基于Turbo码的量子高斯密钥分发的数据协调

郭大波; 张宁; 刘纲

doi:doi:10.3788/asqo20131901.0032

量子光学学报, 2013, 19 (1): 32, 网络出版: 2013-03-27

基于Turbo码的量子高斯密钥分发的数据协调

Reconciliation of Quantum Gaussian Distributed Key based on Turbo Codes

论文大纲

郭大波 ^*张宁刘纲

作者单位

山西大学物理电子工程学院, 山西太原 030006

Turbo码信源编码连续变量量子密钥分发数据协调 turbo code source encoding Continuous-Variable Quantum-Key-Distribution reconciliation

摘要

为了使加密系统中两个合法用户Alice和Bob从量子信道传送的相关的高斯连续变量X和Y中获取出密钥,通过一个理想公共授权信道传送部分信息进而从不一致的X和Y中得到一致的二进制密钥,这一过程称为协调。本文在样条纠错(Sliced Error Correction,SEC) 和多级编码/多路译码(Multi Level coding/Multi Stage Decoding,MLC/MSD)方案的基础上,构建了一套以Turbo纠错码为基础的连续变量量子密钥分发系统的反向数据协调方案。提出了以Turbo码的校验比特流为协调信息的Slepian-Wolf编译码方案。仿真结果表明可在信道信噪比7 dB以上实现20000个连续变量序列的协调。

Abstract

Two legitimate users of an encryption system, Alice and Bob, want to acquire the key from the related Gaussian continuous variables X and Y transferred through a quantum channel, by exchanging parts of information through an ideal public authorized channel, and they get consistent binary keys from the inconsistent X and Y. This process is referred to reconciliation. This paper builds a reconciliation scheme for continuous-variables quantum key distribution using Turbo codes as the primitive code, on the basis of Sliced Error Correction (SEC) and Multi Level coding/Multi Stage Decoding (MLC/MSD). Parity bits of Turbo code are employed as the redundant information in the Slepian-Wolf encoding and decoding scheme. The simulation results show that the reconciliation convergences when the SNR is 7dB above whilst the block size is 20000.

参考文献

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郭大波, 张宁, 刘纲. 基于Turbo码的量子高斯密钥分发的数据协调[J]. 量子光学学报, 2013, 19(1): 32. GUO Da-bo, ZHANG Ning, LIU Gang. Reconciliation of Quantum Gaussian Distributed Key based on Turbo Codes[J]. Acta Sinica Quantum Optica, 2013, 19(1): 32.

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