Close-up of chip (IMAGE) Optica Caption New chip-based devices contain all the optical components necessary for quantum key distribution. The cost-effective platform is designed to facilitate citywide networks. Credit Henry Semenenko, University of Bristol Usage Restrictions None 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.