Low-Frequency Charge Noise in Bilayer Graphene Quantum Dots
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.
Related
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BibTeX
@misc{richter2026lowfrequency,
title = {{Low-Frequency Charge Noise in Bilayer Graphene Quantum Dots}},
author = {Jessica Richter and Max J. Ruckriegel and Jonas D. Gerber and Tijl Degroote and Christoph Adam and Markus Niese and Lara Ostertag and Clara Galante and Kenji Watanabe and Takashi Taniguchi and Petar Tomic and Artem O. Denisov and Hadrien Duprez and Klaus Ensslin and Thomas Ihn},
howpublished = {arXiv},
year = {2026},
month = sep,
doi = {10.48550/arxiv.2609.03650},
eprint = {2609.03650},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2609.03650},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - Low-Frequency Charge Noise in Bilayer Graphene Quantum Dots
AU - Jessica Richter
AU - Max J. Ruckriegel
AU - Jonas D. Gerber
AU - Tijl Degroote
AU - Christoph Adam
AU - Markus Niese
AU - Lara Ostertag
AU - Clara Galante
AU - Kenji Watanabe
AU - Takashi Taniguchi
AU - Petar Tomic
AU - Artem O. Denisov
AU - Hadrien Duprez
AU - Klaus Ensslin
AU - Thomas Ihn
PY - 2026
DA - 2026/09/03
PB - arXiv
DO - 10.48550/arxiv.2609.03650
UR - https://arxiv.org/abs/2609.03650
AB - 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.
ER -