aFaculty of Material and Photoelectronic Physics, Xiangtan University, Xiangtan 411005, China; b Department of Physics and Electronic Information Science, Hengyang Normal University, Hengyang 421008, China
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.
Received: 22 April 2008
Revised: 15 June 2008
Accepted manuscript online:
PACS:
03.67.Lx
(Quantum computation architectures and implementations)
Fund: Project supported by the Natural
Science Foundation of Hunan
Province, China (Grant No 06JJ50118).
Cite this article:
Tang Shi-Qing(唐世清), Zhang Deng-Yu(张登玉), Xie Li-Jun(谢利军), Zhan Xiao-Gui(詹孝贵), and Gao Feng(高峰) Realization of Toffoli gate operation using four-level atoms in cavity QED system 2009 Chin. Phys. B 18 56
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