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Bulletin of the American Physical Society

Hyperfine-State Coherence in the Presence of Spontaneous Photon Scattering

Roee Ozeri, C. Langer, John D. Jost, Brian DeMarco, Amit Ben-Kish, R. B. Blakestad, J. Britton, John Chiaverini, David B. Hume, Wayne M. Itano, Dietrich G. Leibfried, R. Reichle, Till Rosenband, Piet O. Schmidt, D. J. Wineland

Published May 18, 2005• 0 citations
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We perform spectroscopy on the hyperfine splitting of 85^{85}85Rb atoms trapped in far-off-resonance optical traps. The existence of a spatially dependent shift in the energy levels is shown to induce an inherent dephasing effect, which causes a broadening of the spectroscopic line and hence an inhomogeneous loss of atomic coherence at a much faster rate than the homogeneous one caused by spontaneous photon scattering. We present here a number of approaches for reducing this inhomogeneous broadening, based on trap geometry, additional laser fields, and novel microwave pulse sequences. We then show how hyperfine spectroscopy can be used to study quantum dynamics of optically trapped atoms.