A Multidimensional Negotiation Method for Discretely Modulated Continuous Variable Quantum Key Distribution

A quantum key distribution, one-party technology, applied in the field of continuous variable quantum key distribution, can solve problems such as insecurity, impact of post-processing process, inconsistency of original data, etc., and achieve the effect of efficient error correction

Active Publication Date: 2021-04-27
BEIJING UNIV OF POSTS & TELECOMM
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Problems solved by technology

This will have a certain impact on the post-processing process
First of all, similar to the Gaussian modulation system, due to the interference of loss, noise and eavesdroppers in the quantum channel, the original data of the two legal communication parties are inconsistent and insecure, but they are related

Method used

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  • A Multidimensional Negotiation Method for Discretely Modulated Continuous Variable Quantum Key Distribution
  • A Multidimensional Negotiation Method for Discretely Modulated Continuous Variable Quantum Key Distribution
  • A Multidimensional Negotiation Method for Discretely Modulated Continuous Variable Quantum Key Distribution

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specific Embodiment approach

[0013] The following examples specifically illustrate the method of the present invention. The present invention provides a multi-dimensional negotiation method used in discrete modulation continuous variable quantum key distribution, taking forward coordination as an example, the specific implementation method is as follows:

[0014] Firstly, the original discrete data X at the sender is normalized according to the dimension d of the multidimensional negotiation. Group each d raw data into a group and then normalize. The calculation method is as follows:

[0015]

[0016] Then X is on the unit sphere in hypergeometric space, and conforms to the uniform distribution among discrete points on the sphere. Then randomly generate d binary random numbers, whose normalized form is:

[0017]

[0018] Then calculate the mapping relationship M, which satisfies the following relationship:

[0019] M(x,u)·x=u

[0020] Next, the mapping relationship M is sent to the receiving en...

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Abstract

The invention provides a multi-dimensional negotiation method used in discrete modulation continuous variable quantum key distribution. The specific implementation steps of the method are as follows: Step 1: Normalize the original data according to the dimension of multi-dimensional negotiation, and then randomly select a uniform distribution Binary random number, calculate the mapping relationship between the two, and send it to the other party. Step 2: Receive the mapping relationship, normalize the original data, and do the same data rotation. Step 3: Both parties select an appropriate error correction code, and one party calculates and sends side information to help the other party decode and correct errors. The method in the invention can realize an efficient multi-dimensional negotiation algorithm for post-distribution processing of the discrete modulation continuous variable quantum key, so that both legal communication parties can obtain a consistent key.

Description

technical field [0001] The invention relates to the technical field of continuous variable quantum key distribution, and is mainly a negotiation error correction method applied to the coordination of post-processing data in a discrete modulation system. This method can realize efficient and safe data coordination algorithm. Background technique [0002] Continuous-variable Quantum Key Distribution (CV-QKD) is a relatively mature technology in quantum information technology, which can provide secure keys for encryption and decryption, and has great application advantages. [0003] The discrete modulation CV-QKD system has certain advantages over the Gaussian modulation CV-QKD system, for example, only a small number of coherent states need to be prepared to meet the requirements. Correspondingly, subsequent processing needs to be changed accordingly. The original data at the sending end is not a continuous Gaussian distribution, but a discrete Gaussian distribution, that is...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L9/08
CPCH04L9/0858
Inventor 张一辰王翔宇喻松郭弘
Owner BEIJING UNIV OF POSTS & TELECOMM
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