Recently it has been argued that all presently performed continuous variable
quantum teleportation experiments could be explained using a local hidden
variable theory. In this paper we study a modification of the original protocol
which requires a fully quantum mechanical explanation even when coherent states
are teleported. Our calculations of the fidelity of teleportation using a
pair-coherent state under ideal conditions suggests that fidelity above the
required limit of 1/2 may be achievable in an experiment also.Comment: Based on talks at the QIP workshop in 6th Joint Conference on
Mathematics and Computer Science, Pecs, 12-15 July 2006; and Quantum 2006 -
Workshop ad memoriam Carlo Novero, Turin. v2: Added reference to give credit
to L. Vaidma
