Hannover 2010 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 10: Quantum Gases: Bosons II

Q 10.10: Vortrag

Montag, 8. März 2010, 18:45–19:00, E 001

Single Cs Atoms Interacting with an Ultracold Rb Cloud — •Nicolas Spethmann, Wolfgang Alt, Shincy John, Oskar Fetsch, Claudia Weber, Artur Widera, and Dieter Meschede — Institut für Angewandte Physik, 53115 Bonn, Deutschland

While single Cs atoms can be coherently controlled to a high degree, in these systems coherent interactions are still challenging to obtain. In contrast, in quantum gases coherent interactions naturally emerge whereas manipulation and detection with single particle control is still not routinely performed.

We aim on combining the advantages of both methods by controlled immersion of single and few Cs atoms in an ultracold cloud of Rb atoms. We trap single and few Cs atoms in a high-gradient magneto-optical trap (MOT) and observe the loading dynamics through fluorescence detection. A Rb ensemble is cooled in a magnetic trap and then transferred to a crossed dipole trap at the position of the Cs MOT. In this purely optical trap the Rb can be further cooled to quantum degeneracy. By transferring the Rb to a magnetic field insensitive state, it is possible to switch on the single atom MOT without affecting the Rb cloud. We will report on the status of using the single atoms to probe the Rb cloud in various temperature regimes.