High fidelity state mapping performed in a V-type level structure via   stimulated Raman transition
  It is proved that a qubit encoded in excited states of a V-type quantum system cannot be perfectly transferred to the state of the cavity field mode using a single rectangular laser pulse. This obstacle can be overcome by using a two-stage protocol, in which the fidelity of a state-mapping operation can be increased to nearly one. 
Grzegorz Chimczak
quant-ph