基于不可信光源的量子密钥分配的统计特性研究

Analysis statistical fluctuation of passive untrusted source for quantum key distribution system

通过比较被动系统与主动系统的特性,得出可信光源、不可信光源主动系统和不可信光源被动系统的密钥生成率随距离的变化关系;采用标准误差分析法,得到相应变量的偏离量;基于诱骗态方案分析不可信光源被动系统暗计数率和光源强度参数波动对系统安全特性的影响,得出在1310 nm和1550 nm通信窗口下,系统最大安全通信距离范围分别为[73.2 km,96.5 km]和[104.5 km,137.9 km].这可为实用量子通信实验提供重要的理论参数.

The performance of active decoy-state quantum key distribution （QKD） system with an untrusted source is compared with that of passive decoy-state QKD. The key generation rate with the change of the secure transmission distance is shown under the condition of active decoy-state （or passive decoy-state） QKD where we pick the data size to be N = 1012. The security characteristics of the passive scheme are studied with statistical fluctuation of the counting rate and the intensity of the practical source. At communication wavelength 1310 nm or 1550 nm, The security range of communication distance is [73.2 km, 96.5 km] or [104.5 km, 137.9 kin] respectively. This analysis will provide important theoretical parameters for practical QKD experiment.