Quantum Science Seminar #67 - Roberta Sessoli

Roberta Sessoli
University of Florence
Florence — Italy
Magnetic molecules in quantum nanoscience
Implementation of advanced Quantum Technologies might benefit from the remarkable quantum properties shown by molecular spin systems based on the coordination bond. The versatility of the molecular approach combined with rational design has recently boosted the operativity temperature of molecules acting as bits of memory, otherwise known as Single-Molecule Magnets, or the coherence time of molecular spin qubits. The richness and tunability of the spectrum of spin levels make them particularly suitable for quantum error correction, while spin-spin interaction can be tuned to realize quantum gates and quantum simulators. Molecules can also be processed to be deposited on surfaces, allowing the realization of hybrid nanostructures. However, the molecular approach also poses key challenges, requiring for instance to overcome limitations such as those induced by low energy vibrational modes typical of molecular lattices. This drawback can be in part overcome by chemical design. Achieving the control of a single molecule is also challenging, requiring to couple the electric field, which can be confined at the molecular scale, with the spin degrees of freedom of the molecule. Initialization of spin systems is also an issue because only at very low temperatures does the Zeeman interaction overcome the thermal energy. Learning from nature, we are proposing to exploit chirality, and in particular spin selectivity in electron transfer processes through chiral structures, as an alternative way to spin polarize molecular systems. An overview of our recent results will be provided.

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