Erlangen 2022 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 24: Quantum Effects

Q 24.9: Poster

Dienstag, 15. März 2022, 16:30–18:30, P

Revising cavity QED: Towards an accurate description of light-matter coupling — •Martin Blaha, Aisling Johnson, Arno Rauschenbeutel, and Jürgen Volz — HU Berlin, 12489 Berlin, Germany

The Jaynes-Cummings (JC) and Tavis-Cummings (TC) models are the standard descriptions of light-matter interaction between one or many emitters and a cavity field. In our work, we identify limits to these models, showing that they give inaccurate predictions if the emitter modifies the cavity field already significantly after a single roundtrip. This results in inaccurate predictions for the intra-cavity field, especially when investigating the case of coupling a large number of emitters to the cavity field [1].

To this end, we developed an alternative Hamiltonian by combining a waveguide approach with cavity QED, where we investigate the cascaded interaction between a propagating cavity field and each individual coupled emitter. This allows us to identify boundaries of validity of the JC and TC model. More importantly, solving our model we obtain predictions that substantially deviate from the predictions obtained from the JC and TC model, such as asymmetric vacuum-Rabi splitting, relevant for single emitters with almost perfect coupling to the cavity mode or the emergence of new resonances in the reflection spectra of resonators containing large ensembles of emitters [2].

[1] arXiv:2107.04583 (2021) [2] PRL 123 (24), 243602 (2019)