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 |
Volume | 89 |
Date Published | 5/2014 |
ISSN | 1094-1622 |
Abstract | 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. |
DOI | 10.1103/PhysRevA.89.052319 |
Short Title | Phys. Rev. A |
