Optical-electric-optical mode MDI-QKD system synchronization device and method

• Main Authors: QUAN DONGXIAO, LIU YONGPING, ZHAO NAN, HE XIANDENG, YI YUNHUI, ZHU CHANGHUA, ZHANG ZIJIAN, CHEN NAN
• Format: Patent
• Language: Chinese; English
• Published: 14.04.2020
• Subjects: ELECTRIC COMMUNICATION TECHNIQUE; ELECTRICITY; MULTIPLEX COMMUNICATION; TRANSMISSION; TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHICCOMMUNICATION

The invention provides an optical-electric-optical mode MDI-QKD system synchronization device and method. The device comprises a synchronization optical pulse generation module, a first photoelectricconversion module, an encoding module, a time delay adjustment module, an electro-optical conversion module, a second photoelectric conversion module and a detection module. The method comprises the following steps: sending a synchronous optical pulse and a signal optical pulse to an Alice end and a Bob end, converting the pulses into synchronous electric pulses, coding the signal optical pulses,adjusting the time delay of the synchronous electric pulses, converting the synchronous electric pulses into synchronous optical pulses, transmitting the pulses to the detection module to be convertedinto synchronous electric pulses, and triggering a single-photon detector and an acquisition card to work. Compared with a mode of generating synchronous electric pulses in other QKD systems, the method has the advantages that