PT Unknown AU Verevkin, A Xu, Y Zheng, X Williams, C Sobolewski, R Okunev, O Smirnov, K Chulkova, G Korneev, A Lipatov, A Gol’tsman, GN TI Superconducting NbN-based ultrafast hot-electron single-photon detector for infrared range SE Proc. 12[super:th] Int. Symp. Space Terahertz Technol. PY 2001 BP 462 EP 468 DE NbN SSPD; SNSPD ER