Special Issue "Quantum Communication—Celebrating the Silver Jubilee of Teleportation"

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

Deadline for manuscript submissions: closed (15 June 2018).

Special Issue Editors

Guest Editor
Mr. Rotem Liss Website E-Mail
Department of Computer Science, Technion–Israel Institute of Technology, Haifa 3200003, Israel
Interests: quantum information; quantum cryptography; quantum communication
Lead Guest Editor
Prof. Tal Mor Website E-Mail
Department of Computer Science, Technion–Israel Institute of Technology, Haifa 3200003, Israel
Interests: quantum information; quantum computation; quantum cryptography; quantum communication (theory and implementations)

Special Issue Information

[call for paper published on 28 November 2017]

Dear Colleagues,

Quantum communication is the study of communication between two or more participants using quantum information resources and notions, such as qubits, superposition, interference, entanglement, non-locality, teleportation, decoherence, and more. In particular, we are celebrating here the silver jubilee to quantum teleportation, which is one of the pillars (along with the Einstein-Podolsky-Rosen paradox and Bell's inequality) of quantum communication.

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 other topics) entanglement, teleportation, quantum (and beyond-quantum) non-locality, quantum communication complexity, quantum cryptography, quantum error correction, and quantum channels.

Mr. Rotem Liss
Guest Editor

Prof. Tal Mor
Lead Guest Editor

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 1600 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.

In case you consider to (potentially) submit a paper to this Special Issue, please inform the Guest Editors by e-mail by the end of March 2018. Your reply would be highly appreciated. Our goal is that this Special Issue will contain about 10–20 well-written papers of good scientific quality.

Keywords

  • Quantum communication
  • Quantum information
  • Quantum cryptography

Published Papers (6 papers)

