Schematic illustration (IMAGE) Forschungsverbund Berlin Caption Surface acoustic waves (SAW) generated by radio-frequency signals applied to interdigital transducers (IDT) control the spin states of optically active color centers in SiC. The coupling strength depends on the spin projection direction of the color centers, which is controlled by an external magnetic field (B). Credit A. Hernandez-Minguez Usage Restrictions The image may only be used with appropriate caption and 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.