利用纠缠GHZ态实现受控的量子确定性安全通讯(英文)

Controlled Deterministic Secure Quantum Communication by Using GHZ State

提出一个受控的量子确定性安全通信方案,在通信过程中,纠缠GHZ态用作量子信道,秘密信息的编码和破解是通过受控的量子纠缠交换和局域酉变换实现的。此方案是安全的。关于此方案安全性的证明和两步方案[Phys.Rev.A68 042317]的安全性是一样的。此方案也可以推广到有多方控制者参与的情形。

In this paper, we present a controlled deterministic secure quantum communication protocol. During the communication, GHZ state is used as quantum channel, secret message is encoded and decoded by controlled quan- tum entanglement swapping and local unitary operation. This protocol is completely secure and the proof of the security is the same as that in the two-step protocol [ Phys. Rev. A 68 042317]. This scheme can also be generalized to a multi-party controlled system.