# Regensburg 2022 – wissenschaftliches Programm

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# HL: Fachverband Halbleiterphysik

## HL 25: Poster 1

### HL 25.48: Poster

### Mittwoch, 7. September 2022, 18:00–20:00, P2

Semiclassical and quantum optical field dynamics in an optical cavity with a finite number of quantum emitters — •Kevin Jürgens^{1}, Frank Lengers^{1}, Daniel Groll^{1}, Doris E. Reiter^{1,2}, Daniel Wigger^{3}, and Tilmann Kuhn^{1} — ^{1}Institute of Solid State Theory, University of Münster, Germany — ^{2}Condensed Matter Theory, Technische Universität Dortmund, Germany — ^{3}School of Physics, Trinity College Dublin, Ireland

Ensembles of quantum emitters (QE) coupled to the quantized light field inside a photonic cavity are promising building blocks in quantum technologies. Due to the interaction of several QEs with a single light mode, the emitters can produce interesting collective behavior. We calculate the spectra and dynamics of such an ensemble with up to N=60 emitters after excitation by a short external laser pulse within the Tavis-Cummings model and compare the findings with those obtained in the semiclassical limit (N → ∞) [1]. When increasing the pulse amplitude we find a sharp transition in the semiclassical limit from exciton-polariton-like behavior to Rabi oscillations. The full quantum calculations reproduce such a transition behavior independent of N, but in particular for smaller N the transition between these regimes is broadened over a certain range of pulse amplitudes.

Wigner functions are calculated to investigate the properties of the light field and show the emergence of quantum features [1]. On longer time scales we see the formation of N+1 quasi coherent states with Schrödinger-cat-like interferences between each pair.

[1] Jürgens et al., Phys. Rev. B 104, 205308 (2021)