High-contrast ZZ interaction using superconducting qubits with opposite-sign anharmonicity
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arXiv
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| Main Authors: | , , , , , , |
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| Format: | Preprint |
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2020
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| _version_ | 1866929496687378432 |
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| author | Zhao, Peng Xu, Peng Lan, Dong Chu, Ji Tan, Xinsheng Yu, Haifeng Yu, Yang |
| author_facet | Zhao, Peng Xu, Peng Lan, Dong Chu, Ji Tan, Xinsheng Yu, Haifeng Yu, Yang |
| contents | For building a scalable quantum processor with superconducting qubits, ZZ interaction is of great concern because its residual has a crucial impact to two-qubit gate fidelity. Two-qubit gates with fidelity meeting the criterion of fault-tolerant quantum computationhave been demonstrated using ZZ interaction. However, as the performance of quantum processors improves, the residual static-ZZ can become a performance-limiting factor for quantum gate operation and quantum error correction. Here, we introduce a superconducting architecture using qubits with opposite-sign anharmonicity, a transmon qubit and a C-shunt flux qubit, to address this issue. We theoretically demonstrate that by coupling the two types of qubits, the high-contrast ZZ interaction can be realized. Thus, we can control the interaction with a high on/off ratio to implement two-qubit CZ gates, or suppress it during two-qubit gate operation using XY interaction (e.g., an iSWAP gate). The proposed architecture can also be scaled up to multi-qubit cases. In a fixed coupled system, ZZ crosstalk related to neighboring spectator qubits could also be heavily suppressed. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2002_07560 |
| institution | arXiv |
| publishDate | 2020 |
| record_format | arxiv |
| spellingShingle | High-contrast ZZ interaction using superconducting qubits with opposite-sign anharmonicity Zhao, Peng Xu, Peng Lan, Dong Chu, Ji Tan, Xinsheng Yu, Haifeng Yu, Yang Quantum Physics For building a scalable quantum processor with superconducting qubits, ZZ interaction is of great concern because its residual has a crucial impact to two-qubit gate fidelity. Two-qubit gates with fidelity meeting the criterion of fault-tolerant quantum computationhave been demonstrated using ZZ interaction. However, as the performance of quantum processors improves, the residual static-ZZ can become a performance-limiting factor for quantum gate operation and quantum error correction. Here, we introduce a superconducting architecture using qubits with opposite-sign anharmonicity, a transmon qubit and a C-shunt flux qubit, to address this issue. We theoretically demonstrate that by coupling the two types of qubits, the high-contrast ZZ interaction can be realized. Thus, we can control the interaction with a high on/off ratio to implement two-qubit CZ gates, or suppress it during two-qubit gate operation using XY interaction (e.g., an iSWAP gate). The proposed architecture can also be scaled up to multi-qubit cases. In a fixed coupled system, ZZ crosstalk related to neighboring spectator qubits could also be heavily suppressed. |
| title | High-contrast ZZ interaction using superconducting qubits with opposite-sign anharmonicity |
| topic | Quantum Physics |
| url | https://arxiv.org/abs/2002.07560 |