Abstract
We present a magnetic field imaging technique based on spatially resolved detection of Larmor precession. An optically trapped, elongated, and cold atomic sample of rubidium serves as magnetic field probe. We detect Larmor precession with a spatial and a temporal resolution of ∼50μm and ∼120μs, respectively. Projection-noise limited absorption imaging, feasible with current technologies, implies a sensitivity of ∼10pT/Hz at 50μm resolution; addition of an optical lattice could give ∼300fT/Hz sensitivity.
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