2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/127398We show that when coherent-state encoding is employed in conjunction with coherent detection, the Bosonic broadcast channel is equivalent to a classical degraded Gaussian broadcast channel whose capacity region is dual to that of the classical Gaussian multiple-access channel. We further show that if a minimum output-entropy conjecture holds true, then the ultimate classical information capacity of the Bosonic broadcast channel can be achieved by a coherent-state encoding. We provide some evidence in support of the conjecture.5 pages, 4 figures, to appear in Proceedings of ISIT 2007Quantum Physicstext