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DC modulation quantum key distribution phase decoding method, device and system based on polarization orthogonal rotation

A quantum key distribution, polarization orthogonal technology, applied in key distribution, 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 polarization orthogonal rotation to solve the problem of unstable phase decoding interference caused by polarization-induced fading in phase-encoded quantum key distribution applications

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  • DC modulation quantum key distribution phase decoding method, device and system based on polarization orthogonal rotation
  • DC modulation quantum key distribution phase decoding method, device and system based on polarization orthogonal rotation

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Embodiment Construction

[0079] 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.

[0080] A kind of direct current modulation quantum key distribution phase decoding method based on polarization orthogonal rotation of a preferred embodiment of the present invention is as follows: figure 1 As shown, it specifically includes the following steps:

[0081] Step S101 : splitting an incoming light pulse of any polarization state into a first light pulse and a second light pulse.

[0082] Specifically, the incident input light pulse is...

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Abstract

The invention discloses a DC modulation quantum key distribution phase decoding method, device and system based on polarization orthogonal rotation. The method comprises the steps: splitting one incident input optical path in any polarization state into two optical pulses, and performing the phase decoding of the two optical pulses. The phase decoding of each pulse comprises the steps: splitting the optical pulse into two sub-optical pulses; transmitting the two sub-optical pulses on two sub-optical paths, and combining the two sub-optical pulses for outputting, wherein at least one of the twosub-optical paths comprises at least one polarization orthogonal rotation device, and the difference between the phase differences, transmitted through the two sub-optical paths, of two cross-polarization states of the optical pulse is controlled to be an integer multiple of 2*pi, and the DC phase modulation of one of the two sub-optical pulses obtained through the splitting of the optical pulseis performed. According to the decoding scheme, the method can resist the polarization-induced decay, and is suitable for a high-speed quantum key distribution system with environmental interference.

Description

technical field [0001] The present invention relates to the technical field of optical transmission secure communication, in particular to a polarization orthogonal rotation-based direct current modulation quantum key distribution phase decoding method, a device 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 securit...

Claims

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Application Information

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