We study quantum teleportation with the resource of non-orthogonal qubitstates. We first extend the standard teleportation protocol to the case of suchstates. We investigate how the loss of teleportation fidelity resulting for theuse of non-orthogonal states compares to a similar loss of fidelity when noisyor non-maximally entangled states as used as teleportation resource. Ouranalysis leads to certain interesting results on the teleportation efficiencyof both pure and mixed non-orthgonal states compared to that of non-maximallyentangled and mixed states.
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