基于纯纠缠态的量子安全直接通信协议

Quantum Secure Direct Communication Protocol with Pure Entangled States

基于纯纠缠态,提出一种量子安全直接通信协议。通信方利用decoy光子来检测窃听。在保证量子信道的安全后,发送方通过控制非操作和von Neumann测量将秘密消息编码在纯纠缠态上并发送给接收方。由于所有的纯纠缠态都用于传输秘密消息,该协议具有较高的量子比特效率。就实验的可行性来说,该协议可以用当前的技术实现。此外,该协议在噪声量子信道中也是安全的。

We present a quantum secure direct communication protocol where the channels are not the maximally entangled states. The communication parties utilize decoy photons to check eavesdropping. After ensuring the security of the quantum channel, the sender encodes the secret message and transmits it to the receiver by using controlled-NOT operation and yon Neumann measurement. The protocol is efficient in that all pure entangled states are used to transmit the secret message. As for the experimental feasibility, our protocol can be realized with today＇s technologies.The protocol is also verified to be secure for a noise quantum channel.