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• W2016990905 abstract "We introduce a family of separability criteria that are based on the existence of extensions of a bipartite quantum state ensuremath{rho} to a larger number of parties satisfying certain symmetry properties. It can be easily shown that all separable states have the required extensions, so the nonexistence of such an extension for a particular state implies that the state is entangled. One of the main advantages of this approach is that searching for the extension can be cast as a convex optimization problem known as a semidefinite program. Whenever an extension does not exist, the dual optimization constructs an explicit entanglement witness for the particular state. These separability tests can be ordered in a hierarchical structure whose first step corresponds to the well-known positive partial transpose (Peres-Horodecki) criterion, and each test in the hierarchy is at least as powerful as the preceding one. This hierarchy is complete, in the sense that any entangled state is guaranteed to fail a test at some finite point in the hierarchy, thus showing it is entangled. The entanglement witnesses corresponding to each step of the hierarchy have well-defined and very interesting algebraic properties that, in turn, allow for a characterization of the interior of the set of positive maps. Coupled with some recent results on the computational complexity of the separability problem, which has been shown to be NP hard, this hierarchy of tests gives a complete and also computationally and theoretically appealing characterization of mixed bipartite entangled states." @default.
• W2016990905 created "2016-06-24" @default.
• W2016990905 creator A5031935416 @default.
• W2016990905 creator A5054568644 @default.
• W2016990905 creator A5090447046 @default.
• W2016990905 date "2004-02-18" @default.
• W2016990905 modified "2023-10-16" @default.
• W2016990905 title "Complete family of separability criteria" @default.
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• W2016990905 doi "https://doi.org/10.1103/physreva.69.022308" @default.
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