Hannover 2016 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 14: Ultracold plasmas and Rydberg systems I (with A)

Q 14.4: Talk

Monday, February 29, 2016, 17:45–18:00, f303

Coherence in a cold atom photon switch — •Weibin Li and Igor Lesanovsky — School of Physics and Astronomy, University of Nottingham, Nottingham, UK

We study coherence in a cold atom single photon switch where the gate photon is stored in a Rydberg spinwave. With a combined field theoretical and quantum jump approach and by employing a simple model description we investigate systematically how the coherence of the Rydberg spinwave is affected by scattering of incoming photons. With large-scale numerical calculations we show how coherence becomes increasingly protected with growing interatomic interaction strength. For the strongly interacting limit we derive analytical expressions for the spinwave fidelity as a function of the optical depth and bandwidth of the incoming photon.