Heidelberg 2015 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 76: Ultracold Plasmas and Rydberg Systems IV (with A)

Q 76.3: Vortrag

Freitag, 27. März 2015, 15:00–15:15, P/H2

Dipolar Dephasing of Rydberg D-state Polaritons — •Christoph Tresp¹, Przemyslaw Bienias², Sebastian Weber², Hannes Gorniaczyk¹, Ivan Mirgorodskiy¹, and Sebastian Hofferberth¹ — ¹5. Physikalisches Institut, Universität Stuttgart, Pfaffenwaldring 57, 70569 Stuttgart, Germany — ²3. Institut für theoretische Physik, Universität Stuttgart, Pfaffenwaldring 57, 70569 Stuttgart, Germany

We report on our current experiments investigating photon propagation through a cold Rubidium sample, by coupling the ground state to a long lived Rydberg D-state via electromagnetically-induced transparency (EIT). In addition to the strong nonlinearities known from similar experiments carried out with Rydberg S-states, we observe a decay of transmission over time. The rate of this decay strongly depends on the number of photons send into the medium. We attribute this effect to induced dipolar dephasing of Rydberg polaritons, which occurs for nonzero interaction angles of Rydberg pair-states and leads to stationary Rydberg excitations. For further understanding, we model our system by numerically solving the polariton propagation through our system, taking the full interaction problem into account.