Berlin 2014 – scientific programme
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A: Fachverband Atomphysik
A 28: Poster: Ultra-cold plasmas and Rydberg systems (with Q)
A 28.4: Poster
Tuesday, March 18, 2014, 16:30–18:30, Spree-Palais
Optical control of Rydberg aggregates embedded in a dense atomic gas — •Sebastian Wüster1, Michael Genkin1, Alexander Eisfeld1, and Shannon Whitlock2 — 1Max Planck Institute for the Physics of Complex Systems, Dresden — 2Physikalisches Institut, Universität Heidelberg
We find that Rydberg impurities created within a host cold atom cloud realize a system in which excitation transport can be monitored and through the same mechanism continuously tuned between the quantum coherent, classically diffusive and quantum Zeno regimes.
Controllable decoherence and monitoring are both provided by state dependent interactions of the impurities with the background gas, which is electromagnetically rendered transparent [1,2].
We describe the physical process through which the coupling to the background gas de-coheres the quantum excitation transport taking place among the impurities (aggregate), and find that the de-coherence time is naturally reached once enough information is gathered on the excitation location, thus collapsing the wave function. Using an effective description for the aggregate alone, we then investigate how various regimes of transport can be realized.
[1] G. Günter, M. R. de Saint-Vincent, H. Schempp, C. S. Hofmann, S. Whitlock, and M. Weidemüller, Phys. Rev. Lett. 108, 013002 (2012).
[2] B. Olmos, W. Li, S. Hofferberth, and I. Lesanovsky, Phys. Rev. A 84, 041607(R) (2011).