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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.
The performance of a 1.55μm ascending single-photon detection quantum key distribution (QKD) system is analyzed and the main parameters of the ascending single-photon detector are discussed: the relationship between quantum efficiency and dark-count and pumping power.The BB84, BBM92 Protocol and DPSK protocol performance of optical fiber QKD system: the relationship between safe communication speed and distance, by comparing the up-frequency detector is better than the traditional InGaAs / InP avalanche diode single-photon detector, with the up-frequency detector communication distance Can be more than twice as large as the conventional one, and can well improve the performance of the quantum communication system.