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| Main Authors: | , , , , , , , , , , , , , , , , , , |
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| Format: | Preprint |
| Published: |
2025
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2512.21157 |
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| _version_ | 1866911337539436544 |
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| author | Ge, Yangyang Zhou, Haoyu Zheng, Wen Yu, Xiang-Min Fang, Wei Zhang, Zhenchuan Huang, Wanli Deng, Xiang Cai, Haoyang Li, Xianke Zhou, Kun Che, Hanxin Zhang, Tao Ji, Lichang Zhang, Yu Zhao, Jie Li, Shao-Xiong Tan, Xinsheng Yu, Yang |
| author_facet | Ge, Yangyang Zhou, Haoyu Zheng, Wen Yu, Xiang-Min Fang, Wei Zhang, Zhenchuan Huang, Wanli Deng, Xiang Cai, Haoyang Li, Xianke Zhou, Kun Che, Hanxin Zhang, Tao Ji, Lichang Zhang, Yu Zhao, Jie Li, Shao-Xiong Tan, Xinsheng Yu, Yang |
| contents | Quantum sensing promises measurement precision beyond classical limits, but its practical realization is often hindered by decoherence and the challenges of generating and stabilizing entanglement in large-scale systems. Here, we experimentally demonstrate a scalable, scrambling-enhanced quantum sensing protocol, referred to as butterfly metrology, implemented on a cross-shaped superconducting quantum processor. By harnessing quantum information scrambling, the protocol converts local interactions into delocalized metrologically useful correlations, enabling robust signal amplification through interference of the scrambled and polarized quantum states. We validate the time-reversal ability via Loschmidt echo measurements and quantify the information scrambling through out-of-time-ordered correlators, establishing the essential quantum resources of our protocol. Our measurements reveal that the sensing sensitivity surpasses the standard quantum limit (SQL) with increasing qubit number, reaching 3.78 in a 9-qubit configuration, compared to the SQL of 3.0. The scheme further exhibits inherent robustness to coherent control errors and probed signal noise. This work demonstrates a readily scalable path toward practical quantum sensing advantages with prevalent experimental platforms. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2512_21157 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Information-Scrambling-Enhanced Quantum Sensing Beyond the Standard Quantum Limit Ge, Yangyang Zhou, Haoyu Zheng, Wen Yu, Xiang-Min Fang, Wei Zhang, Zhenchuan Huang, Wanli Deng, Xiang Cai, Haoyang Li, Xianke Zhou, Kun Che, Hanxin Zhang, Tao Ji, Lichang Zhang, Yu Zhao, Jie Li, Shao-Xiong Tan, Xinsheng Yu, Yang Quantum Physics Quantum sensing promises measurement precision beyond classical limits, but its practical realization is often hindered by decoherence and the challenges of generating and stabilizing entanglement in large-scale systems. Here, we experimentally demonstrate a scalable, scrambling-enhanced quantum sensing protocol, referred to as butterfly metrology, implemented on a cross-shaped superconducting quantum processor. By harnessing quantum information scrambling, the protocol converts local interactions into delocalized metrologically useful correlations, enabling robust signal amplification through interference of the scrambled and polarized quantum states. We validate the time-reversal ability via Loschmidt echo measurements and quantify the information scrambling through out-of-time-ordered correlators, establishing the essential quantum resources of our protocol. Our measurements reveal that the sensing sensitivity surpasses the standard quantum limit (SQL) with increasing qubit number, reaching 3.78 in a 9-qubit configuration, compared to the SQL of 3.0. The scheme further exhibits inherent robustness to coherent control errors and probed signal noise. This work demonstrates a readily scalable path toward practical quantum sensing advantages with prevalent experimental platforms. |
| title | Information-Scrambling-Enhanced Quantum Sensing Beyond the Standard Quantum Limit |
| topic | Quantum Physics |
| url | https://arxiv.org/abs/2512.21157 |