Preparing photon pairs entangled in any desired spatial modes via interference
Enrique J. Galvez · Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE · 2011
This article presents a proposal for producing photon pairs in states that are entangled in their spatial modes. The method sends collinear pairs of photons to an unbalanced interferometer with diffractive optical elements, and uses coherence and timing discrimination to create entangled states.