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Spins based in silicon provide one of the most promising architectures forquantum computing. Quantum dots are an inherently scalable technology. Here, wecombine these two concepts into a workable design for a silicon-germaniumquantum bit. The novel structure incorporates vertical and lateral tunneling,provides controlled coupling between dots, and enables single electronoccupation of each dot. Precise modeling of the design elucidates its potentialfor scalable quantum computing. For the first time it is possible to translatethe requirements of fault-tolerant error correction into specific requirementsfor gate voltage control electronics in quantum dots. We demonstrate that theserequirements are met by existing pulse generators in the kHz-MHz range, but GHzoperation is not yet achievable. Our calculations further pinpoint devicefeatures that enhance operation speed and robustness against leakage errors. Wefind that the component technologies for silicon quantum dot quantum computersare already in hand.Comment: References adde

Practical design and simulation of silicon-based quantum-dot qubits