306 citations · 1.7k across the 29 of their papers we have counts for
4 papers · 1 filter
Maximally discordant separable two qubit states
Swapan Rana, Preeti Parashar
In a recent article S. Gharibian [\href{http://dx.doi.org/10.1103/PhysRevA.86.042106}{Phys. Rev. A {\bf 86}, 042106 (2012)}] has conjectured that no two qubit separable state of ra…
Comment on "Sudden change in quantum discord accompanying the transition from bound to free entanglement"
Swapan Rana, Preeti Parashar
In a recent article [http://dx.doi.org/10.1103/PhysRevA.87.022340, Phys. Rev. A 87, 022340 (2013)], Yan et al have studied geometric discord for a well known class of bound entangl…
Negative eigenvalues of partial transposition of arbitrary bipartite states
Swapan Rana
The partial transposition of a two-qubit state has at most one negative eigenvalue and all the eigenvalues lie in [-1/2,1]. In this Brief Report, we extend this result by Sanpera e…
Comment on "Witnessed entanglement and the geometric measure of quantum discord"
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 s…