Silicon-based Quantum Computing: High-density, High-temperature Qubits

We review current status, prospects and challenges facing the realization of quantum processors based on silicon quantum dots. This platform represents an attractive pathway to full-scale quantum computing because of the long spin qubit coherence times available in silicon and its compatibility with CMOS manufacturing. Current benchmarks for qubit fidelity are discussed and processor architecture options presented. Key aspects determining the prospects for scaling to the millions of qubits required for fault-tolerant quantum computing are considered, including wiring overheads, quantum interconnects and processor operation temperature.