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New Advances in Quantum Communications and Quantum Computing

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

Deadline for manuscript submissions: 31 December 2025 | Viewed by 715

Special Issue Editors


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Guest Editor
Department of Electrical Engineering, Computer Engineering and Informatics, Cyprus University of Technology, 3036 Limassol, Cyprus
Interests: quantum key distribution; quantum communications

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Guest Editor
Clarendon Laboratory, Department of Physics, University of Oxford, Oxford, UK
Interests: quantum computing

Special Issue Information

Dear Colleagues,

By harnessing the power of fundamental quantum properties, such as entanglement and superposition, quantum technologies are transforming the future of communications, computation, information theory, metrology, and sensing. In recent years, quantum communications and quantum computing have been at the forefront of this quantum revolution, with advancements aiming to enable unconditional, yet practical, secure exchange of data and complex problem solving far beyond classical limits.

In quantum communications, innovations in quantum key distribution, photonic integrated circuits, satellite-based and entanglement-based links, and quantum repeaters are accelerating the realisation of high-performance, large-scale secure networks. At the same time, researchers in quantum computing push the boundaries of both hardware and algorithms, aiming to overcome challenges in scalability, error correction, and coherence times in order to unlock the full potential of quantum computation. The two fields are also slowly coming together for the deployment of a fully fledged quantum Internet.

This Special Issue aims to bring together cutting-edge research on the latest theoretical advancements and experimental breakthroughs in quantum communications and quantum computing. We invite contributions that tackle fundamental challenges, explore novel implementations, and foster interdisciplinary approaches that will shape the next era of quantum technology.

Dr. Mariella Minder
Prof. David Lucas
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 250 words) can be sent to the Editorial Office for assessment.

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 key distribution
  • quantum computing
  • quantum networks
  • quantum communication infrastructure
  • postquantum cryptography
  • quantum algorithms
  • quantum information theory

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Published Papers (2 papers)

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Research

18 pages, 1190 KB  
Article
Three-Basis Loop-Back QKD: A Passive Architecture for Secure and Scalable Quantum Mobile Networks
by Luis Adrián Lizama-Pérez and Patricia Morales-Calvo
Entropy 2025, 27(12), 1249; https://doi.org/10.3390/e27121249 - 11 Dec 2025
Viewed by 105
Abstract
The Loop-Back Quantum Key Distribution (LB-QKD) protocol establishes a bidirectional architecture in which a single photon travels forth and back through the same optical channel. Unlike conventional one-way schemes such as BB84, Alice performs both state preparation and measurement, while Bob acts as [...] Read more.
The Loop-Back Quantum Key Distribution (LB-QKD) protocol establishes a bidirectional architecture in which a single photon travels forth and back through the same optical channel. Unlike conventional one-way schemes such as BB84, Alice performs both state preparation and measurement, while Bob acts as a passive polarization modulator and reflector. This design eliminates detectors at Bob’s side, minimizes synchronization requirements, and enables compact, low-power implementations suitable for quantum-mobile and IoT platforms. An extended three-basis configuration {X,Y,Z} is introduced, preserving the simplicity of the two-basis scheme while improving noise tolerance through enhanced orthogonality-based filtering. Analytical modeling shows that the effective protocol error decreases from Eprotocol(2)=e/2 to Eprotocol(3)=e/3, achieving a 33% improvement in noise resilience. Despite its slightly lower sifting efficiency (η=1/6), the total information gain reaches G=0.26 bits per pulse, maintaining post-sifting throughput comparable to BB84. The protocol doubles the tolerable QBER of conventional QKD, sustaining secure operation up to 22% for two bases and approximately 47.58% for three bases. Its passive, self-verifying architecture enhances resistance to man-in-the-middle, photon-number-splitting, and side-channel attacks, providing a scalable and energy-efficient framework for secure key distribution and authentication in next-generation mobile and distributed quantum networks. Full article
(This article belongs to the Special Issue New Advances in Quantum Communications and Quantum Computing)
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15 pages, 793 KB  
Article
Quantum Digital Signature Using Entangled States for Network
by Changho Hong, Youn-Chang Jeong, Osung Kwon and Se-Wan Ji
Entropy 2025, 27(11), 1179; https://doi.org/10.3390/e27111179 - 20 Nov 2025
Viewed by 320
Abstract
We propose an entanglement-based quantum digital signature (QDS) protocol optimized for quantum networks. The protocol follows the Lamport-inspired QDS paradigm but eliminates QKD post-processing by signing and verifying with raw conclusive keys, thereby reducing latency and implementation complexity. We provide a finite-size security [...] Read more.
We propose an entanglement-based quantum digital signature (QDS) protocol optimized for quantum networks. The protocol follows the Lamport-inspired QDS paradigm but eliminates QKD post-processing by signing and verifying with raw conclusive keys, thereby reducing latency and implementation complexity. We provide a finite-size security analysis of robustness, unforgeability, and non-repudiation. Under standard fiber-loss and detector models, simulations show a consistent signature rate advantage over a representative Lamport-inspired QDS baseline across metro-to-regional distances. The proposed protocol is practical for near-term deployment while preserving end-to-end, finite key security guarantees. Full article
(This article belongs to the Special Issue New Advances in Quantum Communications and Quantum Computing)
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