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Narrow Optical Linewidths in Stoichiometric Layered Rare-Earth Crystals

Donny R. Pearson, Jr.1,2,*, Ashwith Prabhu1,2,*, Selvin Tobar3,2, Jack D’Amelio4,2, Amy Tram5,2, Zachary W. Riedel6,2,‡, Daniel P. Shoemaker6,2, and Elizabeth A. Goldschmidt1,2,†

  • *These authors contributed equally to this work.
  • †Contact author: goldschm@illinois.edu
  • ‡Present address: Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA.
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Phys. Rev. Lett. 134, 233603 – Published 13 June, 2025

DOI: https://doi.org/10.1103/p39m-pnvt

Abstract

Rare-earth emitters in solids are well suited for implementing efficient, long-lived quantum memory coupled to integrated photonics for scalable quantum technologies. They are typically introduced as dopants in a solid-state host, but this introduces disorder and limits the available density of emitters. Stoichiometric materials can offer high densities with narrow optical linewidths. The regular spacing of emitters also opens possibilities for quantum information processing and collective effects. Here, we show narrow optical linewidths in a layered stoichiometric crystalline material, NaEu(IO3)4. We observed an inhomogeneous linewidth of 2.2(1) GHz and a homogeneous linewidth of 120(4) kHz. Using spectral hole-burning techniques, we observe a hyperfine spin lifetime of 1.9(4) s. Furthermore, we demonstrate an atomic frequency comb delay of up to 800 ns.

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Phys. Rev. Lett. 134, 233603– Published 13 June, 2025
  • Received 3 March 2025
  • Revised 23 April 2025
  • Accepted 27 May 2025
Article part of CHORUS
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