Measurements of Diffusion Resonances for the Atom Optics Quantum Kicked Rotor
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We present experimental observations of diffusion resonances for the quantum kicked rotor with weak decoherence. Cold caesium atoms are subject to a pulsed standing wave of near-resonant light, with spontaneous emission providing environmental coupling. The mean energy as a function of the pulse period is determined during the late-time diffusion regime for a constant probability of spontaneous emission per unit time. Structure in the late-time energy is seen to increase with physical kicking strength. The observed structure is related to Shepelyansky's predictions of the initial quantum diffusion rates.
11 pages, 3 figures, iopart.cls, revised version
11 pages, 3 figures, iopart.cls, revised version