2026-04-13T05:44:41Zhttps://recercat.cat/oai/request

oai:recercat.cat:2445/2233292025-12-04T21:45:04Zcom_2072_1057col_2072_478917col_2072_478933

00925njm 22002777a 4500 dc Swain, Abinash author Barrios Moreno, Leoní Alejandra author Nelyubina, Yulia author Teat, Simon J. author Roubeau, Olivier author Novikov, Valentin author Aromí Bedmar, Guillem author 2025-09-22T15:27:18Z 2025-09-22T15:27:18Z 2025-09-01 2025-09-22T15:27:18Z Spins within molecules benefit from the atomistic control of synthetic chemistry for the realization of qubits. One advantage is that the quantum superpositions of the spin states encoding the qubit can be coherently manipulated using electromagnetic radiation. The main challenge is the fragility of these superpositions when qubits are to partake of solid-state devices. We address this issue with a supramolecular approach for protecting molecular spin qubits against decoherence. The molecular qubit [Cr(ox)3]3− has been encapsulated inside the diamagnetic triple-stranded helicate [Zn2L3]4+ (L is a bis-pyrazolylpyridine ligand). The quantum coherence of the protected qubit is then analyzed with pulsed EPR spectroscopy and compared with the unprotected qubit, both in solution and in the solid state. Crucially, the spin–spin relaxation in the solid state has been examined within diamagnetic crystal lattices of the isostructural ([Al(ox)3]@[Zn2L3])+ or [Al(ox)3]3- assemblies, respectively, doped with the Cr3+ qubit in two different (<10%) concentrations. The study unveils a surprising increase of the phase memory time of the qubit upon encapsulation only in the solid. Spin-lattice relaxation times also exhibit a significant enhancement, as established from inversion recovery pulse sequences and from slow relaxation of the magnetization of the protected qubit, not featured by the free qubit. Estructura molecular Ordinadors quàntics Química supramolecular Molecular structure Quantum computers Supramolecular chemistry Encapsulation Enhances the Quantum Coherence of a Solid‐State Molecular Spin Qubit