Mainz 2026 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 43: Poster – Quantum Systems

Q 43.10: Poster

Mittwoch, 4. März 2026, 17:00–19:00, Philo 2. OG

Experimental study of collective scattering beyond short-term burst dynamics — •Benedikt Saalfrank, Yoan Spahn, Thomas Halfmann, and Thorsten Peters — Institut für Angewandte Physik, Technische Universität Darmstadt, Hochschulstraße 6, 64289 Darmstadt, Germany

We experimentally investigate collective light scattering in a dilute, disordered ensemble of atoms confined within a hollow-core fiber. Starting from a fully inverted effective two-level system, we observe - under specific experimental conditions - scattering dynamics that persist beyond the short-term superfluorescent burst, indicating the presence of subradiant decay channels. By analyzing the autocorrelation function of the emitted light while accounting for temporal jitter and technical noise, we extract the intrinsic temporal correlations of the collective emission. In addition, we perform time-resolved measurements of the excited-state population during the decay. This combined approach allows us to quantify the fraction of atoms remaining in the initial state and relate it to the observed late-time decay rate.

Keywords: Collective Scattering; Correlation Functions; Waveguide