Experimental platform for a 2D atom array quantum computer with non-destructive readout

We present an experimental platform for a 2D neutral Cs atom array quantum computer. Atoms are loaded into a 2D array of optical traps created using two orthogonal sets of blue-detuned tophat lines. Lambda grey molasses is used to cool atoms in traps to below 5 microKelvin. To determine the array occupation, atom fluorescence is collected by two 0.7 NA lenses at the front and back of the cell and imaged onto an EMCCD. A red-detuned tweezer is then used to rearrange atoms in the lattice to a desired pattern for a quantum computation. For our universal gate set, single qubit rotations are performed using a combination of global microwaves and site-selective Stark shift lasers; two qubit controlled-phase gates are implemented using two photon Rydberg excitation. For each Rydberg laser, two independent pairs of AODs allow for simultaneous atom addressing.

We also demonstrate atom cooling on the narrow quadrupole transition of Cs using detuned 685nm light. This cooling is used to reduce loss during atom readout. We also present a non-destructive, state-selective atom readout technique using the quadrupole transition.