Scheme for total quantum teleportation

We address the issue of totally teleporting the quantum stare of an externa l particle, as opposed to studies on partial teleportation of external sing le-panicle states, total teleportation of coherent states and encoded singl e-particle states, and intramolecular teleportation of nuclear spin states. We find a set of commuting observables whose measurement directly projects onto the Bell basis and discuss a possible experiment, based on two-photon absorption, allowing, for the first time, total teleportation of the state of a single external photon through a direct projective measurement.