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The experimental realization of multidimensional quantum states may lead tounexplored and interesting physics, as well as advanced quantum communicationprotocols. The orbital angular momentum of photons is a well suitable discretedegree of freedom for implementing high-dimensional quantum systems. Thestandard method to generate and manipulate such photon modes is to use bulk andfixed optics. Here the authors demonstrate the utilization of a spatial lightmodulator to manipulate the orbital angular momentum of entangled photonsgenerated in spontaneous parametric downconversion. They show that their setupallows them to realize photonic entanglement of up to 21 dimensions, which inprinciple can be extended to even larger dimensions.

How to create and detect N-dimensional entangled photons with an active phase hologram