1Department of Physics and Electronic Information Science, Hengyang Normal University, Hengyang 4210082Faculty of Material and Photoelectronic Physics, Xiangtan University, Xiangtan 411005
Realization of Three-Qubit Controlled-Phase Gate Operation with Atoms in Cavity QED System
1Department of Physics and Electronic Information Science, Hengyang Normal University, Hengyang 4210082Faculty of Material and Photoelectronic Physics, Xiangtan University, Xiangtan 411005
摘要We propose a scheme for realization of three-qubit controlled-phase gate via passing two three-level atoms through a high-Q optical cavity in a cavity QED system. In the presented protocol, the two stable ground states of the atoms act as the two controlling qubits and the zero- and one-photon Fock states of the cavity-field form the target qubit, and no auxiliary state or any measurement is required. The numerical simulation shows that the gate fidelities remain at a high level under the influence of the atomic spontaneous emission, the decay of the cavity mode and deviation of the coupling strength. The experimental feasibility of our proposal is also discussed.
Abstract：We propose a scheme for realization of three-qubit controlled-phase gate via passing two three-level atoms through a high-Q optical cavity in a cavity QED system. In the presented protocol, the two stable ground states of the atoms act as the two controlling qubits and the zero- and one-photon Fock states of the cavity-field form the target qubit, and no auxiliary state or any measurement is required. The numerical simulation shows that the gate fidelities remain at a high level under the influence of the atomic spontaneous emission, the decay of the cavity mode and deviation of the coupling strength. The experimental feasibility of our proposal is also discussed.
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2009, Vol. 26 
