Multi-party double-field quantum key distribution protocol implementation method and system

• Main Authors: XU NING, ZHAO NAN, HE XIANDENG, KWON DONG-HYO, YI YUNHUI, ZHU CHANGHUA, CHEN NAN
• Format: Patent
• Language: Chinese; English
• Published: 06.05.2022
• Subjects: ELECTRIC COMMUNICATION TECHNIQUE; ELECTRICITY; TRANSMISSION; TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHICCOMMUNICATION

The invention belongs to the technical field of quantum information communication, and discloses a multi-party double-field quantum key distribution protocol implementation method and system, and the method comprises the steps: carrying out the W4 state measurement of a coded light pulse through a W state analyzer at a measurement end, and enabling an input signal state to be projected to the W4 state, uniquely distinguishing a group of W4 states according to a response result of a single-photon detector in the W-state analyzer, and obtaining a secret key by a communication user through screening; a double-field quantum key distribution protocol and a W-state analyzer are combined to realize communication among users in four parties, and when a detection response result published by an untrusted measurement end is an effective detection response, any two participants in four participants disclose own information bits, and the other two participants can obtain key bits. The total probability of successful dete