nuclear frequency comb (IMAGE) Texas A&M University Caption Illustration of a nuclear frequency comb displaying single photons as visualized on a logarithmic scale from dark to bright colors, with brighter colors indicating instances of time where the stored photons have a higher probability of being retrieved. These instances occur closer together for higher energy spacings and are more spread out in time for lower energy spacings. Credit DESY/Sven Velten Usage Restrictions use with credit 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.