Comment on Quantum teleportation via GHZ-like state

TL;DR

This paper critiques and corrects previous errors in a quantum teleportation scheme using GHZ-like states, clarifying the validity of the method and its relation to similar schemes.

Contribution

It identifies and corrects calculation errors in prior work on quantum teleportation with GHZ-like states, confirming the broader applicability of the quantum channel.

Findings

Errors in previous calculations were corrected.

The teleportation scheme's validity was reaffirmed.

Related schemes use the same family of quantum channels.

Abstract

Recently Yang et al. [Int. J. Theo. Phys. 48 (2009) 516] have shown that an unknown qubit can be teleported by using a particular GHZ-like state as quantum channel. However, there are several errors in the calculation which lead to incorrect conclusions. The errors have been indicated and corrected. It is also noted that their scheme and the independently proposed teleportation scheme of Zhang et al. [Int. J. Theo. Phys. 48 (2009) 3331] uses quantum channel from the same family and any state of that family may be used for teleportation.