High-fidelity two-qubit quantum logic gates in a trapped-ion chain using axial motional modes
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arXiv
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| Main Authors: | , , , , , |
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| Format: | Preprint |
| Published: |
2025
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| _version_ | 1866915855457058816 |
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| author | Zhao, Xingyu Bian, Ji Li, Yi Li, Yue Zhang, Mengxiang Lin, Yiheng |
| author_facet | Zhao, Xingyu Bian, Ji Li, Yi Li, Yue Zhang, Mengxiang Lin, Yiheng |
| contents | Trapped-ion systems are one of the leading platforms for quantum information processing, where a key challenge is to scale up system size while maintaining high-fidelity two-qubit operations. A promising approach is to build high-performance modules interconnected via strong coupling. In particular, axial motional modes provide a feasible means of coupling short ion chains. However, previous implementations of fully connected 5-ion modules based on axial modes have been limited to fidelities of $96.6-98.0\%$. Here, we demonstrate two-qubit quantum logic gates in a 5-ion $^{40}$Ca$^{+}$ chain using axial modes, achieving fidelities exceeding $99\%$ for adjacent pairs and over $98\%$ for arbitrary pairs by carefully tackling dominant error sources. Our results are beneficial to the development of scalable ion-trap quantum processors, quantum simulation and quantum-enhanced metrology. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2507_00504 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | High-fidelity two-qubit quantum logic gates in a trapped-ion chain using axial motional modes Zhao, Xingyu Bian, Ji Li, Yi Li, Yue Zhang, Mengxiang Lin, Yiheng Quantum Physics Trapped-ion systems are one of the leading platforms for quantum information processing, where a key challenge is to scale up system size while maintaining high-fidelity two-qubit operations. A promising approach is to build high-performance modules interconnected via strong coupling. In particular, axial motional modes provide a feasible means of coupling short ion chains. However, previous implementations of fully connected 5-ion modules based on axial modes have been limited to fidelities of $96.6-98.0\%$. Here, we demonstrate two-qubit quantum logic gates in a 5-ion $^{40}$Ca$^{+}$ chain using axial modes, achieving fidelities exceeding $99\%$ for adjacent pairs and over $98\%$ for arbitrary pairs by carefully tackling dominant error sources. Our results are beneficial to the development of scalable ion-trap quantum processors, quantum simulation and quantum-enhanced metrology. |
| title | High-fidelity two-qubit quantum logic gates in a trapped-ion chain using axial motional modes |
| topic | Quantum Physics |
| url | https://arxiv.org/abs/2507.00504 |