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Q: Fachverband Quantenoptik und Photonik

Q 62: Poster: Quantum Optics and Photonics III

Q 62.3: Poster

Donnerstag, 26. März 2015, 17:00–19:00, C/Foyer

Rydberg dressing of ultracold Potassium atoms via electromagnetically induced transparency — •Christoph Schweiger, Nils Pehoviak, Stephan Helmrich, Alda Arias, and Shannon Whitlock — Physikalisches Institut, Universität Heidelberg, Im Neuenheimer Feld 226, 69120 Heidelberg

We aim to use laser dressing of Rydberg states of ultracold potassium atoms to create and study novel strongly-correlated quantum gases with long-range interactions. Rydberg dressing, i.e. the small admixture of a Rydberg state to the ground state [1] can be realised via a single-photon transition or a two-photon transition in a three-level ladder scheme. We use a two-photon transition in an electromagnetically induced transparency (EIT) configuration to excite potassium-40 atoms to Rydberg states. The Rydberg state admixture and the lifetime of the dressed-states can be controlled by the ratio of the Rabi frequencies of the laser fields. We will describe a high-power narrow-linewidth laser system used to produce up to 2 W at a wavelength of 460 nm. It is stabilised using spectroscopy of Rydberg states using an EIT resonance using thermal atoms in a vapor cell. We will report our first experiments on EIT spectroscopy of potassium atoms, and discuss the prospects for creating long-range interacting fermionic quantum gases via Rydberg dressing.

[1] Balewski, J.B. et al. "Rydberg dressing: Understanding of collective many-body effects and implications for experiments", arXiv:1312-6346, 2013