Method, system and storage medium for modulation noise suppression in cvqkd system
A technology for modulating noise and intensity modulators, applied in transmission systems, electromagnetic wave transmission systems, electrical components, etc., can solve problems such as deteriorating system performance
Active Publication Date: 2020-12-22
上海循态量子科技有限公司
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At the same time, these imperfections will introduce a noise that deteriorates the performance of the system, that is, modulation noise
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[0167] 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.
[0168] A method for modulation noise suppression in a CVQKD system provided according to the present invention, comprising:
[0169] Signal separation step: the optical signal modulated by the intensity modulator in the CVQKD system is separated by the beam splitter to obtain the separated optical signal, and the separated optical signal is output;
[0170] Signal conversion step: According to the received separated optical signal, the Homodyne detector outputs the voltage signal U in the form of a volt...
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The invention provides a modulation noise suppression method and system in a CVQKD system and a medium. The method comprises the steps: a signal separation step: carrying out the separation of an optical signal modulated by an intensity modulator in the CVQKD system through a beam splitter to obtain a separated optical signal, and outputting the separated optical signal; and a signal conversion step: detecting according to the received separated optical signal and a Homodyne detector, outputting a voltage signal U in the form of a voltage signal, converting the voltage signal U into a discretedigital signal Ui through an analog-to-digital converter A / D, and outputting the discrete digital signal Ui. According to the scheme, the drift of the direct-current bias voltage and the half-wave voltage and the influence caused by the initial phase change of the intensity modulator can be eliminated in real time based on the key information, so that the direct-current bias point is accurately stabilized, and the extra overnoise caused by the drift of the direct-current bias point of the intensity modulator can be effectively inhibited.
Description
technical field [0001] The present invention relates to the technical field of noise suppression, in particular to a modulation noise suppression method, system and storage medium in a CVQKD system. Background technique [0002] In this great age of high informationization, with the vigorous development of emerging businesses such as e-commerce, mobile payment and Internet finance, information security issues have become the focus of attention. The secure communication technology based on quantum physics can realize the absolutely safe transmission of information, among which quantum key distribution (QKD, quantum key distribution) technology is the most mature branch of research. At present, quantum key distribution systems are mainly divided into two categories: discrete-variable quantum key distribution (DVQKD, discrete-variable quantum key distribution) systems and continuous-variable quantum key distribution (CVQKD, continuous-variable quantum key distribution) systems....
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IPC IPC(8): H04B10/079H04B10/54H04B10/61H04B10/70H04L9/08
Inventor 黄鹏郑异汪超曾贵华
Owner 上海循态量子科技有限公司