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分析了基于微弱相干脉冲量子密钥分配的误码系数,结果表明,误码系数并非为一固定常数,而是随着传输距离增加而变化。根据实验数据对误码系数与传输距离之间的关系进行了函数拟合,3个实验小组数据拟合出能够很好地符合同一指数函数形式。利用拟合的误码系数对诱惑态下BB84量子密钥分配方案的平均光子数进行了优化,根据优化结果,利用GYS的实验参数分析了Lo等人提出的诱惑态量子密钥效率表达式,结果表明,误码系数修正后的表达式具有更高的密钥生成效率空间。
The error coefficients of quantum key distribution based on weak coherent pulse are analyzed. The results show that the error coefficients are not constant, but change with the increase of transmission distance. According to the experimental data, the relationship between the error coefficient and the transmission distance was functionally fitted. The data from three experimental groups fitted well to the same exponential function. The average number of photons in the BB84 quantum key distribution scheme under temptation is optimized by using the fitted error coefficients. Based on the optimization results, we use the experimental parameters of GYS to analyze the temporally efficient quantum key efficiency expression proposed by Lo et al. The result shows that the modified expression of error coefficient has higher key generation efficiency space.