Quick single-photon detector with many avalanche photo diodes working on the time division  

作　　者：彭建 傅艺飞 姚立 尚旭东 逯志欣 杨伯君 于丽 

机构地区：[1]School of Science,Beijing University of Posts and Telecommunications

出　　处：《Chinese Optics Letters》2008年第5期320-322,共3页中国光学快报（英文版）

基　　金：the National Natu-ral Science Foundation of China (No.60378011 and 60578043);the Beijing Municipal Education Com-mission (No.XK100130637).

摘　　要：Due to the limit of response speed of the present single-photon detector, the code rate is still too low to come into practical use for the present quantum key distribution （QKD） system. A new idea is put up to design a quick single-photon detector. This quick single-photon detector is composed of a multi-port optic-fiber splitter and many avalanche photo diodes （APDs）. All of the ports with APDs work on the time division and cooperate with a logic discriminating and deciding unit driven by the clock signal. The operation frequency lies on the number N of ports, and can reach N times of the conventional single-photon detector. The single-photon prompt detection can come true for high repetition-rate pulses. The applying of this detector will largely raise the code rate of the OKD. and boost the commercial use.Due to the limit of response speed of the present single-photon detector, the code rate is still too low to come into practical use for the present quantum key distribution （QKD） system. A new idea is put up to design a quick single-photon detector. This quick single-photon detector is composed of a multi-port optic-fiber splitter and many avalanche photo diodes （APDs）. All of the ports with APDs work on the time division and cooperate with a logic discriminating and deciding unit driven by the clock signal. The operation frequency lies on the number N of ports, and can reach N times of the conventional single-photon detector. The single-photon prompt detection can come true for high repetition-rate pulses. The applying of this detector will largely raise the code rate of the OKD. and boost the commercial use.

关 键 词：Avalanche diodes Avalanches (snowslides) Codes (symbols) Computer networks Detectors Electromagnetic waves Gas detectors PHOTODETECTORS Ports and harbors Quantum chemistry Quantum cryptography Sensor networks SNOW 

分 类 号：TN31[电子电信—物理电子学]