Biseparability of noisy pseudopure, W and GHZ states using conditional   quantum relative Tsallis entropy
  We employ the conditional version of sandwiched Tsallis relative entropy to determine 1:N-1 separability range in the noisy one-parameter families of pseudopure and Werner-like N-qubit W, GHZ states. The range of the noisy parameter, for which the conditional sandwiched Tsallis relative entropy is positive, reveals perfect agreement with the necessary and sufficient criteria for the separability in the 1:N-1 partition of these one parameter noisy states. 
Anantha S Nayak, Sudha, A.R. Usha Devi and A.K. Rajagopal
quant-ph