Photon Roundabout (image) Institute of Science and Technology Austria Share Print E-Mail Caption The new nonreciprocal device acts as a roundabout for photons. Here, arrows show the direction of photons propagation. Credit IST Austria/ Birgit Rieger Usage Restrictions withcredit 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.