  We propose and analyze a technique to collectively enhance interactions
between solid-state quantum registers composed from random networks of spin
qubits. In such systems, disordered dipolar interactions generically result in
localization. Here, we demonstrate the emergence of a single collective
delocalized eigenmode as one turns on a transverse magnetic field. The
interaction strength between this symmetric collective mode and a remote spin
qubit is enhanced by square root of the number of spins participating in the
delocalized mode. Mediated by such collective enhancement, long-range quantum
logic between remote spin registers can occur at distances consistent with
optical addressing. A specific implementation utilizing Nitrogen-Vacancy
defects in diamond is discussed and the effects of decoherence are considered.
