|Title||Best separable approximation of multipartite diagonal symmetric states|
|Publication Type||Journal Article|
|Year of Publication||2014|
|Authors||Quesada, R, Sanpera, A|
|Journal||Physical Review A|
The structural study of entanglement in multipartite systems is hindered by the lack of necessary and sufficient operational criteria able to discriminate among the various entanglement properties of a given mixed state. Here, we pursue a different route to the study of multipartite entanglement based on the closeness of a multipartite state to the set of separable ones. In particular, we analyze multipartite diagonal symmetric N-qubit states and provide the analytical expression for their best separable approximation (BSA, [Phys. Rev. Lett. 80, 2261 (1998)]), that is, their unique convex decomposition into a separable part and an entangled part, with maximal weight of the separable part.
|Short Title||Phys. Rev. A|