Cargando…

Robust twin-field quantum key distribution through sending or not sending

The sending-or-not-sending (SNS) protocol is one of the most major variants of the twin-field (TF) quantum key distribution (QKD) protocol and has been realized in a 511-km field fiber, the farthest field experiment to date. In practice, however, all decoy-state methods have unavoidable source error...

Descripción completa

Detalles Bibliográficos
Autores principales: Jiang, Cong, Yu, Zong-Wen, Hu, Xiao-Long, Wang, Xiang-Bin
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Oxford University Press 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10115169/
https://www.ncbi.nlm.nih.gov/pubmed/37089191
http://dx.doi.org/10.1093/nsr/nwac186
_version_ 1785028150937255936
author Jiang, Cong
Yu, Zong-Wen
Hu, Xiao-Long
Wang, Xiang-Bin
author_facet Jiang, Cong
Yu, Zong-Wen
Hu, Xiao-Long
Wang, Xiang-Bin
author_sort Jiang, Cong
collection PubMed
description The sending-or-not-sending (SNS) protocol is one of the most major variants of the twin-field (TF) quantum key distribution (QKD) protocol and has been realized in a 511-km field fiber, the farthest field experiment to date. In practice, however, all decoy-state methods have unavoidable source errors, and the source errors may be non-random, which compromises the security condition of the existing TF-QKD protocols. In this study, we present a general approach for efficiently calculating the SNS protocol’s secure key rate with source errors, by establishing the equivalent protocols through virtual attenuation and the tagged model. This makes the first result for TF QKD in practice where source intensity cannot be controlled exactly. Our method can be combined with the two-way classical communication method such as active odd-parity pairing to further improve the key rate. The numerical results show that if the intensity error is within a few percent, the key rate and secure distance only decrease marginally. The key rate of the recent SNS experiment in the 511-km field fiber is still positive using our method presented here, even if there is a [Formula: see text] intensity fluctuation. This shows that the SNS protocol is robust against source errors.
format Online
Article
Text
id pubmed-10115169
institution National Center for Biotechnology Information
language English
publishDate 2022
publisher Oxford University Press
record_format MEDLINE/PubMed
spelling pubmed-101151692023-04-20 Robust twin-field quantum key distribution through sending or not sending Jiang, Cong Yu, Zong-Wen Hu, Xiao-Long Wang, Xiang-Bin Natl Sci Rev Research Article The sending-or-not-sending (SNS) protocol is one of the most major variants of the twin-field (TF) quantum key distribution (QKD) protocol and has been realized in a 511-km field fiber, the farthest field experiment to date. In practice, however, all decoy-state methods have unavoidable source errors, and the source errors may be non-random, which compromises the security condition of the existing TF-QKD protocols. In this study, we present a general approach for efficiently calculating the SNS protocol’s secure key rate with source errors, by establishing the equivalent protocols through virtual attenuation and the tagged model. This makes the first result for TF QKD in practice where source intensity cannot be controlled exactly. Our method can be combined with the two-way classical communication method such as active odd-parity pairing to further improve the key rate. The numerical results show that if the intensity error is within a few percent, the key rate and secure distance only decrease marginally. The key rate of the recent SNS experiment in the 511-km field fiber is still positive using our method presented here, even if there is a [Formula: see text] intensity fluctuation. This shows that the SNS protocol is robust against source errors. Oxford University Press 2022-09-19 /pmc/articles/PMC10115169/ /pubmed/37089191 http://dx.doi.org/10.1093/nsr/nwac186 Text en © The Author(s) 2022. Published by Oxford University Press on behalf of China Science Publishing & Media Ltd. https://creativecommons.org/licenses/by/4.0/This is an Open Access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited.
spellingShingle Research Article
Jiang, Cong
Yu, Zong-Wen
Hu, Xiao-Long
Wang, Xiang-Bin
Robust twin-field quantum key distribution through sending or not sending
title Robust twin-field quantum key distribution through sending or not sending
title_full Robust twin-field quantum key distribution through sending or not sending
title_fullStr Robust twin-field quantum key distribution through sending or not sending
title_full_unstemmed Robust twin-field quantum key distribution through sending or not sending
title_short Robust twin-field quantum key distribution through sending or not sending
title_sort robust twin-field quantum key distribution through sending or not sending
topic Research Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10115169/
https://www.ncbi.nlm.nih.gov/pubmed/37089191
http://dx.doi.org/10.1093/nsr/nwac186
work_keys_str_mv AT jiangcong robusttwinfieldquantumkeydistributionthroughsendingornotsending
AT yuzongwen robusttwinfieldquantumkeydistributionthroughsendingornotsending
AT huxiaolong robusttwinfieldquantumkeydistributionthroughsendingornotsending
AT wangxiangbin robusttwinfieldquantumkeydistributionthroughsendingornotsending