Dipole coupling of a bilayer graphene quantum dot to a high-impedance microwave resonator

• URL: http://arxiv.org/abs/2312.14629v2
• Date: Mon, 29 Jan 2024 11:30:02 GMT
• Title: Dipole coupling of a bilayer graphene quantum dot to a high-impedance microwave resonator
• Authors: Max J. Ruckriegel, Lisa M. G\"achter, David Kealhofer, Mohsen Bahrami Panah, Chuyao Tong, Christoph Adam, Michele Masseroni, Hadrien Duprez, Rebekka Garreis, Kenji Watanabe, Takashi Taniguchi, Andreas Wallraff, Thomas Ihn, Klaus Ensslin, and Wei Wister Huang
• Abstract summary: superconducting microwave resonator with a double quantum dot electrostatically defined in a graphene-based van der Waals heterostructure. We achieve sensitive and fast detection with a signal-to-noise ratio of 3.5 within 1 $mumathrms$ integration time. Our results introduce cQED as a probe for quantum dots in van der Waals materials and indicate a path toward coherent charge-photon coupling with bilayer graphene quantum dots.
• Score: 0.14908922253160745
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: We implement circuit quantum electrodynamics (cQED) with quantum dots in bilayer graphene, a maturing material platform for semiconductor qubits that can host long-lived spin and valley states. The presented device combines a high-impedance ($Z_\mathrm{r} \approx 1 \mathrm{k{\Omega}}$) superconducting microwave resonator with a double quantum dot electrostatically defined in a graphene-based van der Waals heterostructure. Electric dipole coupling between the subsystems allows the resonator to sense the electric susceptibility of the double quantum dot from which we reconstruct its charge stability diagram. We achieve sensitive and fast detection with a signal-to-noise ratio of 3.5 within 1 ${\mu}\mathrm{s}$ integration time. The charge-photon interaction is quantified in the dispersive and resonant regimes by comparing the coupling-induced change in the resonator response to input-output theory, yielding a maximal coupling strength of $g/2{\pi} = 49.7 \mathrm{MHz}$. Our results introduce cQED as a probe for quantum dots in van der Waals materials and indicate a path toward coherent charge-photon coupling with bilayer graphene quantum dots.

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