Coherent optical and spin spectroscopy of nanoscale Pr3+:Y2O3

TL;DR

This study explores the optical and spin properties of nanoscale Pr3+:Y2O3 particles, demonstrating their potential for quantum technologies through detailed spectroscopic measurements and hyperfine structure analysis.

Contribution

It provides the first detailed hyperfine structure characterization and spin coherence measurements of nanoscale Pr3+:Y2O3, highlighting its suitability for quantum device integration.

Findings

Optical inhomogeneous linewidths of 27 GHz measured.

Spin coherence times up to 880 microseconds achieved.

Hyperfine structures characterized by spectral hole burning.

Abstract

We investigate the potential for optical quantum technologies of Pr3+:Y2O3 in the form of monodisperse spherical nanoparticles. We measured optical inhomogeneous lines of 27 GHz, and optical homogeneous linewidths of 108 kHz and 315 kHz in particles of 400 nm and 150 nm average diameters respectively for the 1D2(0)--> 3H4(0) transition at 1.4 K. Furthermore, ground state and 1D2 excited state hyperfine structures in Y2O3 are here for the first time determined by spectral hole burning and modeled by complete Hamiltonian calculations. Ground-state spin transitions have energies of 5.99 MHz and 10.42 MHz for which we demonstrate spin inhomogeneous linewidths of 42 and 45 kHz respectively. Spin T2 up to 880 microseconds was obtained for the +-3/2-->+-5/2 transition at 10.42 MHz, a value which exceeds that of bulk Pr3+ doped crystals so far reported. These promising results confirm nanoscale Pr3+:Y2O3 as a very appealing candidate to integrate quantum devices. In particular, we discuss here the possibility of using this material for realizing spin photon interfaces emitting indistinguishable single photons.