单光子调制锁定Fabry-Perot腔  

Fabry-Perot cavity locked by using single photon modulation

作　　者：王晶晶[1] 何博[1] 于波[1] 刘岩[1] 王晓波[1] 肖连团[1] 贾锁堂[1] 

机构地区：[1]山西大学激光光谱实验室,量子光学与光量子器件国家重点实验室,太原030006

出　　处：《物理学报》2012年第20期271-275,共5页Acta Physica Sinica

基　　金：国家重点基础研究发展计划(批准号:2012CB921603,2010CB923103);国家自然科学基金(批准号:11174187,61178009,60908019,10934004)、国家自然科学基金创新研究群体科学基金(批准号:60821004);山西省科技基础条件平台建设项目(批准号:2011091016);山西省高等学校中青年拔尖创新人才支持计划;山西省高等学校优秀创新团队支持计划资助的课题~~

摘　　要：基于Fabry-Perot(FP)腔的量子密钥分配系统在相位编码的量子密钥分配应用方面具有优势,把FP腔锁定在携带密钥信息的单光子光学频率上决定着密钥的实用安全.提出利用单光子调制解调的方法锁定FP腔.使用工作于盖革模式的单光子探测器探测单光子(平均光子数为0.1),对离散的单光子响应脉冲累计锁定放大,获得的鉴频信号信噪比达112,锁定后FP腔透射光频率起伏为2 MHz.Fabry-Peort （FP） cavity-based quantum key distribution has some advantages in the phase-coded quantum key distribution （QKD）. Locking the frequency of the FP cavity transmission to the frequency of single photon carrying the key information determines the security of QKD. In this paper, we propose an FP cavity locked to a single photon （the mean photon number is about 0.1） frequency using single-photon modulation/demodulation method. The single photon detector working in the Geiger mode is used to detect modulated single photons then direactly demodulated by the lock-in amplifier. The discrete single photon response pulses accumulated fulfills the phase sensitive detection, and the signal-to-noise ratio of signal frequency discrimination is up to 112. The transmission frequency fluctuation of the locked FP is limited to 2 MHz.

关 键 词：单光子 Fabry—Perot腔 频率锁定 

分 类 号：O431.2[机械工程—光学工程] TN918[理学—光学]