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Dynamic polarization control method and system in continuous variable quantum key distribution system and medium

A technology of quantum key distribution and polarization control, applied in key distribution, can solve problems such as difficult polarization demultiplexing, and achieve the effect of ensuring effective operation

Pending Publication Date: 2021-05-14
上海循态量子科技有限公司 +1
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  • Claims
  • Application Information

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Problems solved by technology

However, in the weak channel continuous variable quantum key distribution system, due to the random attenuation of the signal by the channel, that is, fading, its polarization demultiplexing becomes a difficult problem

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  • Dynamic polarization control method and system in continuous variable quantum key distribution system and medium

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Embodiment

[0038] The present invention provides a dynamic polarization control scheme for weak channel transmission in the provided continuous variable quantum key distribution system. Firstly, the quantum signal and the local oscillator pulse sequence are transmitted. The quantum signal transmission structure is as follows: figure 1 As shown in Fig. 1, at the sending end, firstly, the laser light emitted by the continuous laser is input into the intensity modulator to complete chopping and generate a sequence of optical pulses. The pulse train is then split into beams, one of which is modulated and delayed to generate a quantum signal. Simultaneously transmit the local oscillator and quantum signals through polarization multiplexing, and send them to the receiving end through a weak channel.

[0039] After receiving the signal, the receiving end adjusts the polarization through the polarization controller. The polarization-adjusted light is split into two paths, one for direct detecti...

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Abstract

The invention provides a dynamic polarization control method and system in a continuous variable quantum key distribution system, and a medium. The method comprises the following steps: 1, realizing synchronous transmission of a quantum signal and a local oscillator signal through a time and polarization multiplexing mode; and 2, performing polarization demultiplexing on the quantum signal and the local oscillator signal through dynamic polarization control. According to the method, polarization demultiplexing can be realized under the condition of channel fading, and continuous variable quantum key distribution polarization demultiplexing of weak channel transmission can be accurately realized, so that subsequent coherent detection can be realized, and effective operation of continuous variable quantum key distribution of the weak channel is ensured.

Description

technical field [0001] The present invention relates to the technical field of quantum key distribution, in particular to a dynamic polarization control method, system and medium in a continuous variable quantum key distribution system. In particular, it relates to a dynamic polarization control method for weak channel transmission in a continuous variable quantum key distribution system. Background technique [0002] With the advent of the information age, the continuous development of communication technology provides a fast channel for information transmission, and people pay more and more attention to the security of information during transmission. With the proposal and development of quantum computers, the computational security that classical cryptography relies on will face enormous challenges. The quantum key distribution scheme based on the basic principles of quantum mechanics has theoretical unconditional security and can guarantee the security of communication ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L9/08
CPCH04L9/0858
Inventor 黄鹏汪诗寓曾贵华
Owner 上海循态量子科技有限公司