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Entropy
Volume 25
Issue 11
10.3390/e25111556
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Article

Security of the Decoy-State BB84 Protocol with Imperfect State Preparation

by
Aleksei Reutov
,
Andrey Tayduganov
*,
Vladimir Mayboroda
and
Oleg Fat’yanov
Laboratory of Quantum Information Technologies, National University of Science and Technology MISIS, Moscow 119049, Russia
*
Author to whom correspondence should be addressed.
Entropy 2023, 25(11), 1556; https://doi.org/10.3390/e25111556
Submission received: 6 October 2023 / Revised: 6 November 2023 / Accepted: 14 November 2023 / Published: 17 November 2023
(This article belongs to the Special Issue Quantum Information: From Fundamental Aspects to Practical Applications)
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Abstract

The quantum key distribution (QKD) allows two remote users to share a common information-theoretic secure secret key. In order to guarantee the security of a practical QKD implementation, the physical system has to be fully characterized and all deviations from the ideal protocol due to various imperfections of realistic devices have to be taken into account in the security proof. In this work, we study the security of the efficient decoy-state BB84 QKD protocol in the presence of the source flaws, caused by imperfect intensity and polarization modulation. We investigate the non-Poissonian photon-number statistics due to coherent-state intensity fluctuations and the basis-dependence of the source due to non-ideal polarization state preparation. The analysis is supported by the experimental characterization of intensity and phase distributions.
Keywords: quantum communication; quantum key distribution; BB84; source flaw quantum communication; quantum key distribution; BB84; source flaw

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MDPI and ACS Style

Reutov, A.; Tayduganov, A.; Mayboroda, V.; Fat’yanov, O. Security of the Decoy-State BB84 Protocol with Imperfect State Preparation. Entropy 2023, 25, 1556. https://doi.org/10.3390/e25111556

AMA Style

Reutov A, Tayduganov A, Mayboroda V, Fat’yanov O. Security of the Decoy-State BB84 Protocol with Imperfect State Preparation. Entropy. 2023; 25(11):1556. https://doi.org/10.3390/e25111556

Chicago/Turabian Style

Reutov, Aleksei, Andrey Tayduganov, Vladimir Mayboroda, and Oleg Fat’yanov. 2023. "Security of the Decoy-State BB84 Protocol with Imperfect State Preparation" Entropy 25, no. 11: 1556. https://doi.org/10.3390/e25111556

APA Style

Reutov, A., Tayduganov, A., Mayboroda, V., & Fat’yanov, O. (2023). Security of the Decoy-State BB84 Protocol with Imperfect State Preparation. Entropy, 25(11), 1556. https://doi.org/10.3390/e25111556

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