We continue the analysis of our previous papers that were devoted to type I parametric downconversion, the extension to type II being straightforward. We show that entanglement, in the Wigner representation, is merely a correlation that involves both signals and vacuum fluctuations. An analysis of the detection process opens the way to a complete description of parametric downconversion in terms of pure Maxwell electromagnetic waves.
© 1998 Optical Society of America
Alberto Casado, Trevor W. Marshall, and Emilio Santos, "Type II parametric downconversion in the Wigner-function formalism: entanglement and Bell's inequalities," J. Opt. Soc. Am. B 15, 1572-1577 (1998)