Generation of arbitrary quantum states of traveling fields
  We show that any single-mode quantum state can be generated from the vacuum by alternate application of the coherent displacement operator and the creation operator. We propose an experimental implementation of the scheme for traveling optical fields, which is based on field mixings and conditional measurements in a beam splitter array, and calculate the probability of state generation. 
M. Dakna, J. Clausen, L. Knoll and D.-G. Welsch