Feasible schemes for quantum swap gates of optical qubits via cavity QED

doi:10.1088/1674-1056/20/4/040308

Abstract Feasible schemes for implementing quantum swap gates of both coherent-state qubits and photonic qubits are proposed using a $\Lambda$-type atomic ensemble trapped in a bimodal optical cavity. In both protocols, the decoherence from atomic spontaneous emission is negligible due to the fact that the excited states of the atoms are adiabatically eliminated under large detuning condition and the swap gates can be created in a single step. In our schemes, the required atoms-cavity interaction time decreases with the increase of the number of atoms, which is very important in view of decoherence. The experimental feasibilities of the schemes are also discussed.

Keywords: swap gate coherent-state qubits photonic qubits fidelity

Received: 07 July 2010
Revised: 05 December 2010
Accepted manuscript online:

PACS:	03.67.Lx	(Quantum computation architectures and implementations)
	42.50.-p	(Quantum optics)
	42.50.Pq	(Cavity quantum electrodynamics; micromasers)

Fund: Project supported by the National Natural Science Foundation of China (Grant No. 11004050), the Key Scientific Research Fund of Hunan Provincial Education Department, China (Grant No. 09A013), the Scientific Research Fund of Hunan Provincial Education Department of China (Grant No. 10B013), the Science and Technology Research Foundation of Hunan Province of China (Grant No. 2010FJ4120) and the Science Foundation of Hengyang Normal University, China (Grant No. 09A28).

Cite this article:

Tang Shi-Qing(唐世清), Zhang Deng-Yu(张登玉), Wang Xin-Wen(汪新文), Xie Li-Jun(谢利军), and Gao Feng(高峰) Feasible schemes for quantum swap gates of optical qubits via cavity QED 2011 Chin. Phys. B 20 040308

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Feasible schemes for quantum swap gates of optical qubits via cavity QED

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