Journal
PHYSICAL REVIEW X
Volume 2, Issue 3, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevX.2.031011
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Funding
- Deutsche Forschungsgemeinschaft (DFG) [SFB/TRR21, PF 381/4-2]
- ERC [267100]
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We present experiments measuring an interaction-induced phase shift of Rydberg atoms at Stark-tuned Forster 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 Forster coupling sequence allows for observation of coherent dynamics around the Forster resonance.
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