| SPECIAL TOPIC — Quantum communication and quantum network |
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Side-channel free quantum digital signature with source monitoring |
| Luo-Jia Ma(马洛嘉)1,2, Ming-Shuo Sun(孙铭烁)1,2, Chun-Hui Zhang(张春辉)1,2, Hua-Jian Ding(丁华建)1,2, Xing-Yu Zhou(周星宇)1,2, Jian Li(李剑)1,2, and Qin Wang(王琴)1,2,† |
1 Institute of Quantum Information and Technology, Nanjing University of Posts and Telecommunications, 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 |
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Abstract Quantum digital signature (QDS) can guarantee the information-theoretical security of a signature with the fundamental laws of quantum physics. However, most current QDS protocols do not take source security into account, leading to an overestimation of the signature rate. In this paper, we propose to utilize Hong-Ou-Mandel interference to characterize the upper bound of the source imperfections, and further to quantify information leakage from potential side-channels. Additionally, we combine decoy-state methods and finite-size analysis in analyzing the signature rate. Simulation results demonstrate the performance and feasibility of our approach. Our current work can improve the practical security of QDS systems, thereby promoting their further networked applications.
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Received: 30 July 2024
Revised: 06 October 2024
Accepted manuscript online: 18 October 2024
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PACS:
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03.67.Dd
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(Quantum cryptography and communication security)
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03.67.Hk
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(Quantum communication)
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42.79.Sz
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(Optical communication systems, multiplexers, and demultiplexers?)
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| Fund: We gratefully acknowledge the financial support from the Natural Science Foundation of Jiangsu Province (Grant Nos. BE2022071 and BK20192001), the National Natural Science Foundation of China (Grant Nos. 12074194, 62471248, 12104240, and 62101285), and the Postgraduate Research & Practice Innovation Program of Jiangsu Province (Grant No. KYCX22 0954). |
Corresponding Authors:
Qin Wang
E-mail: qinw@njupt.edu.cn
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Cite this article:
Luo-Jia Ma(马洛嘉), Ming-Shuo Sun(孙铭烁), Chun-Hui Zhang(张春辉), Hua-Jian Ding(丁华建), Xing-Yu Zhou(周星宇), Jian Li(李剑), and Qin Wang(王琴) Side-channel free quantum digital signature with source monitoring 2025 Chin. Phys. B 34 010301
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