Nonlatching Superconducting Nanowire Single-Photon Detection with   Quasi-Constant-Voltage Bias
  Latching is a serious issue in superconducting nanowire single-photon detector (SNSPD) technology. By extensively studying the electrical transportation characteristics of SNSPD with different bias schemes, we conclude that latching is a result of the improper bias to SNSPD. With the quasi-constant-voltage bias scheme, the intrinsic nonlatching nature of SNSPD is observed and discussed. The SNSPD working in the nonlatching bias shows a smaller jitter and a higher pulse amplitude than that in the previous anti-latching method. The quantum efficiency of SNSPD with the pulsed photon frequency up to 3 GHz is measured successfully, which further proves the nonlatching operation of SNSPD. 
Deng-Kuan Liu, Si-Jing Chen, Li-Xing You, Yong-Liang Wang, Shigehito   Miki, Zhen Wang, Xiao-Ming Xie, and Mian-Heng Jiang
cond-mat.supr-con quant-ph