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

S. M. Fei, X. H. Gao, X. H. Wang +2

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 conditi…