Comment on "Teleportation of Three-Qubit State via Six-qubit Cluster State"

Abstract

Recently Yu and Sun [Int. J. Theor. Phys. DOI 10.1007/s10773-014-2360-x] have presented probabilistic teleportation of 3-qubit cat state via 6-qubit cluster state. The success probability depends on absolute value of only two of the coefficients of cluster state i.e. |c|^2 + |d|^2. We have demonstrated the feasibility to teleport 3-qubit cat state via 2-qubit non maximally entangled Bell state instead of a complex state like 6-qubit non maximally entangled cluster state. In this comment we have prescribed an optimal protocol for teleportation of n-qubit state of the form (\alpha|x> + \beta|\bar{x}>)_n via non maximally entangled Bell state a|00> + b|11> henceforth allowing teleportation of n-qubit state via 2-qubit Bell state. The success probability of the prescribed protocol is |b|^2.