  We show that a special type of entangled states, cluster states, can be
created with Heisenberg interactions and local rotations in 2d steps where d is
the dimension of the lattice. We find that, by tuning the coupling strengths,
anisotropic exchange interactions can also be employed to create cluster
states. Finally, we propose electron spins in quantum dots as a possible
realization of a one-way quantum computer based on cluster states.
