中文摘要：

文章通过比较主动诱惑态和被动诱惑态的特性,假设所有可测量都围绕渐近值上下波动,得到相应变量的偏离量,采用标准误差法分析实用光源条件下,有限脉冲数编码对密钥生成率和传输距离的影响,比较了主动诱惑态、被动诱惑态、无限长时间极限情况和不同量子效率条件下密钥生成率随传输距离的变化关系,为实用的量子密钥分配实验提供了重要的理论参数.

英文摘要：

The performance of active decoy-state quantum key distribution （QKD） system with a practical light source is compared with that of passive decoy-state QKD.The effect of statistical fluctuation due to a finite data size on final secret key rate is analyzed.This procedure is based on the standard error analysis on the assumption that all the variables measured in the experiment fluctuate around their asymptotic values.The relation between key generation rate and secure transmission distance is shown with exchanged quantum efficiency of threshold detector （ηd=1 and ηd=0.4） under the condition of active decoy-state （or passive decoy-state） QKD which we pick the data size to be N=6.0×109.This analysis will provide important parameters for practical QKD experiment.