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Phys Rev Lett. 2012 Jan 13;108(2):023005. Epub 2012 Jan 11.

Observation of a resonant four-body interaction in cold cesium Rydberg atoms.

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  • 1Laboratoire Aimé Cotton, CNRS, Univ Paris-Sud, Bâtiment 505, 91405 Orsay, France.


Cold Rydberg atoms subject to long-range dipole-dipole interactions represent a particularly interesting system for exploring few-body interactions and probing the transition from 2-body physics to the many-body regime. In this work we report the direct observation of a resonant 4-body Rydberg interaction. We exploit the occurrence of an accidental quasicoincidence of a 2-body and a 4-body resonant Stark-tuned Förster process in cesium to observe a resonant energy transfer requiring the simultaneous interaction of at least four neighboring atoms. These results are relevant for the implementation of quantum gates with Rydberg atoms and for further studies of many-body physics.

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