GENERATOR FOR PRODUCING PHOTON NUMBER STATE

摘要

An apparatus is provided for generating a predetermined number of photons, particularly one photon, at a definite time and at scheduled times for quant um communications. The apparatus comprises a source for generating a pair of photons including a signal photon and an idler photon that are mutually correlated in time of generation; a detector for measuring the number of idl er photons; a control device for controlling a gate device according to the number of photons measured by the detector; and a gate device for controllin g the emission of signal photons.