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- W4387561230 abstract "Preserving qubit coherence and maintaining high-fidelity qubit control under complex noise environment is an enduring challenge for scalable quantum computing. Here we demonstrate an addressable fault-tolerant single spin qubit with an average control fidelity of 99.12% via randomized benchmarking on a silicon quantum dot device with an integrated micromagnet. Its dephasing time T2* is 1.025 us and can be enlarged to 264 us by using the Hahn echo technique, reflecting strong low-frequency noise in our system. To break through the noise limitation, we introduce geometric quantum computing to obtain high control fidelity by exploiting its noise-resilient feature. However, the control fidelities of the geometric quantum gates are lower than 99%. According to our simulation, the noise-resilient feature of geometric quantum gates is masked by the heating effect. With further optimization to alleviate the heating effect, geometric quantum computing can be a potential approach to reproducibly achieving high-fidelity qubit control in a complex noise environment." @default.
- W4387561230 created "2023-10-12" @default.
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- W4387561230 date "2023-10-10" @default.
- W4387561230 modified "2023-10-13" @default.
- W4387561230 title "Single spin qubit geometric gate in a silicon quantum dot" @default.
- W4387561230 doi "https://doi.org/10.48550/arxiv.2310.06569" @default.
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