Limit quantum efficiency for violation of Clauser-Horne Inequality for   qutrits
  In this paper we present the results of numerical calculations about the minimal value of detection efficiency for violating the Clauser - Horne inequality for qutrits. Our results show how the use of non-maximally entangled states largely improves this limit respect to maximally entangled ones. A stronger resistance to noise is also found. 
Marco Genovese