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We present a strategy for producing multi-qubit gates that promise highfidelity with minimal tuning requirements. Our strategy combines gap protectionfrom the adiabatic theorem with dynamical decoupling in a complementary manner.To avoid degenerate states and maximize the benefit of the gap protection, thescheme is best suited when there are two different kinds of qubits (notmutually resonant). Furthermore, we require a robust operating point in controlspace where the qubits interact with little sensitivity to noise. This allowsus to circumvent a No-Go theorem that prevents block-box dynamically correctedgates [Phys. Rev. A 80, 032314 (2009)]. We show how to apply our strategy to anarchitecture in Si with P donors where we assume we can shuttle electronsbetween different donors. Electron spins act as mobile ancillary qubits and Pnuclear spins act as long-lived data qubits. This system can have a very robustoperating point where the electron spin is bound to a donor in the quadraticStark shift regime. High fidelity single qubit gates may be performed usingwell-established global magnetic resonance pulse sequences. Single electronspin preparation and measurement has also been demonstrated. Putting this alltogether, we present a robust universal gate set for quantum computation.

Multi-qubit gates protected by adiabaticity and dynamical decoupling applicable to donor qubits in silicon