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Q: Fachverband Quantenoptik und Photonik
Q 42: Open Quantum Systems I (joint session Q/QI)
Q 42.3: Talk
Wednesday, March 12, 2025, 15:15–15:30, HS I
Open system dynamics with quantum degenerate gases — •Julian Lyne1,2, Nico Baßler2,1, Kai Phillip Schmidt2, and Claudiu Genes1,2 — 1Max Planck Institute for the Science of Light, Staudtstraße 2, D-91058 Erlangen, Germany — 2Department of Physics, Friedrich-Alexander Universität Erlangen-Nürnberg (FAU), Staudtstraße 7, D-91058 Erlangen, Germany
An ensemble of coupled two-level quantum emitters may display collective radiative effects such as super- and subradiance. Such systems are usually treated within the standard open system theory of quantum optics, where small emitter separations lead to collective decay channels and coherent dipole-dipole interactions. This approach can be extended to the quantum degenerate regime [1], where there is an interplay between the particle statistics and the effects brought on by the cooperative radiative response. In the quantum degenerate regime already for independent emitters the rate of spontaneous emission can be enhanced for bosons, as intuitively expected by the symmetrization condition of the wavefunction, and may be completely suppressed for fermions, owing to the Pauli exclusion principle. We present our recent work investigating radiative properties of harmonically trapped fermionic and bosonic atomic gases using a master equation approach, where we investigate some restricted many-body scenarios and employ cumulant expansion methods.
[1] M. Lewenstein et al., Physical Review A 50, 2207 (1994).
Keywords: Quantum degenerate gases; Open quantum systems; Many-body physics; Superradiance