@article{BrandaoEisertHorodeckietal.2011,
  author    = {F. G. S. L. Brandao and Jens Eisert and M. Horodecki and Dong Yang},
  title     = {Entangled inputs cannot make imperfect quantum channels perfect},
  journal   = {Physical review letters},
  volume    = {106},
  number    = {23},
  doi       = {10.1103/PhysRevLett.106.230502},
  year      = {2011},
}