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| Main Authors: | , , , , , , , , , , |
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| Format: | Preprint |
| Published: |
2026
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2603.18666 |
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| _version_ | 1866910059469996032 |
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| author | Xu, Yong-Qiang Wu, Rui Gu, Si-Si Jiang, Shun-Li Ye, Shu-Kun Wang, Bao-Chuan Li, Hai-Ou Guo, Guang-Can Zou, Chang-Ling Cao, Gang Guo, Guo-Ping |
| author_facet | Xu, Yong-Qiang Wu, Rui Gu, Si-Si Jiang, Shun-Li Ye, Shu-Kun Wang, Bao-Chuan Li, Hai-Ou Guo, Guang-Can Zou, Chang-Ling Cao, Gang Guo, Guo-Ping |
| contents | In microwave-based quantum circuits, including double quantum dots (DQDs), superconducting qubits and spin qubits, parametric amplifiers are indispensable in achieving high-fidelity qubit readouts. Despite its importance, the application of parametric amplifiers is hampered by several challenges, such as high insertion losses, constrained tunability, and a pronounced vulnerability to magnetic fields. Here, we demonstrate an on-site single-atom parametric amplifier (SAPA) within a reconfigurable quantum circuit, which consists of a superconducting microwave cavity and two GaAs gate-defined DQDs. Leveraging the inherent nonlinearity of the DQD, a parametric gain exceeding 11 dB is achieved. This gain contributes to enhance the qubit readout, as evidenced by exceeding two times improvement in the signal-to-noise ratio (SNR) when employing the DQD-based amplifier for reading out another DQD. Our work not only presents a versatile experimental platform with enhanced readout capabilities in quantum computing, but also introduces alternative choices of parametric amplifiers for a variety of microwave-based quantum circuits. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2603_18666 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | On-chip Parametric Amplification in a Double Quantum Dots Circuit Xu, Yong-Qiang Wu, Rui Gu, Si-Si Jiang, Shun-Li Ye, Shu-Kun Wang, Bao-Chuan Li, Hai-Ou Guo, Guang-Can Zou, Chang-Ling Cao, Gang Guo, Guo-Ping Quantum Physics In microwave-based quantum circuits, including double quantum dots (DQDs), superconducting qubits and spin qubits, parametric amplifiers are indispensable in achieving high-fidelity qubit readouts. Despite its importance, the application of parametric amplifiers is hampered by several challenges, such as high insertion losses, constrained tunability, and a pronounced vulnerability to magnetic fields. Here, we demonstrate an on-site single-atom parametric amplifier (SAPA) within a reconfigurable quantum circuit, which consists of a superconducting microwave cavity and two GaAs gate-defined DQDs. Leveraging the inherent nonlinearity of the DQD, a parametric gain exceeding 11 dB is achieved. This gain contributes to enhance the qubit readout, as evidenced by exceeding two times improvement in the signal-to-noise ratio (SNR) when employing the DQD-based amplifier for reading out another DQD. Our work not only presents a versatile experimental platform with enhanced readout capabilities in quantum computing, but also introduces alternative choices of parametric amplifiers for a variety of microwave-based quantum circuits. |
| title | On-chip Parametric Amplification in a Double Quantum Dots Circuit |
| topic | Quantum Physics |
| url | https://arxiv.org/abs/2603.18666 |