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Collectively Enhanced Interactions in Solid-state Spin Qubits
We proposed and analyzed 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. In our study, we demonstrated the emergence of a single collective delocalized eigenmode as one turned on a transverse field. The interaction strength between that symmetric collective mode and a remote spin qubit was enhanced by the square root of the number of spins that participated in the delocalized mode. Mediated by such collective enhancement, long-range quantum logic between remote spin registers could occur at distances consistence with optical addressing. A specific implementation that utilized nitrogen-vacancy defects in diamond was discussed and the effects of decoherence were considered.