Superconducting Single-Photon Detector for Near- and Middle ir Wavelength Range

摘要

Presented in this paper are the results of research of NbN-film superconducting single-photon detector. At 2 K temperature, quantum efficiency in the visible light (0.56 mum) reaches 30-40 %. With the wavelength increase quantum efficiency decreases and comes to ~20% at 1.55 mum and ~0.02% at 5.6 mum. Minimum dark counts rate is 2times10^-4s^-1. The jitter of detector is 35 ps. The detector was successfully implemented for integrated circuits non-invasive optical testing. It is also perspective for quantum cryptography systems