par Pirandola, Stefano;Spedalieri, Gaetana;Braunstein, S. L.;Cerf, Nicolas 
;Lloyd, Seth
Référence Physical review letters, 13, 140405
Publication Publié, 2014-10-03
;Lloyd, SethRéférence Physical review letters, 13, 140405
Publication Publié, 2014-10-03
Article révisé par les pairs
| Résumé : | In this Letter we exploit the recently solved conjecture on the bosonic minimum output entropy to show the optimality of Gaussian discord, so that the computation of quantum discord for bipartite Gaussian states can be restricted to local Gaussian measurements. We prove such optimality for a large family of Gaussian states, including all two-mode squeezed thermal states, which are the most typical Gaussian states realized in experiments. Our family also includes other types of Gaussian states and spans their entire set in a suitable limit where they become Choi matrices of Gaussian channels. As a result, we completely characterize the quantum correlations possessed by some of the most important bosonic states in quantumoptics and quantum information. |
