1234量子密钥分配（QKD）的基本原理6VENONAProject:SillyBugsCanKillSeriousCryptosystems891011实例：BB84协议（4）量子密钥分配中的传统信息通道现状及未来欧盟(2008)16实际量子密钥分配系统安全性研究18192021222324252627282930313233Basicidea:AliceandBobcanperformBellinequalitiestestwithoutknowinghowthedeviceactuallyworks.AslongasAliceandBobcanverifytheexistenceofentanglement,itispossibletogeneratesecurekey.假设量子力学是正确的;测量基的选择是完全随机的;信息不能随意从Alice和Bob的系统中泄露出去。局限DI-QKDishighlyimpracticalasitrequiresanearunitydetectionefficiencyandeventhengeneratesanextremelylowkeyrate(oforder10-10bitperpulse)atpracticaldistances[1,2].363738