Bonn 2025 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 48: Poster – Quantum Optics, Technologies, and Optomechanics

Q 48.4: Poster

Wednesday, March 12, 2025, 17:00–19:00, Tent

Towards spatial magnetic field mapping with electrodynamically trapped NV center diamonds for quantum technology applications at ambient conditions — •Apurba Das, Deviprasath Palani, Florian Hasse, Ulrich Warring, and Tobias Schaetz — Physikalisches Institut, University of Freiburg, Hermann-Herder-Str. 3, 79104 Freiburg i. Br.

Electro-dynamically trapped micro-diamonds with Nitrogen-Vacancy (NV) center defects offer a suitable platform for fundamental studies. Protected by the diamond crystal, the NV center quantum system can act as a robust quantum sensor for harsh environments. The use of a Stylus Paul trap[1] enhances the accessibility of the trapped systems to external fields, enabling precise control and manipulation of electronic (and motional) degree of freedom. We report our work using trapped micro-diamonds on a Stylus trap for magnetic field mapping, building upon previous works on scanning probe magnetometry. Operating at room temperature and ambient pressure, we use optical trapping techniques to deterministically load diamonds onto the Stylus trap. By customizing the trapping potential, we demonstrate controlled transport of diamonds to specific positions and precise local magnetic field scanning, inspired by prior work with trapped ions[2]. Our work combines nanotechnology’s robustness with the precision of AMO physics, advancing scanning probe magnetometry and opening new possibilities for quantum sensing applications at ambient conditions.

[1] R. Maiwald et al, Nat. Phys 5, 551-554(2009)

[2] D. Palani et al, PRA 107, L050601(2023)

Keywords: Nitrogen Vacancy(NV) center diamonds; Quantum Sensing; Stylus Paul Trap; Magnetic field mapping; Loading technique