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Q: Fachverband Quantenoptik und Photonik

Q 29: Poster – Quantum Technologies I

Q 29.25: Poster

Dienstag, 3. März 2026, 17:00–19:00, Philo 2. OG

An all-optical magnetic field quantum sensor based on an ensemble of Tin-vacancy color centers in diamond — •Anna Fuchs, Fabian Voltz, and Christoph Becher — Universität des Saarlandes, Saarbrücken 66123, Germany

Quantum sensing promises new opportunities in applied physics and life sciences due to high sensitivity, precision, and high spatial resolution. A possible implementation of a quantum sensor that became well known in recent years is based on NV centers in diamond. Whereas NV center based quantum sensors are based on microwave manipulation of their spin states, the negatively charged group IV-vacancy centers in diamond offer the option of an all-optical, microwave-free coherent control of their spin states. This allows for applications where the use of microwave fields is detrimental or technically challenging.
We here investigate an ensemble of negatively charged Tin-vacancy (SnV⁻) centers for its suitability for quantum sensing. To this end we use an experimental implementation based on coherent population trapping where two spin states are coupled to an excited state via two laser fields. To detect small magnetic changes we fix the laser frequency to the steepest slope of the dark-state resonance and detect the Zeeman shift by a change in the absorption signal. We report first experimental results on characterising our sample for achievable sensitivities.

Keywords: Coherent population trapping; Sensing; Tin-vacancy; Ensemble; Diamond