Spin decoherence dynamics of Er$^{3+}$ in CeO$_2$ film

• URL: http://arxiv.org/abs/2508.12429v1
• Date: Sun, 17 Aug 2025 16:52:20 GMT
• Title: Spin decoherence dynamics of Er$^{3+}$ in CeO$_2$ film
• Authors: Sagar Kumar Seth, Jonah Nagura, Vrindaa Somjit, Aneesh Bapat, Xinhao Li, Gregory D. Grant, Ignas Masiulionis, Xu Han, F. Joseph Heremans, Giulia Galli, David D. Awschalom, Supratik Guha, Jiefei Zhang,
• Abstract summary: We show a new platform of Er$3+$:CeO$$ films on silicon, offering low nuclear spin density and the potential for on-chip integration.<n>We identify spectral diffusion-induced Er$3+$ spin flips as the dominant decoherence mechanism and provide pathways to millisecond-scale coherence.
• Score: 4.9111872278791395
• License: http://creativecommons.org/licenses/by-nc-sa/4.0/
• Abstract: Developing telecom-compatible spin-photon interfaces is essential towards scalable quantum networks. Erbium ions (Er$^{3+}$) exhibit a unique combination of a telecom (1.5 $\mu$m) optical transition and an effective spin-$1/2$ ground state, but identifying a host that enables heterogeneous device integration while preserving long optical and spin coherence remains an open challenge. We explore a new platform of Er$^{3+}$:CeO$_2$ films on silicon, offering low nuclear spin density and the potential for on-chip integration. We demonstrate a 38.8 $\mu$s spin coherence, which can be extended to 176.4\nobreakspace $\mu$s with dynamical decoupling. Pairing experiments with cluster correlation expansion calculations, we identify spectral diffusion-induced Er$^{3+}$ spin flips as the dominant decoherence mechanism and provide pathways to millisecond-scale coherence.

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