Trapping and observing single atoms in the dark

Abstract

A single atom strongly coupled to a cavity mode is stored by three-dimensional confinement in blue-detuned cavity modes of different longitudinal and transverse order. The vanishing light intensity at the trap center reduces the light shift of all atomic energy levels. This is exploited to detect a single atom by means of a dispersive measurement with 95% confidence in 0.010 ms, limited by the photon-detection efficiency. As the atom switches resonant cavity transmission into cavity reflection, the atom can be detected while scattering about one photon.

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• State-insensitive bichromatic optical trapping
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• Measuring the internal state of a single atom without energy exchange
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• A Proposed Experimental Test of Quantum Theory using the Techniques of Atom Optics