Omar Magaña-Loaiza (image) Louisiana State University Share Print E-Mail Caption Omar Magaña-Loaiza observes his efficient source of spontaneous parametric down-conversion. This source uses a nonlinear crystal to produce correlated photon pairs. Credit Elsa Hahne, LSU Usage Restrictions None Share Print E-Mail Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.