At QuTech, Veldhorst is working in the fault-tolerant quantum computing roadmap on quantum computing with silicon and germanium. His team proposed a novel architecture for large-scale quantum computation with silicon quantum dots. These architectures are based on crossbar arrays that can define logical qubits with very low logical error rates. Now the team is experimentally testing these concepts in the lab to find out the best way forward. Recently, his team demonstrated that silicon quantum dots can have appreciable spin lifetimes at temperatures above 1 Kelvin. While this is still a very low temperature, the increase in temperature as compared to many other qubit platforms may just be the increase that is needed for scalable quantum devices. This is because at the temperatures where these ‘hot qubits’ operate, classical electronics may be integrated on the quantum chip or even directly on top of the qubits, thereby overcoming an interconnect bottleneck.