Quantum

Comparative Optical Spectroscopy of Er$^{3+}$, Tm$^{3+}$, and Eu$^{3+}$ Molecular Complexes at Cryogenic Temperature

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Based on a feed excerpt; full article content has not been acquired. Source evidence retrieved 21/10/2026, 04:13:25 UTC.

Briefings

A 2026 arXiv preprint compares cryogenic optical properties of Er3+, Tm3+, and Eu3+ molecular complexes. Spectral hole burning was observed only in the Eu3+ complex, while Er3+ and Tm3+ showed no measurable hole. Laser-induced heating was detected in both Er3+ and Tm3+ powders, with Er3+ relaxation extending over tens of seconds. The authors conclude that heating alone cannot explain the contrast, suggesting ion-dependent relaxation and decoherence processes linked to electronic structure and phonon coupling.

Key points

• Spectral hole burning was observed exclusively in the Eu3+ complex, whereas no measurable hole was detected in the Er3+ and Tm3+ complexes.
• Laser-induced local heating was measured in both Er3+ and Tm3+ powder-like samples, with Er3+ relaxation times extending over tens of seconds.

Context

This study investigates rare-earth molecular complexes for quantum information applications by comparing cryogenic optical properties across three ions in a single ligand environment.

Limitations

The evidence is limited to a single arXiv preprint snapshot from October 2026. The study does not provide additional background context, nor does it include temperature-dependent linewidth or line-shift measurements mentioned in the abstract.

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