Radio-frequency charge detection on graphene electron-hole double quantum dots

• URL: http://arxiv.org/abs/2509.12061v2
• Date: Fri, 07 Nov 2025 23:06:14 GMT
• Title: Radio-frequency charge detection on graphene electron-hole double quantum dots
• Authors: Katrin Hecker, Samuel Möller, Hubert Dulisch, Şiyar Duman, Leon Stecher, Lucca Valerius, Tobias Deußen, Saketh Ravuri, Kenji Watanabe, Takashi Taniguchi, Florian Libisch, Christian Volk, Christoph Stampfer,
• Abstract summary: High-fidelity detection of charge transitions in quantum dots (QDs) is a key ingredient in solid state quantum computation.<n>We demonstrate high-bandwidth radio-frequency charge detection in bilayer graphene quantum dots (QDs) using a capacitively coupled quantum point contact (QPC)<n>The device design suppresses screening effects and enables sensitive QPC-based charge readout.
• Score: 1.0163986917141687
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: 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 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.

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