中国物理B ›› 2009, Vol. 18 ›› Issue (1): 56-61.doi: 10.1088/1674-1056/18/1/010

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Realization of Toffoli gate operation using four-level atoms in cavity QED system

张登玉1, 詹孝贵1, 高峰1, 唐世清2, 谢利军2   

  1. (1)Department of Physics and Electronic Information Science, Hengyang Normal University, Hengyang 421008, China; (2)Faculty of Material and Photoelectronic Physics, Xiangtan University, Xiangtan 411005, China;Department of Physics and Electronic Information Science, Hengyang Normal University, Hengyang 421008, China
  • 收稿日期:2008-04-22 修回日期:2008-06-15 出版日期:2009-01-20 发布日期:2009-01-20
  • 基金资助:
    Project supported by the Natural Science Foundation of Hunan Province, China (Grant No 06JJ50118).

Realization of Toffoli gate operation using four-level atoms in cavity QED system

Tang Shi-Qing(唐世清)a)b)† , Zhang Deng-Yu(张登玉)b), Xie Li-Jun(谢利军)a)b), Zhan Xiao-Gui(詹孝贵)b), and Gao Feng(高峰)b)   

  1. a Faculty of Material and Photoelectronic Physics, Xiangtan University, Xiangtan 411005, China; b Department of Physics and Electronic Information Science, Hengyang Normal University, Hengyang 421008, China
  • Received:2008-04-22 Revised:2008-06-15 Online:2009-01-20 Published:2009-01-20
  • Supported by:
    Project supported by the Natural Science Foundation of Hunan Province, China (Grant No 06JJ50118).

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摘要： This paper proposes a scheme for realization of a three-qubit Toffoli gate operation using three four-level atoms by a selective atom--field interaction in a cavity quantum electrodynamics system. In the proposed protocol, the quantum information is encoded on the stable ground states of atoms, and atomic spontaneous emission is negligible as the large atom--cavity detuning effectively suppresses the spontaneous decay of the atoms. The influence of the dissipation on fidelity and success probability of the three-qubit Toffoli gate is also discussed. The scheme can also be applied to realize an N-qubit Toffoli gate and the interaction time required does not rise with increasing the number of qubits.

关键词: Toffoli gate, four-level atom, cavity QED, fidelity

Abstract: This paper proposes a scheme for realization of a three-qubit Toffoli gate operation using three four-level atoms by a selective atom--field interaction in a cavity quantum electrodynamics system. In the proposed protocol, the quantum information is encoded on the stable ground states of atoms, and atomic spontaneous emission is negligible as the large atom--cavity detuning effectively suppresses the spontaneous decay of the atoms. The influence of the dissipation on fidelity and success probability of the three-qubit Toffoli gate is also discussed. The scheme can also be applied to realize an N-qubit Toffoli gate and the interaction time required does not rise with increasing the number of qubits.

Key words: Toffoli gate, four-level atom, cavity QED, fidelity

中图分类号:  (Quantum computation architectures and implementations)

  • 03.67.Lx
32.80.-t (Photoionization and excitation) 42.50.Pq (Cavity quantum electrodynamics; micromasers)