Free space continuous variable quantum key distribution method and system

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 ...

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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 fluctuations in the wavefront of the transmitted beam, resulting in atmospheric turbulence effects such as spot drift and intensity fluctuation (flickering), resulting in a decrease in the quality of the transmitted beam, resulting in communication system problems. Performance degradation, seriously affecting system performance

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