Bonn 2025 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 75: Quantum Technologies (Solid State Systems) (joint session Q/QI)
Q 75.5: Talk
Friday, March 14, 2025, 15:30–15:45, HS I
Spectroscopy and coherent manipulation of REI-based organic molecular systems for quantum information applications. — •Vishnu Unni C.1, Evgenij Vasilenko1, Nicholas Jobbitt1, Xiaoyu Yang1, Barbora Brachnakova1, Senthil Kuppusamy1, Timo Neumann2, Mario Ruben1, Michael Seitz2, and David Hunger1 — 1Karlsruher Institut für Technologie, Karlsruhe, Germany — 2University of Tübingen, Tübingen, Germany
A europium-based molecular complex has recently shown [1] competing optical coherence time as that of europium-doped crystals. This opens the possibility of tailoring ligand fields to improve optical and spin properties to realize optically addressed spin qubits. We measure an improved photon echo coherence time of 3 µs at 4K, a narrow optical linewidth of 120 kHz, and a spin lifetime longer than an hour at 150 mK using spectral hole burning (SHB) in the complex reported in [1]. We measure spin inhomogeneous lines of the hyperfine transitions of the ground states. Simultaneously, we screen many organic complexes with improved branching ratios of up to 1.3% and characterize their hyperfine splittings of ground and excited states and optical coherence times. The self-assembly of molecular complexes into high-quality crystals is exploited to integrate them into fiber-based microcavities[2] which enhances emission rates by the Purcell effect. These results are important steps towards single ion experiments to realize optically addressable spin qubits.
[1] Serrano et al., Nature, 603, 241-246 (2022)
[2] Hunger et al., New J. Phys 12, 065038 (2010)
Keywords: Rare earth ions; quantum information; Cryogenic ensemble spectroscopy; Molecular complexes; Fiber-based microcavities