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Q: Fachverband Quantenoptik und Photonik

Q 61: Quantum Optics (Miscellaneous)

Q 61.12: Poster

Thursday, March 17, 2022, 16:30–18:30, P

Coherent spectroscopy of Europium-doped materials — •Christina Ioannou¹, Jannis Hessenauer¹, Evgenij Vasilenko¹, Phillipe Goldener², Diana Serrano², Mario Ruben¹, Senthil Kuppusamy¹, and David Hunger¹ — ¹Karlsruhe Institute of Technology — ²Institut de Recherche de Chimie Paris

Solid state crystals doped with rare earth ions (REI) such as Europium have been demonstrated to be excellent candidates for optically addressable spin qubits. The coherence properties of REI within the partially filled 4f shell are exceptional due to their immunity against fluctuations of their environment as a result of the shielding effect of the outer filled electronic shells. Still, the host material affects the properties of the ions, such as the optical and spin coherence time. We use ensemble spectroscopy techniques such as spectral hole burning and photon echo techniques to investigate the optical coherence time of Europium in promising host materials. These techniques allow the measurement of the homogeneous linewidth of particular ion classes in spite of the significant inhomogeneous broadening of the ensemble. The host materials that we investigate are Y2SO3 nanocrystals and specifically designed molecular complexes [1]. Furthermore, we demonstrate our newly developed fiber based setup used for these measurements. This setup is compact and only needs very small amounts of sample. It is easily installed inside a cryostat, without the need of free-space optical access, while still maintaining good collection efficiency.

[1] Serrano et al., arXiv:2105.07081, in print at Nature