Morphing quantum erasure effect based on the vectorially structured photon

Whether a photon exhibits wavelike or particlelike behavior depends on the observation method, as clearly demonstrated by the quantum erasure (QE) experiments. Here, we propose a novel, to the best of our knowledge, version of the QE experiment that leverages a single photon prepared in an arbitrary polarization superposition state. Unlike traditional approaches that have a definite erasure method, the erasure in our experiment is determined intrinsically by the photon's quantum state at the moment of measurement. Furthermore, we observe continuous morphing between wave and particle behavior, enabled by continuous path information erasure in the photon's transverse mode. This dynamic transition challenges the classical dichotomy of waves and particles. These findings provide deeper insight into Bohr's complementarity principle and expand the conceptual framework of quantum mechanics.