C-QuENS is designed to push the boundaries of quantum sensing—a cutting-edge technology that uses the principles of quantum physics to measure physical quantities with extraordinary precision. Unlike conventional sensors, which rely on classical physics, quantum sensors exploit phenomena like entanglement and superposition to detect minute changes in magnetic fields, temperature, or pressure, often at the atomic or molecular level. This makes them especially valuable in fields where sensitivity and accuracy are critical, such as medical diagnostics, semiconductor testing, and environmental monitoring. C-QuENS focuses on a specific type of quantum sensor based on NV (nitrogen-vacancy) centers in diamond, which are tiny defects in the diamond lattice that can be manipulated to act as highly sensitive quantum probes. The project aims to develop new sensing protocols that use entangled states and many-body quantum dynamics to significantly enhance performance beyond what is currently possible. These protocols will be supported by advanced quantum control techniques and signal processing methods, and tested in laboratory settings using multi-qubit systems. In addition to scientific innovation, C-QuENS is committed to translating its breakthroughs into practical technologies, bridging the gap between research and real-world applications. It also plays a strategic role in strengthening Europe’s position in the global quantum landscape by training future experts, contributing to policy discussions, and supporting the development of a robust European supply chain for diamond-based quantum sensors. Through these efforts, C-QuENS not only advances fundamental science but also lays the groundwork for transformative technologies that can benefit society at large.