基于BB84协议利用多对量子态实现量子密钥分配  

Quantum Key Distribution with Multiple Pairs of States Based on BB84

作　　者：江月松[1] 兰天星 陈瑞强[1] 孙庆科 何云涛[1] 

机构地区：[1]北京航空航天大学电子信息工程学院,北京100191

出　　处：《量子光学学报》2014年第4期289-295,共7页Journal of Quantum Optics

基　　金：北京航空航天大学基本科研业务费(YWF-13-D2-XX-2)

摘　　要：为了改善BB84协议防窃听的能力,在BB84协议的基础上提出用M(M=3,4,5…)对量子态实现量子密钥分配。为了检测其安全性,用截获-重发的方式对量子密钥分配过程进行窃听,窃听者分别采用两种检测光子状态的方法:在M组基中随机选取一种基和用Breidbart基测量,并在这两种窃听方法下分别通过计算机仿真探究M值与安全性能的关系。仿真结果表明:用多对量子态实现量子密钥分配时,发现窃听者的能力与BB84协议相同,而窃听者可以获取的正确信息要比窃听BB84协议获取的正确信息少。从而提高了量子密钥分配的安全性。To improve BB84 ＇s ability against eavesdropping, quantum key distribution（QKD） with M（M= 3,4,5…） pairs of quantum states was proposed here. To test its security, the quantum key distribution process was eavesdropped by intercepting and retransmitting photons. The eavesdropper took two methods to measure every photon＇s state： to measure with a randomly selected base from M bases, and to measure with Breidbart base. Under each eavesdropping methods, the relationship between M and safety was explored. The simulation result indicated： quantum key distribution with multiple pairs of states had the same perfomance with BB84 in detecting the eavesdropper, but it had better perfomance than BB84 in letting the eavesdropper get less information.

关 键 词：量子密码 量子密钥分配 多对量子态 BB84协议 

分 类 号：TN918[电子电信—通信与信息系统]