Witness to detect quantum correlation of bipartite states in arbitrary   dimension
  In this work we introduce a nonlinear witness that is a sufficient condition for detecting the vanishment of quantum correlation of bipartite states. Our result directly generalizes the result of [J. Maziero, R. M. Serra, arXiv:1012.3075] to arbitrary dimension based on the Bloch representation of density matrices. 
Zhi-Hao Ma, Zhi-Hua Chen, Jing-Ling Chen
quant-ph