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Xiao Xue, Maximilian Rimbach-Russ, Nodar Samkharadze, Brennan Undseth, Amir Sammak, Giordano Scappucci, Lieven M. K. Vandersypen
High-fidelity control of quantum bits is paramount for the reliable execution of quantum algorithms and for achieving fault tolerance—the ability to correct errors faster than they occur 1 . The central requirement for fault tolerance is expressed in terms of an error threshold. Whereas the actual threshold depends on many details, a common target is the approximately 1% error threshold of the well-known surface code 2,3 . Reaching two-qubit gate fidelities above 99% has been a long-standing major goal for semiconductor spin qubits. These qubits are promising for scaling, as they can leverage advanced semiconductor technology 4 . Here we report a spin-based quantum processor in silicon with single-qubit and two-qubit gate fidelities, all of which are above 99.5%, extracted from gate-set tomography. The average single-qubit gate fidelities remain above 99% when including crosstalk and idling errors on the neighbouring qubit. Using this high-fidelity gate set, we execute the demanding task of calculating molecular ground-state energies using a variational quantum eigensolver algorithm 5 . Having surpassed the 99% barrier for the two-qubit gate fidelity, semiconductor qubits are well positioned on the path to fault tolerance and to possible applications in the era of noisy intermediate-scale quantum devices.
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Xue, X., Rimbach-Russ, M., Samkharadze, N., Undseth, B., Sammak, A., Scappucci, G., & Vandersypen, L. M. K. (2022). Quantum logic with spin qubits crossing the surface code threshold. Nature, 601(7893), 343–347. https://doi.org/10.1038/s41586-021-04273-w
Xue, Xiao, et al. "Quantum logic with spin qubits crossing the surface code threshold." Nature, vol. 601, no. 7893, 2022, pp. 343–347, https://doi.org/10.1038/s41586-021-04273-w.
Xue, Xiao, Maximilian Rimbach-Russ, Nodar Samkharadze, Brennan Undseth, Amir Sammak, Giordano Scappucci, and Lieven M. K. Vandersypen. "Quantum logic with spin qubits crossing the surface code threshold." Nature 601, no. 7893 (2022): 343–347. https://doi.org/10.1038/s41586-021-04273-w.
Xue X., Rimbach-Russ M., Samkharadze N. [и др.] Quantum logic with spin qubits crossing the surface code threshold // Nature. — 2022. — Vol. 601, № 7893. — P. 343–347. — URL: https://doi.org/10.1038/s41586-021-04273-w
@article{xue2022quantum,
title = {{Quantum logic with spin qubits crossing the surface code threshold}},
author = {Xiao Xue and Maximilian Rimbach-Russ and Nodar Samkharadze and Brennan Undseth and Amir Sammak and Giordano Scappucci and Lieven M. K. Vandersypen},
journal = {Nature},
year = {2022},
volume = {601},
number = {7893},
pages = {343--347},
doi = {10.1038/s41586-021-04273-w},
url = {https://doi.org/10.1038/s41586-021-04273-w}
}TY - JOUR AU - Xue, Xiao AU - Rimbach-Russ, Maximilian AU - Samkharadze, Nodar AU - Undseth, Brennan AU - Sammak, Amir AU - Scappucci, Giordano AU - Vandersypen, Lieven M. K. TI - Quantum logic with spin qubits crossing the surface code threshold JO - Nature VL - 601 IS - 7893 SP - 343 EP - 347 PY - 2022 DA - 2022/01/19 DO - 10.1038/s41586-021-04273-w UR - https://doi.org/10.1038/s41586-021-04273-w ER -
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