We consider a generalized quantum teleportation protocol for an unknown qubit
using non-maximally entangled state as a shared resource. Without recourse to
local filtering or entanglement concentration, using standard Bell-state
measurement and classical communication one cannot teleport the state with unit
fidelity and unit probability. We show that using non-maximally entangled
measurements one can teleport an unknown state with unit fidelity albeit with
reduced probability, hence probabilistic teleportation. We also give a
generalized protocol for entanglement swapping using non-maximally entangled
states.Comment: Latex file, 11 pages, No figure