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arXiv · 1203.1851

Förster interaction induced phase shift in a pair state interferometer

J. Nipper·J. B. Balewski·A. T. Krupp·S. Hofferberth·R. Löw·T. Pfau
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Abstract

We present experiments measuring an interaction induced phase shift of Rydberg atoms at Stark tuned Förster resonances. The phase shift features a dispersive shape around the resonance, showing that the interaction strength and sign can be tuned coherently. We use a pair state interferometer to measure the phase shift. Although the coupling between pair states is coherent on the time scale of the experiment, a loss of visibility occurs as a pair state interferometer involves three simultaneously interfering paths and only one of them is phase shifted by the mutual interaction. Despite additional dephasing mechanisms a pulsed Förster coupling sequence allows to observe coherent dynamics around the Förster resonance.

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J. Nipper, J. B. Balewski, A. T. Krupp, S. Hofferberth, R. Löw, T. Pfau. 2012-03-08. Förster interaction induced phase shift in a pair state interferometer. https://arxiv.org/abs/1203.1851

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