Quantum Dots -- Photons (IMAGE) Linköping University Caption This image shows two ways of creating polarized light. Credit Fredrik Karlsson, Linköping University Usage Restrictions Credit: Fredrik Karlsson, Linköping University License Licensed content 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.