Engineering of Multi-Dimensional Entangled States of Photon Pairs Using Hyper-Entanglement
Xi‐Feng Ren, Guo‐Ping Guo, Jian Li, LI Chuan-feng, Guo Guang-Can · Chinese Physics Letters · 2006
Multi-dimensional entangled states have been proven to be more powerful in some quantum information processes. Down-converted photons from spontaneous parametric down-conversion are used to engineer multi-dimensional entangled states. A kind of multi-degree multi-dimensional Greenberger–Horne–Zeilinger states can also be generated. The hyper-entangled photons are entangled in energy-time, polarization and orbital angular momentum, which is proven to be useful to increase the dimension of systems and to investigate higher-dimensional entangled states.