Quantum computers will allow specific algorithms to be performed with unprecedented efficiency and push ahead the frontiers of knowledge. Donor spin qubits in silicon are an ideal platform for that : they can be fabricated with standard semiconductor processes, are controlled with error rates as small as 10-4 and maintain their quantum coherence for almost a minute . However, multi-qubit operations and long-distance donor coupling remain a formidable challenge. Here we present a scalable design for a silicon quantum processor  that is compatible with current fabrication capabilities. Quantum information is encoded in the electron-nuclear spin states, while long-distance high-fidelity interactions can be achieved either via direct electric dipole interactions or via photonic links. Prototypical devices are fabricated to demonstrate the processor’s basic units.
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