SAMOP 2023 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 42: Poster III

Q 42.26: Poster

Wednesday, March 8, 2023, 16:30–19:00, Empore Lichthof

Cryogenic ensemble spectroscopy of Europium molecular complexes — •Weizhe Li, Evgenij Vasilenko, Jannis Hessenauer, Senthil Kumar Kuppusamy, Mario Ruben, and David Hunger — Karlsruhe Institut für Technologie, Karlruhe, Germany

Rare Earth Ions (REI) doped into solid state crystals have long optical coherence time and even longer spin coherence time. This makes REI a promising candidate for spin qubits which are optically addressable. For integration into photonic structures, nano-scale materials are of particular interest. In Europium-doped nanocrystals (Eu³⁺:Y₂O₃), an optical coherence time of 3.7 µs and spin coherence time of 3 ms were obtained [1, 2, 3]. More recently, crystallized molecular complexes hosting REI have shown excellent optical coherence lifetimes of more than 10 µs and long spin population lifetimes [4], evidencing a quiet local environment.

This opens up a promising direction to explore further. In our research, we investigate different Eu³⁺-based molecules including the complex used in [4]. We perform cryogenic ensemble spectroscopy and spectral hole burning and consistently observe long-lived spin states and narrow homogeneous optical linewidths.

[1] J. Bartholomew et al. Nano letters 17.2(2017), pp. 778-787.

[2] A. Perrot et al. Physical review letters 111.20 (2013), p. 203601.

[3] D. Serrano et al. Nature communications 9.1 (2018), pp. 1-7.

[4] D. Serrano et al. Nature 603.7900 (2022), pp. 241-246.