Large-scale continuous variable quantum key distribution data coordination method based on GPU

Abstract

The invention provides a large-scale continuous variable quantum key distribution data coordination method based on a GPU, belongs to the field of key distribution and aims at solving the technical problem that the decoding speed is slow and the efficiency is low due to the fact that an existing data coordination method is realized on a CPU. The method comprises the steps that the CPU stores an LDPC sparse check matrix H in a mode of a static bidirectional circular cross linked list and then sends the H to the GPU; the CPU controls an Alice to send continuous variable quanta X to a Bob; the Bob detects a sequence Y and then quantifies the Y to obtain Y', classifies the Y' to obtain first to fourth level code stream sequences, codes the third and fourth level code stream sequences to obtain coded third and fourth level code stream sequences; the Bob multiplies the H by the coded third and fourth level code stream sequences to obtain syndromes corresponding to the third and fourth code stream sequences and sends the syndromes and the first and second level code stream sequences back to the Alice through an ideal classic channel; and the GPU allocates a plurality of threads for parallel multilevel decoding according to the syndromes corresponding to the third and fourth level code stream sequences on the Alice and side information X stored by the Alice.

Description

technical field [0001] The invention relates to the technical field of continuous variable quantum key distribution, in particular to a GPU-based data coordination method for large-scale continuous variable quantum key distribution. Background technique [0002] With the rapid development of computer information technology, information security also occupies a very important position. Quantum key distribution (QKD) has physical unconditional security, so quantum secure communication has gained widespread attention. Among them, continuous variable quantum key distribution (CV-QKD) is an important branch in the field of quantum secure communication, and has become a research hotspot of many scholars. The technical framework of CV-QKD is that Alice transmits the continuous Gaussian variable X to Bob’s receiving end through the quantum channel through the coherent state modulation of photons at the sending end, and Bob’s receiving end receives the sequence Y after detection by ...

AI Technical Summary

Problems solved by technology

[0005] In order to solve the technical problems that the current large-scale continuous variable quantum key distribution data coordination method is implemented on the CPU, resulting in slow decoding speed and low data coordination efficiency, the present invention provides a GPU-based large-scale continuous variable quantum key encryption method. Data Coordination Method for Key Distribution

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