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。
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.
出处
《光子学报》
EI
CAS
CSCD
北大核心
2004年第11期1356-1359,共4页
Acta Photonica Sinica
基金
国家973(2001CB309300)项目
广州市(1999Z03501)资助项目
关键词
量子密钥
BB84协议
光子数统计分布
窃听策略
Quantum key
BB84 protocol
Photon number statistics distributing
Eavesdropping strategy