Tight finite-key security for twin-field quantum key distribution

Abstract Quantum key distribution (QKD) offers a reliable solution to communication problems that require long-term data security. For its widespread use, however, the rate and reach of QKD systems must be improved. Twin-field (TF) QKD is a step forward toward this direction, with early demonstratio...

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Autores principales:	Guillermo Currás-Lorenzo, Álvaro Navarrete, Koji Azuma, Go Kato, Marcos Curty, Mohsen Razavi
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Physics QC1-999 Electronic computers. Computer science QA75.5-76.95
Acceso en línea:	https://doaj.org/article/2865763991f5416abcb120f85a18582b
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spelling	oai:doaj.org-article:2865763991f5416abcb120f85a18582b2021-12-02T14:06:33ZTight finite-key security for twin-field quantum key distribution10.1038/s41534-020-00345-32056-6387https://doaj.org/article/2865763991f5416abcb120f85a18582b2021-02-01T00:00:00Zhttps://doi.org/10.1038/s41534-020-00345-3https://doaj.org/toc/2056-6387Abstract Quantum key distribution (QKD) offers a reliable solution to communication problems that require long-term data security. For its widespread use, however, the rate and reach of QKD systems must be improved. Twin-field (TF) QKD is a step forward toward this direction, with early demonstrations suggesting it can beat the current rate-versus-distance records. A recently introduced variant of TF-QKD is particularly suited for experimental implementation, and has been shown to offer a higher key rate than other variants in the asymptotic regime, where users exchange an infinite number of signals. Here, we extend the security of this protocol to the finite-key regime, showing that it can overcome the fundamental bounds on point-to-point QKD with ~1010 transmitted signals. In many practical regimes of interest, our analysis offers higher key rates than those of alternative variants. Moreover, some of the techniques we develop are applicable to the finite-key analysis of other QKD protocols.Guillermo Currás-LorenzoÁlvaro NavarreteKoji AzumaGo KatoMarcos CurtyMohsen RazaviNature PortfolioarticlePhysicsQC1-999Electronic computers. Computer scienceQA75.5-76.95ENnpj Quantum Information, Vol 7, Iss 1, Pp 1-9 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Physics QC1-999 Electronic computers. Computer science QA75.5-76.95
spellingShingle	Physics QC1-999 Electronic computers. Computer science QA75.5-76.95 Guillermo Currás-Lorenzo Álvaro Navarrete Koji Azuma Go Kato Marcos Curty Mohsen Razavi Tight finite-key security for twin-field quantum key distribution
description	Abstract Quantum key distribution (QKD) offers a reliable solution to communication problems that require long-term data security. For its widespread use, however, the rate and reach of QKD systems must be improved. Twin-field (TF) QKD is a step forward toward this direction, with early demonstrations suggesting it can beat the current rate-versus-distance records. A recently introduced variant of TF-QKD is particularly suited for experimental implementation, and has been shown to offer a higher key rate than other variants in the asymptotic regime, where users exchange an infinite number of signals. Here, we extend the security of this protocol to the finite-key regime, showing that it can overcome the fundamental bounds on point-to-point QKD with ~1010 transmitted signals. In many practical regimes of interest, our analysis offers higher key rates than those of alternative variants. Moreover, some of the techniques we develop are applicable to the finite-key analysis of other QKD protocols.
format	article
author	Guillermo Currás-Lorenzo Álvaro Navarrete Koji Azuma Go Kato Marcos Curty Mohsen Razavi
author_facet	Guillermo Currás-Lorenzo Álvaro Navarrete Koji Azuma Go Kato Marcos Curty Mohsen Razavi
author_sort	Guillermo Currás-Lorenzo
title	Tight finite-key security for twin-field quantum key distribution
title_short	Tight finite-key security for twin-field quantum key distribution
title_full	Tight finite-key security for twin-field quantum key distribution
title_fullStr	Tight finite-key security for twin-field quantum key distribution
title_full_unstemmed	Tight finite-key security for twin-field quantum key distribution
title_sort	tight finite-key security for twin-field quantum key distribution
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/2865763991f5416abcb120f85a18582b
work_keys_str_mv	AT guillermocurraslorenzo tightfinitekeysecurityfortwinfieldquantumkeydistribution AT alvaronavarrete tightfinitekeysecurityfortwinfieldquantumkeydistribution AT kojiazuma tightfinitekeysecurityfortwinfieldquantumkeydistribution AT gokato tightfinitekeysecurityfortwinfieldquantumkeydistribution AT marcoscurty tightfinitekeysecurityfortwinfieldquantumkeydistribution AT mohsenrazavi tightfinitekeysecurityfortwinfieldquantumkeydistribution
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Tight finite-key security for twin-field quantum key distribution

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