Patent ID: 8155318

Claim:
A quantum cryptography communication system carrying out bit string commitment using a quantum, comprising: a quantum communication channel transmitting the quantum; a classical communication channel transmitting a bit string; a sending device sending the quantum to the quantum communication channel and sending the bit string to the classical communication channel; and a receiving device receiving the quantum from the quantum communication channel and receiving the bit string from the classical communication channel; wherein the sending device includes; a sending device controlling unit inputting/outputting a bit string having a plurality of bits to be committed which is a target of commitment; a carrier sending unit inputting the data from the sending device controlling unit sending a quantum corresponding to the bit string to be committed to the quantum communication channel; and a data sending unit sending a whole of the bit string to be committed of which the quantum has been sent by the carrier sending unit to the classical communication channel; and wherein the receiving device includes; a carrier receiving unit receiving the quantum sent to the quantum communication channel by the carrier sending unit and observing a quantum state of the quantum; a memory unit storing an observation result of the quantum state observed by the carrier receiving unit; a data receiving unit receiving the bit string to be committed sent to the classical communication channel by the data sending unit; and a receiving device controlling unit comparing the observation result stored by the memory unit with the bit string to be committed received by the data receiving unit.