| Coherent Population Trapping in a strongly interacting ultracold Rydberg gas will be presented. Despite the strong van der Waals interactions and interparticle correlations, one observes the persistence of a resonance with subnatural linewidth at the single-particle resonance frequency as the interaction strength is tuned. This narrow resonance cannot be understood within a meanfield description of the strong Rydberg-Rydberg interactions. Instead, a many-body density matrix approach, accounting for the dynamics of interparticle correlations, is shown to reproduce the observed spectral features. The influence of these effects on Electromagnetically Induced Transparency will be discussed. |
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