Abstract By using the formalism of photon creation operators, we present the simplest description of the effect of quantum teleportation and describe its closest classical analog.
Recently published optical experiments which investigate the effect of “quantum teleportation” are analyzed. It is shown that the occurrence of teleportation (copying) of the polarization of one photon onto another requires that an optical shutter be added to the experimental setup, opening automatically only upon the occurrence of certain favorable events. An instructive model is proposed, along with a classical analog of the effect, and various treatments are discussed. It is emphasized that the concepts of “reduction of the wave function” and “quantum nonlocality” are not necessary for a quantitative description of the effect: the standard formalism proves to be sufficient.
The correlated motion of an N-spin system has been described in terms of the coherent states of a harmonic oscillator. We have shown that this description of the system provides us with the closest analog to the classical limit. The macroscopic dipole operator in the coherent-state representation is shown to obey the Bloch equation in which each of the three components is simultaneously well defined.
We consider the teleportation of displaced Fock states which are highly non-classical states of the quantized electromagnetic field which have a set of remarkable quantum properties that include the peculiar oscillations of their photon number distributions. We use the transfer operator formalism to show that the quantum teleportation of a DFS renders a finite superposition of orthonormal DFS's and find its explicit mathematical expression in terms of the compression parameter of the correlated EPR states of the quantum channel. The expression for a teleported Fock state is also derived as a particular case of DFS's teleportation. We finally apply these results to study the fidelity of the teleportation of DFS's and the teleportation of their photon number statistics.