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Q: Fachverband Quantenoptik und Photonik

Q 61: Quantum Optics (Miscellaneous)

Q 61.2: Poster

Donnerstag, 17. März 2022, 16:30–18:30, P

Tracking Rydberg state dynamics to study the effect of long-range dipole-dipole interactions on Superradiance — •Elmer Suarez, Philip Wolf, Patrizia Weiss, and Sebastian Slama — Center for Quantum Science and Physikalisches Institut, Eberhard-Karls Universität Tübingen, Auf der Morgenstelle 14, 72076 Tübingen, Germany

We report on the real-time detection of internal-state dynamics of cold Rubidium atoms being excited to the 30D_5/2 Rydberg state via two-photon excitation. The atoms are overlapped with the mode of an optical cavity and excited by two laser beams transverse to the cavity axis. The excitation changes the collective atom-cavity coupling, which we detect by measuring the cavity transmission. We observe not only the excitation dynamics, but also the transfer of population from the Rydberg state to other neighbouring states due to black-body radiation, and the decay back to the ground state. Moreover, we find a superradiant enhancement of this decay and a density-dependent mitigation of superradiance which we attribute to dipole-dipole interactions between atoms in neighbouring Rydberg states. The findings contribute to resolve a recent controversy on the role of BBR-induced superradiance in cold atomic gases.