Free space continuous variable quantum key distribution method and system

A quantum key distribution and free space technology, applied in the field of communication, can solve the problems of spot drift, free space continuous variable quantum key distribution, failure to make significant progress, communication system performance degradation, etc., to improve system performance and enhance distribution performance, the effect of reducing atmospheric effects

Active Publication Date: 2019-08-09
上海循态量子科技有限公司
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Problems solved by technology

Influencing factors in the atmosphere, such as air flow, scattering, climate, etc., have prevented significant progress in free-space continuous variable quantum key distribution
Especially when the laser is transmitted in the atmosphere, it is susceptible to the influence of atmospheric turbulence, resulting in random fluct

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  • Free space continuous variable quantum key distribution method and system
  • Free space continuous variable quantum key distribution method and system
  • Free space continuous variable quantum key distribution method and system

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Embodiment Construction

[0031] The present invention will be described in detail below in conjunction with specific embodiments. The following examples will help those skilled in the art to further understand the present invention, but do not limit the present invention in any form. It should be noted that those skilled in the art can make several changes and improvements without departing from the concept of the present invention. These all belong to the protection scope of the present invention.

[0032] Such as figure 1 As shown, a kind of free space continuous variable quantum key distribution method provided according to the present invention comprises:

[0033] Quantum signal sending step: use Gaussian modulation to modulate the quantum signal light, couple the modulated quantum signal light with local oscillator light to obtain coupled light, and send the coupled light through a free space channel.

[0034] Quantum signal receiving step: receiving the coupled light, and separating the quant...

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Abstract

The invention provides a free space continuous variable quantum key distribution method and system, and the method comprises the steps of modulating the quantum signal light through Gaussian modulation, coupling the modulated quantum signal light with the local oscillator light to obtain the coupling light, and sending the coupling light through a free space channel; receiving the coupling light,and separating the quantum signal light in the coupling light from the local oscillation light; and obtaining part of the separated local oscillation light, and correcting the separated quantum signallight according to the wavefront phase of the local oscillation light. According to the present invention, the influence of the atmospheric effects can be weakened, and the continuous variable quantum key distribution performance is improved.

Description

technical field [0001] The present invention relates to the field of communication technology, in particular to a method and system for distributing a continuous variable quantum key with free-space Gaussian modulation based on adaptive optics. Background technique [0002] Continuous variable quantum key distribution is a technology different from traditional communication. It mainly uses the uncertainty principle and the quantum state non-cloning theorem to realize the unconditional security of communication. Because of its potential advantages of being compatible with existing optical communication technologies, fiber channel continuous variable quantum key distribution has attracted many researchers to participate in the research. Free space continuous variable quantum key distribution is an important part of building a global quantum key distribution network. In order to better integrate and develop it with fiber channel continuous variable quantum key distribution, in ...

Claims

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Application Information

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IPC IPC(8): H04L9/08H04B10/516H04B10/70
CPCH04B10/516H04B10/70H04L9/0819H04L9/0852H04L9/0869
Inventor 黄鹏柴庚汪超曾贵华
Owner 上海循态量子科技有限公司
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