| 基于BB84协议的实际QKD系统的窃听问题研究 |
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| 引用本文： | 刘景锋,梁瑞生,唐志列,魏正军,陈志新,廖常俊,刘颂豪.基于BB84协议的实际QKD系统的窃听问题研究[J].光子学报,2004,33(11):1356-1359. |
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| 作者姓名： | 刘景锋 梁瑞生 唐志列 魏正军 陈志新 廖常俊 刘颂豪 |
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| 作者单位： | 华南师范大学信息光电子科技学院,广州,510631;华南师范大学物理系,广州,510631 |
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| 基金项目： | 国家973(2001CB309300)项目，广州市(1999Z03501)资助项目 |
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| 摘 要： | 基于实际量子密钥分配系统中所使用的强衰减的激光脉冲并不是单光子,量子密钥分配的信道不是无损耗的,窃听者的技术能力也不是无限的这些具体问题,采用了分束窃听与截获重发窃听策略相结合的方案讨论了窃听问题并给出了合法用户在筛选后的密钥中所能容忍的误码率上限.
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| 关 键 词： | 量子密钥 BB84协议 光子数统计分布 窃听策略 |
| 收稿时间： | 2003-09-26 |
| 修稿时间： | 2003年9月26日 |
Eavesdropping of Practical QKD System Based on BB84 Protocol |
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.Eavesdropping of Practical QKD System Based on BB84 Protocol[J].Acta Photonica Sinica,2004,33(11):1356-1359. |
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| Authors: |
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| Institution: | (1 School for Information and Optoelectronics Science and Engineering, South China Normal University, Guangzhou 510631) (2 Department of Physics, South China Normal University, Guangzhou 51063)
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| Abstract: | Practical implementations of quantum key distribution systems use attenuated laser pulses as the signal source rather than single photons. The channels used to transmit are lossy. On the basis of above two points, a combining eavesdropping strategy of intercept-resend and beamsplitting is discussed in terms of eavesdropper’s technology requirement. At last, a maximum disturbance bound is derived for a given mean photon number and transmission length. Eavesdropper can be detected with the bound. |
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| Keywords: | Quantum key BB84 protocol Photon number statistics distributing Eavesdropping strategy |
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