Berlin 2005 – wissenschaftliches Programm
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Q: Quantenoptik und Photonik
Q 65: Fallen & Kühlung II
Q 65.5: Vortrag
Mittwoch, 9. März 2005, 12:00–12:15, HU 1070
Extracting Atoms on Demand with Lasers — •Bernd Mohring1, Marc Bienert1,2, Florian Haug1, Giovanna Morigi1,3, Mark G. Raizen4, and Wolfgang P. Schleich1 — 1Abteilung für Quantenphysik, Universität Ulm, 89069 Ulm — 2Centro de Ciencias Físicas, UNAM, Campus Morelos, MEX 62251 Cuernavaca, Morelos, Mexico — 3Departament de Física, Universitat Autònoma de Barcelona, 08193 Bellaterra, Spain — 4Department of Physics, The University of Texas, Austin, Texas 78712-1081, USA
We propose a scheme that allows us to coherently extract cold atoms from a reservoir in a deterministic way. The transfer is achieved by means of radiation pulses coupling two atomic states which are object to different trapping conditions. A particular realization is proposed, where one state has zero magnetic moment and is confined by a dipole trap, whereas the other state with non-vanishing magnetic momentum is coupled to a steep microtrap potential. We show that a predetermined number of atoms can be transferred from a reservoir, a Bose-Einstein condensate, into the collective quantum state of a steep trap with efficiencies reaching 100% and times of the order of the millisecond in the parameter regime of present experiments.