  We investigate an experimentally feasible scheme for amplification of
superpositions of coherent states (SCSs) in light fields. This scheme mixes two
input SCSs at a 50:50 beam splitter and performs post-selection by a homodyne
detection on one output mode. The key idea is to use two different types of
SCSs with opposite parities for input states, which results in an amplified
output SCS with a nearly perfect fidelity.
