Rostock 2019 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 47: Quantum Effects (QED) II
Q 47.6: Vortrag
Donnerstag, 14. März 2019, 11:45–12:00, S Gr. HS Maschb.
Cold-atom-based implementation of the Dicke model in the ultra-strong coupling regime — •Yijian Meng1, Alexandre Dareau1, Philipp Schneeweiss1, and Arno Rauschenbeutel1,2 — 1TU Wien-Atominstitut,Vienna, Austria — 2Department of Physics, Humboldt-Universität zu Berlin, Berlin, Germany
We realize a mechanical analogue of the Dicke model, achieved by coupling the spin of individual neutral atoms to their quantized motion in an optical trapping potential [1]. The atomic spin states play the role of the electronic states of the atomic ensemble considered in the Dicke model, and the in-trap motional states of the atoms correspond to the states of the electromagnetic field mode. The coupling between spin and motion is induced by an inherent polarization gradient of the trapping light fields [2], which leads to a spatially varying vector light shift. We experimentally show that our system reaches the ultra-strong coupling regime, i.e., we obtain a coupling strength which is a significant fraction of the trap frequency. Moreover, with the help of an additional light field, we demonstrate the in-situ tuning of the coupling strength. Beyond its fundamental interest, the demonstrated one-to-one mapping between the physics of optically trapped cold atoms and the Dicke model paves the way for implementing protocols and applications that exploit extreme coupling strengths.
[1] A. Dareau, Y. Meng, P. Schneeweiss, A. Rauschenbeutel, arXiv:1809.02488
[2] P. Schneeweiss, A. Dareau, and C. Sayrin, Phys. Rev. A 98, 021801(R) (2018)