Realization of Toffoli gate operation using four-level atoms in cavity QED system |
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Authors: | Tang Shi-Qing Zhang Deng-Yu Xie Li-Jun Zhan Xiao-Gui and Gao Feng |
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Institution: | Faculty of Material and Photoelectronic Physics, Xiangtan University, Xiangtan 411005, China;Department of Physics and Electronic Information Science, Hengyang Normal University, Hengyang 421008, China |
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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. |
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Keywords: | Toffoli gate four-level atom cavity QED fidelity |
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