A Long-Distance Continuous Variable Quantum Key Distribution Method Based on Gaussian Modulated Coherent States

A quantum key distribution and Gaussian modulation technology, applied in the field of quantum key distribution, can solve the problems of difficulty in detection, leakage, low signal-to-noise ratio, etc., and achieve the effect of reducing excessive noise and high negotiation efficiency

CN105024809BActive Publication Date: 2018-05-04上海循态量子科技有限公司
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2018-05-04

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Abstract

The present invention provides a long-distance continuous variable quantum key distribution method based on Gaussian modulation coherent state, including: Step A: The continuous variable initial key distribution step refers to using the sender Alice to perform Gaussian modulation through the coherent state and pass through the optical fiber After the long-distance transmission of the channel, the receiving party Bob performs demodulation and detection to obtain the initial continuous key data; Step B: refers to using the data post-processing algorithm to preprocess, error correct and enhance the security of the initial continuous key data obtained, Get the ultimate secure binary bit key. The invention can extend the safe communication distance of the CVQKD system based on Gaussian modulation coherent state to 100-150km.
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Description

technical field

[0001] The present invention relates to quantum key distribution, in particular, to a long-distance continuous variable quantum key distribution method based on Gaussian modulation coherent state, especially a method for optimizing the over-noise control, homodyne detection and data post-processing of the CVQKD system Technology for long-distance CVQKD communication. Background technique

[0002] Since the academic community first proposed the use of continuous variables for quantum communication in 1999, many scholars at home and abroad have proposed many continuous variable quantum secure communication protocols, especially CVQKD (continuous variable quantum key distribution) has attracted great attention. CVQKD allows two communicating parties, Alice and Bob, to obtain keys through quantum channels and authenticated classical channels. Unlike DVQKD (Discrete Variable Quantum Key Distribution), in the CVQKD protocol, Alice uses Gaussian modulation to modul...

Examples

Embodiment Construction

[0033] 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.

[0034] The invention discloses a long-distance continuous variable quantum key distribution method based on Gaussian modulation coherent state, comprising the following steps:

[0035] Step A: The continuous variable initial key distribution step, specifically: use the sender Alice to perform Gaussian modulation through the coherent state and perform long-distance transmission through the optical fiber channel, and then the receiver Bob will perform demodulation and detection to obtain the initial contin...