Freiburg 2024 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 38: Poster IV

Q 38.11: Poster

Wednesday, March 13, 2024, 17:00–19:00, KG I Foyer

Real-world NV-center vector magnetometry of a 3D coil system — •Dennis Lönard, Stefan Dix, Isabel Barbosa, and Artur Widera — Physics Department and State Research Center OPTIMAS, RPTU Kaiserslautern-Landau, 67663 Kaiserslautern, Germany

The nitrogen-vacancy (NV) color center in diamond is an essential platform for magnetic field sensing for technical and biological applications. One major advantage is that the spin state of the NV-center can be read out optically via fluorescence. Observing the Zeeman-splitting of four independent NV axes in one diamond then enables full vectorial magnetometry. The signal detection of the NV fluorescence can be substantially improved with lock-in amplification. However, discussions of magnetic field sensitivity are often limited to artificially engineered lab conditions. Technical difficulties that arise when NV magnetometry is to be performed in unknown magnetic fields are often disregarded.

Here, we present a real-world measurement of the vector magnetic field of a 3D coil system, used in a quantum gases experiment. Our sensor exhibits magnetic field sensitivities down to 200nT/rt(Hz) with bandwidths of up to 100Hz. Thus showing the improvements NV center magnetometry can deliver over conventional instruments like Hall-sensors. Signal-to-Noise ratio and magnetic field sensitivity can be further improved with balanced photodiode detection techniques.

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