@article{estimationoflowrankdensitymatrices,
  title = {Estimation of low rank density matrices: bounds in Schatten norms and other distances},
  author = {Dong Xia and Vladimir Koltchinskii},
  year = {2016},
  eprint = {1604.04600},
  archivePrefix = {arXiv},
  url = {http://arxiv.org/abs/1604.04600v1},
}