Site-Resolved Imaging of NaRb Feshbach Molecules in an Optical Lattice

Applying the technique of quantum gas microscopy to polar molecules presents an attractive platform for the quantum simulation of many-body systems with long-range interactions. Here, we present our work toward site-resolved imaging of ²³Na⁸⁷Rb Feshbach molecules in a 2D optical lattice. We prepare quasi-2D dual Na and Rb BECs in a highly anisotropic light sheet optical potential that provides tight vertical confinement. A bichromatic, tightly focused "dimple" trap allows us to reliably produce BECs with small, stable atom number. We load the dual BECs into a 2D optical lattice and ramp through a Feshbach resonance to produce a sparse gas of NaRb Feshbach molecules, optically removing remaining atoms. The molecules are dissociated in the lattice for site-resolved fluorescence imaging of Rb atoms. In future work, we will overlap dual Mott insulators of Na and Rb to form a low-entropy array of NaRb Feshbach molecules. We also plan to coherently transfer the weakly-bound molecules to the absolute ground state, realizing a platform for single-site detection and manipulation of polar molecules.