Free-Space Lossless State Detection of a Single Trapped Atom
Résumé
We demonstrate the lossless state-selective detection of a single rubidium 87 atom trapped in an optical
tweezer. This detection is analogous to the one used on trapped ions. After preparation in either a dark or a
bright state, we probe the atom internal state by sending laser light that couples an excited state to the
bright state only. The laser-induced fluorescence is collected by a high numerical aperture lens.
The single-shot fidelity of the detection is 98.6 +/- 0.2% and is presently limited by the dark count noise
of the detector. The simplicity of this method opens new perspectives in view of applications to quantum
manipulations of neutral atoms.
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PRL106p133003a2011.pdf (200.39 Ko)
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1012.4387.pdf (197.17 Ko)
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