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Two-qubit silicon quantum processor with operation fidelity exceeding 99%



Michael Gullans, Adam Mills, Charlie Guinn, Anthony Sigillito, Mayer Feldman, Nielsen Erik, Jason Petta


Silicon spin qubits satisfy the necessary criteria for quantum information processing. However, precision is required to support error correction, namely high accuracy state preparation and readout as well as high fidelity single- and two-qubit control. We use two qubits in a six qubit Si/SiGe quantum processor to demonstrate, for the first time, state preparation/readout over 96% with both single- and two-qubit control fidelities above 99%. The operation of the quantum processor is quantitatively characterized using gate set tomography and randomized benchmarking protocols. Our results highlight the future potential of silicon spin qubits in the development of intermediate- scale quantum processors.
Science Advances


quantum computing, spin qubits, quantum process tomography


Gullans, M. , Mills, A. , Guinn, C. , Sigillito, A. , Feldman, M. , Erik, N. and Petta, J. (2022), Two-qubit silicon quantum processor with operation fidelity exceeding 99%, Science Advances, [online],, (Accessed April 17, 2024)
Created April 6, 2022, Updated November 29, 2022