Tunable cavity coupling of a single SnV$^{-}$ center in nanodiamond across bad-emitter and bad-cavity regimes

• URL: http://arxiv.org/abs/2507.06553v1
• Date: Wed, 09 Jul 2025 05:11:39 GMT
• Title: Tunable cavity coupling of a single SnV$^{-}$ center in nanodiamond across bad-emitter and bad-cavity regimes
• Authors: Selene Sachero, Robert Berghaus, Elena Nieto Hernandez, Florian Feuchtmayr, Niklas Lettner, Patrick Maier, Sviatoslav Ditalia Tchernij, Alexander Kubanek,
• Abstract summary: Group IV vacancy centers in diamond have emerged as promising candidates due to their spectral stability.<n>We demonstrate controlled couplinag of a single negatively charged tin vacancy center hosted in a nanodiamond to a fully tunable Fabry-Perot microcavity.
• Score: 34.30731791559962
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Efficient coupling between quantum emitters and optical cavities is essential for scalable quantum photonic technologies. Group IV vacancy centers in diamond, particularly the negatively charged tin-vacancy center, have emerged as promising candidates due to their spectral stability, high Debye-Waller factor and large orbital splitting in ground-states. Here, we demonstrate controlled couplinag of a single negatively charged tin vacancy center hosted in a nanodiamond to a fully tunable Fabry-Perot microcavity. At cryogenic temperatures, we access the weak coupling regime and observe a transition from the bad-emitter to the bad-cavity regime as the optical transition of the color center narrows. At 4 K, a Purcell factor exceeding 1.7 is measured, confirming cavity-enhanced emission. The obtained results demonstrate the potential of SnV$^{-}$ centers in nanodiamonds as a coherent single-photon source for quantum networks.

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