title: Classical capacity of the lossy bosonic channel: the exact solution.
abstract: The classical capacity of the lossy bosonic channel is calculated exactly. It is shown that its Holevo information is not superadditive, and that a coherent-state encoding achieves capacity. The capacity of far-field, free-space optical communications is given as an example.
authors.affiliation: Massachusetts Institute of Technology-Research Laboratory of Electronics, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139-4307, USA.
authors.forename: V
authors.initials: V
authors.lastname: Giovannetti
authors.forename: S
authors.initials: S
authors.lastname: Guha
authors.forename: S
authors.initials: S
authors.lastname: Lloyd
authors.forename: L
authors.initials: L
authors.lastname: Maccone
authors.forename: J H
authors.initials: JH
authors.lastname: Shapiro
authors.forename: H P
authors.initials: HP
authors.lastname: Yuen