Bonn 2025 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 30: Quantum Sensing I (joint session Q/QI)

Q 30.4: Talk

Wednesday, March 12, 2025, 11:45–12:00, HS V

Limits of absolute vector magnetometry with NV centers in diamond — •Dennis Lönard, Isabel Cardoso Barbosa, Stefan Johansson, Jonas Gutsche, and Artur Widera — Department of Physics and State Research Center OPTIMAS, University of Kaiserslautern-Landau, 67663 Kaiserslautern, Germany

The nitrogen-vacancy (NV) center in diamond has established itself as a promising quantum sensing platform. Most notably, vector magnetometry can be performed by observing the Zeeman splitting of the NV's spin resonance frequencies. Relative magnetometry has been shown to reach magnetic-field sensitivities down to fT/rt(Hz), and the current literature contains many examples of how to improve these sensitivities. However, the accuracy of absolute magnetometry is limited by factors other than sensitivity, and formulas for computing the magnetic-field vector are often only approximated.

In this talk, we discuss exact, analytical, and fast-to-compute formulas for calculating the magnetic-field vector from measured resonance frequencies and vice versa. We do not use any approximations and find solutions that are exact within the measurement accuracy, valid for all ranges of magnetometry and all types of NV diamonds, and are much faster to compute than comparable numerical techniques. Finally, we discuss often-used approximations for these calculations and assess their validity and accuracy for different magnetic-field regimes. We developed an open-source Python package that includes all the shown formulas.

Keywords: nitrogen-vacancy center; magnetometry; nv-center; diamond; sensor