@Misc{ 
  GiaTreGio16b,
  author = { Giacomo De Palma,  and Giovannetti, Vittorio and Trevisan, Dario },
  title = { Gaussian States Minimize the Output Entropy of the One-Mode Quantum
  Attenuator },
  journal = {  },
  year = { 2016 },
  pages = {  },
  URL = { http://cvgmt.sns.it/paper/3482/ },
  note = { cvgmt preprint}
}