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 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.

Metadata

Item Type:	Article
Authors/Creators:	Currás Lorenzo, G https://orcid.org/0000-0003-2096-0036 Navarrete, A Azuma, K Kato, G Curty, M Razavi, M https://orcid.org/0000-0003-4172-2125
Copyright, Publisher and Additional Information:	© The Author(s) 2021. This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.
Dates:	Accepted: 12 December 2020 Published (online): 5 February 2021 Published: 5 February 2021
Institution:	The University of Leeds
Academic Units:	The University of Leeds > Faculty of Engineering & Physical Sciences (Leeds) > School of Electronic & Electrical Engineering (Leeds) > Pollard Institute (Leeds)
Funding Information:	Funder Grant number EU - European Union GA 575662
Depositing User:	Symplectic Publications
Date Deposited:	14 Dec 2020 14:53
Last Modified:	25 Jun 2023 22:19
Status:	Published
Publisher:	Springer Nature
Identification Number:	10.1038/s41534-020-00345-3
Related URLs:	Author
Open Archives Initiative ID (OAI ID):	oai:eprints.whiterose.ac.uk:162536

Download

Published Version

Filename: s41534-020-00345-3.pdf

Licence: CC-BY 4.0

CLICK TO DOWNLOAD

CORE (COnnecting REpositories)

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

Abstract

Metadata

Download

Published Version

Export

Statistics