Deterministic non-local parity control and supercurrent-based detection in an Andreev molecule
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| Main Authors: | , , , , , , , , , , , , , , , , , |
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| Format: | Preprint |
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2026
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| _version_ | 1866911402369744896 |
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| author | Zhu, Shang Yang, Xiaozhou Liu, Mingli Wei, Min Jiao, Yiping He, Jiezhong Tong, Bingbing Feng, Junya Dou, Ziwei Li, Peiling Shen, Jie Song, Xiaohui Liu, Guangtong Lyu, Zhaozheng Pan, Dong Zhao, Jianhua Lu, Li Qu, Fanming |
| author_facet | Zhu, Shang Yang, Xiaozhou Liu, Mingli Wei, Min Jiao, Yiping He, Jiezhong Tong, Bingbing Feng, Junya Dou, Ziwei Li, Peiling Shen, Jie Song, Xiaohui Liu, Guangtong Lyu, Zhaozheng Pan, Dong Zhao, Jianhua Lu, Li Qu, Fanming |
| contents | The ability to manipulate and detect the parity of quantum states in superconductor-semiconductor hybrid systems is pivotal to realizing the promise of topological quantum computation. However, as these architectures scale toward artificial Kitaev chains with phase-control loops, local accessibility becomes restricted, constraining conventional local parity control and detection. While Andreev molecules offer a platform for non-local intervention, deterministic protocols for parity manipulation have yet to be experimentally established. Here, we demonstrate deterministic non-local control over the parity configuration of a quantum dot (QD) by electrically modulating the coherent hybridization with a spatially adjacent QD within an Andreev molecule. By systematically investigating three distinct joint parity configuration regimes in the elastic co-tunneling limit, we experimentally uncover the operational conditions for this non-local control. In conjunction with theoretical simulations establishing a global phase diagram, we identify a set of universal selection rules governing parity transitions, dictated by the symmetry-imposed interplay between the joint parity configuration and the dominant inter-dot coupling mechanism (elastic co-tunneling vs. crossed Andreev reflection). Furthermore, we establish the supercurrent, directly signaled by zero-bias conductance peaks, as an intrinsic, sensor-free probe of the parity configuration, obviating the need for auxiliary charge sensors. Our results provide a validated physical framework for parity engineering, offering a key building block for scalable, multi-QD superconducting architectures. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2601_19373 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Deterministic non-local parity control and supercurrent-based detection in an Andreev molecule Zhu, Shang Yang, Xiaozhou Liu, Mingli Wei, Min Jiao, Yiping He, Jiezhong Tong, Bingbing Feng, Junya Dou, Ziwei Li, Peiling Shen, Jie Song, Xiaohui Liu, Guangtong Lyu, Zhaozheng Pan, Dong Zhao, Jianhua Lu, Li Qu, Fanming Mesoscale and Nanoscale Physics The ability to manipulate and detect the parity of quantum states in superconductor-semiconductor hybrid systems is pivotal to realizing the promise of topological quantum computation. However, as these architectures scale toward artificial Kitaev chains with phase-control loops, local accessibility becomes restricted, constraining conventional local parity control and detection. While Andreev molecules offer a platform for non-local intervention, deterministic protocols for parity manipulation have yet to be experimentally established. Here, we demonstrate deterministic non-local control over the parity configuration of a quantum dot (QD) by electrically modulating the coherent hybridization with a spatially adjacent QD within an Andreev molecule. By systematically investigating three distinct joint parity configuration regimes in the elastic co-tunneling limit, we experimentally uncover the operational conditions for this non-local control. In conjunction with theoretical simulations establishing a global phase diagram, we identify a set of universal selection rules governing parity transitions, dictated by the symmetry-imposed interplay between the joint parity configuration and the dominant inter-dot coupling mechanism (elastic co-tunneling vs. crossed Andreev reflection). Furthermore, we establish the supercurrent, directly signaled by zero-bias conductance peaks, as an intrinsic, sensor-free probe of the parity configuration, obviating the need for auxiliary charge sensors. Our results provide a validated physical framework for parity engineering, offering a key building block for scalable, multi-QD superconducting architectures. |
| title | Deterministic non-local parity control and supercurrent-based detection in an Andreev molecule |
| topic | Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2601.19373 |