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Phase decoding method, phase decoding receiving device and quantum key distribution system

A technology of a receiving device and a decoding method, which is applied in the field of optical transmission secure communication, can solve problems such as unstable output results, achieve low insertion loss, reduce requirements and complexity, and reduce insertion loss.

Pending Publication Date: 2018-10-12
CHINA ACADEMY OF ELECTRONICS & INFORMATION TECH OF CETC
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Problems solved by technology

[0004] The main purpose of the present invention is to propose a phase decoding method, a phase decoding receiving device and a quantum key distribution system to solve the problem of unstable output results caused by the aforementioned polarization state changes in the application of phase encoding quantum key distribution

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  • Phase decoding method, phase decoding receiving device and quantum key distribution system
  • Phase decoding method, phase decoding receiving device and quantum key distribution system
  • Phase decoding method, phase decoding receiving device and quantum key distribution system

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Embodiment Construction

[0036] Preferred embodiments of the present invention will be specifically described below in conjunction with the accompanying drawings, wherein the accompanying drawings constitute a part of the application and are used together with the embodiments of the present invention to explain the principle of the present invention. For the sake of clarity and simplicity, detailed descriptions of known functions and structures of the devices described herein will be omitted when it may obscure the subject matter of the present invention.

[0037] A phase decoding method of a preferred embodiment of the present invention is as follows: figure 1 shown, including the following steps:

[0038] Step S101: polarization-splitting one input light pulse with any polarization state into a first transmission light pulse and a second transmission light pulse.

[0039] Specifically, the polarization state of the incident input light pulse may be any polarization state, and the polarization state...

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Abstract

The invention provides a phase decoding method, a receiving device and a quantum key distribution system. The method comprises the steps that an incident input light pulse is subjected to polarizationsplitting to be split into a first transmission light pulse and a second transmission light pulse; each of the first transmission light pulse and the second transmission light pulse is subjected to phase decoding and then output through two associated light sub-paths; an output light pulse from one of the two light sub-paths associated with the first transmission light pulse is directly output for detection, and an output light pulse from one of the two light sub-paths associated with the second transmission light pulse is directly output for detection. According to the method, the influencesgenerated on the system stability by random changes of the light pulse polarization state can be effectively solved, and stable phase decoding capable of resisting environment interference is achieved; and in addition, an unequal-arm Mach-Zehnder interferometer can be adopted, the light pulse only needs to pass through a phase modulator once during decoding, the insertion loss of the receiving end is reduced, and the system efficiency is improved.

Description

technical field [0001] The invention relates to the technical field of optical transmission secure communication, in particular to a phase decoding method, a phase decoding receiving device and a quantum key distribution system. Background technique [0002] Based on quantum key distribution technology and the principle of one-time pad cryptography, quantum secure communication can realize information security in open channels, and it is gradually applied. For the phase-encoded quantum key distribution system based on the unequal arm interferometer, during the transmission of the optical pulse through the optical fiber quantum channel, due to the non-circular symmetry of the cross-section of the optical fiber and the uneven distribution of the core refractive index along the radial direction, etc. Non-ideal conditions, and the birefringence effect caused by the influence of temperature, strain, bending, etc. in the actual environment of the optical fiber, the polarization st...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L9/08H04B10/70
CPCH04B10/70H04L9/0852H04L9/0858
Inventor 许华醒程旭升莫小范
Owner CHINA ACADEMY OF ELECTRONICS & INFORMATION TECH OF CETC
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