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Bulletin of the American Physical Society

High-fidelity single and two-qubit gates in germanium

Menno Veldhorst

Published Mar 4, 2019• 0 citations
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The promise of quantum information technology hinges on the ability to control large numbers of qubits with high-fidelity. Quantum dots define a promising platform due to their compatibility with semiconductor manufacturing. Moreover, high-fidelity operations above 99.9% have been realized with individual qubits, though their performance has been limited to 98.67% when driving two qubits simultaneously. Here we present single-qubit randomized benchmarking in a two-dimensional array of spin qubits, for one, two and four simultaneously driven qubits. We find that by carefully tuning the qubit parameters, we achieve native gate fidelities of 99.9899(4)%, 99.904(4)% and 99.00(4)% respectively. We also find that cross talk with next-nearest neighbor pairs induces errors that can be imperceptible within the error margin, indicating that cross talk can be highly local. These characterizations of the single-qubit gate quality and the ability to operate simultaneously are crucial aspects for scaling up germanium based quantum information technology.