| SPECIAL TOPIC — Quantum communication and quantum network |
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Improved reference-frame-independent quantum key distribution with intensity fluctuations |
| Zi-Qi Chen(陈子骐)1,2, Hao-Bing Sun(孙昊冰)1,2, Ming-Shuo Sun(孙铭烁)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 Reference-frame-independent quantum key distribution (RFI-QKD) can avoid real-time calibration operation of reference frames and improve the efficiency of the communication process. However, due to imperfections of optical devices, there will inevitably exist intensity fluctuations in the source side of the QKD system, which will affect the final secure key rate. To reduce the influence of intensity fluctuations, an improved 3-intensity RFI-QKD scheme is proposed in this paper. After considering statistical fluctuations and implementing global parameter optimization, we conduct corresponding simulation analysis. The results show that our present work can present both higher key rate and a farther transmission distance than the standard method.
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Received: 19 September 2024
Revised: 21 November 2024
Accepted manuscript online: 03 December 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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42.65.Lm
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(Parametric down conversion and production of entangled photons)
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| Fund: We gratefully acknowledge the financial support from the Industrial Prospect and Key Core Technology Projects of Jiangsu Provincial Key R&D Program (Grant No. BE2022071), the Natural Science Foundation of Jiangsu Province (Grant No. BK20192001), the National Natural Science Foundation of China (Grant No. 12074194), and the Postgraduate Research & Practice Innovation Program of Jiangsu Province (Grant No. KYCX220954). |
Corresponding Authors:
Qin Wang
E-mail: qinw@njupt.edu.cn
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Cite this article:
Zi-Qi Chen(陈子骐), Hao-Bing Sun(孙昊冰), Ming-Shuo Sun(孙铭烁), and Qin Wang(王琴) Improved reference-frame-independent quantum key distribution with intensity fluctuations 2025 Chin. Phys. B 34 020302
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