Quantum 2025 – scientific programme
Parts | Days | Selection | Search | Updates | Downloads | Help
THU: Thursday Contributed Sessions
THU 13: Poster Session: Applications
THU 13.59: Poster
Thursday, September 11, 2025, 16:30–18:30, ZHG Foyer 1. OG
Generation of Coherent Laser Fields for Coherent Population Trapping on Spin-Levels of the Tin-Vacancy Center in Diamond — •Linus Ehre, Robert Morsch, Dennis Herrmann, and Christoph Becher — Fachrichtung Physik, Universität des Saarlandes, Campus E2.6, D-66123, Germany
The negatively charged Tin-Vacancy color center in diamond (SnV−) is a promising candidate for solid-state quantum network nodes since it possesses optically accessible spin transitions and exhibits coherence times of up to T2=10ms [1] under dynamical decoupling.
All optical coherent control of the SnV− center’s spin state requires the use of two laser fields with sufficient phase coherence. Here, we show the generation of coherent sidebands from a single laser source by means of a free-space electro-optic phase modulator (EOPM). With our approach we demonstrate a coherent population trapping (CPT) scheme on the Zeeman-split spin states of a single SnV− center at temperatures of T=1.7K.
Successful observation of a characteristic dark resonance confirms sufficient phase correlation between the two laser fields and yields a lower bound on the spin dephasing time of T2*≥1.1(7)µs. Furthermore we develop simulations of the coherent population dynamics as well as of the photon emission process, hence, supporting the development of SnV− centers as reliable quantum network nodes.
[1] Karapatzkis, I. et. al.; Phys. Rev. X 14, 031036 (2024)
Keywords: Quantum Communication; Quantum Networks; Color Centers in Diamond; Electro-Optic Modulation; Coherent Population Trapping