2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/217129This paper reports a "delayed choice quantum eraser" experiment proposed by Scully and Drühl in 1982. The experimental results demonstrated the possibility of simultaneously observing both particle-like and wave-like behavior of a quantum via quantum entanglement. The which-path or both-path information of a quantum can be erased or marked by its entangled twin even after the registration of the quantum.twocolumn, 4pages, submitted to PRLQuantum Physicstext