Coerenza quantica in complessi molecolari paramagnetici per potenziali applicazioni in tecnologie basate sulla quantum information.

Implementation of modern Quantum Information Technologies might be performed through the adoption of different systems. Among them, molecular spin systems with S=1/2 electronic configuration, represent an interesting alternative thanks to the achievable control over the electronic structure and properties through synthesis. The present work is focused on the characterization of four molecular complexes featuring a doublet spin state (Cu(mpo)2, Cu(dttt)2, CpVcht and Ti(cot)L) based on Electron Paramagnetic Resonance (EPR) techniques. In particular, the electron spin coherence properties were investigated over a range of temperatures by studying the electronic relaxation times (T1 and Tm). Moreover, the structural features affecting the spin-dynamics were investigated by monitoring the hyperfine interaction by means of Hyperfine Sublevel Correlation (HYSCORE) spectroscopy experiments. Different factors affecting the quantum coherence time such as the presence of magnetically active nuclei, rigidity of the lattice and degree of covalency in the metal-ligand bond are discussed.