Mainz 2026 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 28: Poster – Quantum Optics

Q 28.4: Poster

Dienstag, 3. März 2026, 17:00–19:00, Philo 2. OG

Controlling Quantum Gases in an Optical Cavity Through Continuous Measurement and Markovian Feedback — •Marcus Hofmann¹, Tobias Donner², Francesco Petiziol¹, and André Eckardt¹ — ¹Institut für Physik und Astronomie, Technische Universität Berlin, Hardenbergstraße 36, 10623 Berlin, Germany — ²Institute for Quantum Electronics, ETH Zürich, 8093 Zürich, Switzerland

Ultracold quantum gases in optical cavities represent a powerful platform for exploring driven-dissipative quantum many-body physics. They have enabled the experimental observation of collective non-equilibrium effects induced by atom-light interactions, ranging from atomic self-organization and superradiance to nonequilibrium topological phases. In this project, we theoretically investigate a quantum-gas cavity QED setup endowed with the possibility to perform active feedback conditioned on the output of continuous measurements of the cavity field, as it has been realized in experiments at ETH Zürich. After developing a theoretical and numerical framework to describe the system, based on Wiseman-Milburn's formalism of Markovian quantum feedback, we explore the opportunities to control the state of the atoms and influence their ordering patterns by means of realistic measurement and feedback schemes.