The model of a quantum-optical device for a conditional preparation of entangled states from input mixed states is presented. It is demonstrated that even thermal or pseudo-thermal radiation can be entangled in such a way, that Bell-inequalities are violated.
@article{arxiv.quant-ph/0105080,
title = {Bell-inequality violation with "thermal" radiation},
author = {Radim Filip and Miloslav Dusek and Jaromir Fiurasek and Ladislav Mista},
journal= {arXiv preprint arXiv:quant-ph/0105080},
year = {2009}
}