Special Issue "Long-Distance Quantum Communications"

A special issue of Entropy (ISSN 1099-4300).

Deadline for manuscript submissions: closed (30 September 2019).

Special Issue Editors

Prof. Dr. Christoph Simon
E-Mail Website
Guest Editor
Institute for Quantum Science and Technology and Department of Physics and Astronomy, University of Calgary, Calgary, AB T2N 1N4, Canada
Interests: quantum optics; quantum information processing; quantum networks
Dr. Giuseppe Vallone
E-Mail Website
Guest Editor
Department of Information Engineering, University of Padova, 35131 Padova, Italy
Interests: quantum optics; quantum communication and information; quantum key distribution
Dr. David Elkouss
E-Mail Website
Guest Editor
Research and Development in Quantum Technology (QuTech), Technical University of Delft, 2628 CD Delft, The Netherlands
Interests: error correcting codes; capacities of quantum channels; quantum key distribution; distributed quantum computation
Dr. Mohsen Razavi
E-Mail Website
Guest Editor
School of Electronic and Electrical Engineering, University of Leeds, UK
Interests: quantum communications; quantum key distribution; quantum communications networks; quantum repeaters; optical communications

Special Issue Information

Dear Colleagues,

Quantum Information science is at a crucial phase of becoming a technology. Recent advances in fiber-based, through-the-air, and satellite quantum key distribution (QKD), entanglement distribution, and quantum teleportation, as well as the tremendous progress in the development of quantum processing and quantum storage tools has brought us closer to full deployment of quantum technologies at large scales. Perhaps, one of the key required advancements is to improve the reach of quantum systems, especially those designed to enable secure communications in the quantum era. In this regard, systems such as quantum repeaters and satellite quantum communication have been proposed to achieve long-distance quantum communications. We would like to invite you to submit your original theoretical and/or experimental contributions to this Special Issue on long-distance quantum communications. Topics of interest include (but are not limited to):

  • Long-distance quantum key distribution;
  • Quantum networks and quantum repeaters;
  • Quantum memories;
  • Entanglement distillation and relevant quantum error correction techniques;
  • Satellite-based quantum communications;
  • Quantum Internet and quantum applications therein.

Prof. Dr. Christoph Simon
Dr. Giuseppe Vallone
Dr. David Elkouss
Dr. Mohsen Razavi
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 papers will be 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 1800 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.


  • quantum communications
  • quantum networks
  • quantum key distribution
  • quantum repeaters
  • satellite-based quantum communications
  • quantum memories

Published Papers (1 paper)

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Open AccessArticle
Satellite Quantum Communications When Man-in-the-Middle Attacks Are Excluded
Entropy 2019, 21(4), 387; https://doi.org/10.3390/e21040387 - 10 Apr 2019
Cited by 2 | Viewed by 1820
An application of quantum communications is the transmission of qubits to create shared symmetric encryption keys in a process called quantum key distribution (QKD). Contrary to public-private key encryption, symmetric encryption is considered safe from (quantum) computing attacks, i.e. it provides forward security [...] Read more.
An application of quantum communications is the transmission of qubits to create shared symmetric encryption keys in a process called quantum key distribution (QKD). Contrary to public-private key encryption, symmetric encryption is considered safe from (quantum) computing attacks, i.e. it provides forward security and is thus attractive for secure communications. In this paper we argue that for free-space quantum communications, especially with satellites, if one assumes that man-in-the-middle attacks can be detected by classical channel monitoring techniques, simplified quantum communications protocols and hardware systems can be implemented that offer improved key rates. We term these protocols photon key distribution (PKD) to differentiate them from the standard QKD protocols. We identify three types of photon sources and calculate asymptotic secret key rates for PKD protocols and compare them to their QKD counterparts. PKD protocols use only one measurement basis which we show roughly doubles the key rates. Furthermore, with the relaxed security assumptions one can establish keys at very high losses, in contrast to QKD where at the same losses privacy amplification would make key generation impossible. Full article
(This article belongs to the Special Issue Long-Distance Quantum Communications)
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