3D cavity-based graphene superconducting quantum circuits in two-qubit architectures

• URL: http://arxiv.org/abs/2512.21213v1
• Date: Wed, 24 Dec 2025 14:56:10 GMT
• Title: 3D cavity-based graphene superconducting quantum circuits in two-qubit architectures
• Authors: Kuei-Lin Chiu, Avishma J. Lasrado, Cheng-Han Lo, Yen-Chih Chen, Shih-Po Shih, Yen-Hsiang Lin, Chung-Ting Ke,
• Abstract summary: We construct a series of graphene-based superconducting quantum circuits and integrate them into 3D cavities.<n>Our study demonstrates the flexible coupling achievable between 2D-material-based superconducting circuits and 3D frequencies.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: 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.

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