  Mixing the squeezed vacuum and coherent state in a beam-splitter generates
NOON states of the electromagnetic field, but with fidelity less than unity. In
this note it is shown that the output of the beam-splitter generates the NOON
states with unit fidelity if superposed coherent states are used instead of the
squeezed vacuum. Also, the post-selection probability of NOON states is shown
to be higher.
