PT Unknown
AU Zolotov, P
   Divochiy, A
   Vakhtomin, Y
   Moshkova, M
   Morozov, P
   Seleznev, V
   Smirnov, K
TI Photon-number-resolving SSPDs with system detection efficiency over 50% at telecom range
SE Proc. AIP Conf.
PY 2018
BP 020019
VL 1936
IS 1
DI 10.1063/1.5025457
DE NbN PNR SSPD; SNSPD
AB We used technology of making high-efficiency superconducting single-photon detectors as a basis for improvement of photon-number-resolving devices. By adding optical cavity and using an improved NbN superconducting film, we enhanced previously reported system detection efficiency at telecom range for such detectors. Our results show that implementation of optical cavity helps to develop four-section device with quantum efficiency over 50% at 1.55 µm. Performed experimental studies of detecting multi-photon optical pulses showed irregularities over defining multi-photon through single-photon quantum efficiency.
ER