Quantum Key Distribution in an Optical Fiber at Distances of up to 200 km and a Bit Rate of 180 bit/s

摘要

An experimental demonstration of a subcarrier-wave quantum cryptography system with super-conducting single-photon detectors (SSPDs) that distributes a secure key in a single-mode fiber at distance of 25 km with a bit rate of 800 kbit/s, a distance of 100 km with a bit rate of 19 kbit/s, and a distance of 200 km with a bit rate of 0.18 kbit/s is described.