Distillability and partial transposition in bipartite systems

W. Dür, J. I. Cirac, M. Lewenstein, D. Bruss

Published 1999-10-06Version 1

We study the distillability of a certain class of bipartite density operators which can be obtained via depolarization starting from an arbitrary one. Our results suggest that non-positivity of the partial transpose of a density operator is not a sufficient condition for distillability, when the dimension of both subsystems is higher than two.