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通过引入量子信道传输率、单光子捕获概率、检测因子和数据筛选因子,给出了自由空间量子密钥分配中量 子密钥比特率的表达式。针对低轨卫星-地面站间激光链路,进行了量子密钥比特率的数值仿真研究。结果表明,在低轨 卫星-地面站间进行量子密钥分配是可行的。
By introducing quantum channel transmission rate, single-photon capture probability, detection factor and data screening factor, the expression of quantum key bit rate in free-space quantum key distribution is given. Aiming at the laser link between LEO satellite and ground station, numerical simulation of quantum key bit rate is carried out. The results show that the quantum key distribution between LEO satellite and ground station is feasible.