Improved decoy-state quantum key distribution with uncharacterized heralded single-photon sources

徐乐辰 ¹张春辉 ¹周星宇 ¹王琴¹

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作者信息

1. Institute of Quantum Information and Technology,Nanjing 210003,China;Broadband Wireless Communication and Sensor Network Technology,Key Laboratory of Ministry of Education,Nanjing University of Posts and Telecommunications,Nanjing 210003,China;Telecommunication and Networks National Engineering Research Center,Nanjing University of Posts and Telecommunications,Nanjing 210003,China
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Abstract

Encoding system plays a significant role in quantum key distribution(QKD).However,the security and performance of QKD systems can be compromised by encoding misalignment due to the inevitable defects in realistic devices.To alleviate the influence of misalignments,a method exploiting statistics from mismatched basis is proposed to enable un-characterized sources to generate secure keys in QKD.In this work,we propose a scheme on four-intensity decoy-state quantum key distribution with uncharacterized heralded single-photon sources.It only requires the source states are pre-pared in a two-dimensional Hilbert space,and can thus reduce the complexity of practical realizations.Moreover,we carry out corresponding numerical simulations and demonstrate that our present four-intensity decoy-state scheme can achieve a much higher key rate compared than a three-intensity decoy-state method,and meantime it can obtain a longer transmission distance compared than the one using weak coherent sources.

Key words

quantum key distribution/heralded single-photon source/decoy-state method

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基金项目

National Natural Science Foundation of China(12074194)

National Natural Science Foundation of China(12104240)

National Natural Science Foundation of China(62101285)

Industrial Prospect and Key Core Technology Projects of Jiangsu Provincial Key Research and Development Program(BE2022071)

Natural Science Foundation of Jiangsu Province,China(BK20192001)

Natural Science Foundation of Jiangsu Province,China(BK20210582)

出版年

2024

中国物理B(英文版)

中国物理学会和中国科学院物理研究所

中国物理B(英文版)

CSTPCDEI

影响因子：0.995

ISSN：1674-1056

参考文献量30

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