Abstract
Recently, Jafarizadeh et al. [Eur. Phys. J. D 47, 283 (2008)] has constructed several two-qutrit entanglement witnesses based on the Gell-Mann matrices by using the linear programming method, moreover they claimed that all W 2 given by equation (16) are entanglement witnesses. In this comment, we would like to point out that there exit some W 2 given by equation (16) are not entanglement witnesses in general.
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M.A. Jafarizadeh, Y. Akbari, N. Behzadi, Eur. Phys. J. D 47, 283 (2008)
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Chang, DW. Comment on: Two-qutrit entanglement witnesses and Gell-Mann matrices. Eur. Phys. J. D 67, 222 (2013). https://doi.org/10.1140/epjd/e2013-40328-6
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DOI: https://doi.org/10.1140/epjd/e2013-40328-6