Spatially-selective in situ magnetometry of ultracold atomic clouds

Abstract

We demonstrate novel implementations of high-precision optical magnetometers which allow for spatially-selective and spatially-resolved in situ measurements using cold atomic clouds. These are realised by using shaped dispersive probe beams combined with spatially-resolved balanced homodyne detection. Two magnetometer sequences are discussed: a vectorial magnetometer, which yields sensitivities two orders of magnitude better compared to a previous realisation and a Larmor magnetometer capable of measuring absolute magnetic fields. We characterise the dependence of single-shot precision on the size of the analysed region for the vectorial magnetometer and provide a lower bound for the measurement precision of magnetic field gradients for the Larmor magnetometer. Finally, we give an outlook on how dynamic trapping potentials combined with selective probing can be used to realise enhanced quantum simulations in quantum gas microscopes.

arXiv comment9 pages, 7 figures

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• Progress toward a zero-magnetic-field environment for ultracold-atom experiments
• Single-shot Stern-Gerlach magnetic gradiometer with an expanding cloud of cold cesium atoms
• Grating magneto-optical trap of cesium atoms with an additional retroreflected laser beam
• Robust and compact single-lens crossed-beam optical dipole trap for Bose-Einstein condensation in microgravity