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We study the distillability of a certain class of bipartite density operatorswhich can be obtained via depolarization starting from an arbitrary one. Ourresults suggest that non-positivity of the partial transpose of a densityoperator is not a sufficient condition for distillability, when the dimensionof both subsystems is higher than two.Comment: 8 pages, 1 figur

Distillability and partial transposition in bipartite systems