Düsseldorf 2007 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 60: Fallen und Kühlung (gemeinsam mit A)

Q 60.4: Vortrag

Donnerstag, 22. März 2007, 14:45–15:00, 5D

Noise reduction in a cold atomic trapped sample — •Jerome Esteve, Andreas Weller, Jens Appmeier, Christian Gross, Rudolf Gati, and Markus Oberthaler — Kirchhoff Institut für Physik, Im Neuenheimer Feld 227, 69120 Heidelberg

In typical cold atom experiments, the fluctuations of the total atom number in the trap are dominated by technical fluctuations and are usually bigger than shot-noise. Reducing these fluctuations as much as possible is of great interest for numerous experiments. In particular, it is a prerequisite to the generation of entangled states in Bose-Einstein condensates since many entanglement schemes rely on the knowledge of the absolute atom number. In this presentation, we will show experimental results where the total atom number fluctuations in an optical dipole trap are strongly reduced down to approximately the shot-noise level by introducing three body losses in the sample. We will discuss the minimal noise that can be achieved by this method and show that sub-shot-noise fluctuations should indeed be observable.