Preprint
Quantum Coherence of Rare-Earth Ions in Heterogeneous Photonic Interfaces
ArXiv.org
Cornell University
11/24/2025
DOI: 10.48550/arxiv.2511.19668
Abstract
Harnessing rare-earth ions in oxides for quantum networks requires integration with bright emitters in III-V semiconductors, but local disorder and interfacial noise limit their optical coherence. Here, we investigate the microscopic origins of the ensemble spectrum in Er $^{3+}$ :TiO $_2$epitaxial thin films on GaAs and GaSb substrates. Ab initio calculations combined with noise-Hamiltonian modeling and Monte Carlo simulations quantify the effects of interfacial and bulk spin noise and local strain on erbium crystal-field energies and inhomogeneous linewidths. Photoluminescence excitation spectroscopy reveals that Er $^{3+}$ions positioned at increasing distances from the III-V/oxide interface produce a systematic blue shift of the$Y_1\rightarrow Z_1$transition, consistent with strain relaxation predicted by theory. Thermal annealing produces a compensating redshift and linewidth narrowing, isolating the roles of oxygen-vacancy and gallium-diffusion noise. These results provide microscopic insight into disorder-driven decoherence, offering pathways for precise control of hybrid quantum systems for scalable quantum technologies.
Details
- Title: Subtitle
- Quantum Coherence of Rare-Earth Ions in Heterogeneous Photonic Interfaces
- Creators
- Henry C HammerHassan A BukhariYogendra LimbuBrett M WasickChristopher RouleauMichael E FlattéDurga PaudyalDenis R CandidoRavitej Uppu
- Resource Type
- Preprint
- Publication Details
- ArXiv.org
- DOI
- 10.48550/arxiv.2511.19668
- ISSN
- 2331-8422
- Publisher
- Cornell University; Ithaca, New York
- Language
- English
- Date posted
- 11/24/2025
- Academic Unit
- Electrical and Computer Engineering; Physics and Astronomy
- Record Identifier
- 9985034936402771
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