Quantum secure communication optical path

Abstract

The invention relates to a quantum secure communication optical path. Only two phase modulators are required to realize the preparation of all quantum states required for quantum communication, thereby reducing the complexity of the system. Meanwhile, the quantum secure communication realization scheme provided by the invention can be compatible with different quantum secure communication protocols such as BB84, reference frame irrelevance and the like, so as to truly realize the free switching of multiple protocols of a system. The problem of loss mismatch between the two arms of the interferometer is solved. It not only reduces the complexity of the existing quantum secure communication system and improves the stability of the system, but also can be compatible with different quantum secure communication protocols, which can better meet various application needs and promote the practicality and commercialization of quantum secure communication.

Description

technical field [0001] The invention relates to a quantum security communication implementation scheme, in particular to a novel optical path structure scheme for quantum state preparation and detection in quantum security communication. Background technique [0002] Since the first quantum secure communication protocol was proposed in 1984, quantum secure communication has developed very rapidly in theory, experiment, and engineering implementation. At present, the fastest clock frequency of quantum secure communication has reached more than 2GHz, and the longest transmission distance without relay has reached more than 400 kilometers. At the same time, the establishment and operation of quantum communication networks represented by my country's Micius quantum satellite, Beijing-Shanghai quantum trunk line, Japan's Tokyo quantum communication network, and the European Union's quantum network indicate that quantum communication has begun to be applied in engineering practice...

AI Technical Summary

Problems solved by technology

[0004] The problem to be solved by the present invention is to provide a new type of optical path for quantum secure communication, which solves the problem of mismatching the loss of the two arms of the interferometer, and at the same time, only two phase modulators are needed to realize all the quantum states required for quantum communication. The preparation of the system reduces the complexity of the system. At the same time, the quantum secure communication implementation scheme proposed by the present invention can be compatible with different quantum secure communication protocols such as BB84 and reference frame independent, and truly realizes the free switching of multiple protocols in one system.

Images