Freiburg 2024 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 38: Poster IV
Q 38.28: Poster
Wednesday, March 13, 2024, 17:00–19:00, KG I Foyer
Coherent excitation of tin vacancy centres in diamond using a cross-polarization excitation scheme — •Dennis Herrmann, Robert Morsch, and Christoph Becher — Fachrichtung 7.2, Universität des Saarlandes, Campus E2.6, 66123 Saarbrücken, Germany
In recent years the tin vacancy centre (SnV) in diamond has raised interest in the QIP community as it offers bright and pure single photon emission into lifetime limited optical transitions combined with long spin dephasing times on the order of T2*∼ 5 µ s [1,2,3]. The coherent control of qubits and the generation of spin-photon entanglement typically requires resonantly driving optical transitions of the SnV centre. A spectral separation of excitation and emission wavelengths is highly desirable to discriminate the strong driving against single emitted photons. However, in the level scheme of the SnV centre we find that the large ground state splitting leads to a fast population decay from the upper to the lower orbital ground state making it necessary to excite and read out on the same optical transition. Here we deploy a homebuilt cross-polarisation confocal microscopy setup as demonstrated for semiconductor systems [4,5]. Offering polarisation extinction ratios of up to 107 it is enabling the strong polarisation selective suppression of laser light with respect to orthogonally polarised photons emitted on the same optical transition. Using short excitation pulses of below 250 ps we furthermore demonstrate coherent Rabi-Oscillations.
1. New J. Phys. 22, 013048 (2020). 2. npj Quantum Inf 8, 45 (2022). 3. Phys. Rev. X 11, 041041 (2021). 4. Phys. Rev. X 11, 021007 (2021). 5. Rev. Sci. Instrum. 84, 073905 (2013).