A note on generalized concurrences and entanglement detection

Details A note on generalized concurrences and entanglement detection A note on generalized concurrences and entanglement detection

2008-04-22

arxiv.org/abs/0804.3620v3

Physics

Quantum Physics

It replaces two previous versions. The new version incorporates important references on the topic. It corrects a mistake. Titl

Scientific paper

We study generalized concurrences as a tool to detect the entanglement of
bipartite quantum systems. By considering the case of 2 X 4 states of rank 2,
we prove that generalized concurrences do not, in general, give a necessary and
sufficient condition of separability. We identify a set of entangled states
which are undetected by this method.

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