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THU: Thursday Contributed Sessions

THU 13: Poster Session: Applications

THU 13.68: Poster

Thursday, September 11, 2025, 16:30–18:30, ZHG Foyer 1. OG

Towards an all-optical magnetic field quantum sensor based on an ensemble of Silicon-vacancy color centers — •Anna Fuchs and Christoph Becher — Universität des Saarlandes, Saarbrücken 66123, Germany

Ensembles of SiV^- centers in diamond exhibit strong coherent light-matter interactions [1], enabling applications such as Raman-based optical quantum memories, the realization of single-photon nonlinearities and quantum sensors. In this work, we focus on a narrow spectral feature observed in spectral hole burning (SHB) measurements on an ensemble of SiV^- centers − a dip with a linewidth of only a few MHz. This sharp resonance is attributed to coherent population oscillations (CPO) and holds significant promise for the development of magnetic field quantum sensors based on SiV^- ensembles.
We experimentally investigate the response of this narrow CPO resonance to variations of the external magnetic field. In parallel, we perform simulations to quantify its magnetic field sensitivity theoretically. Based on our combined study, we evaluate the suitability of the CPO resonance as a sensitive, all-optical probe in diamond-based magnetic field quantum sensors.
[1] Weinzetl et al., Phys. Rev. Lett. 122, 063601 (2019)

Keywords: Silicon-vacancy; quantum magnetic field sensor; spin coherence; ensembles; spectral hole burning