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QI: Fachverband Quanteninformation

QI 20: Metrology and Sensing

QI 20.1: Vortrag

Freitag, 13. März 2026, 09:30–09:45, BEY/0137

Nitrogen Vacancy center based gradiometry: Towards unshielded magnetic biosensing applications — •Magnus Benke, Jixing Zhang, Michael Kübler, Yihua Wang, and Jörg Wrachtrup — 3rd Physics Insitute, University of Stuttgart, Stuttgart

Magnetometers based on Nitrogen Vacancy (NV) centers in diamond offer high sensitivities and spatial resolution, as well as a broad dynamic range. These properties allow for unshielded measurements by combining two or more sensors into a gradiometric array to suppress common-mode noise. In this work we present a DC-broadband gradiometer, comprised of two magnetometers using a CW-ODMR (Continuous-Wave Optically Detected Magnetic Resonance) measurement scheme. With this array we were able to effectively reduce an artificial background signal by 45 times without attenuating an applied test signal. For further detailed analysis of the noise floor, we equipped the sensors with flux concentrators to identify the different noise contributions in the signal.

Keywords: Nitrogen vacancy center; Magnetometry; Gradiometry