1301.1961 (Swapan Rana et al.)

Comment on "Witnessed entanglement and the geometric measure of quantum
discord"    [PDF]

Swapan Rana, Preeti Parashar

In a recent article [Phys. Rev. A 86, 024302 (2012)], the authors have derived some hierarchy relations between geometric discord and entanglement (measured by negativity and its square). We point out that these results are incorrect and give analytic counterexamples. We also discuss briefly the reason for such violations.

View original: http://arxiv.org/abs/1301.1961