Generation of multi-atom W states via Raman transitionin an optical cavity

doi:10.1088/1674-1056/19/1/010313

Abstract A simple scheme is proposed to generate the W state of N $\Lambda$-type neutral atoms trapped in an optical cavity via Raman transition. Conditional on no photon leakage from the cavity, the N-qubit W state can be prepared perfectly by turning on a classical coupling field for an appropriate time. Compared with the previous ones, our scheme requires neither individual laser addressing of the atoms, nor demand for controlling N atoms to go through an optical cavity simultaneously with a constant velocity. We investigate the influence of cavity decay using the quantum jump approach and show that the preparation time decreases and the success probability increases with atom number because of a collective enhancement of the coupling.

Keywords: multi-atom W states Raman transition optical cavity

Received: 05 May 2009
Revised: 04 July 2009
Accepted manuscript online:

PACS:	37.10.De	(Atom cooling methods)
	03.65.Ud	(Entanglement and quantum nonlocality)
	42.50.Dv	(Quantum state engineering and measurements)
	42.50.Lc	(Quantum fluctuations, quantum noise, and quantum jumps)
	42.50.Pq	(Cavity quantum electrodynamics; micromasers)

Fund: Project supported by the National Natural Science Foundation of China (Grant No. 10504042) and the Key Laboratory of Low Dimensional Quantum Structures and Quantum Control (Hunan Normal University), Ministry of Education of China (Grant No. QSQC0902).

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Wu Chun-Wang(吴春旺), Han Yang(韩阳), Deng Zhi-Jiao(邓志姣), Liang Lin-Mei(梁林梅), and Li Cheng-Zu(李承祖) Generation of multi-atom W states via Raman transitionin an optical cavity 2010 Chin. Phys. B 19 010313

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