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DC modulation quantum key distribution phase decoding method, device and system based on 90-degree fusion phase difference control

A technology of quantum key distribution and DC modulation, which is applied to key distribution and can solve problems such as phase decoding interference instability

Active Publication Date: 2019-01-01
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 DC modulation quantum key distribution phase decoding method and device based on 90-degree fusion phase difference control (also called "phase difference control") to solve the problem of polarization in phase-encoded quantum key distribution applications. The Difficulty of Interferometric Instability in Phase Decoding Caused by Induced Fading

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  • DC modulation quantum key distribution phase decoding method, device and system based on 90-degree fusion phase difference control
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  • DC modulation quantum key distribution phase decoding method, device and system based on 90-degree fusion phase difference control

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[0073] 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 principles 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.

[0074] A kind of DC modulation quantum key distribution phase decoding method based on 90-degree fusion phase difference control of a preferred embodiment of the present invention is as follows: figure 1 As shown, it specifically includes the following steps:

[0075] Step S101 : splitting an incoming light pulse of any polarization state into a first light pulse and a second light pulse.

[0076] Specifically, the incident input light pulse is o...

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Abstract

The invention discloses a DC modulation quantum key distribution phase decoding method, device and system based on 90-degree fusion phase difference control. The method comprises the steps: splittingan incident input optical pulse in a random polarization state into two optical pulses and independently performing phase decoding of the two optical pulses. Phase decoding of each optical pulse includes the steps: splitting the optical pulse into two sub-optical pulses; transmitting the two sub-optical pulses on two sub-optical paths and combining them for outputting, wherein at least one of thetwo sub-optical paths comprises at least one 90-degree fusion point, and the phase different of the two orthogonal polarization states controlling the optical pulse of the path transmitted by the twosub-optical paths is an integer multiple of 2*pi in the splitting-to-combining process, and DC phase modulation is performed for one of the two sub-optical pulses obtained by splitting any of the optical pulses. The decoding scheme of the present invention is capable of resisting polarization induced fading and is suitable for use in a high speed quantum key distribution system where environmentalinterference exists.

Description

technical field [0001] The present invention relates to the technical field of optical transmission secure communication, in particular to a DC modulation quantum key distribution phase decoding method and device based on 90-degree fusion phase difference control, and a quantum key distribution system including the device. Background technique [0002] Quantum secure communication technology is a frontier hot field combining quantum physics and information science. Based on the quantum key distribution technology and the principle of one-time pad cryptography, quantum secure communication can realize the secure transmission of information in open channels. Quantum key distribution is based on physical principles such as the Heisenberg uncertainty relation in quantum mechanics and the quantum non-cloning theorem. It can safely share keys among users and detect potential eavesdropping behaviors. It can be applied to national defense, government affairs, Fields with high secur...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L9/08H04B10/70H04B10/524H04B10/532H04B10/556
CPCH04B10/70H04L9/0858H04B10/5561H04B10/532H04B10/524Y02D30/70
Inventor 许华醒
Owner CHINA ACADEMY OF ELECTRONICS & INFORMATION TECH OF CETC
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