par Schafer, Joachim 
;Karpov, Evgueni ;Garcia-Patron Sanchez, Raul ;Pilyavets, Oleg ;Cerf, Nicolas
Référence Physical review letters, 111, page (030503)
Publication Publié, 2013-07-16
;Karpov, Evgueni ;Garcia-Patron Sanchez, Raul ;Pilyavets, Oleg ;Cerf, Nicolas Référence Physical review letters, 111, page (030503)
Publication Publié, 2013-07-16
Article révisé par les pairs
| Résumé : | We prove the equivalence of an arbitrary single-mode Gaussian quantum channel and a newly defined fiducial channel preceded by a phase shift and followed by a Gaussian unitary operation. This equivalence implies that the energy-constrained classical capacity of any single-mode Gaussian channel can be calculated based on this fiducial channel, which is furthermore simply realizable with a beam splitter, two identical single-mode squeezers, and a two-mode squeezer. In a large domain of parameters, we also provide an analytical expression for the Gaussian classical capacity, exploiting its additivity, and prove that the classical capacity cannot exceed it by more than 1/ln2 bits. |
