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Flexible Rydberg aggregates are assemblies of highly excited light atoms, which are set into directed motion by resonant dipole-dipole interactions.
They feature an adiabatic entanglement transport mechanism reminiscent of Newton's cradle [1] and conical intersections (CIs) of excitonic Born-Oppenheimer surfaces [2].
In two dimensional Rydberg aggregates both phenomena co-exist, and we show that the CIs provide a sensitive knob controlling the propagation direction and coherence properties of entanglement transporting exciton pulses [3]. This turns the non-adiabatic effects near the CI from a de-coherence source into an asset.
[1] S. Wüster, C. Ates, A. Eisfeld and J.M. Rost, Phys. Rev. Lett. 105 (2010) 195392.
[2] S. Wüster, A. Eisfeld and J.M. Rost, Phys. Rev. Lett. 106 (2011) 153002.
[3] K. Leonhardt, S. Wüster and J.M. Rost, in preparation (2013).
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