Quantum teleportation with entangled states given by beam splittings

Quantum teleportation is rigorously demonstrated with coherent entangled st ates given by beam splittings. The mathematical scheme of beam splitting ha s been used to study quantum communication [2] and quantum stochastic [8]. We discuss the teleportation process by means of coherent states in this sc heme for the following two cases: (1) Delete the vacuum part from coherent states, whose compensation provides us a perfect teleportation from Alice t o Bob. (2) Use fully realistic (physical) coherent states, which gives a no n-perfect teleportation but shows that it is exact when the average energy (density) of the coherent vectors goes to infinity. We show that our quantu m teleportation scheme with coherent entangled state is more stable than th at with the EPR pairs which was previously discussed.