| 摘要 |
PROBLEM TO BE SOLVED: To provide a receiver for quantum key delivery that does not require a random number generator and two single photon detectors operate.SOLUTION: An input photon is detected by either a first single photon detector 41 or a second single photon detector 42 after going through any one path of first and second paths from a half mirror 20 leading to the single photon detector 41 and third and fourth paths from the half mirror leading to the second single photon detector 42, delay time difference of T/n (n is an integer of 2 or more) is given to between a photon that goes through the first path and a photon that goes through the second path, and delay time difference of T/n is given to between a photon that goes through the third path and a photon that goes through the fourth path. |
