We propose an interferometric method to investigate the non-locality of high-dimensional two-photon orbital angular momentum states generated by spontaneous parametric down conversion. We incorporate two half-integer spiral phase plates and a variable-reflectivity output beam splitter into a Mach-Zehnder interferometer to build an orbital angular momentum analyzer. This setup enables testing the non-locality of high-dimensional two-photon states by repeated use of the Clauser-Horne inequality.
@article{arxiv.quant-ph/0503034,
title = {Unravelling Two-Photon High-Dimensional Entanglement},
author = {A. Aiello and S. S. R. Oemrawsingh and E. R. Eliel and J. P. Woerdman},
journal= {arXiv preprint arXiv:quant-ph/0503034},
year = {2007}
}