|Quantum information processing using localized ensembles of nuclear spins
|Year of Publication
|Taylor, JM, Giedke, G, Christ, H, Paredes, B, Cirac, JI, Zoller, P, Lukin, MD, Imamoglu, A
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.