TY - JOUR
T1 - Best separable approximation of multipartite diagonal symmetric states
AU - Quesada, Ruben
AU - Sanpera, Anna
PY - 2014/5/15
Y1 - 2014/5/15
N2 - 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)PRLTAO0031-900710.1103/PhysRevLett.80.2261]), that is, their unique convex decomposition into a separable part and an entangled part, with maximal weight of the separable part. © 2014 American Physical Society.
AB - 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)PRLTAO0031-900710.1103/PhysRevLett.80.2261]), that is, their unique convex decomposition into a separable part and an entangled part, with maximal weight of the separable part. © 2014 American Physical Society.
U2 - 10.1103/PhysRevA.89.052319
DO - 10.1103/PhysRevA.89.052319
M3 - Article
SN - 1050-2947
VL - 89
JO - Physical Review A - Atomic, Molecular, and Optical Physics
JF - Physical Review A - Atomic, Molecular, and Optical Physics
M1 - 052319
ER -