Random number sequence generation apparatus, quantum encryption transmitter, and quantum encryption communication system

A random number sequence generation apparatus comprising:

• a semiconductor laser device repeatedly generating a pulsed laser beam having a disordered phase for each pulse through pulse oscillation;
• an interferometer including a first transmission line and a second transmission line that have mutually-different transmission line lengths, a first port connected to an input terminal side of the first transmission line and the second transmission line and to which the pulsed laser beam is input, a second port that is connected to an output terminal side of the first transmission line and the second transmission line and outputs the pulsed laser beam that is input to the first port and passes through the first transmission line or the second transmission line, and a third port that is connected to the input terminal side;
• a Faraday mirror connected to the second port and inputting the pulsed laser beam output from the second port to the second port again by reflecting the pulsed laser beam;
• a photodiode connected to the third port, to which interference light of the pulsed laser beam that is input to the second port by the Faraday mirror and passes through the first transmission line or the second transmission line is input, and outputting an electrical signal in accordance with the input of the interference light;
• and
• a processing circuit,
• wherein the processing circuit is configured to generates a random number sequence on the basis of a magnitude relationship between a signal intensity of the electrical signal and a threshold set in advance.