An efficient single-step scheme for manipulating quantum information of   two trapped ions beyond the Lamb-Dicke limit
  Based on the exact conditional quantum dynamics for a two-ion system, we propose an efficient {\it single-step} scheme for coherently manipulating quantum information of two trapped cold ions by using a pair of synchronous laser pulses. Neither the auxiliary atomic level nor the Lamb-Dicke approximation are needed. 
L.F. Wei and Franco Nori