2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/93323Heterodyne, eight-port homodyne and six-port homodyne detectors belong to the class of two-photocurrent devices. Their full equivalence in probing radiation field has been proved both for ideal and not fully efficient photodetectors. The output probability distribution has been also evaluated for a generic probe mode.14 pages. ioppllt.sty (enclosed). 6 figs in LaTeX. Submitted to Quantum and Semiclassical OpticsQuantum Physicstext