Observation of Three-Body Correlations for Photons Coupled to a Rydberg Superatom

Nina Stiesdal, Jan Kumlin, Kevin Kleinbeck, Philipp Lunt, Christoph Braun, Asaf Paris-Mandoki, Christoph Tresp, Hans Peter Büchler, Sebastian Hofferberth

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We report on the experimental observation of nontrivial three-photon correlations imprinted onto initially uncorrelated photons through an interaction with a single Rydberg superatom. Exploiting the Rydberg blockade mechanism, we turn a cold atomic cloud into a single effective emitter with collectively enhanced coupling to a focused photonic mode which gives rise to clear signatures in the connected part of the three-body correlation function of the outgoing photons. We show that our results are in good agreement with a quantitative model for a single, strongly coupled Rydberg superatom. Furthermore, we present an idealized but exactly solvable model of a single two-level system coupled to a photonic mode, which allows for an interpretation of our experimental observations in terms of bound states and scattering states.

TidsskriftPhysical Review Letters
Udgave nummer10
StatusUdgivet - 4. sep. 2018


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