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

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.

6 pages, 4 figures