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.
@article{arxiv.1210.3622,
title = {Collectively Enhanced Interactions in Solid-state Spin Qubits},
author = {Hendrik Weimer and Norman Y. Yao and Mikhail D. Lukin},
journal= {arXiv preprint arXiv:1210.3622},
year = {2013}
}