Global entanglement and coherent states in an N-partite system
Department of Theoretical Physics, University of Szeged, 6720 Szeged, Hungary
Corresponding author: a firstname.lastname@example.org
Revised: 4 December 2008
Published online: 26 March 2009
We consider a quantum system consisting of N parts, each of which is a “quKit” described by a K dimensional Hilbert space. We prove that in the symmetric subspace, , a pure state is not globally entangled, if and only if it is a coherent state. It is also shown that in the orthogonal complement all states are globally entangled.
PACS: 03.65.Ud – Entanglement and quantum nonlocality
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2009