On multipartite invariant states I. Unitary symmetry
Dariusz Chruscinski, Andrzej Kossakowski
Abstract
We propose a natural generalization of bipartite Werner and isotropic states to multipartite systems consisting of an arbitrary even number of d-dimensional subsystems (qudits). These generalized states are invariant under the action of local unitary operations. We study basic properties of multipartite invariant states: separability criteria and multi-PPT conditions.
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