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Research

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Open AccessFeature PaperArticle
Entanglement 25 Years after Quantum Teleportation: Testing Joint Measurements in Quantum Networks
Entropy 2019, 21(3), 325; https://doi.org/10.3390/e21030325 - 26 Mar 2019
Cited by 7
Abstract
Twenty-five years after the invention of quantum teleportation, the concept of entanglement gained enormous popularity. This is especially nice to those who remember that entanglement was not even taught at universities until the 1990s. Today, entanglement is often presented as a resource, the [...] Read more.
Twenty-five years after the invention of quantum teleportation, the concept of entanglement gained enormous popularity. This is especially nice to those who remember that entanglement was not even taught at universities until the 1990s. Today, entanglement is often presented as a resource, the resource of quantum information science and technology. However, entanglement is exploited twice in quantum teleportation. Firstly, entanglement is the “quantum teleportation channel”, i.e., entanglement between distant systems. Second, entanglement appears in the eigenvectors of the joint measurement that Alice, the sender, has to perform jointly on the quantum state to be teleported and her half of the “quantum teleportation channel”, i.e., entanglement enabling entirely new kinds of quantum measurements. I emphasize how poorly this second kind of entanglement is understood. In particular, I use quantum networks in which each party connected to several nodes performs a joint measurement to illustrate that the quantumness of such joint measurements remains elusive, escaping today’s available tools to detect and quantify it. Full article
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Open AccessFeature PaperArticle
Remote Sampling with Applications to General Entanglement Simulation
Entropy 2019, 21(1), 92; https://doi.org/10.3390/e21010092 - 19 Jan 2019
Abstract
We show how to sample exactly discrete probability distributions whose defining parameters are distributed among remote parties. For this purpose, von Neumann’s rejection algorithm is turned into a distributed sampling communication protocol. We study the expected number of bits communicated among the parties [...] Read more.
We show how to sample exactly discrete probability distributions whose defining parameters are distributed among remote parties. For this purpose, von Neumann’s rejection algorithm is turned into a distributed sampling communication protocol. We study the expected number of bits communicated among the parties and also exhibit a trade-off between the number of rounds of the rejection algorithm and the number of bits transmitted in the initial phase. Finally, we apply remote sampling to the simulation of quantum entanglement in its essentially most general form possible, when an arbitrary finite number m of parties share systems of arbitrary finite dimensions on which they apply arbitrary measurements (not restricted to being projective measurements, but restricted to finitely many possible outcomes). In case the dimension of the systems and the number of possible outcomes per party are bounded by a constant, it suffices to communicate an expected O ( m 2 ) bits in order to simulate exactly the outcomes that these measurements would have produced on those systems. Full article
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Open AccessFeature PaperArticle
A Classical Interpretation of the Scrooge Distribution
Entropy 2018, 20(8), 619; https://doi.org/10.3390/e20080619 - 20 Aug 2018
Abstract
The Scrooge distribution is a probability distribution over the set of pure states of a quantum system. Specifically, it is the distribution that, upon measurement, gives up the least information about the identity of the pure state compared with all other distributions that [...] Read more.
The Scrooge distribution is a probability distribution over the set of pure states of a quantum system. Specifically, it is the distribution that, upon measurement, gives up the least information about the identity of the pure state compared with all other distributions that have the same density matrix. The Scrooge distribution has normally been regarded as a purely quantum mechanical concept with no natural classical interpretation. In this paper, we offer a classical interpretation of the Scrooge distribution viewed as a probability distribution over the probability simplex. We begin by considering a real-amplitude version of the Scrooge distribution for which we find that there is a non-trivial but natural classical interpretation. The transition to the complex-amplitude case requires a step that is not particularly natural but that may shed light on the relation between quantum mechanics and classical probability theory. Full article
Open AccessArticle
Attacks against a Simplified Experimentally Feasible Semiquantum Key Distribution Protocol
Entropy 2018, 20(7), 536; https://doi.org/10.3390/e20070536 - 18 Jul 2018
Cited by 3
Abstract
A semiquantum key distribution (SQKD) protocol makes it possible for a quantum party and a classical party to generate a secret shared key. However, many existing SQKD protocols are not experimentally feasible in a secure way using current technology. An experimentally feasible SQKD [...] Read more.
A semiquantum key distribution (SQKD) protocol makes it possible for a quantum party and a classical party to generate a secret shared key. However, many existing SQKD protocols are not experimentally feasible in a secure way using current technology. An experimentally feasible SQKD protocol, “classical Alice with a controllable mirror” (the “Mirror protocol”), has recently been presented and proved completely robust, but it is more complicated than other SQKD protocols. Here we prove a simpler variant of the Mirror protocol (the “simplified Mirror protocol”) to be completely non-robust by presenting two possible attacks against it. Our results show that the complexity of the Mirror protocol is at least partly necessary for achieving robustness. Full article
Open AccessArticle
Probabilistic Teleportation of Arbitrary Two-Qubit Quantum State via Non-Symmetric Quantum Channel
Entropy 2018, 20(4), 238; https://doi.org/10.3390/e20040238 - 29 Mar 2018
Cited by 3
Abstract
Quantum teleportation has significant meaning in quantum information. In particular, entangled states can also be used for perfectly teleporting the quantum state with some probability. This is more practical and efficient in practice. In this paper, we propose schemes to use non-symmetric quantum [...] Read more.
Quantum teleportation has significant meaning in quantum information. In particular, entangled states can also be used for perfectly teleporting the quantum state with some probability. This is more practical and efficient in practice. In this paper, we propose schemes to use non-symmetric quantum channel combinations for probabilistic teleportation of an arbitrary two-qubit quantum state from sender to receiver. The non-symmetric quantum channel is composed of a two-qubit partially entangled state and a three-qubit partially entangled state, where partially entangled Greenberger–Horne–Zeilinger (GHZ) state and W state are considered, respectively. All schemes are presented in detail and the unitary operations required are given in concise formulas. Methods are provided for reducing classical communication cost and combining operations to simplify the manipulation. Moreover, our schemes are flexible and applicable in different situations. Full article
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Review

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Open AccessFeature PaperReview
Twenty Years of Quantum State Teleportation at the Sapienza University in Rome
Entropy 2019, 21(8), 768; https://doi.org/10.3390/e21080768 - 06 Aug 2019
Abstract
Quantum teleportation is one of the most striking consequence of quantum mechanics and is defined as the transmission and reconstruction of an unknown quantum state over arbitrary distances. This concept was introduced for the first time in 1993 by Charles Bennett and coworkers, [...] Read more.
Quantum teleportation is one of the most striking consequence of quantum mechanics and is defined as the transmission and reconstruction of an unknown quantum state over arbitrary distances. This concept was introduced for the first time in 1993 by Charles Bennett and coworkers, it has then been experimentally demonstrated by several groups under different conditions of distance, amount of particles and even with feed forward. After 20 years from its first realization, this contribution reviews the experimental implementations realized at the Quantum Optics Group of the University of Rome La Sapienza. Full article
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