2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/208122We report a direct measurement of the Wigner function characterizing the quantum state of a light mode. The experimental scheme is based on the representation of the Wigner function as an expectation value of a displaced photon number parity operator. This allowed us to scan the phase space point-by-point, and obtain the complete Wigner function without using any numerical reconstruction algorithms.4 pages, REVTeXQuantum Physicstext