基于条件参量下转换光子对的非正交编码诱惑态量子密钥分发  

Nonorthogonal decoy-state quantum key distribution based on conditionally prepared down-conversion source

作　　者：胡华鹏[1] 王金东[1] 黄宇娴[1] 刘颂豪[1] 路巍[2] 

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广东省高校重点实验室,广州510006 [2]中国科学院合肥智能研究所,合肥230031

出　　处：《物理学报》2010年第1期287-292,共6页Acta Physica Sinica

基　　金：广州市科技支撑计划(批准号:2008Z1-D501);广东省工业攻关项目(批准号:2007B010400009)资助的课题~~

摘　　要：诱惑态方法和非正交编码协议可以有效的抵制光子数分束攻击,所以近来得到了广泛的关注.这里结合了这两种方法提出了一种新方案,光源采用呈泊松分布的参量下转换光子对,发送方随机的改变抽运光的强度获得不同强度的信号光,信号态用来产生密钥,诱惑态用来监测窃听,并估算单光子和两光子的计数率和量子误码率,模拟了密钥产生率与传输距离的关系曲线,分析了该方案可以进一步提高安全量子密钥分发的性能.The decoy-state method and the non-orthogonal encoding protocol, being capable of resisting the photon-number splitting attack, have become attractive recently. Here, we combine both the methods and propose a new protocol using a conditionally prepared down-conversion source, following Poisson photon number distribution. In the protocol, Alice randomly changes the intensities of the pump light so that the intensity of signal photon of photon pair is randomly changed. The signal state is used for generating keys, the decoy states for detecting the eavesdropping and estimating the fraction of single-photon and two-photon pulses. We have simulated the final key rate over transmission distance, showing our scheme can enhance the performance of quantum key distribution.

关 键 词：量子密钥分发 诱惑态 参量下转换 

分 类 号：O431.2[机械工程—光学工程]