Measurement-device-independent quantum key distribution with leaky sources

Abstract Measurement-device-independent quantum key distribution (MDI-QKD) can remove all detection side-channels from quantum communication systems. The security proofs require, however, that certain assumptions on the sources are satisfied. This includes, for instance, the requirement that there i...

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Autores principales:	Weilong Wang, Kiyoshi Tamaki, Marcos Curty
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/72f35afdef8d4656823bfdd5f3802586
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spelling	oai:doaj.org-article:72f35afdef8d4656823bfdd5f38025862021-12-02T13:50:42ZMeasurement-device-independent quantum key distribution with leaky sources10.1038/s41598-021-81003-22045-2322https://doaj.org/article/72f35afdef8d4656823bfdd5f38025862021-01-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-81003-2https://doaj.org/toc/2045-2322Abstract Measurement-device-independent quantum key distribution (MDI-QKD) can remove all detection side-channels from quantum communication systems. The security proofs require, however, that certain assumptions on the sources are satisfied. This includes, for instance, the requirement that there is no information leakage from the transmitters of the senders, which unfortunately is very difficult to guarantee in practice. In this paper we relax this unrealistic assumption by presenting a general formalism to prove the security of MDI-QKD with leaky sources. With this formalism, we analyze the finite-key security of two prominent MDI-QKD schemes—a symmetric three-intensity decoy-state MDI-QKD protocol and a four-intensity decoy-state MDI-QKD protocol—and determine their robustness against information leakage from both the intensity modulator and the phase modulator of the transmitters. Our work shows that MDI-QKD is feasible within a reasonable time frame of signal transmission given that the sources are sufficiently isolated. Thus, it provides an essential reference for experimentalists to ensure the security of implementations of MDI-QKD in the presence of information leakage.Weilong WangKiyoshi TamakiMarcos CurtyNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-11 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Weilong Wang Kiyoshi Tamaki Marcos Curty Measurement-device-independent quantum key distribution with leaky sources
description	Abstract Measurement-device-independent quantum key distribution (MDI-QKD) can remove all detection side-channels from quantum communication systems. The security proofs require, however, that certain assumptions on the sources are satisfied. This includes, for instance, the requirement that there is no information leakage from the transmitters of the senders, which unfortunately is very difficult to guarantee in practice. In this paper we relax this unrealistic assumption by presenting a general formalism to prove the security of MDI-QKD with leaky sources. With this formalism, we analyze the finite-key security of two prominent MDI-QKD schemes—a symmetric three-intensity decoy-state MDI-QKD protocol and a four-intensity decoy-state MDI-QKD protocol—and determine their robustness against information leakage from both the intensity modulator and the phase modulator of the transmitters. Our work shows that MDI-QKD is feasible within a reasonable time frame of signal transmission given that the sources are sufficiently isolated. Thus, it provides an essential reference for experimentalists to ensure the security of implementations of MDI-QKD in the presence of information leakage.
format	article
author	Weilong Wang Kiyoshi Tamaki Marcos Curty
author_facet	Weilong Wang Kiyoshi Tamaki Marcos Curty
author_sort	Weilong Wang
title	Measurement-device-independent quantum key distribution with leaky sources
title_short	Measurement-device-independent quantum key distribution with leaky sources
title_full	Measurement-device-independent quantum key distribution with leaky sources
title_fullStr	Measurement-device-independent quantum key distribution with leaky sources
title_full_unstemmed	Measurement-device-independent quantum key distribution with leaky sources
title_sort	measurement-device-independent quantum key distribution with leaky sources
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/72f35afdef8d4656823bfdd5f3802586
work_keys_str_mv	AT weilongwang measurementdeviceindependentquantumkeydistributionwithleakysources AT kiyoshitamaki measurementdeviceindependentquantumkeydistributionwithleakysources AT marcoscurty measurementdeviceindependentquantumkeydistributionwithleakysources
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Measurement-device-independent quantum key distribution with leaky sources

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