Inequalities detecting entanglement for arbitrary bipartite systems
  Based on the generators of $SU(n)$ we present inequalities for detecting quantum entanglement for $2 \otimes d$ and $M \otimes N$ systems. These inequalities provide a sufficient condition of entanglement for bipartite mixed states and give rise to an experimental way of entanglement detection. 
Hui Zhao, Shao-Ming Fei, Jiao Fan and Zhi-Xi Wang
quant-ph