Improved decoy-state quantum key distribution with uncharacterized heralded single-photon sources
Le-Chen Xu(徐乐辰)1,2,3, Chun-Hui Zhang(张春辉)1,2,3, Xing-Yu Zhou(周星宇)1,2,3, and Qin Wang(王琴)1,2,3,†
1 Institute of Quantum Information and Technology, Nanjing 210003, China; 2 Broadband Wireless Communication and Sensor Network Technology, Key Laboratory of Ministry of Education, Nanjing University of Posts and Telecommunications, Nanjing 210003, China; 3 Telecommunication and Networks National Engineering Research Center, Nanjing University of Posts and Telecommunications, Nanjing 210003, China
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 uncharacterized 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 prepared 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.
(Parametric down conversion and production of entangled photons)
Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 12074194, 12104240, and 62101285), the Industrial Prospect and Key Core Technology Projects of Jiangsu Provincial Key Research and Development Program (Grant No. BE2022071), and the Natural Science Foundation of Jiangsu Province, China (Grant Nos. BK20192001 and BK20210582).
Corresponding Authors:
Qin Wang
E-mail: qinw@njupt.edu.cn
Cite this article:
Le-Chen Xu(徐乐辰), Chun-Hui Zhang(张春辉), Xing-Yu Zhou(周星宇), and Qin Wang(王琴) Improved decoy-state quantum key distribution with uncharacterized heralded single-photon sources 2024 Chin. Phys. B 33 020313
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