Pulse-gated mode of commercial superconducting nanowire single photon detectors  

作　　者：Fan Liu Mu-Sheng Jiang Yi-Fei Lu Yang Wang Wan-Su Bao 刘帆;江木生;陆宜飞;汪洋;鲍皖苏(Henan Key Laboratory of Quantum Information and Cryptography,SSF IEU,Zhengzhou 450001,China;Synergetic Innovation Centre of Quantum Information and Quantum Physics,University of Science and Technology of China,Hefei 230026,China)

机构地区：[1]Henan Key Laboratory of Quantum Information and Cryptography,SSF IEU,Zhengzhou 450001,China [2]Synergetic Innovation Centre of Quantum Information and Quantum Physics,University of Science and Technology of China,Hefei 230026,China

出　　处：《Chinese Physics B》2021年第4期144-150,共7页中国物理B（英文版）

基　　金：Project supported by the National Natural Science Foundation of China(Grant No.61605248);the National Basic Research Program of China(Grant No.2013CB338002)。

摘　　要：High detection efficiency and low intrinsic dark count rate are two advantages of superconducting nanowire single photon detectors(SNSPDs).However,the stray photons penetrated into the fiber would cause the extrinsic dark count rate,owing to the free running mode of SNSPDs.In order to improve the performance of SNSPDs in realistic scenarios,stray photons should be investigated and suppression methods should be adopted.In this study,we demonstrate the pulsegated mode,with 500 kHz gating frequency,of a commercial SNSPD system for suppressing the response of stray photons about three orders of magnitude than its free-running counterpart on the extreme test conditions.When we push the gating frequency to 8 MHz,the dark count rate still keeps under 4% of free-running mode.In experiments,the intrinsic dark count rate is also suppressed to 4.56 × 10^(-2) counts per second with system detection efficiency of 76.4372%.Furthermore,the time-correlated single-photon counting analysis also approves the validity of our mode in suppressing the responses of stray photons.

关 键 词：quantum detector superconducting nanowire pulse gated dark count rate 

分 类 号：TB383.1[一般工业技术—材料科学与工程]