Special Issue "Quantum Communications and Quantum Networks"

A special issue of Applied Sciences (ISSN 2076-3417). This special issue belongs to the section "Quantum Science and Technology".

Deadline for manuscript submissions: 31 July 2020.

Special Issue Editors

Dr. Davide Bacco
E-Mail Website
Guest Editor
Department of Photonics Engineering, High-Speed Optical Communication Centre of Excellence for Silicon Photonics for Optical Communications, Technical University of Denmark, Ørsteds Plads, Building: 340, 1.13.E, 2800 Kgs. Lyngby, Denmark
Interests: quantum communications; high-dimensional quantum communications; quantum cryptography; silicon photonics for quantum communications
Dr. Guilherme B. Xavier
E-Mail Website
Guest Editor
Department of Electrical Engineering, Linköping University, SE-581 83 Linköping, Sweden
Interests: experimental quantum communications; quantum key distribution; propagation of entanglement; optical fibers and associated optoelectronic instrumentation
Dr. Rui Lin
E-Mail Website
Guest Editor
Chalmers University of Technology, SE-412 96 Gothenburg, Sweden
Interests: high-speed optical communication and network; digital signal processing; quantum key distribution; cyber security

Special Issue Information

Dear Colleagues,

Quantum networks are the ultimate target in quantum communication, where many connected users can share information carried by quantum systems. The keystones of such structures are the reliable generation, transmission, and manipulation of quantum states. Two-dimensional quantum states, qubits, are steadily adopted as information units. However, high-dimensional quantum states, qudits, constitute a richer resource for future quantum networks, exceeding the limitations imposed by the ubiquitous qubits.

We are inviting you to submit to this Special Issue papers discussing quantum communication in its broadest sense. The scope of the Special Issue includes (among others) high-dimensional quantum communication, high-dimensional entanglement generation, teleportation, quantum cryptography, quantum error correction, and co-existence between quantum and classical light within the same channels.

Dr. Davide Bacco
Dr. Guilherme B. Xavier
Dr. Rui Lin
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. Applied Sciences is an international peer-reviewed open access semimonthly 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.

Keywords

  • Quantum communications
  • Quantum cryptography
  • High dimensional quantum communication
  • Co-existence quantum and classical signal

Published Papers (4 papers)

