基于W态的量子安全直接通信协议

Quantum Secure Direct Communication Protocol Based on W State

提出了一种新的两方量子安全直接通信协议。该方案利用有序的四粒子W态作为信息载体,利用幺正变换对秘密消息进行编码,通过当地Bell基测量和经典通信直接传递秘密消息。在理想信道下,协议对于非相干攻击是安全的。该方案的优点在于利用W态作为信息载体,较GHZ态而言,损耗要小得多,并且不需要在量子信道中传输载有秘密消息的量子比特。

A novel two-party quantum secure direct communication protocol was proposed. By using ordered four-particle W state as carrier of information, encoding the secret message with unitary transformation, we can directly transmit secret message with local Bell-basis measurement and classical communication. In ideal channel, the protocol is secure against incoherent attack. The advantage of this scheme is that using W state is more little than GHZ state in energy loss and no quantum bit carrying secret message is transmitted in quantum channel.