Quantum secure communication optical path

A technology of quantum secure communication and optical path, applied in the field of quantum secure communication implementation scheme, can solve problems such as the mismatch of the loss of the two arms of the interferometer, and achieve the effect of promoting practicality, avoiding poor stability, and improving stability

Inactive Publication Date: 2019-01-22
NAT UNIV OF DEFENSE TECH
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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 prep

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  • Quantum secure communication optical path
  • Quantum secure communication optical path

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Embodiment Construction

[0010] like figure 1 Shown is a concise structure diagram of the input and output of the sender in this quantum secure communication implementation scheme, mainly including lasers, intensity modulators, circulators, 2*2 beam splitters, polarization beam splitters, phase modulator I, Faraday mirrors, phase It is composed of shifter, 1*2 beam combiner, phase modulator II, filter and attenuator. The present invention is specifically implemented as follows:

[0011] 1. The optical pulse signal generated by the laser is input to the intensity modulator, and the intensity modulator randomly modulates the amplitude of the optical pulse to generate the decoy state required for quantum secure communication. The output optical pulse signal of the intensity modulator is input to the port ① of the circulator and output from the port ② of the circulator.

[0012] 2. The optical signal output from port ② of the circulator is input to port ① of the 2*2 beam splitter, 50% of the optical sig...

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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...

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Application Information

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IPC IPC(8): H04B10/70H04B10/85
CPCH04B10/70H04B10/85
Inventor 孙仕海
Owner NAT UNIV OF DEFENSE TECH
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