SAMOP 2023 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 18: Quantum Optics: Cavity and Waveguide QED I

Q 18.5: Vortrag

Dienstag, 7. März 2023, 12:15–12:30, E214

Light-matter interaction at the transition between cavity and waveguide QED — •Daniel Lechner, Riccardo Pennetta, Martin Blaha, Philipp Schneeweiss, Jürgen Volz, and Arno Rauschenbeutel — Humboldt Universität zu Berlin, Institut für Physik, Newtonstr. 15, 12489 Berlin

The interaction between a light field and an ensemble of quantum emitters is usually described in the framework of cavity quantum electrodynamics (QED) or waveguide QED. The choice depends on whether the emitters interact with a single-mode light field confined in a resonator or a propagating one, for which a continuum of frequency modes is allowed. These two branches of quantum optics share the common goal of harnessing light-matter coupling. However, they often use very different experimental set-ups and theoretical descriptions. Here, we experimentally and theoretically explore the transition from cavity to waveguide QED with an ensemble of cold atoms that is coupled to a fiber-ring resonator containing a nanofiber section. By changing the length of the resonator from a few meters up to several tens of meters, we tailor the spectral density of modes of the resonator without affecting the system's cooperativity parameter. We demonstrate that for progressively longer resonators, the paradigmatic Rabi oscillations of cavity QED gradually vanish while signatures of the dynamics typical for waveguide QED appear.