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Entropy
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Editorial Board Members' Collection Series on Quantum Entanglement
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Editorial Board Members' Collection Series on Quantum Entanglement

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

Deadline for manuscript submissions: 15 October 2024 | Viewed by 3603

Special Issue Editors

Prof. Dr. Xiang-Bin Wang

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Guest Editor
Department of Physics, Tsinghua University, Beijing 100084, China
Interests: quantum information; quantum communication; quantum key distribution; quantum cryptography
Special Issues, Collections and Topics in MDPI journals
Prof. Dr. Richard D. Gill

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Guest Editor
Mathematical Institute, Leiden University, Postbus 9512, 2300 RA Leiden, The Netherlands
Interests: biostatistics; genetics; survival analysis; semiparametric models; causality; machine learning; statistical image analysis and quantum statistical information; foundational aspects of statistics, probability and quantum physics
Special Issues, Collections and Topics in MDPI journals
Prof. Dr. Francesco De Martini

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Guest Editor
CNR, Institute for Photonics and Nanotechnologies, 00156 Rome, Italy
Interests: quantum information; cosmology
Dr. Hendra Nurdin

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Guest Editor
School of Electrical Engineering and Telecommunications, University of New South Wales (UNSW), Sydney, NSW 2052, Australia
Interests: quantum feedback control; quantum stochastic dynamics; open quantum systems; quantum optics; nonlinear systems; nonlinear control
Prof. Dr. Yujun Zheng

E-Mail Website
Guest Editor
School of Physics, Shandong University, Jinan 250100, China
Interests: quantum dynamics; photon statistics; spectroscopy and control of single quantum systems; quantum dot scintillation dynamics; ultrafast dynamics of atomic and molecular systems
Special Issues, Collections and Topics in MDPI journals
Dr. Agostino Migliore

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Guest Editor
Department of Chemical Sciences, University of Padua, Via Francesco Marzolo, 1, 35131 Padova, PD, Italy
Interests: quantum chemistry; quantum dynamics in condensed phases; nanoscale electronics; charge, energy, and information transfer; matter–radiation interaction
Special Issues, Collections and Topics in MDPI journals
Prof. Antonino Messina

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Guest Editor
Department of Mathematics and Computer Science, University of Palermo, 90133 Palermo, PA, Italy
Interests: quantum electrodynamics; open systems; time dependent spin Hamiltonians; quantum and semiclassical Rabi models
Special Issues, Collections and Topics in MDPI journals
Dr. Alessandro Sergi

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Guest Editor
Dipartimento di Scienze Matematiche e Informatiche, Scienze Fisiche e Scienze della Terra, Università degli Studi di Messina, Viale Stagno d’Alcontres 31, 98166 Messina, Italy
Interests: quantum-classical hybrid systems; non-Hermitian quantum mechanics; non-Hamiltonian systems; open quantum systems; quantum-biology
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Quantum entanglement, as the main topic of the 2022 Nobel Prize, has played the central role in quantum information processing.

This Special Issue, entitled “Quantum Entanglement”, is a collection of articles regarding the fundamental properties, manipulation, and application of quantum entanglement. The issue covers, but is not limited to, the following topics:

  • Entanglement-based quantum communication;
  • Quantum teleportation;
  • Device-independent quantum key distribution;
  • Quantum repeaters;
  • High-quality entanglement techniques;
  • Entanglement generation and purification;
  • Entanglement-assisted quantum computing;
  • Boson sampling and Gaussian sampling;
  • NISQ.

