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In this work, we study and demonstrate subwavelength resolutions in a quantumgas microscope experiment. The method that we implement uses the laser driveninteraction between excited states to engineer hyperfine ground statepopulation transfer on subwavelength scales. The performance of the method isfirst characterized by exciting a single subwavelength volume within theoptical resolution of the microscope. These measurements are in quantitativeagreement with the analytical solution of a three-level system model whichallows to understand and predict the capabilities of this method for any lightfield configuration. As a proof of concept, this subwavelength control of thescattering properties is then applied to image a diffraction-limited object: alongitudinal wavefunction with a harmonic oscillator length of 30 nm that wascreated in a tightly confined 1D optical lattice. For this purpose, we firstdemonstrate the ability to keep one single site and then to resolve itsnano-metric atomic density profile.

In situ subwavelength quantum gas microscopy using dressed excited states