Entangling ions in arrays of microscopic traps
  We consider a system of particles in an array of microscopic traps, coupled to each other via electrostatic interaction, and pushed by an external state-dependent force. We show how to implement a two-qubit quantum gate between two such particles with a high fidelity. 
T. Calarco (1 and 2), J.I. Cirac (1), P. Zoller (1) ((1) Institut fuer   Theoretische Physik, Universitaet Innsbruck, Innsbr...