Purification and correlated measurements of bipartite mixed states

Details Purification and correlated measurements of bipartite mixed states Purification and correlated measurements of bipartite mixed states

2001-12-03

arxiv.org/abs/quant-ph/0112015v1

Physics

Quantum Physics

4 revtex pages, to appear in Phys. Rev. A

Scientific paper

10.1103/PhysRevA.65.034304

We prove that all purifications of a non-factorable state (i.e., the state
which cannot be expressed in a form $\rho_{AB}=\rho_A\otimes\rho_B$) are
entangled. We also show that for any bipartite state there exists a pair of
measurements which are correlated on this state if and only if the state is
non-factorable.

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