中国物理B ›› 2010, Vol. 19 ›› Issue (10): 100313-100313.doi: 10.1088/1674-1056/19/10/100313

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

张登玉, 唐世清, 谢利军, 詹孝贵, 陈银花, 高峰   

  1. Department of Physics and Electronic Information Science, and Research Institute of Photoelectricity, Hengyang Normal University, Hengyang 421008, China
  • 收稿日期:2010-02-01 修回日期:2010-03-17 出版日期:2010-10-15 发布日期:2010-10-15
  • 基金资助:
    Project supported by the Key Scientific Research Fund of the Educational Department of Hunan Province of China (Grant No. 09A013) and Science Foundation of Hengyang Normal University of China (Grant No. 09A28).

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

Zhang Deng-Yu(张登玉)† , Tang Shi-Qing(唐世清)‡, Xie Li-Jun(谢利军), Zhan Xiao-Gui(詹孝贵), Chen Yin-Hua(陈银花), and Gao Feng(高峰)   

  1. Department of Physics and Electronic Information Science, and Research Institute of Photoelectricity, Hengyang Normal University, Hengyang 421008, China
  • Received:2010-02-01 Revised:2010-03-17 Online:2010-10-15 Published:2010-10-15
  • Supported by:
    Project supported by the Key Scientific Research Fund of the Educational Department of Hunan Province of China (Grant No. 09A013) and Science Foundation of Hengyang Normal University of China (Grant No. 09A28).

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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 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.

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 $\Lambda$-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.

Key words: cavity quantum electrodynamics, W-state generation, quantum-information concentration

中图分类号:  (Entanglement and quantum nonlocality)

  • 03.65.Ud
03.67.Lx (Quantum computation architectures and implementations) 03.67.Mn (Entanglement measures, witnesses, and other characterizations) 32.50.+d (Fluorescence, phosphorescence (including quenching)) 42.50.Pq (Cavity quantum electrodynamics; micromasers)