中国物理B ›› 2010, Vol. 19 ›› Issue (1): 10313-010313.doi: 10.1088/1674-1056/19/1/010313

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

吴春旺1, 韩阳1, 梁林梅1, 李承祖1, 邓志姣2   

  1. (1)College of Science, National University of Defense Technology, Changsha 410073, China; (2)College of Science, National University of Defense Technology, Changsha 410073, China;Key Laboratory of Low Dimensional Quantum Structures and Quantum Control (Hunan Normal University), Ministry of Education of China, Changsha 410081, China
  • 收稿日期:2009-05-05 修回日期:2009-07-04 出版日期:2010-01-15 发布日期:2010-01-15
  • 基金资助:
    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).

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

Wu Chun-Wang(吴春旺)a)†, Han Yang(韩阳) a), Deng Zhi-Jiao(邓志姣)a)b), Liang Lin-Mei(梁林梅)a), and Li Cheng-Zu(李承祖)a)   

  1. a College of Science, National University of Defense Technology, Changsha 410073, China; b Key Laboratory of Low Dimensional Quantum Structures and Quantum Control (Hunan Normal University), Ministry of Education of China, Changsha 410081, China
  • Received:2009-05-05 Revised:2009-07-04 Online:2010-01-15 Published:2010-01-15
  • Supported by:
    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).

摘要: 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.

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.

Key words: multi-atom W states, Raman transition, optical cavity

中图分类号:  (Atom cooling methods)

  • 37.10.De
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)