用于高速量子密码系统的1.25 GHz InGaAs/InP单光子探测器的研制  

A 1.25 GHz InGaAs/InP Single-Photon Detector for High-Speed Quantum Cryptography

作　　者：梁晓磊[1] 蒋文浩[1] 刘建宏[2] 张军[2] 陈增兵[2] 金革[1] 

机构地区：[1]中国科学技术大学近代物理系,安徽合肥230026 [2]合肥微尺度物质科学国家实验室,安徽合肥230026

出　　处：《中国激光》2012年第8期232-236,共5页Chinese Journal of Lasers

基　　金：国家863计划(2011AA010802);国家自然科学基金委杰出青年科学基金(61125502)资助课题

摘　　要：随着量子密码领域的快速发展,近红外单光子探测器的研究已经成为该领域的研究重点和技术制高点。报道了一种基于正弦门控与滤波技术的InGaAs/InP雪崩光电二极管(APD)高速单光子探测器,门控频率达到1.25GHz。在探测效率为10.3%时,暗计数概率为1.3×10-6/gate,后脉冲概率为5.6×10-5/ns。这种高速单光子探测器将大幅度提升量子密码系统的两个关键指标——密钥率和传输距离,为下一代高速量子密码系统的实用化应用奠定了基础。With the rapid development of quantum cryptography, infrared single-photon detection becomes the key technology in this research field. A high-speed InGaAs/InP avalanche photodiode （APD） is presented based on single- photon detector with a 1.25 GHz gating frequency, using the technique of sine wave gating and filtering. When the detection efficiency is 10. 3%, dark count probability per gate is 1. 3 × 10-6 and the afterpulse probability per nanosecond is 5.6 × 10-5. This kind of detector can significantly enhance the performance of quantum cryptosystem in terms of secret key rate and transmission distance, which paves the way towards the practical applications of the next generation quantum cryptography.

关 键 词：探测器 单光子探测 正弦门控滤波技术 InGaAs/InP雪崩光电二极管 量子密码 

分 类 号：TN215[电子电信—物理电子学]