Simple schemes for generation of W-type multipartite entangled states and realization of quantum-information concentration  

作　　者：张登玉 唐世清 谢利军 詹孝贵 陈银花 高峰 

机构地区：[1]Department of Physics and Electronic Information Science, and Research Institute of Photoelectricity, Hengyang Normal University

出　　处：《Chinese Physics B》2010年第10期114-119,共6页中国物理B（英文版）

基　　金：Project supported by the Key Scientific Research Fund of the Educational Department of Hunan Province of China (Grant No. 09A013);Science Foundation of Hengyang Normal University of China (Grant No. 09A28)

摘　　要：We propose simple schemes for generating W-type multipartite entangled states in cavity quantum electrodynamics （CQED）. Our schemes involve a largely detuned interaction of A-type three-level atoms with a single-mode cavity field and a classical laser, and both the symmetric and asymmetric W states can be created in a single step. Our schemes are insensitive to both the cavity decay and atomic spontaneous emission. With the above system, we also propose a scheme for realizing quantum-information concentration which is the reverse process of quantum cloning. In this scheme, quantum-information originally coming from a single qubit, but now distributed into many qubits, is concentrated back to a single qubit in onlv one steP.We propose simple schemes for generating W-type multipartite entangled states in cavity quantum electrodynamics （CQED）. Our schemes involve a largely detuned interaction of A-type three-level atoms with a single-mode cavity field and a classical laser, and both the symmetric and asymmetric W states can be created in a single step. Our schemes are insensitive to both the cavity decay and atomic spontaneous emission. With the above system, we also propose a scheme for realizing quantum-information concentration which is the reverse process of quantum cloning. In this scheme, quantum-information originally coming from a single qubit, but now distributed into many qubits, is concentrated back to a single qubit in onlv one steP.

关 键 词：cavity quantum electrodynamics W-state generation quantum-information concentration 

分 类 号：O431.2[机械工程—光学工程]