Controlling qubit arrays with anisotropic XXZ Heisenberg interaction by acting on a single qubit R. Heule, C. Bruder, D. Burgarth and V.M. Stojanović Eur. Phys. J. D, 63 1 (2011) 41-46 Published online: 14 January 2011 DOI: 10.1140/epjd/e2010-10623-y