Simple schemes for generation of W-type multipartite entangled states and realization of quantum- information concentration |
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Authors: | Zhang Deng-Yu Tang Shi-Qing Xie Li-Jun Zhan Xiao-Gui Chen Yin-Hua and Gao Feng |
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Institution: | Department of Physics and Electronic Information Science, and Research Institute of Photoelectricity, Hengyang Normal University, Hengyang 421008, China;Department of Physics and Electronic Information Science, and Research Institute of Photoelectricity, Hengyang Normal University, Hengyang 421008, China;Department of Physics and Electronic Information Science, and Research Institute of Photoelectricity, Hengyang Normal University, Hengyang 421008, China;Department of Physics and Electronic Information Science, and Research Institute of Photoelectricity, Hengyang Normal University, Hengyang 421008, China;Department of Physics and Electronic Information Science, and Research Institute of Photoelectricity, Hengyang Normal University, Hengyang 421008, China;Department of Physics and Electronic Information Science, and Research Institute of Photoelectricity, Hengyang Normal University, Hengyang 421008, China |
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Abstract: | We propose simple schemes for generating W-type multipartite entangled states in cavity quantum electrodynamics (CQED). Our schemes involve a largely detuned interaction of Λ-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 only one step. |
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Keywords: | cavity quantum electrodynamics W-state generation quantum-information concentration |
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