Fig. 1. Free space MDI-QKD diagram. BS, 50 : 50 beam splitter; PBS, polarized beam splitter; D_1H, D_2H, D_1V, D_2V, single-photon detector; U1 (U2), Alice and Bob’s atmospheric channel. 自由空间测量设备无关量子密钥分发模型示意图(BS, 50 : 50光分束器; PBS, 偏振光分束器; D_1H, D_2H, D_1V, D_2V, 单光子探测器; U1 (U2), Alice和Bob的大气信道)

Fig. 2. Relationship between and scintillation coefficient . 与闪烁系数 的关系

Fig. 3. Relationship of optimal threshold value to channel parameter and average transmission rate . 最佳阈值 与信道参数 、平均传输率 的关系

Fig. 4. Relationship of key rate of MDI-QKD under strong turbulence to threshold and channel parameters.强湍流下MDI-QKD密钥率与阈值、信道参数的关系

Fig. 5. Relationship between key rate of MDI-QKD under strong turbulence and channel loss.强湍流下MDI-QKD密钥率与信道损耗间的关系