We propose and demonstrate chip-scale based all-optical remote magnetic sensing. Specifically, we remotely interrogate mm-scale micromachined vapor cells and measure the ambient magnetic field with at a standoff distance of ~10 meters and a sensitivity of ~1 pT/√Hz. Simultaneously we are able to measure the distance between the micro-cell and the interrogating system by means of time-of-flight measurements, thus correlating between position and magnetic field. Consequently, we provide a novel toolset to remotely map arbitrary, remote and hard to access magnetic field in an unshielded environment with high sensitivity and spatial resolution.
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