Non-Holonomic Control I
  In this paper, we present a universal control technique, the non-holonomic control, which allows us to impose any arbitrarily prescribed unitary evolution to any quantum system through the alternate application of two well-chosen perturbations. 
E. Brion, V.M. Akulin, D. Comparat, I. Dumer, V. Gershkovich, G.   Harel, G. Kurizki, I. Mazets and P. Pillet