Bound entanglement for continuous variables is a rare phenomenon

Details Bound entanglement for continuous variables is a rare phenomenon Bound entanglement for continuous variables is a rare phenomenon

2001-03-14

arxiv.org/abs/quant-ph/0103076v3

Physics

Quantum Physics

Essentially changed and improved, list of Authors extended, 9 pages, Revtex

Scientific paper

We discuss the notion of bound entanglement (BE) for continuous variables (CV). We show that the set of non--distillable states (NDS) for CV is nowhere dense in the set of all states, i.e., the states of infinite--dimensional bipartite systems are generically distillable. This automatically implies that the sets of separable states, entangled states with positive partial transpose, and bound entangled states are also nowhere dense in the set of all states. All these properties significantly distinguish quantum CV systems from the spin like ones. The aspects of the definition of BE for CV is also analysed, especially in context of Schmidt numbers theory. In particular the main result is generalised by means of arbitrary Schmidt number and single copy regime.

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