A 1550 nm single-photon detector for long-distance fiber-optic quantum cryptography

摘要

We report a thermoelectrically cooled gated-mode single-photon detector operating at 1550 nm. The obtained quantum efficiency (～11.6%) and the dark count probability (～2×10{sup}(-5)) per gate makes it possible to realize long-distance fiber-Optic quantum cryptography with a small quantum bit-error rate.