ECAMP 15

The development of quantum-gas microscopes has brought novel ways of probing quantum degenerate many-body systems at the single-atom level. Until now, most of these setups have focused on alkali atoms. Expanding quantum-gas microscopy to alkaline-earth elements as strontium will provide new tools, such as SU(𝑁)-symmetric fermionic isotopes or ultranarrow optical transitions, to the field of quantum simulation.
In my talk, I will present our recent development of strontium quantum-gas microscopy, which enables imaging of both Bose- and Fermi-Hubbard systems in a single-atom and single-site resolved manner. All experiments are performed in an optical lattice operating at the clock-magic wavelength, which will allow us to exploit the clock transition in the future.

For bosonic strontium-84, we demonstrate single-atom resolved imaging of strontium lattice superfluids. In a first series of experiments, we realize fluorescence imaging using the broad 461-nm transition, which provides high spatial resolution, while simultaneously performing attractive Sisyphus cooling with the narrow 689-nm intercombination line. We reconstruct the atomic occupation from the fluorescence images, obtaining imaging fidelities above 94%. Exploiting instead the narrow intercombination line for both fluorescence collection and Sisyphus cooling allows us to enhance the fidelities to above 98% while reducing the exposure time by an order of magnitude. Finally, we apply the narrow-line imaging scheme to fermionic strontium-87 and, exploiting the spectral selectivity of the intercombination line, demonstrate spin-resolved microscopy of a fermionic system with up to 10 internal states.

Our strontium quantum-gas microscope provides a new platform to study dissipative Hubbard models, quantum optics in atomic arrays, and SU(𝑁) fermions at the microscopic level.