Publications

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

Mills, Adam R.; Guinn, Charles R.; Gullans, Michael J.; Sigillito, Anthony J.; Feldman, Mayer M.; Nielsen, Erik N.; Petta, Jason R.

Silicon spin qubits satisfy the necessary criteria for quantum information processing. However, a demonstration of high-fidelity state preparation and readout combined with high-fidelity single- and two-qubit gates, all of which must be present for quantum error correction, has been lacking. We use a two-qubit Si/SiGe quantum processor to demonstrate state preparation and readout with fidelity greater than 97%, combined with both singleand two-qubit control fidelities exceeding 99%. The operation of the quantum processor is quantitatively characterized using gate set tomography and randomized benchmarking. Our results highlight the potential of silicon spin qubits to become a dominant technology in the development of intermediate-scale quantum processors.