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Entropy
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Quantum Entanglement and Quantum Computer
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Quantum Entanglement and Quantum Computer

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

Deadline for manuscript submissions: closed (15 May 2023) | Viewed by 9035

Special Issue Editors

Dr. Mahmoud Abdel-Aty

E-Mail Website
Guest Editor
Mathematics Department, Sohag University, Sohag 1646130, Egypt
Interests: entropy; entanglement; quantum machine learning; quantum algorithms; geometric phase
Dr. Hichem Eleuch

E-Mail Website
Guest Editor
Department of Applied Physics and Astronomy, University of Sharjah, Sharjah 26666, United Arab Emirates
Interests: physics; applied physics; quantum computing; matter–radiation interactions; condensed matter physics; mathematical physics; complex systems and applications
Dr. Abdel-Haleem Abdel-Aty

E-Mail Website
Guest Editor
Physics Department, College of Sciences, University of Bisha, Bisha 67714, Saudi Arabia
Interests: acceleration control; code division multiple access; digital signal-processing chips; electric current control; induction motor drives; learning systems; logic gates; machine control; neurocontrollers; next-generation networks; optical fibre networks; optical transceivers; quality of service; radiofrequency interference; semiconductor optical amplifiers; starting thyristors; torque control

Special Issue Information

Dear Colleagues,

An enormous amount has happened in Quantum Computers and Quantum Information and, on 4 October 2022, the Royal Swedish Academy of Sciences decided to award the Nobel Prize in Physics 2022 to Alain Aspect, Institut d’Optique Graduate School – Université Paris-.

Saclay and École Polytechnique, Palaiseau, France, John F. Clauser, J.F. Clauser & Assoc., Walnut Creek, CA, USA and Anton Zeilinger, University of Vienna, Austria “for experiments with entangled photons, establishing the violation of Bell inequalities and pioneering quantum information science” Entangled states – from theory to technology.

In this Special Issue, we intend to invite front-line researchers and authors to submit original research and review articles on exploring quantum computers, quantum information, quantum computation and quantum entanglement. Potential topics include, but are not limited to:

  • Quantum Computer
  • Quantum Computations
  • Dynamics of quantum entanglement
  • Quantum entanglement of moving bodies
  • Quantum entanglement in fermionic lattices
  • Quantum Fractional Calculus
  • Frequency standards with quantum entanglement
  • Methods for detection of quantum entanglement
  • Quantum entanglement of a large number of photons
  • Evolution equation for quantum entanglement

Dr. Mahmoud Abdel-Aty
Dr. Hichem Eleuch
Dr. Abdel-Haleem Abdel-Aty
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 fractional calculus
  • entropy
  • entanglement
  • quantum machine learning
  • quantum algorithms
  • geometric phase
  • quantum computations

Published Papers (3 papers)

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Research

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15 pages, 3739 KiB  
Article
Entanglement Swapping and Swapped Entanglement
by Sultan M. Zangi, Chitra Shukla, Atta ur Rahman and Bo Zheng
Entropy 2023, 25(3), 415; https://doi.org/10.3390/e25030415 - 25 Feb 2023
Cited by 5 | Viewed by 2630
Abstract
Entanglement swapping is gaining widespread attention due to its application in entanglement distribution among different parts of quantum appliances. We investigate the entanglement swapping for pure and noisy systems, and argue different entanglement quantifiers for quantum states. We explore the relationship between the [...] Read more.
Entanglement swapping is gaining widespread attention due to its application in entanglement distribution among different parts of quantum appliances. We investigate the entanglement swapping for pure and noisy systems, and argue different entanglement quantifiers for quantum states. We explore the relationship between the entanglement of initial states and the average entanglement of final states in terms of concurrence and negativity. We find that if initial quantum states are maximally entangled and we make measurements in the Bell basis, then average concurrence and average negativity of final states give similar results. In this case, we simply obtain the average concurrence (average negativity) of the final states by taking the product of concurrences (negativities) of the initial states. However, the measurement in non-maximally entangled basis during entanglement swapping degrades the average swapped entanglement. Further, the product of the entanglement of the initial mixed states provides an upper bound to the average swapped entanglement of final states obtained after entanglement swapping. The negativity work well for weak entangled noisy states but concurrence gives better results for relatively strong entanglement regimes. We also discuss how successfully the output state can be used as a channel for the teleportation of an unknown qubit. Full article
(This article belongs to the Special Issue Quantum Entanglement and Quantum Computer)
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12 pages, 413 KiB  
Article
Entanglement Negativity and Concurrence in Some Low-Dimensional Spin Systems
by Leonardo S. Lima
Entropy 2022, 24(11), 1629; https://doi.org/10.3390/e24111629 - 10 Nov 2022
Cited by 2 | Viewed by 1340
Abstract
The influence of magnon bands on entanglement in the antiferromagnetic XXZ model on a triangular lattice, which models the bilayer structure consisting of an antiferromagnetic insulator and normal metal, is investigated. This effect was studied in ferromagnetic as well as antiferromagnetic triangular lattices. [...] Read more.
The influence of magnon bands on entanglement in the antiferromagnetic XXZ model on a triangular lattice, which models the bilayer structure consisting of an antiferromagnetic insulator and normal metal, is investigated. This effect was studied in ferromagnetic as well as antiferromagnetic triangular lattices. Quantum entanglement measures given by the entanglement negativity have been studied, where a magnon current is induced in the antiferromagnet due to interfacial exchange coupling between localized spins in the antiferromagnet and itinerant electrons in a normal metal. Moreover, quantum correlations in other frustrated models, namely the metal-insulation antiferromagnetic bilayer model and the Heisenberg model with biquadratic and bicubic interactions, are analyzed. Full article
(This article belongs to the Special Issue Quantum Entanglement and Quantum Computer)
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Review

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17 pages, 599 KiB  
Review
SoK: Benchmarking the Performance of a Quantum Computer
by Junchao Wang, Guoping Guo and Zheng Shan
Entropy 2022, 24(10), 1467; https://doi.org/10.3390/e24101467 - 14 Oct 2022
Cited by 6 | Viewed by 4594
Abstract
The quantum computer has been claimed to show more quantum advantage than the classical computer in solving some specific problems. Many companies and research institutes try to develop quantum computers with different physical implementations. Currently, most people only focus on the number of [...] Read more.
The quantum computer has been claimed to show more quantum advantage than the classical computer in solving some specific problems. Many companies and research institutes try to develop quantum computers with different physical implementations. Currently, most people only focus on the number of qubits in a quantum computer and consider it as a standard to evaluate the performance of the quantum computer intuitively. However, it is quite misleading in most times, especially for investors or governments. This is because the quantum computer works in a quite different way than classical computers. Thus, quantum benchmarking is of great importance. Currently, many quantum benchmarks are proposed from different aspects. In this paper, we review the existing performance benchmarking protocols, models, and metrics. We classify the benchmarking techniques into three categories: physical benchmarking, aggregative benchmarking, and application-level benchmarking. We also discuss the future trend for quantum computer’s benchmarking and propose setting up the QTOP100. Full article
(This article belongs to the Special Issue Quantum Entanglement and Quantum Computer)
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