ABSTRACT: Quantum teleportation of optical coherent states was demonstrated
experimentally using squeezed-state entanglement. The quantum nature of
the achieved teleportation was verified by the experimentally determined
fidelity *F*^{exp} = 0.58 ± 0.02,
which describes the match between input and output states. A fidelity
greater than 0.5 is not possible for coherent states without the use of
entanglement. This is the first realization of unconditional quantum
teleportation where every state entering the device is actually teleported.