Tight finite-key analysis for quantum key distribution without monitoring signal disturbance

Abstract Unlike traditional communication, quantum key distribution (QKD) can reach unconditional security and thus attracts intensive studies. Among all existing QKD protocols, round-robin-differential-phase-shift (RRDPS) protocol can be running without monitoring signal disturbance, which signific...

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Autores principales:	Hang Liu, Zhen-Qiang Yin, Rong Wang, Ze-Hao Wang, Shuang Wang, Wei Chen, Guang-Can Guo, Zheng-Fu Han
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/3908db1ac7d246fdb6ae7ff4fe96e45f
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spelling	oai:doaj.org-article:3908db1ac7d246fdb6ae7ff4fe96e45f2021-12-02T17:51:53ZTight finite-key analysis for quantum key distribution without monitoring signal disturbance10.1038/s41534-021-00428-92056-6387https://doaj.org/article/3908db1ac7d246fdb6ae7ff4fe96e45f2021-06-01T00:00:00Zhttps://doi.org/10.1038/s41534-021-00428-9https://doaj.org/toc/2056-6387Abstract Unlike traditional communication, quantum key distribution (QKD) can reach unconditional security and thus attracts intensive studies. Among all existing QKD protocols, round-robin-differential-phase-shift (RRDPS) protocol can be running without monitoring signal disturbance, which significantly simplifies its flow and improves its tolerance of error rate. Although several security proofs of RRDPS have been given, a tight finite-key analysis with a practical phase-randomized source is still missing. In this paper, we propose an improved security proof of RRDPS against the most general coherent attack based on the entropic uncertainty relation. What’s more, with the help of Azuma’s inequality, our proof can tackle finite-key effects primely. The proposed finite-key analysis keeps the advantages of phase randomization source and indicates experimentally acceptable numbers of pulses are sufficient to approach the asymptotical bound closely. The results shed light on practical QKD without monitoring signal disturbance.Hang LiuZhen-Qiang YinRong WangZe-Hao WangShuang WangWei ChenGuang-Can GuoZheng-Fu HanNature PortfolioarticlePhysicsQC1-999Electronic computers. Computer scienceQA75.5-76.95ENnpj Quantum Information, Vol 7, Iss 1, Pp 1-6 (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 Hang Liu Zhen-Qiang Yin Rong Wang Ze-Hao Wang Shuang Wang Wei Chen Guang-Can Guo Zheng-Fu Han Tight finite-key analysis for quantum key distribution without monitoring signal disturbance
description	Abstract Unlike traditional communication, quantum key distribution (QKD) can reach unconditional security and thus attracts intensive studies. Among all existing QKD protocols, round-robin-differential-phase-shift (RRDPS) protocol can be running without monitoring signal disturbance, which significantly simplifies its flow and improves its tolerance of error rate. Although several security proofs of RRDPS have been given, a tight finite-key analysis with a practical phase-randomized source is still missing. In this paper, we propose an improved security proof of RRDPS against the most general coherent attack based on the entropic uncertainty relation. What’s more, with the help of Azuma’s inequality, our proof can tackle finite-key effects primely. The proposed finite-key analysis keeps the advantages of phase randomization source and indicates experimentally acceptable numbers of pulses are sufficient to approach the asymptotical bound closely. The results shed light on practical QKD without monitoring signal disturbance.
format	article
author	Hang Liu Zhen-Qiang Yin Rong Wang Ze-Hao Wang Shuang Wang Wei Chen Guang-Can Guo Zheng-Fu Han
author_facet	Hang Liu Zhen-Qiang Yin Rong Wang Ze-Hao Wang Shuang Wang Wei Chen Guang-Can Guo Zheng-Fu Han
author_sort	Hang Liu
title	Tight finite-key analysis for quantum key distribution without monitoring signal disturbance
title_short	Tight finite-key analysis for quantum key distribution without monitoring signal disturbance
title_full	Tight finite-key analysis for quantum key distribution without monitoring signal disturbance
title_fullStr	Tight finite-key analysis for quantum key distribution without monitoring signal disturbance
title_full_unstemmed	Tight finite-key analysis for quantum key distribution without monitoring signal disturbance
title_sort	tight finite-key analysis for quantum key distribution without monitoring signal disturbance
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/3908db1ac7d246fdb6ae7ff4fe96e45f
work_keys_str_mv	AT hangliu tightfinitekeyanalysisforquantumkeydistributionwithoutmonitoringsignaldisturbance AT zhenqiangyin tightfinitekeyanalysisforquantumkeydistributionwithoutmonitoringsignaldisturbance AT rongwang tightfinitekeyanalysisforquantumkeydistributionwithoutmonitoringsignaldisturbance AT zehaowang tightfinitekeyanalysisforquantumkeydistributionwithoutmonitoringsignaldisturbance AT shuangwang tightfinitekeyanalysisforquantumkeydistributionwithoutmonitoringsignaldisturbance AT weichen tightfinitekeyanalysisforquantumkeydistributionwithoutmonitoringsignaldisturbance AT guangcanguo tightfinitekeyanalysisforquantumkeydistributionwithoutmonitoringsignaldisturbance AT zhengfuhan tightfinitekeyanalysisforquantumkeydistributionwithoutmonitoringsignaldisturbance
_version_	1718379219358056448

Tight finite-key analysis for quantum key distribution without monitoring signal disturbance

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