Flexible Readout and Unconditional Reset for Superconducting Multi-Qubit Processors with Tunable Purcell Filters
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| Autores principales: | , , , , , , , , , , , , , , , , , , , , |
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| Formato: | Preprint |
| Publicado: |
2025
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| author | Xiao, Yong-Xi Feng, Da'er Gu, Xu-Yang Liang, Gui-Han Wang, Ming-Chuan Peng, Zheng-Yu Chen, Bing-Jie Yan, Yu Mei, Zheng-Yang Zhao, Si-Lu Bu, Yi-Zhou Deng, Cheng-Lin Yang, Kai Tian, Ye Song, Xiaohui Zheng, Dongning Zhang, Yu-Xiang Shi, Yun-Hao Xiang, Zhongcheng Xu, Kai Fan, Heng |
| author_facet | Xiao, Yong-Xi Feng, Da'er Gu, Xu-Yang Liang, Gui-Han Wang, Ming-Chuan Peng, Zheng-Yu Chen, Bing-Jie Yan, Yu Mei, Zheng-Yang Zhao, Si-Lu Bu, Yi-Zhou Deng, Cheng-Lin Yang, Kai Tian, Ye Song, Xiaohui Zheng, Dongning Zhang, Yu-Xiang Shi, Yun-Hao Xiang, Zhongcheng Xu, Kai Fan, Heng |
| contents | Achieving high-fidelity qubit readout and reset while preserving qubit coherence is essential for quantum error correction and other advanced quantum algorithms. Here, we design and experimentally demonstrate a scalable architecture employing frequency-tunable nonlinear Purcell filters, enabling flexible readout and fast unconditional reset of multiple superconducting qubits. Our readout protocol dynamically adjusts the effective linewidth of the readout resonator through a tunable Purcell filter, optimizing the signal-to-noise ratio during measurement while suppressing photon noise during idle periods. We achieve a readout fidelity of $99.3\%$ without any quantum-limited amplifier, even with a small dispersive shift. Moreover, by leveraging a reset channel formed via the adjacent coupling between the filter and the coupler, we realize unconditional qubit reset of both leakage-induced $|2\rangle$ and $|1\rangle$ states within 200 ns and reset of the $|1\rangle$ state alone within 75 ns, with error rates $\leq 1\%$. The filter also mitigates both photon-induced dephasing and the Purcell effect, thereby preserving qubit coherence. This scalable Purcell filter architecture shows exceptional performance in qubit readout, reset, and protection, marking it as a promising hardware component for advancing fault-tolerant quantum computing systems. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2507_06988 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Flexible Readout and Unconditional Reset for Superconducting Multi-Qubit Processors with Tunable Purcell Filters Xiao, Yong-Xi Feng, Da'er Gu, Xu-Yang Liang, Gui-Han Wang, Ming-Chuan Peng, Zheng-Yu Chen, Bing-Jie Yan, Yu Mei, Zheng-Yang Zhao, Si-Lu Bu, Yi-Zhou Deng, Cheng-Lin Yang, Kai Tian, Ye Song, Xiaohui Zheng, Dongning Zhang, Yu-Xiang Shi, Yun-Hao Xiang, Zhongcheng Xu, Kai Fan, Heng Quantum Physics Achieving high-fidelity qubit readout and reset while preserving qubit coherence is essential for quantum error correction and other advanced quantum algorithms. Here, we design and experimentally demonstrate a scalable architecture employing frequency-tunable nonlinear Purcell filters, enabling flexible readout and fast unconditional reset of multiple superconducting qubits. Our readout protocol dynamically adjusts the effective linewidth of the readout resonator through a tunable Purcell filter, optimizing the signal-to-noise ratio during measurement while suppressing photon noise during idle periods. We achieve a readout fidelity of $99.3\%$ without any quantum-limited amplifier, even with a small dispersive shift. Moreover, by leveraging a reset channel formed via the adjacent coupling between the filter and the coupler, we realize unconditional qubit reset of both leakage-induced $|2\rangle$ and $|1\rangle$ states within 200 ns and reset of the $|1\rangle$ state alone within 75 ns, with error rates $\leq 1\%$. The filter also mitigates both photon-induced dephasing and the Purcell effect, thereby preserving qubit coherence. This scalable Purcell filter architecture shows exceptional performance in qubit readout, reset, and protection, marking it as a promising hardware component for advancing fault-tolerant quantum computing systems. |
| title | Flexible Readout and Unconditional Reset for Superconducting Multi-Qubit Processors with Tunable Purcell Filters |
| topic | Quantum Physics |
| url | https://arxiv.org/abs/2507.06988 |