【摘要】 分析了1.55μm升频单光子探测量子密钥分配(QKD)系统的性能,讨论了升频单光子探测器的主要参数:量子效率和暗计数与抽运功率的关系.比较了BB84协议、BBM92协议和DPSK协议的光纤QKD系统的性能:安全通信速率与距离的关系,通过比较得出升频探测器优于传统的InGaAs/InP雪崩二极管单光子探测器,用升频探测器后的通信距离能比传统的大两倍以上,能很好改善量子通信系统的性能.更多还原

【Abstract】 The performance of various quantum-key-distribution(QKD) systems is analyzed using 1.55 μm up-conversion single-photon detector.The dependence of quantum efficiency and dark count rate change on the pump power was also discussed.The comparison is based on the secure communication rate as a function of distance for three QKD protocols:the Bennett-Brassard 1984,the Bennett-Brassard-Mermin 1992,and the coherent differential-phase-shift keying protocols.We show that the up-conversion detector allows for higher communication rate and longer communication distance than the commonly used InGaAs/InP APD for all three QKD protocols,and the properties of quantum key distribution system can be greatly improved by this detector.更多还原