Numerical leakage-aware randomized benchmarking shows that operating a Si:P donor spin system as a native ququart (C4 Clifford group) yields 40-50% lower error rates than encoded two-qubit operation (C2^⊗2) under charge noise, due to reduced circuit complexity.
Gottesman, inQuantum Computing and Quantum Communications, edited by C
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Fidelity Analysis of Adiabatically Driven Donor Spins as Two-Qubit and Ququart Systems
Numerical leakage-aware randomized benchmarking shows that operating a Si:P donor spin system as a native ququart (C4 Clifford group) yields 40-50% lower error rates than encoded two-qubit operation (C2^⊗2) under charge noise, due to reduced circuit complexity.