Judd-Ofelt analysis and coherent spectroscopy of europium-based molecular complexes for quantum information applications
Abstract
Rare-earth-ion based molecular crystals are emerging as a promising platform for quantum information applications, combining long optical coherence times with the chemical tunability of coordination chemistry. Here we present a comprehensive optical characterisation of twelve Eu3+-based molecular complexes, with a focus on the coherent 5D0 ⟶ 7F0 transition at ∼580 nm. Judd-Ofelt analyses are performed across all complexes, providing insights into ligand-field environments, local point-group symmetries, and the resulting branching ratios of the coherent transition. We find that lower point-group symmetry (C1, C2) yields higher branching ratios of the 5D0 ⟶ 7F0 transition, exceeding 1\% in several complexes. Optical inhomogeneous linewidths measured at 4.2 K reveal narrow linewidths for some complexes of below ten GHz, indicative of a highly ordered crystalline environment. Optical coherence measurements of one of the complexes, 5-Eu, yields an optical coherence time of T2opt = 2.3 μs at 4.2 K, comparable to the best-performing molecular systems reported to date. Systematic characterisation and quantitative comparison will be key to find structure-property relations guiding rational design of optimised complexes for quantum information applications.
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BibTeX
@misc{jobbitt2026juddofelt,
title = {{Judd-Ofelt analysis and coherent spectroscopy of europium-based molecular complexes for quantum information applications}},
author = {Nicholas Lester Jobbitt and Sascha Weis and Timo Schweizer and Vishnu Unni Chorakkunnath and Evgenij Vasilenko and Tobias Haas and Barbora Brachnakova and Senthil Kumar Kuppusamy and Hartmut Schubert and Mario Ruben and Michael Seitz and David Hunger},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2610.13664},
eprint = {2610.13664},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2610.13664},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - Judd-Ofelt analysis and coherent spectroscopy of europium-based molecular complexes for quantum information applications
AU - Nicholas Lester Jobbitt
AU - Sascha Weis
AU - Timo Schweizer
AU - Vishnu Unni Chorakkunnath
AU - Evgenij Vasilenko
AU - Tobias Haas
AU - Barbora Brachnakova
AU - Senthil Kumar Kuppusamy
AU - Hartmut Schubert
AU - Mario Ruben
AU - Michael Seitz
AU - David Hunger
PY - 2026
DA - 2026/10/09
PB - arXiv
DO - 10.48550/arxiv.2610.13664
UR - https://arxiv.org/abs/2610.13664
AB - Rare-earth-ion based molecular crystals are emerging as a promising platform for quantum information applications, combining long optical coherence times with the chemical tunability of coordination chemistry. Here we present a comprehensive optical characterisation of twelve Eu^3+-based molecular complexes, with a focus on the coherent ^5D_0 ⟶ ^7F_0 transition at ∼580 nm. Judd-Ofelt analyses are performed across all complexes, providing insights into ligand-field environments, local point-group symmetries, and the resulting branching ratios of the coherent transition. We find that lower point-group symmetry (C_1, C_2) yields higher branching ratios of the ^5D_0 ⟶ ^7F_0 transition, exceeding 1\% in several complexes. Optical inhomogeneous linewidths measured at 4.2 K reveal narrow linewidths for some complexes of below ten GHz, indicative of a highly ordered crystalline environment. Optical coherence measurements of one of the complexes, 5-Eu, yields an optical coherence time of T_2^opt = 2.3 μs at 4.2 K, comparable to the best-performing molecular systems reported to date. Systematic characterisation and quantitative comparison will be key to find structure-property relations guiding rational design of optimised complexes for quantum information applications.
ER -