This paper proposes a simple scheme for generating a three-atom GHZ state via cavity quantum electrodynamics （QED）. The task can be achieved through the interaction between two EPR states, which can be prepared easi...This paper proposes a simple scheme for generating a three-atom GHZ state via cavity quantum electrodynamics （QED）. The task can be achieved through the interaction between two EPR states, which can be prepared easily with current technology. In this scheme, the cavity field is only virtually excited during the interaction process, and no quantum information transfer between the atoms and the cavity is required. Thus it greatly prolongs the efficient decoherent time. Moreover, this scheme is also applicable for generating an N-atom GHZ state.展开更多
<正> We propose a scheme for teleportation of four-level atomic states in thermal cavities.The scheme does notinvolve the generalized Bell-state or generalized GHZ-state measurement,which is difficult in practic...<正> We propose a scheme for teleportation of four-level atomic states in thermal cavities.The scheme does notinvolve the generalized Bell-state or generalized GHZ-state measurement,which is difficult in practice.Another featureof the scheme is that it does not require individual addressing of atoms in cavity and is insensitive to both cavity decayand thermal field,which is of importance in point of experiment.展开更多
基金Project supported by the National Natural Science Foundation of China （Grant No 10574001） and the Program of the Education Department of Anhui Province （Grant No 2004kj029）.
文摘This paper proposes a simple scheme for generating a three-atom GHZ state via cavity quantum electrodynamics （QED）. The task can be achieved through the interaction between two EPR states, which can be prepared easily with current technology. In this scheme, the cavity field is only virtually excited during the interaction process, and no quantum information transfer between the atoms and the cavity is required. Thus it greatly prolongs the efficient decoherent time. Moreover, this scheme is also applicable for generating an N-atom GHZ state.
基金Project supported by the Natural Science Foundation of Henan Province, China （Grant No 0511010600） and the Education Department of Henan Province, China （Grant No 2006140005）.
基金The project supported by the Scientific Research Fund of Education Department of Hunan Province of China under Grant No. 06C354, the Natural Science Foundation of Hunan Province of China under Grant No. 06JJ50015
文摘<正> We propose a scheme for teleportation of four-level atomic states in thermal cavities.The scheme does notinvolve the generalized Bell-state or generalized GHZ-state measurement,which is difficult in practice.Another featureof the scheme is that it does not require individual addressing of atoms in cavity and is insensitive to both cavity decayand thermal field,which is of importance in point of experiment.
