arXiv:quant-ph/0501023
On PPT States in KxMxN Composite Quantum Systems
Xiaohong Wang, Shao-Ming Fei, Zhi‐Xi Wang, Ke Wu
Abstract
We study the general representations of positive partial transpose (PPT) states in ${\cal C}^K \otimes {\cal C}^M \otimes {\cal C}^N$. For the PPT states with rank-$N$ a canonical form is obtained, from which a sufficient separability condition is presented.