@misc{W2273682834,
  author = {Stefano Pirandola and Riccardo Laurenza and Carlo Ottaviani and Leonardo Banchi},
  title = {Fundamental limits of repeaterless quantum communications},
  year = {2017},
  howpublished = {Nature Communications},
  doi = {https://doi.org/10.1038/ncomms15043}
}