title: Collectively enhanced interactions in solid-state spin qubits.
abstract: 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 the 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.
authors: Physics Department, Harvard University, 17 Oxford Street, Cambridge, Massachusetts 02138, USA. hweimer@cfa.harvard.edu
authors: Hendrik
authors: H
authors: Weimer
authors: Norman Y
authors: NY
authors: Yao
authors: Mikhail D
authors: MD
authors: Lukin