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arXiv · 2307.08055

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

Dominik Schäffner·Tobias Schreiber·Fabian Lenz·Malte Schlosser·Gerhard Birkl
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Abstract

We implement a scalable platform for quantum sensing comprising hundreds of sites capable of holding individual laser-cooled atoms and demonstrate the applicability of this single-quantum-system sensor array to magnetic-field mapping on a two-dimensional grid. With each atom being confined in an optical tweezer within an area of 0.5 micrometer^2 at mutual separations of 7.0(2) micrometer, we obtain micrometer-scale spatial resolution and highly parallelized operation. An additional steerable optical tweezer allows for a rearrangement of atoms within the grid and enables single-atom scanning microscopy with sub-micron resolution. This individual-atom sensor platform finds its immediate application in mapping an externally applied DC gradient magnetic field. In a Ramsey-type measurement, we obtain a field resolution of 98(29) nanotesla. We estimate the sensitivity to 25 microtesla/Hz^1/2.

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Dominik Schäffner, Tobias Schreiber, Fabian Lenz, Malte Schlosser, Gerhard Birkl. 2023-07-16. Quantum Sensing in Tweezer Arrays: Optical Magnetometry on an Individual-Atom Sensor Grid. https://doi.org/10.1103/prxquantum.5.010311

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