1211.5675 (Kil-Chan Ha et al.)

Exposedness of Choi type entanglement witnesses and applications to
lengths of separable states    [PDF]

Kil-Chan Ha, Seung-Hyeok Kye

We show that the entanglement witnesses considered in the paper (arXiv:1205.2921) are exposed. Bi-qutrit separable states in the interior of their dual faces have the length ten. These states have an interesting property: Adding a separable state, the length decreases strictly.

View original: http://arxiv.org/abs/1211.5675