2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/90533We analyze optical binary communication assisted by entanglement and show that: i) ideal entangled channels have smaller error probability than ideal single-mode coherent channels if the photon number of the channel is larger than one; ii) realistic entangled channels with heterodyne receivers have smaller error probability than ideal single-mode coherent channels if the photon number of the channel is larger than a threshold of about five photons.Contribution to QCMC 2002Quantum Physicstext