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.
The expressions of the quantum key bit rate are given for free-space quantum key distribution by introducing the quantum channel transmission, the single-photon acquisition probability, the detection factor and the sifting factor. The quantum key bit rate is studied in the numerical simulation for the laser links between a ground station and a satellite in a low earth orbit.The results show that it is feasible to implement quantum key distribution between a ground station and a satellite in a low earth orbit.
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