Quantum optical few-mode models for lossy resonators

Speaker: Dominik Lentrodt (ALU Freiburg, Buchleitner group)

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Title: Quantum optical few-mode models for lossy resonators

Speaker: GHE Fellow Dominik Lentrodt (ALU Freiburg, Buchleitner group)

Date: May 16th 2023 @ 12:15

Place: University of Basel, New lecture hall 1

Abstract:

Few-mode models – such as the Jaynes-Cummings model and its generalisations – have been an indispensable tool in studying light-matter interactions in resonator and cavities. Recent experiments, however, have revealed novel regimes featuring strong light-matter coupling in combination with large resonator losses, where the applicability of these theoretical approaches is unclear.

In this talk, we will discuss recent extensions of few-mode models and an associated class of loss-induced multi-mode effects. In particular, we will introduce an exact basis transformation to derive few-mode theory from first principles and a simple classification criterion for the appearance of multi-mode effects in lossy resonators. We will further outline open problems, the relation to alternative approaches, and implications for recent experiments in x-ray cavity QED with Mössbauer nuclei – an emerging platform at the high-energy frontier of quantum optics, featuring lossy resonators doped with ultra-low decoherence emitters.