Comment on "Quantum Teleportation of Eight-Qubit State via Six-Qubit Cluster State"

TL;DR

This comment critiques a recent quantum teleportation scheme, showing it uses excessive resources and can be simplified to standard two-qubit teleportation, highlighting a trend of overcomplicated proposals.

Contribution

It identifies unnecessary resource use in a recent scheme and clarifies a conceptual mistake, advocating for simpler, more efficient quantum teleportation methods.

Findings

The scheme can be reduced to using two Bell states.

A conceptual mistake in the original description was identified.

Overuse of quantum resources is common in recent proposals.

Abstract

Recently, Zhao et al., (Int. J. Theor. Phys. 57, 516-522 (2018)) have proposed a scheme for quantum teleportation of an eight-qubit quantum state using a six qubit cluster state. In this comment, it's shown that the quantum resource (multi-partite entangled state used as the quantum channel) used by Zhao et al., is excessively high and the task can be performed using any two Bell states as the task can be reduced to the teleportation of an arbitrary two qubit state. Further, a trivial conceptual mistake made by Zhao et al., in the description of the quantum channel has been pointed out. It's also mentioned that recently a trend of proposing teleportation schemes with excessively high quantum resources has been observed and the essence of this comment is applicable to all such proposals.