Single-Pulse Preparation of the Uniform Superpositional State used in   Quantum Algorithms
  We examine a single-pulse preparation of the uniform superpositional wave function, which includes all basis states, in a spin quantum computer. The effective energy spectrum and the errors generated by this pulse are studied in detail. We show that, in spite of the finite width of the energy spectrum bands, amplitude and phase errors can be made reasonably small. 
G.P.Berman, F.Borgonovi, F.M.Izrailev and V.I.Tsifrinovich