  In this work we showcase the potential of peptides as versatile scaffolds for
quantum computing and molecular spintronics. In particular, we focus on
lanthanide-binding tags, which were originally developed in the field of
biotechnology for the study of protein structure and dynamics. Firstly, we
demonstrate quantum coherent oscillations in a Neodymium peptidic qubit. Then,
employing bacterial biosynthesis, we investigate the possibility of increasing
the number of qubits in the same molecular system, with the case studies being
a double spin qubit with two distinct coordination environments, and an
asymmetric chain of 9 spin qubits with a spin-spin separation of about 2 nm and
in an arbitrarily chosen sequence of coordination environments. Finally, we
take advantage of biochemical modification for the preparation of paramagnetic,
chiral, Self-Assembled Monolayers (SAMs) on Au(111).Our experimental and
theoretical characterization shows that this is a promising structure for
spintronic applications, and in particular to improve on two state-of-the-art
approaches to molecular spin qubits. We conclude with an overview of the
challenges and new opportunities opened by this emerging field.
