Receiver for quantum key distribution and method of using single photon detector

摘要

There is provided a quantum-key-distribution receiving device used in a quantum key distribution system that utilizes a pair of quantum-entangled photons including a signal photon and an idler photon, the quantum-key-distribution receiving device including a single-photon detector in which a secure-key generation rate is dependent on a first performance index &eegr;/(1+Pa), &eegr; denoting a detection efficiency and Pa denoting an after-pulse probability.