Researchers Reveal Rich 48-Dimensional Topology Inside Entangled Photons

Researchers at the University of the Witwatersrand and collaborators demonstrated that entangled photons carry a hidden, high-dimensional topology—up to 48 dimensions—with over 17,000 distinct signatures. This topology arises from a single property of light, its orbital angular momentum, enabling a new high-dimensional encoding scheme for quantum information. Because OAM spans many values, the resulting topology can be very rich, and the effect can be observed using standard SPDC lab setups, potentially improving the robustness of future quantum technologies.