Density of States (Gate) - Controlled Andreev Molecule and Sensor
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arXiv
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| Auteurs principaux: | , , , , , , , , , , , , , , , , , , , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866915432238153728 |
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| author | Shi, Xiaofan Dou, Ziwei Li, Guoan Pan, Dong Song, Yuxiao Wang, Anqi Zhang, Zhiyuan Guo, Xingchen Deng, Xiao Zhang, Ruixuan Xu, Liangqian Chen, Xiao Li, Yupeng Tong, Bingbing Song, Xiaohui Lyu, Zhaozheng Li, Peiling Qu, Fanming Liu, Guangtong Zhao, Jianhua Lu, Li Shen, Jie |
| author_facet | Shi, Xiaofan Dou, Ziwei Li, Guoan Pan, Dong Song, Yuxiao Wang, Anqi Zhang, Zhiyuan Guo, Xingchen Deng, Xiao Zhang, Ruixuan Xu, Liangqian Chen, Xiao Li, Yupeng Tong, Bingbing Song, Xiaohui Lyu, Zhaozheng Li, Peiling Qu, Fanming Liu, Guangtong Zhao, Jianhua Lu, Li Shen, Jie |
| contents | Topological quantum computing typically relies on topological Andreev bound states (ABSs) engineered in hybrid superconductor-semiconductor devices, where gate control offers key advantages. While strong Zeeman fields can induce such states, an alternative approach emerges through Andreev molecules -- closely spaced, coupled ABSs, also key building-block for Kitaev chain -- that enable topological behavior without high magnetic fields. However, existing Andreev molecules are controlled via magnetic flux in superconducting loops, limiting scalability. Here, we introduce a gate-controlled Andreev molecule, where electrostatic tuning of the density of states in one site nonlocally enhances the critical current of another. This eliminates superconducting loops, offering superior tunability, scalability, and sensitivity. We further extend such an Andreev molecule to a multi-site Kitaev chain, and a noninvasive sensor resolving single-Cooper-pair charge for parity readout. This platform bridges the gap between scalable ABS engineering and high-sensitivity quantum sensing, advancing the development for constructing and parity-readout in topological ABSs and long Kitaev chains towards topological qubits. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2508_04519 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Density of States (Gate) - Controlled Andreev Molecule and Sensor Shi, Xiaofan Dou, Ziwei Li, Guoan Pan, Dong Song, Yuxiao Wang, Anqi Zhang, Zhiyuan Guo, Xingchen Deng, Xiao Zhang, Ruixuan Xu, Liangqian Chen, Xiao Li, Yupeng Tong, Bingbing Song, Xiaohui Lyu, Zhaozheng Li, Peiling Qu, Fanming Liu, Guangtong Zhao, Jianhua Lu, Li Shen, Jie Mesoscale and Nanoscale Physics Superconductivity Quantum Physics Topological quantum computing typically relies on topological Andreev bound states (ABSs) engineered in hybrid superconductor-semiconductor devices, where gate control offers key advantages. While strong Zeeman fields can induce such states, an alternative approach emerges through Andreev molecules -- closely spaced, coupled ABSs, also key building-block for Kitaev chain -- that enable topological behavior without high magnetic fields. However, existing Andreev molecules are controlled via magnetic flux in superconducting loops, limiting scalability. Here, we introduce a gate-controlled Andreev molecule, where electrostatic tuning of the density of states in one site nonlocally enhances the critical current of another. This eliminates superconducting loops, offering superior tunability, scalability, and sensitivity. We further extend such an Andreev molecule to a multi-site Kitaev chain, and a noninvasive sensor resolving single-Cooper-pair charge for parity readout. This platform bridges the gap between scalable ABS engineering and high-sensitivity quantum sensing, advancing the development for constructing and parity-readout in topological ABSs and long Kitaev chains towards topological qubits. |
| title | Density of States (Gate) - Controlled Andreev Molecule and Sensor |
| topic | Mesoscale and Nanoscale Physics Superconductivity Quantum Physics |
| url | https://arxiv.org/abs/2508.04519 |