Bells Inequalities in Quantum Optics

Daniel F. Walls, Gerard J Milburn

Marek Żukowski

Jan Peřina, Z. Hradil, Branislav Jurčo

Y. Ben-Aryeh

Marek Żukowski, Marcin Wieśniak, Wiesław Laskowski

Bell inequalities are proposed for quantum optical fields in intensity measurements; they overcome the problem of additional assumptions on the local variables of earlier inequalities for intensities, and for stronger fields better detect entanglement.

Arvind, Narasimhaiengar Mukunda

The connection between quantum optical nonclassicality and the violation of Bell's inequalities is explored. Bell type inequalities for the electromagnetic field are formulated for general states(arbitrary number or photons, pure or mixed) of quantised radiation and their violation is connected to other nonclassical properties of the field. Classical states are shown to obey these inequalities and for the family of centered Gaussian states the direct connection between violation of Bell-type inequalities and squeezing is established.