Dual-wavelength quantum skyrmions from liquid crystal topological defect

Abstract: We propose a spin-orbit strategy for generating dual-wavelength quantum skyrmions, realized either as entangled photon pairs at distinct wavelengths or as heralded single-photon states at a given wavelength -- regimes neither previously conceptualized nor demonstrated. By coupling a two-photon entangled state to an electrically tunable liquid crystal topological defect, we engineer both nonlocal and local skyrmionic topologies in a reconfigurable platform. These results open new directions for topological quantum state engineering and the topological richness of liquid crystals.