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| Format: | Preprint |
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2023
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| Online-Zugang: | https://arxiv.org/abs/2308.16040 |
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| _version_ | 1866908352391413760 |
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| author | Ma, Xizheng Zhang, Gengyan Wu, Feng Bao, Feng Chang, Xu Chen, Jianjun Deng, Hao Gao, Ran Gao, Xun Hu, Lijuan Ji, Honghong Ku, Hsiang-Sheng Lu, Kannan Ma, Lu Mao, Liyong Song, Zhijun Sun, Hantao Tang, Chengchun Wang, Fei Wang, Hongcheng Wang, Tenghui Xia, Tian Ying, Make Zhan, Huijuan Zhou, Tao Zhu, Mengyu Zhu, Qingbin Shi, Yaoyun Zhao, Hui-Hai Deng, Chunqing |
| author_facet | Ma, Xizheng Zhang, Gengyan Wu, Feng Bao, Feng Chang, Xu Chen, Jianjun Deng, Hao Gao, Ran Gao, Xun Hu, Lijuan Ji, Honghong Ku, Hsiang-Sheng Lu, Kannan Ma, Lu Mao, Liyong Song, Zhijun Sun, Hantao Tang, Chengchun Wang, Fei Wang, Hongcheng Wang, Tenghui Xia, Tian Ying, Make Zhan, Huijuan Zhou, Tao Zhu, Mengyu Zhu, Qingbin Shi, Yaoyun Zhao, Hui-Hai Deng, Chunqing |
| contents | The fluxonium qubits have emerged as a promising platform for gate-based quantum information processing. However, their extraordinary protection against charge fluctuations comes at a cost: when coupled capacitively, the qubit-qubit interactions are restricted to XX-interactions. Consequently, effective XX- or XZ-interactions are only constructed either by temporarily populating higher-energy states, or by exploiting perturbative effects under microwave driving. Instead, we propose and demonstrate an inductive coupling scheme, which offers a wide selection of native qubit-qubit interactions for fluxonium. In particular, we leverage a built-in, flux-controlled ZZ-interaction to perform qubit entanglement. To combat the increased flux-noise-induced dephasing away from the flux-insensitive position, we use a continuous version of the dynamical decoupling scheme to perform noise filtering. Combining these, we demonstrate a 20 ns controlled-Z (CZ) gate with a mean fidelity of 99.53%. More than confirming the efficacy of our gate scheme, this high-fidelity result also reveals a promising but rarely explored parameter space uniquely suitable for gate operations between fluxonium qubits. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2308_16040 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Native approach to controlled-Z gates in inductively coupled fluxonium qubits Ma, Xizheng Zhang, Gengyan Wu, Feng Bao, Feng Chang, Xu Chen, Jianjun Deng, Hao Gao, Ran Gao, Xun Hu, Lijuan Ji, Honghong Ku, Hsiang-Sheng Lu, Kannan Ma, Lu Mao, Liyong Song, Zhijun Sun, Hantao Tang, Chengchun Wang, Fei Wang, Hongcheng Wang, Tenghui Xia, Tian Ying, Make Zhan, Huijuan Zhou, Tao Zhu, Mengyu Zhu, Qingbin Shi, Yaoyun Zhao, Hui-Hai Deng, Chunqing Quantum Physics The fluxonium qubits have emerged as a promising platform for gate-based quantum information processing. However, their extraordinary protection against charge fluctuations comes at a cost: when coupled capacitively, the qubit-qubit interactions are restricted to XX-interactions. Consequently, effective XX- or XZ-interactions are only constructed either by temporarily populating higher-energy states, or by exploiting perturbative effects under microwave driving. Instead, we propose and demonstrate an inductive coupling scheme, which offers a wide selection of native qubit-qubit interactions for fluxonium. In particular, we leverage a built-in, flux-controlled ZZ-interaction to perform qubit entanglement. To combat the increased flux-noise-induced dephasing away from the flux-insensitive position, we use a continuous version of the dynamical decoupling scheme to perform noise filtering. Combining these, we demonstrate a 20 ns controlled-Z (CZ) gate with a mean fidelity of 99.53%. More than confirming the efficacy of our gate scheme, this high-fidelity result also reveals a promising but rarely explored parameter space uniquely suitable for gate operations between fluxonium qubits. |
| title | Native approach to controlled-Z gates in inductively coupled fluxonium qubits |
| topic | Quantum Physics |
| url | https://arxiv.org/abs/2308.16040 |