基于量子远程通信的连续变量量子确定性密钥分配协议

摘要

By exploiting quantum teleportation,we propose a continuous-variable quantum deterministic key distribution（CVQDKD） protocol using two-mode squeezed vacuum state and coherent state.The efficiency is 100%under the homodyne detection.The security of CVQDKD is analyzed in detail from information theory,and the result shows that the proposed protocol can securely hand over the pre-deterministic key.By contrast with the quantum random key distribution,the quantum deterministic key distribution plays an irreplaceable role in the field of key management.Furthermore,the CVQDKD can obtain a higher rate and better efficiency than the quantum deterministic key distribution protocols with discrete variables,and the quantum states used in the protocol are also easy to produce and manipulate,which i suitable for long-distance transmission.Therefore,the CVQDKD protocol is more practical.%基于量子远程通信的原理,本文借助双模压缩真空态和相干态,提出一种连续变量量子确定性密钥分配协议.在利用零差探测法的情况下协议的传输效率达到了100%.从信息论的角度分析了协议的安全性,结果表明该协议可以安全传送预先确定的密钥.在密钥管理中,量子确定性密钥分配协议具有量子随机性密钥分配协议不可替代的重要地位和作用.与离散变量量子确定性密钥分配协议相比,该协议分发密钥的速率和效率更高,又协议中用到的连续变量量子态易于产生和操控、适于远距离传输,因此该协议更具有实际意义.