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Entanglement criteria for all bipartite Gaussian states
G Giedke1, B Kraus, M Lewenstein
1Institut für Theoretische Physik, Universität Innsbruck, A-6020 Innsbruck, Austria.
Physical Review Letters
|November 3, 2001
Abstract:
We provide a necessary and sufficient condition for separability of Gaussian states of bipartite systems of arbitrarily many modes. The condition provides an operational criterion since it can be checked by simple computation. Moreover, it allows us to find a pure product-state decomposition of any given separable Gaussian state. We also show that all bipartite Gaussian states with nonpositive partial transpose are distillable.