Designing and controlling solid state quantum systems with high accuracy for quantum information processing and quantum sensing. We are in particular engineering superconducting systems as well as controlling single Nitrogen-Vacancy centers in diamond crystals. The Nitrogen-Vacancy center has emerged as a versatile system for quantum sensing and quantum information processing due to its unique control capabilities. Using light and micro-wave radiation, a single NV center can be fully controlled and read-out even at room temperature, and represent therefore one of the promising candidates for scalable quantum computing and ultra-sensitive sensing of magnetic field in ambient environments.