Freiburg 2024 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 63: Strong Light-Matter Interaction

Q 63.1: Talk

Friday, March 15, 2024, 11:00–11:15, HS 3118

A stochastic approach to exact dynamics and tunneling in the generalized open Dicke model — •Kai Müller and Walter T. Strunz — Institut für Theoretische Physik, Technische Universität Dresden, D-01062 Dresden, Germany

As a fundamental model of quantum optics, the Dicke model has been known and studied for a long time. Recently, however, interest in this model has been revived by the emergence of numerous Cavity QED experiments that allow the controlled realisation of the Dicke model (and its generalised versions) over a wide parameter regime. In the thermodynamic limit N→∞ the mean-field solution of the Dicke model becomes exact, but to study the emergence of genuine quantum effects in the dynamics of these systems at finite N, a description that goes beyond mean-field theory is required. Here, we present a novel open-system method that allows us to push the boundary for the exact numerical solution of the model up to a mesoscopic number of atoms (N≈ 500) and to investigate the deficiencies of a mean-field description in this regime. We explore in which parameter regions true quantum effects, such as tunneling, become relevant for the dynamics and observable in experiments.

Keywords: Cavity QED; Open Quantum Systems; Dicke Model; Bistability