When materials become very small, discrete quantum states emerge which it is possible to manipulate and measure. These offer the potential for implementing the deep quantum resources of superposition and entanglement. Entanglement offers stronger correlations than classical physical interactions, and is what gives quantum computing its spectacular potential. Carbon materials can encapsulate electron and nuclear spins in ways that can be suitable for quantum technologies. A remarkable molecule for this purpose is N@C60, in which a single atom of nitrogen is isolated from the outside world by being held in a cage of sixty carbon atoms arranged like the corners of the patches on a football. As we learn to understand the properties of candidate nanomaterials, we are discovering how they can be assembled to provide functioning structures for quantum technologies.