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

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

中国物理B ›› 2011, Vol. 20 ›› Issue (4): 40308-040308.doi: 10.1088/1674-1056/20/4/040308

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

唐世清, 张登玉, 汪新文, 谢利军, 高峰

Department of Physics and Electronic Information Science, and Research Institute of Photoelectricity, Hengyang Normal University, Hengyang 421008, China

收稿日期:2010-07-07 修回日期:2010-12-05 出版日期:2011-04-15 发布日期:2011-04-15
基金资助:
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).

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

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)

Department of Physics and Electronic Information Science, and Research Institute of Photoelectricity, Hengyang Normal University, Hengyang 421008, China

Received:2010-07-07 Revised:2010-12-05 Online:2011-04-15 Published:2011-04-15
Supported by:
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).

摘要/Abstract

摘要： Feasible schemes for implementing quantum swap gates of both coherent-state qubits and photonic qubits are proposed using a Λ-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.

关键词: swap gate, coherent-state qubits, photonic qubits, fidelity

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.

Key words: swap gate, coherent-state qubits, photonic qubits, fidelity

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

03.67.Lx

42.50.-p (Quantum optics) 42.50.Pq (Cavity quantum electrodynamics; micromasers)

唐世清, 张登玉, 汪新文, 谢利军, 高峰. Feasible schemes for quantum swap gates of optical qubits via cavity QED[J]. 中国物理B, 2011, 20(4): 40308-040308.

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[J]. Chin. Phys. B, 2011, 20(4): 40308-040308.

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

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

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