Bonn 2025 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 36: Ultra-cold Atoms, Ions and BEC III (joint session A/Q)
Q 36.1: Hauptvortrag
Mittwoch, 12. März 2025, 11:00–11:30, KlHS Mathe
Microscopy of matter wave emission into a two-dimensional structured reservoir — •Felix Spriestersbach1,2, Jan Geiger1,2, Valentin Klüsener1,2, Immanuel Bloch1,2,3, and Sebastian Blatt1,2,3 — 1Max-Planck-Institut für Quantenoptik, 85748 Garching, Germany — 2Munich Center for Quantum Science and Technology, 80799 München, Germany — 3Fakultät für Physik, Ludwig-Maximilians-Universität München, 80799 München, Germany
We realize a quantum simulator of an open quantum system using ultracold bosonic strontium atoms trapped in a state-dependent, cavity-enhanced, two-dimensional optical lattice. Atoms in a metastable excited state are tightly trapped by the optical lattice, while ground-state atoms experience a weak periodic potential, enabling tunneling between neighboring lattice sites. Coupling the two states initiates the emission of matter waves, which are represented by the itinerant ground-state atoms. In the optical lattice, the matter waves show a dispersion relation akin to photons in nanophotonic structures. We can precisely control the energy of the matter waves by adjusting the detuning of the optical coupling. We measure the energy-dependent momenta by mapping momentum space to real space followed by read out using microscopy. Using this high level of control, we can alter the emission dynamics depending on the detuning of the coupling. These results demonstrate the possibility of experimentally investigating open quantum systems in two dimensions.
Keywords: quantum simulation; Strontium; optical lattice