived from the binary vector associated with the distribution of subsystems, we establish monogamy inequalities for multi-qubit entanglement in terms of the αth-power (α≥4ln2) of LCREN, and polygamy inequalities utilizing the αth-power (0≤α≤2) of LCRENoA. We demonstrate that these inequalities give rise to tighter constraints than the existing ones. Furthermore, our monogamy inequalities are shown to remain valid for the high-dimensional states that violate the CKW monogamy inequality. Detailed examples are presented to illustrate the effectiveness of our results in characterizing the multipartite entanglement distributions. Full article
(This article belongs to the Special Issue Quantum Entanglement and Its Application in Quantum Communication)
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15 pages, 3705 KiB  
Article
Investigation of the JPA-Bandwidth Improvement in the Performance of the QTMS Radar
by Milad Norouzi, Jamileh Seyed-Yazdi, Seyed Mohammad Hosseiny and Patrizia Livreri
Entropy 2023, 25(10), 1368; https://doi.org/10.3390/e25101368 - 22 Sep 2023
Cited by 1 | Viewed by 785
Abstract
Josephson parametric amplifier (JPA) engineering is a significant component in the quantum two-mode squeezed radar (QTMS) to enhance, for instance, radar performance and the detection range or bandwidth. We simulated a proposal of using engineered JPA (EJPA) to enhance the performance of a [...] Read more.
Josephson parametric amplifier (JPA) engineering is a significant component in the quantum two-mode squeezed radar (QTMS) to enhance, for instance, radar performance and the detection range or bandwidth. We simulated a proposal of using engineered JPA (EJPA) to enhance the performance of a QTMS radar. We defined the signal-to-noise ratio (SNR) and detection range equations of the QTMS radar. The engineered JPA led to a remarkable improvement in the quantum radar performance, i.e., a large enhancement in SNR of about 6 dB more than the conventional QTMS radar (with respect to the latest version of the QTMS radar and not to the classical radar), a substantial improvement in the probability of detection through far fewer channels. The important point in this work was that we expressed the importance of choosing suitable detectors for the QTMS radars. Finally, we simulated the transmission of the signal to the target in the QTMS radar and obtained a huge increase in the QTMS radar range, up to 482 m in the current study. Full article
(This article belongs to the Special Issue Quantum Entanglement and Its Application in Quantum Communication)
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16 pages, 1750 KiB  
Article
Entanglement of Signal Paths via Noisy Superconducting Quantum Devices
by Wenbo Shi and Robert Malaney
Entropy 2023, 25(1), 153; https://doi.org/10.3390/e25010153 - 12 Jan 2023
Cited by 1 | Viewed by 1436
Abstract
Quantum routers will provide for important functionality in emerging quantum networks, and the deployment of quantum routing in real networks will initially be realized on low-complexity (few-qubit) noisy quantum devices. A true working quantum router will represent a new application for quantum entanglement—the [...] Read more.
Quantum routers will provide for important functionality in emerging quantum networks, and the deployment of quantum routing in real networks will initially be realized on low-complexity (few-qubit) noisy quantum devices. A true working quantum router will represent a new application for quantum entanglement—the coherent superposition of multiple communication paths traversed by the same quantum signal. Most end-user benefits of this application are yet to be discovered, but a few important use-cases are now known. In this work, we investigate the deployment of quantum routing on low-complexity superconducting quantum devices. In such devices, we verify the quantum nature of the routing process as well as the preservation of the routed quantum signal. We also implement quantum random access memory, a key application of quantum routing, on these same devices. Our experiments then embed a five-qubit quantum error-correcting code within the router, outlining the pathway for error-corrected quantum routing. We detail the importance of the qubit-coupling map for a superconducting quantum device that hopes to act as a quantum router, and experimentally verify that optimizing the number of controlled-X gates decreases hardware errors that impact routing performance. Our results indicate that near-term realization of quantum routing using noisy superconducting quantum devices within real-world quantum networks is possible. Full article
(This article belongs to the Special Issue Quantum Entanglement and Its Application in Quantum Communication)
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