Hierarchical data coordination method based on polarization codes in continuous variable quantum key distribution system

Abstract

The invention relates to a hierarchical data coordination method based on polarization codes in a continuous variable quantum key distribution system. The specific steps of the method are as follows:S1, legitimate communication parties hold cross-correlated continuous variables, and hierarchically quantify the data of a sender (a receiver under reverse coordination) to obtain multi-level binary data; S2, a few levels containing less information in the multi-level binary data obtained in S1 are disclosed, polarization code inverse encoding is carried out on the undisclosed data, and the locations of sleep bits and corresponding data are disclosed; and S3, the receiver (the sender under reverse coordination) uses the disclosed binary data and sleep bit information to carry out polarizationcode decoding among multiple levels on the continuous variables held. The method has low encoding and decoding complexity and good error correction performance. By using the method, high coordinationefficiency can be achieved, and the security code rate of the continuous variable quantum key distribution system can be improved.

Description

technical field [0001] The invention relates to the key technical field of post-processing of continuous variable quantum key distribution, and mainly relates to a layered data coordination method based on polar codes used in the post-processing of continuous variable quantum key distribution system. This method is especially suitable for data coordination under the condition of high signal-to-noise ratio, and can obtain high coordination efficiency, thereby improving the security code rate of the system. Background technique [0002] Information security is an important means to protect personal and property safety. With the development of high-performance computers, especially the possible realization of quantum supremacy in the near future, traditional classical ciphers based on mathematical computational complexity have been greatly challenged. Quantum cryptography is based on physical principles and has unconditional security. Continuous-Variable Quantum Key Distribut...

AI Technical Summary

Problems solved by technology

With the development of high-performance computers, especially the possible realization of quantum supremacy in the near future, traditional classical ciphers based on mathematical computational complexity have been greatly challenged

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