A note on extremal states of composite quantum systems with fixed
marginals [PDF]
S. KanmaniAn extremal element of the convex set of composite quantum states in $M_2\otimes M_3$, whose marginals are all normalised identities has been constructed. It is found to be a mixed state and is entangled as well.View original: http://arxiv.org/abs/1304.5413
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