Tim Taminiau is a team leader at QuTech, Delft University of Technology. He investigates solid-state spins and their applications for quantum information and physics. His group uses a combination of quantum optics, magnetic resonance and nanoscale fabrication to detect and control individual spins associated with defect centres. With these controlled systems of coupled spins, Tim’s group aims to answer questions such as these: How does decoherence emerge in complex quantum systems? Can we use quantum coherence to realize novel improved sensors? Can we protect quantum states and computations indefinitely so that large-scale quantum computations become possible? Does quantum mechanics continue to accurately describe such extended large-scale quantum systems?