We emphasize the Bell state analyzer, a beamsplitter, as an efficient means of detecting two-photon polarization entanglement. Whereas the optimal entanglement witness for spatially separated photons requires coordinated measurement in three bases, the local Bell state analyzer enables an efficient entanglement witness in a single polarization basis. We use Bayesian mean estimation to compare the efficiency of these two witnesses. We report the method and results of this comparison.
@article{arxiv.1506.01682,
title = {Efficient two-photon polarization entanglement detection by Bell state analysis},
author = {Brian P. Williams and Travis S. Humble},
journal= {arXiv preprint arXiv:1506.01682},
year = {2015}
}
Comments
This paper has been withdrawn due to a critical error which diminishes some of the claimed results. Specifically, Eq. 9 was incorrect. Revisions are being made