广义GHZ态实现的可控密集编码

Controlled Dense Coding Achieved by Using Generalized GHZ-Type State

提出了一种利用广义GHZ态实现的可控密集编码方案。在该方案中,首先控制者Cliff对他所持的粒子进行Von Neumann测量,然后将结果告知Alice和Bob,Alice在引入辅助粒子和实施幺正操作后接着对辅助粒子进行Von Neumann测量,再将测量结果告诉Bob,Bob通过Bell基测量便可辨别出Alice实施的幺正操作,从而以一定的几率得到Alice传送给他的信息。

This paper pats forward a controlled quantum dense coding by using generalized GHZ-Type state. In this protocol, the controller Cliff performs a von Neumann meas-urement on his particle,then informs his measurement result to Alice and Bob. Alice performs a von Neumann measurement on the auxiliary particle after introducing an auxiliary particle and implementing an unitary operation, and informs Bob of her measurement result. By performing a Bell-basis measurement, Bob can discriminate Alice＇s unitary transformation, so then, he gets the information from Alice with a certain probability.