Multiplexed double-transmon coupler scheme in scalable superconducting quantum processor
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arXiv
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| Autori principali: | , , , , , , , , , |
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| Natura: | Preprint |
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2025
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| _version_ | 1866917057937801216 |
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| author | Cai, Tianqi Chen, Chitong Bu, Kunliang Huai, Sainan Yang, Xiaopei Zong, Zhiwen Li, Yuan Zhang, Zhenxing Zheng, Yi-Cong Zhang, Shengyu |
| author_facet | Cai, Tianqi Chen, Chitong Bu, Kunliang Huai, Sainan Yang, Xiaopei Zong, Zhiwen Li, Yuan Zhang, Zhenxing Zheng, Yi-Cong Zhang, Shengyu |
| contents | Precise control of superconducting qubits is essential for advancing both quantum simulation and quantum error correction. Recently, transmon qubit systems employing the single-transmon coupler (STC) scheme have demonstrated high-fidelity single- and two-qubit gate operations by dynamically tuning the effective coupling between qubits. However, the integration of STCs increases the number of control lines, thereby posing a significant bottleneck for chip routing and scalability. To address this challenge, we propose a robust control line multiplexing scheme based on a double-transmon coupler (DTC) architecture, which enables shared coupler control lines to substantially reduce wiring complexity. Moreover, we experimentally verify that this multiplexed configuration efficiently suppresses undesirable static $ZZ$ coupling while maintaining accurate control over two-qubit gate operations. We further demonstrate the feasibility of the architecture through two distinct gate implementations: a fast coupler $Z$-control-based CZ gate and a parametric iSWAP gate. To validate the practical applicability of this multiplexing approach in quantum circuits, we prepare Bell and three-qubit GHZ states using the proposed scheme with fidelity exceeding 99% and 96%, respectively. This multiplexed DTC architecture offers significant potential to minimize wiring overhead in two-dimensional qubit arrays, thereby greatly enhancing the scalability of superconducting quantum processors. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2511_02249 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Multiplexed double-transmon coupler scheme in scalable superconducting quantum processor Cai, Tianqi Chen, Chitong Bu, Kunliang Huai, Sainan Yang, Xiaopei Zong, Zhiwen Li, Yuan Zhang, Zhenxing Zheng, Yi-Cong Zhang, Shengyu Quantum Physics Precise control of superconducting qubits is essential for advancing both quantum simulation and quantum error correction. Recently, transmon qubit systems employing the single-transmon coupler (STC) scheme have demonstrated high-fidelity single- and two-qubit gate operations by dynamically tuning the effective coupling between qubits. However, the integration of STCs increases the number of control lines, thereby posing a significant bottleneck for chip routing and scalability. To address this challenge, we propose a robust control line multiplexing scheme based on a double-transmon coupler (DTC) architecture, which enables shared coupler control lines to substantially reduce wiring complexity. Moreover, we experimentally verify that this multiplexed configuration efficiently suppresses undesirable static $ZZ$ coupling while maintaining accurate control over two-qubit gate operations. We further demonstrate the feasibility of the architecture through two distinct gate implementations: a fast coupler $Z$-control-based CZ gate and a parametric iSWAP gate. To validate the practical applicability of this multiplexing approach in quantum circuits, we prepare Bell and three-qubit GHZ states using the proposed scheme with fidelity exceeding 99% and 96%, respectively. This multiplexed DTC architecture offers significant potential to minimize wiring overhead in two-dimensional qubit arrays, thereby greatly enhancing the scalability of superconducting quantum processors. |
| title | Multiplexed double-transmon coupler scheme in scalable superconducting quantum processor |
| topic | Quantum Physics |
| url | https://arxiv.org/abs/2511.02249 |