Canonical Form and Separability of PPT States in 2x2x2xN Composite Quantum Systems

Abstract

We give a canonical form of PPT states in ${\mathcal{C}}^2\otimes {\mathcal{C}}^2\otimes {\mathcal{C}}^2\otimes {\mathcal{C}}^N$ with rank=$N$. From this canonical form a necessary separable condition for these states is presented.

arXiv commentLatex, 8 pages