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We implemented a scalable platform for quantum sensing comprising hundreds ofsites capable of holding individual laser-cooled atoms and demonstrate theapplicability of this single-quantum-system sensor array to magnetic-fieldmapping on a two-dimensional grid. With each atom being confined in an opticaltweezerwithin an area of 0.5 micrometer^2 at mutual separations of 7.0(2)micrometer, we obtain micrometer-scale spatial resolution and highlyparallelized operation. An additional steerable optical tweezer allows for arearrangement of atoms within the grid and enables single-atom scanningmicroscopy with sub-micron resolution. Our novel individual-atom sensorplatform finds its immediate application in mapping an externally applied DCgradient magnetic field. In a Ramsey-type measurement, we obtain a fieldresolution of 98(29) nanotesla. A calculation based on the net time of coherentevolution leads to a sensitivity of 20(7) nanotesla/Hz^1/2.

Quantum Sensing in Tweezer Arrays: Optical Magnetometry on an Individual-Atom Sensor Grid