quantum key distribution method and quantum key distribution system

摘要

PROBLEM TO BE SOLVED: To provide a quantum key delivery system having a monitor function of monitoring so that an expectation value of the number of generated correlation photon pairs is held constant for a long time, a function of extracting a clock signal for detection of arrival of a photon, and a polarization control function.;SOLUTION: The quantum key delivery system includes a correlation photon pair generation part 10, a correlation photon pair generation process control part 14, a control signal generation part 12, and a correlation photon pair reception part 16. The control signal generation part generates a first control signal 121-1S, first electric auxiliary signals 118-1S and 118-2S, a second control signal 502S, second electric auxiliary signals 119-1S and 119-2S, and a third control signal 501S. The first control signal is a signal for controlling intensity of excitation light. The second control signal is a signal for controlling polarization states of an idler light component and an auxiliary idler light component by a second polarization control device 602. The third control signal is a signal for controlling polarization states of a signal light component and an auxiliary signal light component by a first polarization control device 601.;COPYRIGHT: (C)2013,JPO&INPIT