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Interfacing light and matter at the quantum level is at the heart of modern atomic and optical physics and enables new quantum technologies involving the manipulation of single photons and atoms.A prototypical atom-light interface is electromagnetically induced transparency,in which quantum interference gives rise to hybrid states of photons and atoms called dark-state polaritons.Rydberg gases represent an ideal system to explore the interplay between coherent light excitation and dipolar inter-atomic interactions [1,2].We have observed individual dark-state polaritons as they propagate through an ultra-cold atomic gas involving Rydberg states [3].To further explore the dynamics of the dark-state polaritons,we have implemented a new all-optical method to in-situ image Rydberg atoms embedded in dense atomic gases [4].Using this novel technique we show single shot images of small numbers of Rydberg atoms,allowing one to study the dynamics of strongly correlated many-body states as well as transport phenomena in Rydberg aggregates.We observe the migration of Rydberg electronic excitations,driven by quantum-state changing interactions similar to Forster processes found in complex molecules and light-harvesting complexes.The many-body dynamics of the energy transport can be influenced by an dissipative environment consisting of atoms in different Rydberg states,which can be controlled through the laser parameters [5].