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Information-theoretical Secret-key agreement and Bound informationFebruary 11th, 2009
It has been shown in [17] that positive eigenvalues of the partial transpose (PPT) of a state is a necessary condition for separability of a state. Moreover it is stated that in the cases ¢2×2 and ¢2×3 PPT is also a sufficient condition. This is illustrated in figure B.1 (a). But until now we do not have a useful tool for higher dimensional systems, i.e. ¢2×k with k > 3 and ¢i× j
