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A scaled quantum computer with donor spins in silicon would benefit from aviable semiconductor framework and a strong inherent decoupling of the qubitsfrom the noisy environment. Coupling neighbouring spins via the naturalexchange interaction according to current designs requires gate controlstructures with extremely small length scales. We present a siliconarchitecture where bismuth donors with long coherence times are coupled toelectrons that can shuttle between adjacent quantum dots, thus relaxing thepitch requirements and allowing space between donors for classical controldevices. An adiabatic SWAP operation within each donor/dot pair solves thescalability issues intrinsic to exchange-based two-qubit gates, as it does notrely on sub-nanometer precision in donor placement and is robust against noisein the control fields. We use this SWAP together with well established globalmicrowave Rabi pulses and parallel electron shuttling to construct a surfacecode that needs minimal, feasible local control.

Surface code architecture for donors and dots in silicon with imprecise and nonuniform qubit couplings