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Q: Fachverband Quantenoptik und Photonik

Q 47: Quantum Effects (QED) II

Q 47.5: Vortrag

Donnerstag, 14. März 2019, 11:30–11:45, S Gr. HS Maschb.

Ab-initio few-mode Hamiltonians for cavity QED — •Dominik Lentrodt, Kilian P. Heeg, Christoph H. Keitel, and Jörg Evers — Max-Planck-Institut für Kernphysik, Heidelberg, Germany

Few-mode models, such as the Jaynes-Cummings model, have been an indispensable tool in studying the quantum dynamics of light-matter interactions. In particular in cavity and circuit QED these models have been tremendously successful and have been employed in combination with the famous input-output formalism to compute, for example, scattering observables. Recently, however, extreme regimes, such as overlapping modes and ultra-strong coupling, have become accessible experimentally. In these regimes the applicability of input-output models has been debated [e.g. 1,2]. In this talk we will present an ab-initio method to construct few-mode Hamiltonians that apply even in such extreme regimes. Our theory extends the validity range of Jaynes-Cummings type models without abandoning their conceptual and computational simplicity. We show that the input-output formalism can be used to rigorously reconstruct the scattering information from such few-mode Hamiltonians, if a background contribution is accounted for. This enables the connection to a large body of theoretical methods that are based on few-mode and input-output models, which can now be applied in an ab-initio way. We will outline some implications, in particular for X-ray cavities, where new effects have already been observed [3]. Potential applications include quantum optics with exceptional points [4]. [1] Dutra J Opt B (2000) [2] Bamba PRA (2013) [3] Heeg et al PRL (2013) [4] El-Ganainy et al Nature Physics (2018)