We realize a quantum-gas microscope for fermionic 40 K atoms trapped in an optical lattice, which allows
one to probe strongly correlated fermions at the single-atom level. We combine 3D Raman sideband
cooling with high-resolution optics to simultaneously cool and image individual atoms with single-lattice-
site resolution at a detection fidelity above 95%. The imaging process leaves the atoms predominantly in
the 3D motional ground state of their respective lattice sites, inviting the implementation of a Maxwell’s
demon to assemble low-entropy many-body states. Single-site-resolved imaging of fermions enables the
direct observation of magnetic order, time-resolved measurements of the spread of particle correlations, and
the detection of many-fermion entanglement.
one to probe strongly correlated fermions at the single-atom level. We combine 3D Raman sideband
cooling with high-resolution optics to simultaneously cool and image individual atoms with single-lattice-
site resolution at a detection fidelity above 95%. The imaging process leaves the atoms predominantly in
the 3D motional ground state of their respective lattice sites, inviting the implementation of a Maxwell’s
demon to assemble low-entropy many-body states. Single-site-resolved imaging of fermions enables the
direct observation of magnetic order, time-resolved measurements of the spread of particle correlations, and
the detection of many-fermion entanglement.
