Freiburg 2024 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 7: Bosonic Quantum Gases II (joint session Q/A)

A 7.4: Vortrag

Montag, 11. März 2024, 17:45–18:00, Aula

An Optical Quantum Gas Magnifier for Lithium-7 Atoms — •Mathis Fischer, Justus Brüggenjürgen, and Christof Weitenberg — Institute for Quantum Physics, University of Hamburg, Luruper Chaussee 149, 22761 Hamburg, Germany

Ultracold gases in optical lattices are a pristine experimental platform for quantum simulation of complex many-body systems as they come with a high degree of control and a wide range of accessible observables. The advent of quantum gas microscopes has revolutionized the access to quantum many-body systems by detecting and addressing single particles on single lattice sites. The novel complementary approach of quantum gas magnification expands this toolbox to 3D systems and large occupation numbers. Here the atomic density distribution is magnified via matter-wave optics before taking absorption images with effective sub-lattice site resolution.

We report on the realization of an all-optical quantum gas magnifier for ultracold Lithium-7 atoms in triangular optical lattices i.e. using an optical dipole trap as matter-wave lens. The all-optical approach allows us to exploit the broad Feshbach resonance of Lithium to control the interaction strength. With this technique, we can access the coherence properties of the system. In the future, the optical matter-wave lens will also allow to image spin mixtures. Furthermore, the addition of high numerical aperture optics will allow for single-atom sensitivity via free-space fluorescence imaging.

Keywords: Quantum Gas Magnifier; Quantum Gas Microscopy; Matter-wave Optics; Talbot effect; Phase Coherence