Bonn 2025 – wissenschaftliches Programm
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QI: Fachverband Quanteninformation
QI 6: Quantum Metrology and Sensing (joint session QI/Q)
QI 6.4: Vortrag
Montag, 10. März 2025, 18:00–18:15, HS VIII
Enhancing NV-center magnetometer sensitivity for quantum sensing using flux concentrators — •Anjana Karuvayalil1, Jixing Zhang1, Michael Kübler1, Stephan Erlhoff2, Magnus Benke1, Yi hua Wang1, Pascal Schmidt1, Andrej Denisenko1, Cheuk Cheung1, and Jörg Wrachtrup1 — 13rd Institute of Physics, University of Stuttgart — 2Max Planck Institute, Stuttgart
Magnetic field sensing is a critical tool in fields such as geophysics, medical science, and magnetic field mapping. Existing magnetic field sensors, including OPMs and SQUIDs, provide high sensitivity but often come with limitations such as complexity or operational constraints. This work highlights the nitrogen-vacancy (NV) center-based magnetometer for its exceptional quantum properties making it more reliable for quantum sensing. The NV-center magnetometer achieved photon shot noise-limited sensitivity in the sub-picotesla range. This sensitivity can be further enhanced by incorporating flux concentrators near the diamond. These flux concentrators, designed and optimized using high permeable materials like MnZn and Permalloy, are capable of amplifying weak magnetic fields and significantly improving the effective sensitivity of the magnetometer. They are precisely machined to integrate seamlessly into the experimental setup. Continuous-Wave Optically Detected Magnetic Resonance (CW ODMR) is employed for measurements, with results showing that the use of flux concentrators leads to a 16-fold enhancement in sensitivity. This approach helps the detection of weak biosignals from muscles, the heart, and the brain.
Keywords: NV-center; Quantum sensing; Flux concentrator; Magnetic field sensing; NV-center magnetometer