Freiburg 2024 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 27: Phase Transitions
Q 27.1: Invited Talk
Wednesday, March 13, 2024, 11:00–11:30, Aula
Engineering of many-body states in a driven-dissipative cavity QED system — Rodrigo Rosa-Medina1, Fabian Finger1, Nicola Reiter1, Jakob Fricke1, Panagiotis Christodoulou1, Davide Dreon2, Alexander Baumgärtner1, Simon Hertlein1, Justyna Stefaniak1, David Baur1, Dalila Rivero1, Gabriele Natale1, Tilman Esslinger1, and •Tobias Donner1 — 1Institute for Quantum Electronics, ETH Zurich, 8093 Zurich, Switzerland — 2PASQAL SAS, 7 Rue Leonard de Vinci, 91300 Massy, France
Exposing a many-body system to external drives and losses can fundamentally transform the nature of its phases, and opens perspectives for engineering new properties of matter. How such characteristics are related to the underlying microscopic processes is a central question for our understanding of materials. A versatile platform to address it are quantum gases coupled to the dynamic light fields inside optical resonators. This setting allows to create synthetic many-body systems with tunable, well-controlled dissipation channels, and at the same time to induce cavity-mediated long-range atom-atom interactions. By engineering the involved light field modes, we study in real-time the dynamics of a phase transition between two such crystals. When the dissipation via cavity losses and the coherent timescales are comparable, we find a regime of limit cycle oscillations leading to a topological pumping of the atoms. In a second set of experiments, we make use of the cavity-mediated interaction to induce the formation of pairs of correlated atoms. We demonstrate that this process is based on the amplification of vacuum fluctuations.
Keywords: Cavity QED; topological pump; correlated pairs; Bose-Einstein condensate; many-body physics