【摘要】 根据电磁波传播与散射理论,考虑衰减和去极化效应等因素,建立了地空极化编码单光子源的传播模型,研究了空气衰减和天顶角与密钥生成速率间的关系,并建立了交叉极化分辨率和系统误码间的关系式;分析并仿真了大气环境对量子密钥分发的影响;结果表明:大气衰减对量子密钥分发系统每秒密钥生成数的影响较大;降雨条件下引起的去极化效应则会造成量子误码率增加。更多还原

【Abstract】 Considering attenuation and depolarization effects on Earth space paths,a model for propagation of pulsed single photon source coded with polarization in stratospheric quantum communication system is obtained theoretically. The relationship of key generation rate between atmospheric attenuation and zenith angle is obtained. Numerical analysis shows atmospheric attenuation affects the generation rate of quantum key obviously. Depolarization effects caused by rainfall increases the quantum bit error rate.更多还原