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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/2512.21213 |
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| _version_ | 1866917168995631104 |
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| author | Chiu, Kuei-Lin Lasrado, Avishma J. Lo, Cheng-Han Chen, Yen-Chih Shih, Shih-Po Lin, Yen-Hsiang Ke, Chung-Ting |
| author_facet | Chiu, Kuei-Lin Lasrado, Avishma J. Lo, Cheng-Han Chen, Yen-Chih Shih, Shih-Po Lin, Yen-Hsiang Ke, Chung-Ting |
| contents | We construct a series of graphene-based superconducting quantum circuits and integrate them into 3D cavities. For a single-qubit device, we demonstrate flux-tunable qubit transition, with a measured $T_1$ $\approx$ 48 ns and a lower bound estimate of $T_2^\ast$ $\approx$ 17.63 ns. By coupling the device to cavities with different resonant frequencies, we access multiple qubit-cavity coupling regimes, enabling the observation of vacuum Rabi splitting and flux-dependent spectral linewidths. In a two-qubit device consisting of a SQUID and a single junction, power-dependent measurements reveal a two-stage dispersive shift. By flux-tuning the cavity frequency at different readout powers, we attribute the first shift to the fixed-qubit and the second to the SQUID-qubit, indicating successful coupling between the two circuits and a single cavity mode. Our study demonstrates the flexible coupling achievable between 2D-material-based superconducting circuits and 3D cavities, and paves the way toward constructing multi-qubit 3D transmon devices from 2D materials. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2512_21213 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | 3D cavity-based graphene superconducting quantum circuits in two-qubit architectures Chiu, Kuei-Lin Lasrado, Avishma J. Lo, Cheng-Han Chen, Yen-Chih Shih, Shih-Po Lin, Yen-Hsiang Ke, Chung-Ting Quantum Physics Mesoscale and Nanoscale Physics We construct a series of graphene-based superconducting quantum circuits and integrate them into 3D cavities. For a single-qubit device, we demonstrate flux-tunable qubit transition, with a measured $T_1$ $\approx$ 48 ns and a lower bound estimate of $T_2^\ast$ $\approx$ 17.63 ns. By coupling the device to cavities with different resonant frequencies, we access multiple qubit-cavity coupling regimes, enabling the observation of vacuum Rabi splitting and flux-dependent spectral linewidths. In a two-qubit device consisting of a SQUID and a single junction, power-dependent measurements reveal a two-stage dispersive shift. By flux-tuning the cavity frequency at different readout powers, we attribute the first shift to the fixed-qubit and the second to the SQUID-qubit, indicating successful coupling between the two circuits and a single cavity mode. Our study demonstrates the flexible coupling achievable between 2D-material-based superconducting circuits and 3D cavities, and paves the way toward constructing multi-qubit 3D transmon devices from 2D materials. |
| title | 3D cavity-based graphene superconducting quantum circuits in two-qubit architectures |
| topic | Quantum Physics Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2512.21213 |