摘要
Our concern is to design an assisted-clone scheme which can produce a perfect copy of a three-particle Oreenberger-Horne-Zeilinger （GHZ） class state with a high probability. In the first stage of the protocol, the sender teleports the input state to the receiver by using three EPR pairs as the quantum channel. In the second stage of the protocol, a novel set of mutually orthogonal basis vectors is constructed. With the assistance of the preparer through a three-particle projective measurement under this basis, the perfect copy of an original state can be reestablished by the sender with the probability 1/2. Moreover, the classical communication cost of the scheme is also calculated.
基金
Supported by the National Basic Research Program of China(973 Program)under Grant No.2007CB311203
the National Natural Science Foundation of China under Grant Nos.61003287 and 60821001
the Specialized Research Fund for the Doctoral Program of Higher Education(20100005120002)
the Fundamental Research Funds for the Central Universities(No.BUPT2009RC0220)
the 111 Project(No.B08004)
