Light and electric field control of molecular spin qubits

Molecular spins exhibiting robust quantum coherence are a promising resource in quantum technologies. Their processability allows for deposition on surface and tuning of the molecule-surface interactions. The control of the spin at the level of the single molecular qubit requires going beyond the use of magnetic fields. Electric fields, on the contrary, can be confined at the level of the single molecule, but the mechanisms of spin-electric coupling in molecules are not widely explored, especially for materials where the orbital contribution is minimized to enhance coherence. Of particular relevance to the realization of quantum gates and scalable architec-tures is the possibility of electric-field tuning of qubit interactions. Equally relevant is the addition of an optical interface to the qubit. Recent achievements along these directions will be presented. They will include light-induced nuclear and electron spin polarization and light-activated qubit-qubit interaction in vanadyl-porphyrin systems.The key role of structural chirality in achieving spin control at the molecular scale will also be discussed. Challenges and opportunities in 4f chemistry will be discussed.

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