  The numerical conditions to generate a high-fidelity Yurke-Stoler states
($|\alpha>+ e^{i \psi} |-\alpha>$)were found for two cascade-placed beam
splitters with one squeezed state input and two coherent state inputs.
Controlling the amplitude and the phases of beams, allows for various
Yurke-Stoler states to be manipulated with ultra high-fidelity, and the
expected theoretical fidelity is of more than 0.9999.
