2025/07/09 by Sachero, Selene, Berghaus, Robert, Hernandez, Elena Nieto +5
#FOS: Physical sciences #Quantum Physics (quant-ph)
paper · doi:10.48550/arxiv.2507.06553
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.