The Impact of Quantum Phenomena on the Complexity of Communication Systems

Abstract: This publication put the accent on strategical problems in information transmission. The analysis is based on substantially different structure between classical (bit) and quantum information unit (qubit). The scientific methodology used in this publication is relatively new (single qubit transfer based on no-cloning theorem). Important part of publication is devoted to solving problems where quantum information processing offers much more prolific solutions than classical information processing. From practical point of view, the advances of quantum based information technologies have been presented.

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Encryption with weakly random keys using quantum ciphertext

Quantum Information and Computation ◽

10.26421/qic12.5-6-2 ◽

2012 ◽

Vol 12 (5&6) ◽

pp. 395-403

Author(s):

Jan Bouda ◽

Matej Pivoluska ◽

Martin Plesch

Keyword(s):

Information Processing ◽

Quantum Information ◽

Quantum Information Processing ◽

Single Case ◽

Full Information ◽

Classical Information ◽

Random Source ◽

Random Keys

The lack of perfect randomness can cause significant problems in securing communication between two parties. McInnes and Pinkas \cite{McInnesPinkas-ImpossibilityofPrivate-1991} proved that unconditionally secure encryption is impossible when the key is sampled from a weak random source. The adversary can always gain some information about the plaintext, regardless of the cryptosystem design. Most notably, the adversary can obtain full information about the plaintext if he has access to just two bits of information about the source (irrespective on length of the key). In this paper we show that for every weak random source there is a cryptosystem with a classical plaintext, a classical key, and a quantum ciphertext that bounds the adversary's probability $p$ to guess correctly the plaintext strictly under the McInnes-Pinkas bound, except for a single case, where it coincides with the bound. In addition, regardless of the source of randomness, the adversary's probability $p$ is strictly smaller than $1$ as long as there is some uncertainty in the key (Shannon/min-entropy is non-zero). These results are another demonstration that quantum information processing can solve cryptographic tasks with strictly higher security than classical information processing.

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Quantum-entanglement storage and extraction in quantum network node

International Journal of Quantum Information ◽

10.1142/s0219749918500090 ◽

2018 ◽

Vol 16 (01) ◽

pp. 1850009 ◽

Cited By ~ 1

Author(s):

ZhuoYu Shan ◽

Yong Zhang

Keyword(s):

Information Processing ◽

Quantum Information ◽

Quantum Entanglement ◽

Information Technologies ◽

Quantum Information Processing ◽

Bell State ◽

Nitrogen Vacancy ◽

Quantum Network ◽

Nuclear Spins ◽

Nv Centers

Quantum computing and quantum communication have become the most popular research topic. Nitrogen-vacancy (NV) centers in diamond have been shown the great advantage of implementing quantum information processing. The generation of entanglement between NV centers represents a fundamental prerequisite for all quantum information technologies. In this paper, we propose a scheme to realize the high-fidelity storage and extraction of quantum entanglement information based on the NV centers at room temperature. We store the entangled information of a pair of entangled photons in the Bell state into the nuclear spins of two NV centers, which can make these two NV centers entangled. And then we illuminate how to extract the entangled information from NV centers to prepare on-demand entangled states for optical quantum information processing. The strategy of engineering entanglement demonstrated here maybe pave the way towards a NV center-based quantum network.

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PROBLEMS AND PROSPECTS OF CREATION OF QUANTUM COMMUNICATION SYSTEMS

Innovatics and Expert Examination ◽

10.35264/1996-2274-2020-1-27-33 ◽

2020 ◽

pp. 27-33

Author(s):

I.I. Ryabtsev ◽

S.P. Yurkevichyus ◽

A.E. Gritsenko

Keyword(s):

Information Processing ◽

Quantum Information ◽

Communication Systems ◽

Quantum Communication ◽

Quantum Information Processing ◽

Scientific Research ◽

The State ◽

Processing Technology

Scientific and technological problems and prospects for creating quantum communication systems are herein outlined. A brief analysis of the state of scientific research in this area abroad is carried out. The strengths and weaknesses of the implementation of quantum information processing technology are reflected.

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