  We report the formation of a general superposition of coherent states in
exact analytical solution of the Schrodingers equatin for atom-photon
interaction by taking into account the role of virtual photons. Despite some
known superposition of quantum states, the general superposition state
introduced in this letter constructed without any nonlinear effect. The Yurke-
Stoler state and its special cases, the even and odd cat states, obtained as
some simple examples of the method. A general experimental setup is proposed to
realize a variety of superposition states.
