Abstract
In this comment, it is shown that the scheme recently proposed by Zhou et al. [Int. J. Theor. Phys. 58, 150 (2019)] for bidirectional quantum teleportation of two-qubit entangled state by using four-qubit cluster state is incorrect and in their proposed scheme, a four-qubit cluster state cannot be used as a quantum channel for successful realization of bidirectional quantum teleportation.
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