Entanglement of three photons from the decay of ortho-positronium is re-analyzed. We use the full three body phase space to write down the entangled states classified according to the spin directions of the ortho-positronium. Even in the case when the spin is perpendicular to the decay plane, we find non-negligible phases entering the entangled state. This has not been noticed before. We advocate a fixed quantization axis of the spin for the sake of generality. A brief discussion of a three dimensional formalism for photons, including correlations, versus a two dimensional one is given.
@article{arxiv.1708.07568,
title = {Three Photon Entanglement from Ortho-Positronium Revisited},
author = {Marek Nowakowski and Diego Bedoya Fierro},
journal= {arXiv preprint arXiv:1708.07568},
year = {2017}
}
Comments
Proceedings of the second Jagiellonian Symposium on Fundamental and Applied Subatomic Physics