Metal–ligand covalency enables observation of coherent spin dynamics to room temperature in a series of vanadium(iv) and copper(ii) catechol complexes.
The
realization of quantum information processing would disrupt
the status quo in the realm of computation; the extraordinary power
of a hypothetical quantum computer motivates significant research
efforts toward creating such a device. One promising route to enable
quantum information processing involves employing electronic spins
as the elementary unit of information, known as a qubit. Within this
paradigm, paramagnetic defect sites in solid-state materials demonstrate
appreciable promise, and recent developments in paramagnetic molecular
coordination complexes illustrate an encouraging trajectory. While
solid-state systems exhibit long spin coherence lifetimes, rational
control of their properties remains challenging. Effecting synthetic
control over qubit design prompted the study of tunable molecular
species to develop design principles for spin coherence lifetimes.
The challenge now lies in extending those molecular design principles
to target new solid-state architectures that could enable device-scale
systems. In this perspective, we detail recent progress in the rational
design of molecular qubit complexes and highlight the advances that
will be necessary in order to apply that progress to solid-state systems.
We further examine the impact that the lessons learned from the study
of qubits can have in the related fields of magnetic resonance imaging
and biological sensing.
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