Efficient error checking and private key amplification method for continuous variable quantum key distribution

A quantum key distribution and error checking technology, which is applied in the field of continuous variable quantum key distribution, can solve the problems of slow running speed, high system complexity, and many times of communication, so as to improve processing speed, improve execution efficiency, reduce The effect of postprocessing complexity

Active Publication Date: 2018-11-27
BEIJING UNIV OF POSTS & TELECOMM
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Problems solved by technology

The original method needs to be carried out step by step, the system complexity is high, the operation speed is slow, and the number of communications is required

Method used

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  • Efficient error checking and private key amplification method for continuous variable quantum key distribution
  • Efficient error checking and private key amplification method for continuous variable quantum key distribution

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Embodiment Construction

[0022] The specific implementation of the method will be described in detail below in conjunction with the accompanying drawings.

[0023] First, calculate the final output length according to the maximum tolerable error probability set by the system and the security code rate estimated by the system. On this basis, a general hash function is constructed. Then it acts on the data after the error correction judgment is successful to get the output result.

[0024] Suppose the maximum tolerable error probability of the system is e, the security code rate of the system is k, the data length after error correction is n, the security key length is l=n×k, the number of error check output bits is m, and the data after error correction is a, the constructed general hash function is H, and the relationship between e and m is determined by the selected general hash function. For example, when the Toeplitz matrix is ​​selected, it satisfies the following relationship:

[0025]

[00...

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Abstract

The invention provides an efficient error checking and private key amplification method for continuous variable quantum key distribution. The method particularly comprises the following steps: 1, after an error correction process in continuous variable quantum key distribution postprocessing is completed, two sides enable data after successful decoding decision to interact with a general hash function; 2, the two sides disclose partial results in the first step for comparison, wherein the partial results are used to complete an error checking function; and 3, if the comparison result is inconsistency, the group of data is discarded, and if the result is consistency, the undisclosed partial data are kept as a final key, and the private key amplification function is completed. The method inthe invention can combine the error checking step and the private key amplification step, one-time classic communication process can be reduced, the postprocessing process is simplified, and the speedof the system is improved.

Description

technical field [0001] The invention relates to the technical field of continuous variable quantum key distribution, and mainly relates to an efficient error checking and private key amplification method applied in the post-processing of a continuous variable quantum key distribution system. The method can combine the steps of error checking and private key amplification without affecting system security. It can improve the post-processing rate and efficiency, and can also reduce a classic communication. Background technique [0002] Continuous-variable Quantum Key Distribution (CV-QKD) can enable both legal communication parties to obtain unconditionally secure keys, even in the case of eavesdroppers in the quantum channel. CV-QKD technology has attracted the attention of many researchers since it was proposed, and its technology is becoming more and more mature. [0003] Post-processing is a very critical part of CV-QKD technology, and its main function is to extract unc...

Claims

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Application Information

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IPC IPC(8): H04L9/16H04L9/30H04L9/32H04L9/08
CPCH04L9/0819H04L9/0852H04L9/16H04L9/304H04L9/3236
Inventor 张一辰王翔宇喻松郭弘
Owner BEIJING UNIV OF POSTS & TELECOMM
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