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High-resolution spectroscopy of single Pr$^{3+}$ ions on the $^3$H$_4$-$^1$D$_2$ transition (1504.00857v1)

Published 3 Apr 2015 in physics.atom-ph, physics.optics, and quant-ph

Abstract: 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 quantum information processing in the solid state. Recently, we reported on the first high-resolution spectroscopy of single Pr${3+}$ ions in yttrium orthosilicate (YSO) nanocrystals. While in that work we examined the less explored $3$H$_4$-$3$P$_0$ transition at a wavelength of 488 nm, here we extend our investigations to the $3$H$_4$-$1$D$_2$ transition at 606 nm. In addition, we present measurements of the second-order autocorrelation function, fluorescence lifetime, and emission spectra of single ions as well as their polarization dependencies on both transitions; these data were not within the reach of the first experiments reported earlier. Furthermore, we show that by a proper choice of the crystallite, one can obtain narrower spectral lines and, thus, resolve the hyperfine levels of the excited state. We expect our results to make single-ion spectroscopy accessible to a larger scientific community.

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