摘要
Using a quantum channel consisting of a GHZ state exposed to noisy environment,we investigate how toremotely prepare an entangled state and a qubit state,respectively.By solving the master equation in the Lindbladform,the influence of the various types of noises on the GHZ state is first discussed.Then we use the fidelity to describehow close the remotely prepared state and the initial state are.Our results show that the fidelity is a function of thedecoherence rates and the angles of the initial state.It is found that for each of the two RSP schemes,the influence ofthe noise acting simultaneously in x,y,and z directions on the average fidelity is the strongest while the influence of thenoise acting in x or z direction on the average fidelity is relatively weaker.
基金
National Natural Science Foundation of China under Grant Nos.60708003,60578050,and 10434060
the State Key Basic Research Program of China under Grant No.2006CB921604
the Shanghai Science and Technology Committee under Grant No.07JC14017
the Director Fund of State Key Laboratory of Precision Spectroscopy
