  We present a scheme for achieving amplification of the displacement of the
mirror in optomechanical cavity using single-photon postselection where the
mirror is initially prepared in squeezed coherent state. The amplification
depends on the enhanced fluctuations of the squeezed coherent state, and it is
is caused by the noncommutativity of quantum mechanics relying on the squeezed
coherent state, which can not be explained by the standard weak measurement
[1,25].
