Self-adaptive optical path compensation method of double-path plug-and-play quantum key distribution system

Abstract

The invention provides a self-adaptive optical path compensation method of a double-channel plug-and-play quantum key distribution system, and belongs to the technical field of quantum communication,which can solve the problem that an optical device in the existing double-channel plug-and-play quantum key distribution system is easily influenced by an external environment so that the system cannot efficiently and stably operate for a long time. Accurate control and compensation are carried out on control clock delay of a phase modulator at an Alice end, a phase modulator at a Bob end and single-photon detectors SPD0 and SPD1 for detecting photons at the Alice end;; and real-time compensation is carried out during starting and in the operation process respectively, so that the quantum keydistribution system can keep the working parameters of the core optical device in a better state before starting and operating each time, and the system can be kept in an efficient working state for along time so as to keep efficient and stable operation of the quantum key distribution system.

Description

technical field [0001] The invention relates to a quantum key distribution system, in particular to a quantum key distribution system after adaptive optical path compensation, and belongs to the technical field of quantum communication. Background technique [0002] Quantum key distribution (QKD) utilizes the basic principles of quantum mechanics to realize the secure distribution of keys. In recent years, QKD has developed rapidly and gradually entered the practical stage. QKD system is generally divided into three parts: physical layer, post-processing layer and control layer. The physical layer is the basis of the quantum key distribution system, responsible for the preparation, transmission and measurement of the quantum state, and the generation of the original key; the function of the post-processing layer is to convert the original key generated by the physical layer into the final security key, including screening, The process of bit error negotiation, security enh...

AI Technical Summary

Problems solved by technology

[0005] Aiming at the problem that the optical devices in the existing two-way plug-and-play quantum key distribution system are easily affected by the external environment, which leads to the problem that the system cannot run efficiently and stably for a long time, the present invention provides a two-way plug-and-play quantum key distribution system System Adaptive Optical Path Compensation Method

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