Clock synchronization system and method

Abstract

The invention relates to the field of quantum communication, and provides a clock synchronization system and method. The clock synchronization system includes a signal transmitting end and a signal receiving end, wherein the signal transmitting end includes a first laser pulse generator, a second laser pulse generator and an optical coupling module; the signal receiving end includes an optical separation module, a photoelectric conversion module and an optical detection module; and the signal receiving end is used to receive coupled optical signals, and is used to separate, detect and analyzethe coupled optical signals according to the wavelength difference of the coupled optical signals. According to the scheme of the invention, the optical coupling module at the signal transmitting endcouples lasers with different wavelengths to the signal receiving end, the optical separation module separates the coupled optical signals according to the difference of the wavelengths, and the optical detection module detects and processes the signals, so that the time reference cannot be affected by the optical path difference, the design complexity of the electronics and bundled software can be simplified, and the influence of the optical path change of the receiving end on the time resolution of the system can be avoided.

Description

technical field [0001] The invention relates to the field of quantum communication, in particular to a clock synchronization system and method. Background technique [0002] At present, the main clock synchronization schemes used in quantum communication are GPS clock synchronization and cable clock synchronization. [0003] Although the atomic precision of the GPS satellite itself is very high, the GPS timing precision provided to the user is 100ns. For long-distance communication experiments, especially those based on free space channels, the optical path from the transmitting end to the receiving end will change accordingly due to the local refractive index changes in the atmosphere caused by various convection conditions in the atmosphere. The GPS clock synchronization solution measures absolute time, so the optical path change introduced by the receiving end will have a certain impact on the system time fluctuation, resulting in a decrease in clock synchronization accu...

AI Technical Summary

Problems solved by technology

[0005] Based on this, it is necessary to provide a clock synchronization system and method for the problems of reduced accuracy caused by optical path changes, high cost, and limited application occasions.

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