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

作　　者：郭大波[1] 张宁[1] 刘纲[1] 

机构地区：[1]山西大学物理电子工程学院,山西太原030006

出　　处：《量子光学学报》2013年第1期32-38,共7页Journal of Quantum Optics

基　　金：量子光学与光量子器件国家重点实验室开放课题(KF201003);山西省高校高新产业化项目(2010002)

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7dB以上实现20000个连续变量序列的协调。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.

关 键 词：TURBO码 信源编码 连续变量 量子密钥分发 数据协调 

分 类 号：O431[机械工程—光学工程]