Prof. Dr. Xiang-Bin Wang
Prof. Dr. Richard D. Gill
Prof. Dr. Francesco De Martini
Dr. Hendra Nurdin
Prof. Dr. Yujun Zheng
Dr. Agostino Migliore
Prof. Antonino Messina
Dr. Alessandro Sergi
Guest Editors

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 key distribution
  • quantum communication

Published Papers (3 papers)

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Research

12 pages, 468 KiB  
Communication
Optimal Estimation of Quantum Coherence by Bell State Measurement: A Case Study
by Yuan Yuan, Xufeng Huang, Yueping Niu and Shangqing Gong
Entropy 2023, 25(10), 1459; https://doi.org/10.3390/e25101459 - 17 Oct 2023
Cited by 1 | Viewed by 854
Abstract
Quantum coherence is the most distinguished feature of quantum mechanics. As an important resource, it is widely applied to quantum information technologies, including quantum algorithms, quantum computation, quantum key distribution, and quantum metrology, so it is important to develop tools for efficient estimation [...] Read more.
Quantum coherence is the most distinguished feature of quantum mechanics. As an important resource, it is widely applied to quantum information technologies, including quantum algorithms, quantum computation, quantum key distribution, and quantum metrology, so it is important to develop tools for efficient estimation of the coherence. Bell state measurement plays an important role in quantum information processing. In particular, it can also, as a two-copy collective measurement, directly measure the quantum coherence of an unknown quantum state in the experiment, and does not need any optimization procedures, feedback, or complex mathematical calculations. In this paper, we analyze the performance of estimating quantum coherence with Bell state measurement for a qubit case from the perspective of semiparametric estimation and single-parameter estimation. The numerical results show that Bell state measurement is the optimal measurement for estimating several frequently-used coherence quantifiers, and it has been demonstrated in the perspective of the quantum limit of semiparametric estimation and Fisher information. Full article
(This article belongs to the Special Issue Editorial Board Members' Collection Series on Quantum Entanglement)
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8 pages, 1781 KiB  
Article
Local Entanglement of Electrons in 1D Hydrogen Molecule
by Ivan P. Christov
Entropy 2023, 25(9), 1308; https://doi.org/10.3390/e25091308 - 08 Sep 2023
Viewed by 884
Abstract
The quantum entanglement entropy of the electrons in a one-dimensional hydrogen molecule is quantified locally using an appropriate partitioning of the two-dimensional configuration space. Both the global and the local entanglement entropy exhibit a monotonic increase when increasing the inter-nuclear distance, while the [...] Read more.
The quantum entanglement entropy of the electrons in a one-dimensional hydrogen molecule is quantified locally using an appropriate partitioning of the two-dimensional configuration space. Both the global and the local entanglement entropy exhibit a monotonic increase when increasing the inter-nuclear distance, while the local entropy remains peaked in the middle between the nuclei with its width decreasing. Our findings show that at the inter-nuclear distance where a stable hydrogen molecule is formed, the quantum entropy shows no peculiarity thus indicating that the entropy and the energy measures display different sensitivity with respect to the interaction between the two identical electrons involved. One possible explanation is that the calculation of the quantum entropy does not account explicitly for the distance between the nuclei, which contrasts to the total energy calculation where the energy minimum depends decisively on that distance. The numerically exact and the time-dependent quantum Monte Carlo calculations show close results. Full article
(This article belongs to the Special Issue Editorial Board Members' Collection Series on Quantum Entanglement)
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23 pages, 701 KiB  
Article
A Survey of Universal Quantum von Neumann Architecture
by Yuan-Ting Liu, Kai Wang, Yuan-Dong Liu and Dong-Sheng Wang
Entropy 2023, 25(8), 1187; https://doi.org/10.3390/e25081187 - 09 Aug 2023
Cited by 1 | Viewed by 1162
Abstract
The existence of universal quantum computers has been theoretically well established. However, building up a real quantum computer system not only relies on the theory of universality, but also needs methods to satisfy requirements on other features, such as programmability, modularity, scalability, etc. [...] Read more.
The existence of universal quantum computers has been theoretically well established. However, building up a real quantum computer system not only relies on the theory of universality, but also needs methods to satisfy requirements on other features, such as programmability, modularity, scalability, etc. To this end, here we study the recently proposed model of quantum von Neumann architecture by putting it in a practical and broader setting, namely, the hierarchical design of a computer system. We analyze the structures of quantum CPU and quantum control units and draw their connections with computational advantages. We also point out that a recent demonstration of our model would require less than 20 qubits. Full article
(This article belongs to the Special Issue Editorial Board Members' Collection Series on Quantum Entanglement)
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