Unit Cell in Photonic Array (IMAGE) Joint Quantum Institute Caption The 2D array consists of resonator rings, where light spends more time, and link rings, where light spends little time. Undergoing a circuit around a complete unit cell of rings, light will return to the starting point with a slight change in phase, phi. Credit Sean Kelley/JQI 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.