2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/89616We experimentally demonstrate that entanglement of bi-photon polarization state can be restored by spectral filters. This restoration procedure can be viewed as a new class of quantum eraser, which retrieves entanglement rather than just interference by manipulating an ancillary degree of freedom.4 pages, 4 figuresQuantum Physicstext