Optical Resonator (IMAGE) University of Innsbruck Caption At the core of the experiment by Rainer Blatt's group in Innsbruck lies an optical resonator consisting of two highly reflective mirrors. Credit Photo: C. Lackner Usage Restrictions Only in connection with reports on research results by Rainer Blatt and his group at the University of Innsbruck, Austria 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.