【摘要】 通过理论分析和计算,研究了光纤损耗、色散和单光子探测器暗计数等因素对量子密钥分发系统密钥传输率和误码率的影响。研究表明,光纤损耗是影响密钥传输率的主要因素。而量子比特误码率则与光纤损耗、色散、脉冲宽度、单光子探测器暗计数以及瑞利反向散射等因素有关。在实验中,应尽量降低光纤损耗、色散和单光子探测器的暗计数,同时选择适当的初始脉宽,从而提高密钥传输率并降低误码率,进而提高量子密钥分发系统的传输距离。更多还原

【Abstract】 The effects of fiber dispersion and loss and single-photon detector dark counts on key transmission rate and BER of quantum key distribution system through theoretical analysis and computation are studied . Research demonstrates that fiber loss is the main factor that influences quantum key transmission rate, while quantum BER is related to fiber loss, dispersion, pulse width, dark counts and Rayleigh backscattering. In the experiment, we should try to reduce fiber loss, dispersion and single-photon detector dark counts, and meanwhile choose appropriate initial pulse width, thereby enhancing quantum key transmission rate and reducing BER, thus effectively enhance the transmission distance of quantum key distribution system.更多还原