High-Fidelity Controlled-Phase Gate for Binomial Codes via Geometric Phase Engineering
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arXiv
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| Format: | Preprint |
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2025
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| _version_ | 1866917549873037312 |
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| author | Xu, Yifang Zhou, Yilong Sun, Lida Huang, Hongwei Chen, Zi-Jie Xiao, Lintao Zhang, Bo Ma, Chuanlong Hua, Ziyue Wang, Weiting Xue, Guangming Yu, Haifeng Cai, Weizhou Zou, Chang-Ling Sun, Luyan |
| author_facet | Xu, Yifang Zhou, Yilong Sun, Lida Huang, Hongwei Chen, Zi-Jie Xiao, Lintao Zhang, Bo Ma, Chuanlong Hua, Ziyue Wang, Weiting Xue, Guangming Yu, Haifeng Cai, Weizhou Zou, Chang-Ling Sun, Luyan |
| contents | High-fidelity two-logical-qubit gates are essential for realizing fault-tolerant quantum computation with bosonic codes, yet experimentally reported fidelities have rarely exceeded 90\%. Here, we propose a geometric phase engineering approach for implementing controlled-phase gates for binomially encoded logical qubits. This method leverages the structural simplicity of geometric drives to reduce the numerical optimization dimensionality while fully incorporating system nonlinearities, enabling fast and high-fidelity logical operations. As an example, we experimentally demonstrate a process fidelity of 97.4$\pm$0.8\% for a controlled-Z gate between two binomial codes, surpassing all previously reported two-logical-qubit gates in bosonic codes. This work demonstrates that geometric phase engineering provides an effective and experimentally feasible route to fast, high-fidelity logical operations in bosonic quantum processors. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2511_06354 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | High-Fidelity Controlled-Phase Gate for Binomial Codes via Geometric Phase Engineering Xu, Yifang Zhou, Yilong Sun, Lida Huang, Hongwei Chen, Zi-Jie Xiao, Lintao Zhang, Bo Ma, Chuanlong Hua, Ziyue Wang, Weiting Xue, Guangming Yu, Haifeng Cai, Weizhou Zou, Chang-Ling Sun, Luyan Quantum Physics High-fidelity two-logical-qubit gates are essential for realizing fault-tolerant quantum computation with bosonic codes, yet experimentally reported fidelities have rarely exceeded 90\%. Here, we propose a geometric phase engineering approach for implementing controlled-phase gates for binomially encoded logical qubits. This method leverages the structural simplicity of geometric drives to reduce the numerical optimization dimensionality while fully incorporating system nonlinearities, enabling fast and high-fidelity logical operations. As an example, we experimentally demonstrate a process fidelity of 97.4$\pm$0.8\% for a controlled-Z gate between two binomial codes, surpassing all previously reported two-logical-qubit gates in bosonic codes. This work demonstrates that geometric phase engineering provides an effective and experimentally feasible route to fast, high-fidelity logical operations in bosonic quantum processors. |
| title | High-Fidelity Controlled-Phase Gate for Binomial Codes via Geometric Phase Engineering |
| topic | Quantum Physics |
| url | https://arxiv.org/abs/2511.06354 |