Figure (IMAGE) Japan Science and Technology Agency Caption Schematic of modes of interest in the single-magnon detector. The uniformly-processing mode of collective spin excitations in the ferromagnetic crystal, called Kittel mode, is coherently coupler to a superconducting qubit through a microwave cavity mode. Credit ©Dany Lachance-Quirion 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.