High-resolution spectroscopy of single Pr${}^{3+}$ ions on the ${}^3$H${}_4$-${}^1$D${}_2$ transition

Emanuel Eichhammer, Tobias Utikal, Stephan Götzinger +1

Rare earth ions in crystals exhibit narrow spectral features and hyperfine-split ground states with exceptionally long coherence times. These features make them ideal platforms for…