image: When the input is an entangled state that is antisymmetric, the output has photons in both ports. Orbital angular momentum carrying light has a twisted wavefront and can be entangled in high dimensions, so using this type of entanglement on the beamsplitter can prepare high-dimensional entangled states at the output. This material relates to a paper that appeared in the Feb. 26, 2016, issue of Science, published by AAAS. The paper, by Y. Zhang at the Council for Scientific and Industrial Research in Pretoria, South Africa, and colleagues was titled, "Engineering two-photon high-dimensional states through quantum interference." view more
Credit: University of the Witwatersrand