基于双向量子隐形传态上的双向量子安全直接通信

Bidirectional Quantum Secure Direct Communication Based on Bidirectional Quantum Teleportation

提出了一种利用EPR对和纠缠交换的双向量子隐形传态;在这个协议中,双方可同时发送一个未知的单一量子比特给对方,而且在实际操作中比以前的提出的协议更加简单;利用提出的双向量子隐形传态,建立了一种新的双向量子安全直接通信协议,协议在通信过程中不需要传递携带秘密信息的量子比特,大大提高了量子通信的安全信.

In this paper,a bidirectional quantum teleportation protocol based on Einstein-Podolsky – Rosen（ EPR） pairs and entanglement swapping is proposed. In this scheme,two users can simultaneously transmit an unknown single-qubit state to each other,and the scheme is easier in actual operation compared with previous work. By utilizing this bidirectional quantum teleportation protocol, a bidirectional quantum secure direct communication scheme is presented and no qubits carrying secret messages are transmitted in a quantum channel which greatly improves security of quantum communication.