%0 Journal Article %D 2004 %T Quantum information processing using localized ensembles of nuclear spins %A J. M. Taylor %A G. Giedke %A H. Christ %A B. Paredes %A J. I. Cirac %A P. Zoller %A M. D. Lukin %A A. Imamoglu %X We describe a technique for quantum information processing based on localized en sembles of nuclear spins. A qubit is identified as the presence or absence of a collective excitation of a mesoscopic ensemble of nuclear spins surrounding a single quantum dot. All single and two-qubit operations can be effected using hyperfine interactions and single-electron spin rotations, hence the proposed scheme avoids gate errors arising from entanglement between spin and orbital degrees of freedom. Ultra-long coherence times of nuclear spins suggest that this scheme could be particularly well suited for applications where long lived memory is essential. %8 2004/07/23 %G eng %U http://arxiv.org/abs/cond-mat/0407640v2