Mainz 2026 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 64: Poster – Ultra-cold atoms, ions and BEC (joint session A/Q)
Q 64.37: Poster
Donnerstag, 5. März 2026, 17:00–19:00, Philo 1. OG
Spin-resolved microscopy of an SU(N) Fermi-Hubbard system — •Leonardo Bezzo1, Carlos Gas-Ferrer1, Sandra Buob1, Antonio Rubio-Abadal1, and Leticia Tarruell1,2 — 1ICFO, Castelldefels (Barcelona), Spain — 2ICREA, Barcelona, Spain
Quantum-gas microscopes have provided direct access to the phases of the Fermi-Hubbard model. For SU(2) systems, they have brought microscopic insight into the complex competition between interactions, quantum magnetism, and doping. Alkaline-earth(-like) fermions extend this spin-1/2 paradigm by giving access to SU(N) Fermi-Hubbard models, with rich phase diagrams to be unveiled. Despite its fundamental interest, a microscopic exploration of SU(N) quantum systems has remained elusive. We report the realization of a quantum-gas microscope for fermionic 87Sr. Our fluorescence imaging scheme, based on cooling and detection on the narrow intercombination line at 689 nm, enables spin-resolved single-atom detection. By combining it with an optical pumping protocol, we are able to detect the 10 spin states occupation in a single experimental run, a crucial capability for probing site-resolved magnetic correlations. Moreover, we characterize the fundamental inelastic photon scattering processes that limit the site-resolved fidelity of our imaging protocol, and demonstrate an extension of our method that allows us to reach fidelities > 96% for systems up to SU(8). These results establish 87Sr quantum-gas microscopy as a powerful approach to study exotic magnetism in the SU(N) Fermi-Hubbard model, and provide a new detection tool with potential applications to quantum simulation, computation, and metrology.
Keywords: Ultracold Atoms; Quantum Simulation; Fermi-Hubbard Model; Quantum-Gas Microscopy; SU(N) systems