| FUNDAMENTAL AREAS OF PHENOMENOLOGY(INCLUDING APPLICATIONS) |
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Sensitive Detection of Individual Neutral Atoms in a Strong Coupling Cavity QED System |
| ZHANG Peng-Fei1, ZHANG Yu-Chi1, LI Gang1, DU Jin-Jin1, ZHANG Yan-Feng1, GUO Yan-Qiang1, WANG Jun-Min1, ZHANG Tian-Cai1**, LI Wei-Dong2
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1State Key Laboratory of Quantum Optics and Quantum Optics Devices, Institute of Opto-Electronics, Shanxi University, Taiyuan 030006
2Department of Physics and Institute of Theoretical Physics, Shanxi University, Taiyuan 030006
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| Cite this article: |
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ZHANG Peng-Fei, ZHANG Yu-Chi, LI Gang et al 2011 Chin. Phys. Lett. 28 044203 |
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Abstract We experimentally demonstrate real-time detection of individual cesium atoms by using a high-finesse optical micro-cavity in a strong coupling regime. A cloud of cesium atoms is trapped in a magneto-optical trap positioned at 5 mm above the micro-cavity center. The atoms fall down freely in gravitation after shutting off the magneto-optical trap and pass through the cavity. The cavity transmission is strongly affected by the atoms in the cavity, which enables the micro-cavity to sense the atoms individually. We detect the single atom transits either in the resonance or various detunings. The single atom vacuum-Rabi splitting is directly measured to be Ω=2π×23.9 MHz. The average duration of atom-cavity coupling of about 110 µs is obtained according to the probability distribution of the atom transits.
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| Keywords:
42.50.Pq
37.10.Gh
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Received: 06 January 2011
Published: 29 March 2011
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| PACS: |
42.50.Pq
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(Cavity quantum electrodynamics; micromasers)
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37.10.Gh
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(Atom traps and guides)
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