Tunable Hybrid-Mode Coupler Enabling Strong Interactions between Transmons at Centimeter-Scale Distance
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arXiv
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| Main Authors: | , , , , , , , , , , , , , , |
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| Format: | Preprint |
| Published: |
2025
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| _version_ | 1866909987087843328 |
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| author | Xu, Jianwen Deng, Xiang Zheng, Wen Yan, Wenchang Zhang, Tao Zhang, Zhenchuan Huang, Wanli Xia, Xiaoyu Liao, Xudong Zhang, Yu Zhao, Jie Li, Shaoxiong Tan, Xinsheng Lan, Dong Yu, Yang |
| author_facet | Xu, Jianwen Deng, Xiang Zheng, Wen Yan, Wenchang Zhang, Tao Zhang, Zhenchuan Huang, Wanli Xia, Xiaoyu Liao, Xudong Zhang, Yu Zhao, Jie Li, Shaoxiong Tan, Xinsheng Lan, Dong Yu, Yang |
| contents | The transmon, a fabrication-friendly superconducting qubit, remains a leading candidate for scalable quantum computing. Recent advances in tunable couplers have accelerated progress toward high-performance quantum processors. However, extending coherent interactions beyond millimeter scales to enhance quantum connectivity presents a critical challenge. Here, we introduce a hybrid-mode coupler exploiting resonator-transmon hybridization to simultaneously engineer the two lowest-frequency mode, enabling high-contrast coupling between centimeter-scale transmons. For a 1-cm coupler, our framework predicts flux-tunable $XX$ and $ZZ$ coupling strengths reaching 23 MHz and 100 MHz, with modulation contrasts exceeding $10^2$ and $10^4$, respectively, demonstrating quantitative agreement with an effective two-channel model. This work provides an efficient pathway to mitigate the inherent connectivity constraints imposed by short-range interactions, enabling transmon-based architectures compatible with hardware-efficient quantum tasks. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2506_14128 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Tunable Hybrid-Mode Coupler Enabling Strong Interactions between Transmons at Centimeter-Scale Distance Xu, Jianwen Deng, Xiang Zheng, Wen Yan, Wenchang Zhang, Tao Zhang, Zhenchuan Huang, Wanli Xia, Xiaoyu Liao, Xudong Zhang, Yu Zhao, Jie Li, Shaoxiong Tan, Xinsheng Lan, Dong Yu, Yang Quantum Physics The transmon, a fabrication-friendly superconducting qubit, remains a leading candidate for scalable quantum computing. Recent advances in tunable couplers have accelerated progress toward high-performance quantum processors. However, extending coherent interactions beyond millimeter scales to enhance quantum connectivity presents a critical challenge. Here, we introduce a hybrid-mode coupler exploiting resonator-transmon hybridization to simultaneously engineer the two lowest-frequency mode, enabling high-contrast coupling between centimeter-scale transmons. For a 1-cm coupler, our framework predicts flux-tunable $XX$ and $ZZ$ coupling strengths reaching 23 MHz and 100 MHz, with modulation contrasts exceeding $10^2$ and $10^4$, respectively, demonstrating quantitative agreement with an effective two-channel model. This work provides an efficient pathway to mitigate the inherent connectivity constraints imposed by short-range interactions, enabling transmon-based architectures compatible with hardware-efficient quantum tasks. |
| title | Tunable Hybrid-Mode Coupler Enabling Strong Interactions between Transmons at Centimeter-Scale Distance |
| topic | Quantum Physics |
| url | https://arxiv.org/abs/2506.14128 |