Automatic basic vector regulation system and automatic basic vector regulation method for quantum communication system

Abstract

The invention discloses an automatic basic vector regulation system and an automatic basic vector regulation method for a quantum communication system. The system is mainly applied in quantum communication to realize the automatic control of basic vector regulation, and is applicable to various laser communication systems requiring basic vector regulation. A specific orthogonal two-dimensional coordinate system which is called basic vector is introduced into the system as a standard for judging photon polarization state, and moreover, the coordinate system for judging the polarization state of signal light in the whole communication system is consistent. The automatic basic vector regulation system can solve the problem that the polarization direction of the signal light in quantum communication is changed because the direction of a telescope is changed during tracking, thus ensuring that a receiving end can correctly detect the polarization state of the signal light under the specific basic vector standard and that space scale quantum communication can be freely and smoothly carried out.

Description

technical field [0001] The present invention relates to free space quantum communication technology, in particular to a base vector automatic adjustment device and adjustment method for a quantum communication system, which is used to automatically adjust the polarization direction change of signal light caused by rough tracking in quantum communication . Background technique [0002] Space-scale quantum communication mainly relies on light quanta with a specific polarization state to transmit information, and a unified standard is required to judge the polarization state of light quanta. This system introduces a specific orthogonal two-dimensional coordinate system called a basis vector as a judgment photon The standard of the polarization state, and the coordinate system used to judge the polarization state of the signal light in the entire communication system is consistent. The transmitting end uses the basis vector as a standard to emit quantum light with polarization ...

AI Technical Summary

Problems solved by technology

[0017] The invention aims at the rotation of the signal light caused by the telescope lens barrel constantly changing the space angle due to tracking the satellite in the inter-satellite quantum communication, so that the signal receiving end cannot correctly detect the rotated light vector with a fixed base vector Information problem, providing an effective base vector automatic adjustment device and adjustment method

Solved the problem that the polarization direction of the signal light in the reflection loop changes due to the change of the space angle of the telescope in the quantum communication between the satellite and the earth, which leads to the problem that the receiving end cannot correctly detect the polarization state of the quantum light

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