Mainz 2026 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 29: Poster – Quantum Technologies I
Q 29.34: Poster
Dienstag, 3. März 2026, 17:00–19:00, Philo 2. OG
Long optical and spin coherence of europium-based organic molecular qubits for quantum information applications — •Preethika Thiraviam1, Vishnu Unni C.1, Evgenij Vasilenko1, Nicholas Jobbitt1, Barbora Brachnakova1, Senthil Kuppusamy1, Timo Neumann2, Mario Ruben1, Michael Seitz2, and David Hunger1 — 1Karlsruher Institut für Technologie, Karlsruhe, Germany — 2University of Tübingen, Tübingen, Germany
Rare-earth doped solid-state materials offer long spin coherence and high-resolution optical transitions, positioning them as building blocks for scalable quantum technologies. Recent success in cavity integration highlights the growing viability in this approach [1]. Building on the results of [2], we investigate different molecular complexes to optimize optical and spin properties toward realizing an optically addressable spin qubit [3]. The increased branching ratio observed in our characterized complexes provide design guidelines for ligand-field engineering. Moreover, we demonstrate ion-ion interactions in both mono- and bi-nuclear complexes, opening a route to deterministic two-qubit quantum gates. Finally, we report first steps toward integrating molecular crystals in a fiber-based microcavity to enhance light-matter interactions [4] aiming to address single ions to implement high fidelity single and two-qubit gates.
[1] Ulanowski et al., PRX Quantum 6, (2025) [2] Serrano et al., Nature, 603, 241-246 (2022) [3] Vasilenko et al., arXiv:2509.01467 (2025) [4] Eichhorn et al., Nanophotonics,14, 1817 (2025)
Keywords: Fiber-based microcavity; Light-matter interactions; Rare-earth; Quantum technologies; Spin qubit