基于4粒子团簇态实现量子态的双向通信

To Realize Two-Way Communication of Quantum State Via Four-Qubit Cluster State

提出了一个用4粒子团簇态作为量子信道传输量子态信息以实现双向通信的方案.在该方案中,通信双方Alice和Bob事先共享一个4粒子团簇态.在通信过程中:首先,将4粒子团簇态与双方要传递的量子态信息共同构成系综态;然后,Alice和Bob分别对自己拥有的部分粒子作Bell基的联合测量,并把测量结果通过经典信道告诉对方;最后,Alice和Bob根据对方公布的测量结果,作相应的幺正变换,就可以在自己的粒子上重现对方要传送的量子态信息.这样就达到了实现量子态的双向通信的目的.

A scheme of using four-qubit cluster state as quantum channel（QC） to convey the quantum state informa- tion is proposed to realize two-way communication. In this scenario, two sides of communication, Alice and Bob, share a four-qubit cluster state. In the process of communication, at first, four-qubit cluster state form a whole system with quantum state information two sides have. Then, Alice and Bob perform Bell-state joint measurements to their own part qubits respectively ,and tell the measured results to each other via classical channel（CC）. Finally, accord- ing to the measured results,Alice and Bob make corresponding unitary transformations, hence its own party can re- appear the opposite quantum state information. So two-way communication of quantum state information is achieced.