SAMOP 2023 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 18: Quantum Optics: Cavity and Waveguide QED I

Q 18.2: Talk

Tuesday, March 7, 2023, 11:30–11:45, E214

Effective mode theory for open quantum systems — •Lucas Weitzel Dutra Souto, Felix Riesterer, Dominik Lentrodt, and Andreas Buchleitner — University of Freiburg, Germany

In the frequently employed theoretical approaches for open resonator QED systems, one usually considers a quantum emitter - such as an atom - in a cavity which interacts with a few discrete electromagnetic cavity modes. Losses and leakage from the cavity are modelled via a (weak) interaction with the environment. Models that employ this treatment, as is the case for the seminal Jaynes-Cummings model and its generalizations, have been tremendously successful in describing experiments. However, these models are intrinsically phenomenological and it is not known if they hold in all situations, as the underlying approximations are still unclear. For instance, in the case of strongly leaking systems, such as plasmonic cavities, this approach is not valid anymore and various theoretical assumptions need to be reassessed. We hence try to answer the following question: Is it possible to construct from first principles a few-mode description for leaky cavities in the spirit of the Jaynes-Cummings model? This will extend our theoretical understanding of more general systems or, in the case of a negative answer, lead to a no-go theorem.