Dresden 2011 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 20: Ultra-cold atoms, ions and BEC V (with Q)

A 20.4: Vortrag

Donnerstag, 17. März 2011, 11:15–11:30, BAR 106

Quantum-noise quenching in quantum tweezers — •Stefano Zippilli1,2,3, Bernd Mohring4, Eric Lutz5, Giovanna Morigi1,2, and Wolfgang Schleich41Departament de Física, Universitat Autònoma de Barcelona, E-08193 Bellaterra, Spain — 2Theoretische Physik, Universität des Saarlandes, D-66041 Saarbrücken, Germany — 3Fachbereich Physik and research center OPTIMAS, Technische Universität Kaiserslautern, D-67663 Kaiserslautern, Germany — 4Institut für Quantenphysik, Universität Ulm, D-89081 Ulm, Germany — 5Department of Physics, University of Augsburg, D-86135 Augsburg, Germany

The efficiency of extracting single atoms or molecules from an ultracold bosonic reservoir is theoretically investigated for a protocol based on lasers, coupling the hyperfine state in which the atoms form a condensate to another stable state, in which the atom experiences a tight potential in the regime of collisional blockade, the quantum tweezers. The transfer efficiency into the single-atom ground state of the tight trap is fundamentally limited by the collective modes of the condensate, which are thermally and dynamically excited and constitute the ultimate noise sources. This quantum noise can be quenched for sufficiently long laser pulses, thereby achieving high efficiencies, and showing that this protocol can be applied for quantum information processing based on tweezer traps for neutral atoms.

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