  We study the entanglement of entangled coherent states in vacuum environment
by employing the entanglement of formation and propose a scheme to
probabilistically teleport a coherent superposition state via entangled
coherent states, in which the amount of classical information sent by Alice is
restricted to one bit. The influence of decoherence due to photon absorpation
is considered. It is shown that decoherence can improve the mean fidelity of
probabilistic teleportation in some situations.
