时间和相位混合编码的量子密钥分发方案  

Quantum key distribution based on time coding and phase coding

作　　者：张静[1] 王发强[1] 赵峰[1] 路轶群[1] 刘颂豪[1] 

机构地区：[1]华南师范大学信息光电子科技学院,光子信息技术实验室,广州510006

出　　处：《物理学报》2008年第8期4941-4946,共6页Acta Physica Sinica

基　　金：国家重点基础研究发展规划(批准号:2007CB307001)资助的课题~~

摘　　要：提出了一种在双马赫-曾德尔干涉仪量子保密通信系统上同时实现时间编码和相位编码的混合量子密钥分发方案.提出的方案将原来相位编码方案中丢弃的脉冲进行时间编码,因此成码率是原方案的二倍.系统同时获得时间编码密钥和相位编码密钥,既可以一组用于通信,另一组用于监视窃听,又可以将两组密钥组合成新密钥.系统具有良好的应用前景.A new quantum key distribution scheme is proposed to realize both phase coding and time coding based on two unbalanced Mach-Zehnder interferometers.The pulses which are discarded in the phase coding scheme can be coded in time coding,so the useful bit rate in the present scheme can be doubled.At the same time,the phase coding keys and the time coding keys are obtained.We can use one group of keys to communicate and the other one to guard against eavesdropping,or combine both of them to form new keys.This scheme has favorable application prospect.

关 键 词：量子保密通信 量子密钥分发 相位编码 时间编码 

分 类 号：TN918[电子电信—通信与信息系统]