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Quantum Information—Dedicated to Professor Gilles Brassard on the Occasion of His 70th Birthday

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

Deadline for manuscript submissions: 30 September 2026 | Viewed by 1034

Special Issue Editors


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Guest Editor
1. Hefei National Research Center for Physical Sciences at the Microscale and School of Physical Sciences, University of Science and Technology of China, Hefei, China
2. CAS Center for Excellence in Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei, China
3. Hefei National Laboratory, University of Science and Technology of China, Hefei, China
Interests: quantum foundations; quantum communication; quantum computing

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Guest Editor
1. Centre for Quantum Technologies, Mathematical Institute, University of Oxford, Oxford, UK
2. Centre for Quantum Technologies, National University of Singapore, Singapore
Interests: quantum cryptography; quantum computation

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Guest Editor
Institute for Quantum Science and Technology, University of Calgary, Calgary, AB, Canada
Interests: quantum information; quantum control and metrology; nonlinear quantum optics; algorithmic quantum simulation

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Guest Editor
1. Hefei National Research Center for Physical Sciences at the Microscale and School of Physical Sciences, University of Science and Technology of China, Hefei, China
2. CAS Center for Excellence in Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei, China
3. Hefei National Laboratory, University of Science and Technology of China, Hefei, China
Interests: quantum information; quantum communication; quantum sensing

Special Issue Information

Dear Colleagues,

Professor Gilles Brassard’s visionary work has fundamentally established the cornerstone of modern quantum information science. His seminal contributions—including the co-invention of quantum cryptography (notably the BB84 protocol), quantum teleportation, entanglement distillation, and the development of information theoretical security frameworks—have successfully transformed abstract quantum principles into practical and powerful technologies. By seamlessly connecting profound theoretical concepts with experimental feasibility, his research has not only defined but also continuously propelled the entire field forward, inspiring generations of researchers and shaping the trajectory of quantum information research.

This Special Issue, dedicated in honour of Professor Brassard’s 70th birthday, aims to assemble a collection of invitation-only, high-quality articles that reflect the remarkable breadth, depth, and enduring influence of his scientific legacy. Topics of interest encompass, but are not limited to:

  • Quantum cryptography and key establishment
  • Device-independent quantum information processing
  • Quantum communication and networks
  • Quantum entanglement and nonlocality
  • Quantum algorithms and computational foundations
  • Quantum teleportation and remote state preparation
  • Quantum randomness generation and certification
  • Intersections of quantum information and cryptography
  • Quantum foundations
  • Quantum networks and the future of secure communications

The Special Issue welcomes submissions of comprehensive reviews, perspectives, and tutorial papers that not only synthesize recent advances but also critically engage with the intellectual heritage of Professor Brassard's seminal work. Original research articles presenting landmark results and demonstrating substantial potential impact are also strongly encouraged.

Prof. Dr. Jian-Wei Pan
Prof. Dr. Artur Ekert
Prof. Dr. Barry C. Sanders
Prof. Dr. Feihu Xu
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 communication
  • quantum algorithms
  • quantum repeaters
  • quantum network
  • quantum foundations
  • quantum random number generation

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Published Papers (1 paper)

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Research

10 pages, 2411 KB  
Article
Entanglement Swapping Enables the Practical Security of Quantum Cryptography
by Yang-Fan Jiang, Liang Huang, Yu-Zhe Zhang, Likang Zhang, Qi-Chao Sun, Zheng-Ping Li, Hao Li, Weijun Zhang, Lixing You, Feihu Xu, Qiang Zhang and Jian-Wei Pan
Entropy 2026, 28(5), 518; https://doi.org/10.3390/e28050518 - 4 May 2026
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Abstract
Entanglement is one of the most striking phenomena in quantum physics, playing important roles in fundamental physics and quantum information science. It enables a secure means of communication—quantum cryptography—and builds up the foundation of its unconditional security. Entanglement-based quantum cryptography has received great [...] Read more.
Entanglement is one of the most striking phenomena in quantum physics, playing important roles in fundamental physics and quantum information science. It enables a secure means of communication—quantum cryptography—and builds up the foundation of its unconditional security. Entanglement-based quantum cryptography has received great attention from the early demonstrations to the recent remarkable achievements. In a practical scenario, although entanglement-based quantum cryptography can provide inherent source-independent security, its detection side has been shown to be vulnerable to external probing attacks. Here we show that entanglement swapping can effectively solve this critical issue, enabling a side-channel-free quantum cryptography.Entanglement swapping allows each user’s quantum state preparation and detection in a completely private station, which is immune to any external probing side channels. We demonstrate the entanglement-swapping quantum cryptography scheme in the field based on two independent entanglement photon sources. Based on the remote entangled photon pairs, we implement the Ekert-1991 protocol under a channel attenuation equivalent to 100 km of standard optical fiber, achieving a Bell violation value of S=2.659±0.092 and a secret key rate of 0.0163 bit/s. While recent device-independent QKD demonstrations have reached 100 km using atoms or ions, our photonic ES-QKD offers a complementary, all-optical pathway that is directly compatible with existing fiber networks and quantum repeaters. Full article
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