Comment on "Single-mode excited entangled coherent states"

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Yuan, Hong-chun
Hu, Li-yun
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In Xu and Kuang (\textit{J. Phys. A: Math. Gen.} 39 (2006) L191), the authors claim that, for single-mode excited entangled coherent states $| \Psi_{\pm}(\alpha,m)>$, \textquotedblleft the photon excitations lead to the decrease of the concurrence in the strong field regime of $| \alpha | ^{2}$ and the concurrence tends to zero when $| \alpha | ^{2}\to \infty$". This is wrong.
Comment: 4 apges, 2 figures, submitted to JPA 15 April 2009
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Quantum Physics
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