Conjugated Porphyrin Tapes as Quantum Mediators for Vanadyl Qubits

• DOI: 10.26434/chemrxiv-2022-1v5b4
• Publication Date: 2022-08-19T11:43:21Z
• Authors: Iago Pozo; Federico Lombardi; Dimitris Alexandr...; Fanmiao Kong; Jie-Ren Deng; Peter Horton; Simon Coles; William Myers; Lapo Bogani; Harry Anderson

Vanadium(IV) magnetic centers are prime candidates as molecular quantum information units. One of the longstanding problems is to obtain an extendable scaffold that transmits interaction a degree usable for processing, and allows upscaling multiple centers, while preserving sufficiently long coherence time. Here, we show fused porphyrins allow tailored scaffolding vanadyl units, with almost flat conjugated π-system offers substantial advantages communication between ions, leading spin-lattice (T1 = 30 ms) (Tm 5.5 µs) times. The antiferromagnetic exchange coupling in these dimers (J 1 GHz) stronger than hyperfine interaction, resulting complex EPR spectra which both unpaired electrons couple equally I 7/2 51V nuclei. Isolation syn- anti-isomers, vanadyls on same or opposite sides con-jugated channel, showcases sensitivity units different configurational environments, way tune inter-action poly-porphyrin systems by controlling stereochemistry.