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Security of the traditional quantum key distribution protocols with finite-key lengths |
| Bao Feng(冯宝)1,2, Hai-Dong Huang(黄海东)3, Yu-Xiang Bian(卞宇翔)1,2, Wei Jia(贾玮)1,2, Xing-Yu Zhou(周星宇)4,†, and Qin Wang(王琴)4 |
1 State Grid Electric Power Research Institute, Nanjing 211000, China;
2 NRGD Quantum CTEK Co., Ltd., Nanjing 211000, China;
3 State Grid Jiangsu Electric Power Co., Ltd., Nanjing 210000, China;
4 Institute of Quantum Information and Technology, Nanjing University of Posts and Telecommunications, Nanjing 210003, China |
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Abstract Quantum key distribution (QKD) in principle can provide unconditional secure communication between distant parts. However, when finite-key length is taken into account, the security can only be ensured within certain security level. In this paper, we adopt the Chernoff bound analysis method to deal with finite-key-size effects, carrying out corresponding investigations on the relationship between the key generation rate and security parameters for different protocols, including BB84, measurement-device-independent and twin-field QKD protocols. Simulation results show that there exists a fundamental limit between the key rate and the security parameters. Therefore, this study can provide valuable references for practical application of QKD, getting a nice balance between the key generation rate and the security level.
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Received: 19 July 2022
Revised: 29 September 2022
Accepted manuscript online: 19 October 2022
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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: Project supported by the Research on Key Technology and Equipment Development of Autonomous and Controllable Lightweight Endogenous Safety of Power Monitoring System (Grant No. 5108-202118056A-0-0-00). |
Corresponding Authors:
Xing-Yu Zhou
E-mail: xyz@njupt.edu.cn
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Cite this article:
Bao Feng(冯宝), Hai-Dong Huang(黄海东), Yu-Xiang Bian(卞宇翔), Wei Jia(贾玮), Xing-Yu Zhou(周星宇), and Qin Wang(王琴) Security of the traditional quantum key distribution protocols with finite-key lengths 2023 Chin. Phys. B 32 030307
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