One parameter family of indecomposable optimal entanglement witnesses   arising from generalized Choi maps
  In the recent paper [Chru\'{s}ci\'{n}ski and Wudarski, arXiv:1105.4821], it was conjectured that the entanglement witnesses arising from some generalized Choi maps are optimal. We show that this conjecture is true. Furthermore, we show that they provide a one parameter family of indecomposable optimal entanglement witnesses. 
Kil-Chan Ha and Seung-Hyeok Kye
quant-ph math-ph math.MP