Radio-Frequency Charge Detection on Graphene Electron–Hole Double Quantum Dots
High-fidelity detection of charge transitions in quantum dots (QDs) is a key ingredient in solid-state quantum computation. We demonstrate high-bandwidth radio-frequency charge detection in bilayer graphene quantum dots (QDs) using a capacitively coupled quantum point contact (QPC). The device design suppresses screening effects and enables a sensitive QPC-based charge readout. The QPC is arranged to maximize the readout contrast between two neighboring coupled electron and hole QDs. We apply the readout scheme to a single-particle electron-hole double QD and demonstrate time-resolved detection of charge states as well as magnetic field dependent tunneling rates. This promises a high-fidelity readout scheme for individual spin and valley states, which is important for the operation of spin, valley, or spin-valley qubits in bilayer graphene.
Authors
- Christoph Stampfer (ORCID: https://orcid.org/0000-0002-4958-7362)
- L. Valerius (ORCID: https://orcid.org/0009-0005-9165-8880)
- Şeyda Duman
- Florian Libisch (ORCID: https://orcid.org/0000-0001-5641-9458)
- S. Möller (ORCID: https://orcid.org/0000-0002-6237-6762)
- Takashi Taniguchi (ORCID: https://orcid.org/0000-0002-1467-3105)
- Kenji Watanabe (ORCID: https://orcid.org/0000-0003-3701-8119)
- K. Hecker (ORCID: https://orcid.org/0000-0002-7398-8131)
- Christian Volk (ORCID: https://orcid.org/0000-0002-9527-317X)
- H. Dulisch
- Leon Stecher
- Tobias Deußen
- Saketh Ravuri
Institutions
- TU Wien (AT)
- Forschungszentrum Jülich (DE)
- National Institute for Materials Science (JP)
- Instituto de Física Teórica (ES)
- FZU ‒ Institute of Physics of the Academy of Sciences of the Czech Republic (CZ)
- RWTH Aachen University (DE)
Publication Details
- Journal
- Nano Letters
- Published
- 2025-12-12
- DOI
- https://doi.org/10.1021/acs.nanolett.5c04648
- Primary Topic
- Quantum and electron transport phenomena
- Type
- article
- Field-Weighted Citation Impact
- 0.00