Photon Pairs (image) Cluster of Excellence PhoenixD / Leibniz University Hannover Share Print E-Mail Caption Generation of polarization entangled photon pairs at a wavelength of 2.1 micrometres. Credit Michael Kues/PQT Usage Restrictions These images may be used exclusively in the version provided and for editorial purposes only, and only with stating the copyright mark. 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.