Exposedness of Choi-Type Entanglement Witnesses and Applications to Lengths of Separable States
Kil-Chan Ha, Seung-Hyeok Kye · Open Systems & Information Dynamics · 2013
We present a large class of indecomposable exposed positive linear maps between 3 × 3 matrix algebras. We also construct two-qutrit separable states with lengths ten in the interior of their dual faces. With these examples, we show that the length of a separable state may decrease strictly when we mix it with another separable state.