Low-Frequency Charge Noise in Bilayer Graphene Quantum Dots

• URL: http://arxiv.org/abs/2609.03650v1
• Date: Thu, 03 Sep 2026 10:49:50 GMT
• Title: Low-Frequency Charge Noise in Bilayer Graphene Quantum Dots
• Abstract summary: Bilayer graphene (BLG) quantum dots (QDs) are a promising platform for semiconductor qubits.<n>We characterize charge noise in gate-defined BLG QDs using transport-based noise spectroscopy.<n>Results validate BLG as a viable platform for coherent quantum information processing.
• Score: 0.9740495872065019
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Bilayer graphene (BLG) quantum dots (QDs) are a promising platform for semiconductor qubits. However, the low-frequency charge noise that may ultimately limit coherence has remained largely unexplored. Here, we systematically characterize charge noise in gate-defined BLG QDs using transport-based noise spectroscopy. We extract a median amplitude of $ S_μ^{1/2} (1~\text{Hz}) = 1.16~μ\text{eV}/\sqrt{\text{Hz}}$, placing BLG well within the range reported for established semiconductor quantum-dot platforms. Across variations in charge occupation, confinement, source-drain bias, and charge-sensor operating conditions, neither the noise amplitude nor the spectral dependence shows a reproducible trend in electrostatic tuning, indicating that we extracted the intrinsic semiconductor noise. Consistent noise levels are further observed in double QDs and confirmed using an independent superconducting resonator-based dispersive readout. Extending the study to BLG devices incorporating transition metal dichalcogenide layers reveals no measurable charge noise increase in weakly proximitized QDs. These results validate BLG as a viable platform for coherent quantum information processing.

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