Dipole coupling of a bilayer graphene quantum dot to a high-impedance microwave resonator
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arXiv
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| Autores principales: | , , , , , , , , , , , , , , |
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| Formato: | Preprint |
| Publicado: |
2023
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| _version_ | 1866910870728081408 |
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| author | Ruckriegel, Max J. Gächter, Lisa M. Kealhofer, David Panah, Mohsen Bahrami Tong, Chuyao Adam, Christoph Masseroni, Michele Duprez, Hadrien Garreis, Rebekka Watanabe, Kenji Taniguchi, Takashi Wallraff, Andreas Ihn, Thomas Ensslin, Klaus Huang, Wei Wister |
| author_facet | Ruckriegel, Max J. Gächter, Lisa M. Kealhofer, David Panah, Mohsen Bahrami Tong, Chuyao Adam, Christoph Masseroni, Michele Duprez, Hadrien Garreis, Rebekka Watanabe, Kenji Taniguchi, Takashi Wallraff, Andreas Ihn, Thomas Ensslin, Klaus Huang, Wei Wister |
| contents | 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 ($Z_\mathrm{r} \approx 1 \mathrm{kΩ}$) 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 $μ\mathrm{s}$ 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 $g/2π = 49.7 \mathrm{MHz}$. 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2312_14629 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Dipole coupling of a bilayer graphene quantum dot to a high-impedance microwave resonator Ruckriegel, Max J. Gächter, Lisa M. Kealhofer, David Panah, Mohsen Bahrami Tong, Chuyao Adam, Christoph Masseroni, Michele Duprez, Hadrien Garreis, Rebekka Watanabe, Kenji Taniguchi, Takashi Wallraff, Andreas Ihn, Thomas Ensslin, Klaus Huang, Wei Wister Mesoscale and Nanoscale Physics Quantum Physics 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 ($Z_\mathrm{r} \approx 1 \mathrm{kΩ}$) 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 $μ\mathrm{s}$ 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 $g/2π = 49.7 \mathrm{MHz}$. 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. |
| title | Dipole coupling of a bilayer graphene quantum dot to a high-impedance microwave resonator |
| topic | Mesoscale and Nanoscale Physics Quantum Physics |
| url | https://arxiv.org/abs/2312.14629 |