多用户网络环境下量子密码术

在传统的点到点之间进行量子密钥分发协议的基础上,利用量子存储技术和EPR粒子纠缠态互换的方法,提出了在多用户、多控制中心、远距离的网络环境下进行量子密钥传送的方案。与传统的点与点之间的量子密钥传送协议类似,其安全性也是建立在量子力学原理上,任何窃听者的存在必将使生成密钥的误码率上升而被合法通信用户发现。

Quantum cryptography under multi-user network environment

Unlike classical bits, quantum bits cannot be duplicated and the quantum-entangled states cannot be identified. This property of quantum information was used to suggest an information-theoretic secure cryptography-quantum cryptography. This paper concentrates on quantum key distribution over a long-distance quantum network, it has many nodes and control centers which are connected by quantum channels. Quantum bits are storage on the quantum control centers and using entanglement states swapping to transfer over large distances between nodes and centers. An eavesdropper will inevitably increase the quantum bit error rate and the legitimate users will detect the eavesdropper and hence not use the key.