Experiment reveals up to a 3.13-fold increase in ODMR contrast in NV ensembles, suggesting enhanced magnetometry performance despite inhomogeneous microwave fields.
Negatively charged nitrogen-vacancy (NV) centers in diamonds are commonly used in quantum magnetometry. However, the potential of this approach is often limited by the inhomogeneity of the driving field. In this study, we explore the potential of closed-loop quantum optimal control (QOC) to improve DC Ramsey magnetometry with NV-ensembles suffering from inhomogeneous microwave (MW) fields and MW power limitations. We demonstrate an improvement of the optically detected magnetic resonance (ODMR) contrast up to a factor of 3.13. This enables noticeable power savings for miniaturized devices without loss in magnetometry performance. Additionally, we show a recovery of 86.3 % of the ODMR contrast in presence of a five times less homogeneous MW field compared to the homogeneous field of a MW Helmholtz coil pair.
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Jauch et al. (2025) studied this question.
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