Heidelberg 2015 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 32: Poster: Ultracold Atoms, Ions and BEC (with A)

Q 32.27: Poster

Dienstag, 24. März 2015, 17:00–19:00, C/Foyer

Single Atom Detection in Ultracold Quantum Gases — •Carola Rogulj, Tobias Menold, Malte Reinschmidt, Peter Federsel, Markus Stecker, Hannah Schefzyk, Andreas Günther, and József Fortágh — Physikalisches Institut, Universität Tübingen, Germany

Investigating quantum gases beyond the mean field approach, has become one of the main research topics in quantum-atom optics. Therefore, single atom detection techniques have to be developed, which allow for measuring statistics and correlations in ultracold quantum gases.

Our approach uses a state- and energy-selective ionization scheme, to realize a time-resolved single atom detector. We demonstrate the performance of this detector, by measuring dynamical processes, like center-of mass oscillations or shape oscillations, in real-time with high detection efficiency. This way, we demonstrate force spectroscopy and measure the energy distribution of trapped quantum gases in-situ. Having access to temporal correlations, we realize noise-spectroscopy on ultracold quantum gases, which proof the detection scheme to be suitable for realizing quantum galvanometer [1].

To extend the single atom detection to the spatial regime, we develop a novel high resolution ion microscope, which allows for magnifications up to 1000 and spatial resolution below the optical diffraction limit. We present both, the simulations and the first experimental realization of such a time- and space-resolved single atom detector.

[1] Kalman et al., Nano Letters 12, 435-439 (2012)