Single spin qubit geometric gate in a silicon quantum dot
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arXiv
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| Main Authors: | , , , , , , , , , , , , , |
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| Format: | Preprint |
| Published: |
2023
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| Subjects: | |
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| _version_ | 1866910307359653888 |
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| author | Ma, Rong-Long Li, Ao-Ran Wang, Chu Kong, Zhen-Zhen Liao, Wei-Zhu Ni, Ming Zhu, Sheng-Kai Chu, Ning Zhang, Cheng-Xian Liu, Di Cao, Gang Wang, Gui-Lei Li, Hai-Ou Guo, Guo-Ping |
| author_facet | Ma, Rong-Long Li, Ao-Ran Wang, Chu Kong, Zhen-Zhen Liao, Wei-Zhu Ni, Ming Zhu, Sheng-Kai Chu, Ning Zhang, Cheng-Xian Liu, Di Cao, Gang Wang, Gui-Lei Li, Hai-Ou Guo, Guo-Ping |
| contents | 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2310_06569 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Single spin qubit geometric gate in a silicon quantum dot Ma, Rong-Long Li, Ao-Ran Wang, Chu Kong, Zhen-Zhen Liao, Wei-Zhu Ni, Ming Zhu, Sheng-Kai Chu, Ning Zhang, Cheng-Xian Liu, Di Cao, Gang Wang, Gui-Lei Li, Hai-Ou Guo, Guo-Ping Mesoscale and Nanoscale Physics Quantum Physics 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. |
| title | Single spin qubit geometric gate in a silicon quantum dot |
| topic | Mesoscale and Nanoscale Physics Quantum Physics |
| url | https://arxiv.org/abs/2310.06569 |