Mainz 2026 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 73: Quantum Technologies – Solid State Systems

Q 73.7: Talk

Friday, March 6, 2026, 12:45–13:00, P 7

Optically detected nuclear magnetic resonance of coherent spins in a molecular complex — •Vishnu Unni Chorakkunnath, Evgenij Vasilenko, Preethika Thiraviam, Nicholas Jobbitt, Barbora Brachnakova, Senthil Kuppusamy, Mario Ruben, and David Hunger — Karlsruher Institut für Technologie, Karlsruhe, Germany

A europium-based molecular complex has recently shown [1] competitive optical coherence time, surpassing those of europium-doped solid-state nanocrystals. Molecular complexes offer the possibility of tailoring ligand fields to improve and control optical and spin properties to realize optically addressable spin qubits. We report the first optically detected nuclear magnetic resonance (ODNMR) in a molecular complex. We observe nuclear Rabi-oscillations and spin coherence times (T2) of ~600*s in a single-crystal sample of the molecular complex at 4.2K. The spin coherence is extended up to 2ms with dynamical decoupling. Furthermore, we report strong nuclear and optical transition frequency correlation [2]. The self-assembly of molecular complexes into high-quality crystals improves optical and spin properties. Such crystals can be integrated into fibre-based microcavities [3] to enhance emission rates by the Purcell effect. These results are important steps towards single Eu3+ ion experiments to realize optically addressable spin qubits.

[1] Serrano et al., Nature, 603, 241-246 (2022)

[2] Vasilenko et al., arXiv:2509.01467 (2025)

[3] Eichhorn et al., Nanophotonics 14, 1817 (2025)

Keywords: Quantum information; optical detection of nuclear magnetic resonaces; micro-cavities