Charge sensing of few-electron ZnO double quantum dots probed by radio-frequency reflectometry
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| Main Authors: | , , , , , , , , |
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| Format: | Preprint |
| Published: |
2025
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| _version_ | 1866912181871706112 |
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| author | Noro, Kosuke Shinozaki, Motoya Kozuka, Yusuke Matsumura, Kazuma Fujiwara, Yoshihiro Kumasaka, Takeshi Tsukazaki, Atsushi Kawasaki, Masashi Otsuka, Tomohiro |
| author_facet | Noro, Kosuke Shinozaki, Motoya Kozuka, Yusuke Matsumura, Kazuma Fujiwara, Yoshihiro Kumasaka, Takeshi Tsukazaki, Atsushi Kawasaki, Masashi Otsuka, Tomohiro |
| contents | Zinc oxide (ZnO) has garnered much attention as a promising material for quantum devices due to its unique characteristics. To utilize the potential of ZnO for quantum devices, the development of fundamental technological elements such as high-speed readout and charge sensing capabilities has become essential. In this study, we address these challenges by demonstrating radio-frequency (rf) reflectometry and charge sensing in ZnO quantum dots, thus advancing the potential for qubit applications. A device is fabricated on a high-quality ZnO heterostructure, featuring gate-defined target and sensor quantum dots. The sensor dot, integrated into an rf resonator circuit, enables the detection of single-electron charges in the target dots. Using this setup, the formation of few-electron double quantum dots is observed by obtaining their charge stability diagram. Also, a charge stability diagram with a gate pulse sequence is measured. We discuss the strong electron correlation in ZnO, which leads to nearly degenerate spin-singlet and -triplet two-electron states in the (0, 2) charge state, and the perspectives on spin-state readout. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2501_04949 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Charge sensing of few-electron ZnO double quantum dots probed by radio-frequency reflectometry Noro, Kosuke Shinozaki, Motoya Kozuka, Yusuke Matsumura, Kazuma Fujiwara, Yoshihiro Kumasaka, Takeshi Tsukazaki, Atsushi Kawasaki, Masashi Otsuka, Tomohiro Mesoscale and Nanoscale Physics Zinc oxide (ZnO) has garnered much attention as a promising material for quantum devices due to its unique characteristics. To utilize the potential of ZnO for quantum devices, the development of fundamental technological elements such as high-speed readout and charge sensing capabilities has become essential. In this study, we address these challenges by demonstrating radio-frequency (rf) reflectometry and charge sensing in ZnO quantum dots, thus advancing the potential for qubit applications. A device is fabricated on a high-quality ZnO heterostructure, featuring gate-defined target and sensor quantum dots. The sensor dot, integrated into an rf resonator circuit, enables the detection of single-electron charges in the target dots. Using this setup, the formation of few-electron double quantum dots is observed by obtaining their charge stability diagram. Also, a charge stability diagram with a gate pulse sequence is measured. We discuss the strong electron correlation in ZnO, which leads to nearly degenerate spin-singlet and -triplet two-electron states in the (0, 2) charge state, and the perspectives on spin-state readout. |
| title | Charge sensing of few-electron ZnO double quantum dots probed by radio-frequency reflectometry |
| topic | Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2501.04949 |