Comment on "Role of Initial Entanglement and Non-Gaussianity in the   Docoherence of Photon-Number Entangled States Evolving in a Noisy Channel"
  A discussion on the robustness of continuous-variable entangled states under noisy environment is briefly given in direct relation to Phys. Rev. Lett. 105, 100503 (2010). 
Jaehak Lee, M. S. Kim, and Hyunchul Nha
quant-ph