We present detailed instructions for constructing and operating an apparatus to produce and detect polarization-entangled photons. The source operates by type-I spontaneous parametric downconversion in a two-crystal geometry. Photons are detected in coincidence by single-photon counting modules and show strong angular and polarization correlations. We observe more than 100 entangled photon pairs per second. A test of a Bell inequality can be performed in an afternoon.
@article{arxiv.quant-ph/0205172,
title = {Entangled photon apparatus for the undergraduate laboratory},
author = {Dietrich Dehlinger and M. W. Mitchell},
journal= {arXiv preprint arXiv:quant-ph/0205172},
year = {2009}
}