Dresden 2026 – wissenschaftliches Programm
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QI: Fachverband Quanteninformation
QI 14: Quantum Information Poster Session
QI 14.21: Poster
Mittwoch, 11. März 2026, 18:00–21:00, P4
Characterization of spin-relaxation dynamics of rare earth ions in CaWO4 — •Sebastian Dominguez-Calderon1,2, Georg Mair1,2, Arjun Bhasker1,2, Robert Pant1,2, Hans Huebl1,2,3, and Nadezhda Kukharchyk1,2,3 — 1Walther-Meißner-Institut, Bayerische Akademie der Wissenschaften, D-85748 Garching, Germany — 2School of Natural Sciences, Technische Universität München, D-85748 Garching, Germany — 3Munich Center for Quantum Science and Technology, D-80799 Munich, Germany
Rare-earth spin ensembles doped into bulk crystals, such as CaWO4, are promising candidates for quantum memory devices operating at microwave frequencies and compatible to superconducting quantum technologies. To further improve this technology, it is of pivotal importance to understand the mechanisms which affect information lifetimes. In the present work, we investigate spin interactions in ensembles of rare-earth (RE) ions in CaWO4 via superconducting coplanar waveguides at millikelvin temperatures. Using spatially separated transmission lines, as well as pump-probe detection schemes, we aim to understand the ensemble’s spin diffusion, suspected to be dominated by spin-spin as well as spin-phonon interactions. Characterization of the diffusion will give insights into different relaxation channels for RE:CaWO4 that would aid the design of future quantum memory devices.
Keywords: spin ensemble; relaxation dynamics; rare-earth; quantum memory