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Conference on Lasers and Electro-Optics

Delta-kick cooling using the Ioffe-Pritchard potential

Takatoshi Aoki, Toshiyuki Kato, Yasunori Tanami, Astuo Morinaga

Published Jan 1, 2004• 1 citation
Publisher

Abstract

We developed the delta-kick cooling to three dimensions using the Ioffe-Pritchard potential. The alternating oscillation of atomic momentum and size was observed. This phenomenon implies that the elongated atomic distribution was rotating in phase space.
DOI
10.1364/iqec.2004.itui24

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Delta-kick cooling (DKC) is used to compress the momentum distribution of ultracold quantum matter. It combines expansion dynamics with the use of kick pulses, designed via classical methods, that bring the system to rest. We introduce an exact approach to DKC for arbitrary scale-invariant dynamics of quantum gases, lifting the original restrictions to free evolution and noninteracting systems, to account for the control of atomic clouds in a time-dependent harmonic trap that can be either repulsive (inverted) or confining. We show that DKC assisted by a repulsive potential outperforms the conventional scheme, and that sudden trap-frequency quenches combined with DKC are equivalent to time-optimal bang-bang protocols. We further show that reverse engineering of the scale-invariant dynamics under smooth trap-frequency modulations can be combined with DKC to introduce a new class of shortcuts to adiabaticity assisted by kicks.