Hannover 2010 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 3: Ultra-Cold Atoms: Trapping and Cooling (with Q)

A 3.1: Vortrag

Montag, 8. März 2010, 14:00–14:15, A 320

Shortcut to adiabaticity: fast optimal frictionless atom cooling in harmonic traps — •Andreas Ruschhaupt — Institut für Theoretische Physik, Leibniz Universität Hannover, Appelstraße 2, 30167 Hannover, Germany

A method is proposed to cool down atoms in a harmonic trap as in a perfectly slow adiabatic expansion but in a much shorter time. This is achieved by designing the time dependence of the trap frequency, the harmonic trap may even become an expulsive parabolic potential in some time interval. The resulting cooling times have no fundamental lower bound and are shorter than previous minimal times using optimal-control bang-bang methods and real frequencies.

Ref.: [1] Xi Chen, A. Ruschhaupt, S. Schmidt, A. del Campo, D. Guery-Odelin and J. G. Muga, arXiv:0910.0709v1 [quant-ph]

[2] J. G. Muga, Xi Chen, A. Ruschhaupt and D. Guery-Odelin, J. Phys. B: At. Mol. Opt. Phys. 42 (2009) 241001 (FTC)