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Radio-Frequency Charge Detection on Graphene Electron-Hole Double Quantum Dots
K Hecker1,2, S Möller1,2, H Dulisch1,2
1JARA-FIT and 2nd Institute of Physics, RWTH Aachen University, 52074 Aachen, Germany.
Nano Letters
|December 13, 2025
Summary
We developed a high-bandwidth radio-frequency charge detection method for bilayer graphene quantum dots (QDs). This technique enables sensitive readout of charge states, crucial for quantum computation.
Area of Science:
- Quantum Information Science
- Condensed Matter Physics
- Materials Science
Background:
- High-fidelity charge detection is essential for advancing solid-state quantum computation.
- Bilayer graphene quantum dots (QDs) offer a promising platform for hosting qubits.
Purpose of the Study:
- To demonstrate a high-bandwidth radio-frequency charge detection scheme for bilayer graphene QDs.
- To enable sensitive readout of charge states for potential spin and valley qubit operations.
Main Methods:
- Utilized a capacitively coupled quantum point contact (QPC) for charge detection.
- Designed the QPC to minimize screening effects and maximize readout contrast.
- Applied the scheme to a single-particle electron-hole double QD.
Main Results:
- Achieved high-bandwidth radio-frequency charge detection in bilayer graphene QDs.
- Demonstrated time-resolved detection of charge states.
- Observed magnetic field dependent tunneling rates.
Conclusions:
- The developed QPC-based readout scheme offers high fidelity for detecting charge transitions.
- This method is vital for the operation of spin, valley, or spin-valley qubits in bilayer graphene.
- Promises advancements in quantum information processing using graphene-based quantum dots.