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Research

Open AccessArticle
Continuous Variable Quantum Secret Sharing with Fairness
Appl. Sci. 2020, 10(1), 189; https://doi.org/10.3390/app10010189 - 25 Dec 2019
Abstract
The dishonest participants have many advantages to gain others’ shares by cheating in quantum secret sharing (QSS) protocols. However, the traditional methods such as identity authentication and message authentication can not resolve this problem due to the reason that the share has already [...] Read more.
The dishonest participants have many advantages to gain others’ shares by cheating in quantum secret sharing (QSS) protocols. However, the traditional methods such as identity authentication and message authentication can not resolve this problem due to the reason that the share has already been released to dishonest participants before realizing the deception. In this paper, a continuous variable QSS (CVQSS) scheme is proposed with fairness which ensures all participants can acquire or can not acquire the secret simultaneously. The quantum channel based on two-mode squeezing states provides secure communications through which it can send shares successfully, as long as setting the squeezing and modulation parameters according to the quantum channel transmission efficiency and the Shannon information of shares. In addition, the Chinese Remainder Theorem (CRT) can provides tunable threshold structures according to demands of the complex quantum network and the strategy for fairness can be incorporated with other sharing schemes, resulting in perfect compatibility for practical implementations. Full article
(This article belongs to the Special Issue Quantum Communications and Quantum Networks)
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Open AccessArticle
Performance Analysis of the Shore-to-Reef Atmospheric Continuous-Variable Quantum Key Distribution
Appl. Sci. 2019, 9(24), 5285; https://doi.org/10.3390/app9245285 - 04 Dec 2019
Abstract
The effects of sea salt concluded in oceanic atmosphere are ubiquitous in practical wireless optical links. Here a shore-to-reef atmospheric continuous-variable quantum key distribution (CVQKD) model is established on the basis of Mie scattering theory, with the aim to characterize the complex case [...] Read more.
The effects of sea salt concluded in oceanic atmosphere are ubiquitous in practical wireless optical links. Here a shore-to-reef atmospheric continuous-variable quantum key distribution (CVQKD) model is established on the basis of Mie scattering theory, with the aim to characterize the complex case of beam propagation in the atmosphere caused by sea salt particles. The effects on performance of shore-to-reef atmospheric CVQKD under the sea salt particles and relative humidity are also studied. Simulation results show that the increase of particle radius and relative humidity will lead to the degeneration of secret key rate. Extending the channel distance also reduces the secret key rate. This paper provides a basis for the establishment of practical shore-to-reef atmospheric CVQKD model. The research of this paper also gives momentous reference for the study of optical communication channel models with other suspended particles over the ocean. Full article
(This article belongs to the Special Issue Quantum Communications and Quantum Networks)
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Open AccessArticle
Security Analysis of Discrete-Modulated Continuous-Variable Quantum Key Distribution over Seawater Channel
Appl. Sci. 2019, 9(22), 4956; https://doi.org/10.3390/app9224956 - 18 Nov 2019
Abstract
We investigate the optical absorption and scattering properties of four different kinds of seawater as the quantum channel. The models of discrete-modulated continuous-variable quantum key distribution (CV-QKD) in free-space seawater channel are briefly described, and the performance of the four-state protocol and the [...] Read more.
We investigate the optical absorption and scattering properties of four different kinds of seawater as the quantum channel. The models of discrete-modulated continuous-variable quantum key distribution (CV-QKD) in free-space seawater channel are briefly described, and the performance of the four-state protocol and the eight-state protocol in asymptotic and finite-size cases is analyzed in detail. Simulation results illustrate that the more complex is the seawater composition, the worse is the performance of the protocol. For different types of seawater channels, we can improve the performance of the protocol by selecting different optimal modulation variances and controlling the extra noise on the channel. Besides, we can find that the performance of the eight-state protocol is better than that of the four-state protocol, and there is little difference between homodyne detection and heterodyne detection. Although the secret key rate of the protocol that we propose is still relatively low and the maximum transmission distance is only a few hundred meters, the research on CV-QKD over the seawater channel is of great significance, which provides a new idea for the construction of global secure communication network. Full article
(This article belongs to the Special Issue Quantum Communications and Quantum Networks)
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Open AccessArticle
Continuous-Variable Quantum Key Distribution Robust Against Polarization-Dependent Loss
Appl. Sci. 2019, 9(18), 3937; https://doi.org/10.3390/app9183937 - 19 Sep 2019
Abstract
Polarization is one of the physical characteristics of optical waves, and the polarization-division-multiplexing (PDM) scheme has gained much attraction thanks to its capability of achieving high transmission rate. In the PDM-based quantum key distribution (QKD), the key information could be encoded independently by [...] Read more.
Polarization is one of the physical characteristics of optical waves, and the polarization-division-multiplexing (PDM) scheme has gained much attraction thanks to its capability of achieving high transmission rate. In the PDM-based quantum key distribution (QKD), the key information could be encoded independently by the optical fields E x and E y , where the 2-dimensional modulation and orthogonal polarization multiplexing usually result in two-fold channel capacity. Unfortunately, the non-negligible polarization-dependent loss (PDL) caused by the crystal dichroism in optical devices may result in the signal distortion, leading to an imbalanced optical signal-to-noise ratio. Here, we present a polarization-pairwise coding (PPC) scheme for the PDM-based continuous-variable (CV) QKD systems to overcome the PDL problem. Numerical simulation results indicate that the PDL-induced performance degradation can be mitigated. In addition, the PPC scheme, tailored to be robust against a high level of PDL, offers a suitable solution to improve the performance of the PDM-based CVQKD in terms of the secret key rate and maximal transmission distance. Full article
(This article belongs to the Special Issue Quantum Communications and Quantum Networks)
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