TY - JOUR T1 - Nanoplasmonic Lattices for Ultracold atoms JF - Physical Review Letters Y1 - 2012 A1 - Michael Gullans A1 - T. Tiecke A1 - D. E. Chang A1 - J. Feist A1 - J. D. Thompson A1 - J. I. Cirac A1 - P. Zoller A1 - M. D. Lukin AB - We propose to use sub-wavelength confinement of light associated with the near field of plasmonic systems to create nanoscale optical lattices for ultracold atoms. Our approach combines the unique coherence properties of isolated atoms with the sub-wavelength manipulation and strong light-matter interaction associated with nano-plasmonic systems. It allows one to considerably increase the energy scales in the realization of Hubbard models and to engineer effective long-range interactions in coherent and dissipative many-body dynamics. Realistic imperfections and potential applications are discussed. VL - 109 UR - http://arxiv.org/abs/1208.6293v3 CP - 23 J1 - Phys. Rev. Lett. U5 - 10.1103/PhysRevLett.109.235309 ER - TY - JOUR T1 - Solid-state circuit for spin entanglement generation and purification JF - Physical Review Letters Y1 - 2005 A1 - J. M. Taylor A1 - W. Dür A1 - P. Zoller A1 - A. Yacoby A1 - C. M. Marcus A1 - M. D. Lukin AB - We show how realistic charge manipulation and measurement techniques, combined with the exchange interaction, allow for the robust generation and purification of four-particle spin entangled states in electrically controlled semiconductor quantum dots. The generated states are immunized to the dominant sources of noise via a dynamical decoherence-free subspace; all additional errors are corrected by a purification protocol. This approach may find application in quantum computation, communication, and metrology. VL - 94 UR - http://arxiv.org/abs/cond-mat/0503255v2 CP - 23 J1 - Phys. Rev. Lett. U5 - 10.1103/PhysRevLett.94.236803 ER - TY - JOUR T1 - Quantum information processing using localized ensembles of nuclear spins Y1 - 2004 A1 - J. M. Taylor A1 - G. Giedke A1 - H. Christ A1 - B. Paredes A1 - J. I. Cirac A1 - P. Zoller A1 - M. D. Lukin A1 - A. Imamoglu AB - 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. UR - http://arxiv.org/abs/cond-mat/0407640v2 ER -