Canonical Form and Separability of PPT States in 2xMxN Composite Quantum Systems
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We investigate the canonical forms of positive partial transposition (PPT) density matrices in ${\cal C}^2 \otimes {\cal C}^M \otimes {\cal C}^N$ composite quantum systems with rank $N$. A general expression for these PPT states are explicitly obtained. From this canonical form a sufficient separability condition is presented.
11 pages, Latex
11 pages, Latex