Analysis of the one-decoy-state SARG04 quantum cryptography protocol in the presence of afterpulse effects

Hu Nian ¹Ya-Feng Nie ²Chun-Mei Zhang ²Liang-Liang Lu³

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作者信息

1. Key Laboratory of Optoelectronic Technology of Jiangsu Province,School of Physical Science and Technology,Nanjing Normal University,Nanjing 210023,China
2. Institute of Quantum Information and Technology,Nanjing University of Posts and Telecommunications,Nanjing 210003,China
3. Key Laboratory of Optoelectronic Technology of Jiangsu Province,School of Physical Science and Technology,Nanjing Normal University,Nanjing 210023,China;Hefei National Laboratory,Hefei 230088,China
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Abstract

The SARG04 quantum key distribution protocol can offer greater robustness against photon number splitting attacks than the BB84 protocol that is implemented with weak pulses.In this paper,we propose a tight key analysis for the SARG04 protocol,by considering the one-decoy method and investigating its performance under the influence of a detector afterpulse.Our results demonstrate that an increase in block size leads to a slight increase in both the secure key rate and the maximum transmission distance.Importantly,the detector afterpulse plays a crucial role in practical applications and has a more pronounced effect on the SARG04 protocol compared to the BB84 protocol.

Key words

Quantum key distribution/SARG04 protocol/one decoy/afterpulse

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基金项目

National Natural Science Foundation of China(12274233)

National Natural Science Foundation of China(62371244)

出版年

2024

理论物理通讯(英文版)

中国科学院理论物理研究所中国物理学会

理论物理通讯(英文版)

CSTPCD

影响因子：0.333

ISSN：0253-6102

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