Quantum dot admittance probed at microwave frequencies with an on-chip resonator

Abstract

We present microwave frequency measurements of the dynamic admittance of a quantum dot tunnel coupled to a two-dimensional electron gas. The measurements are made via a high-quality 6.75 GHz on-chip resonator capacitively coupled to the dot. The resonator frequency is found to shift both down and up close to conductance resonance of the dot corresponding to a change of sign of the reactance of the system from capacitive to inductive. The observations are consistent with a scattering matrix model. The sign of the reactance depends on the detuning of the dot from conductance resonance and on the magnitude of the tunnel rate to the lead with respect to the resonator frequency. Inductive response is observed on a conductance resonance, when tunnel coupling and temperature are sufficiently small compared to the resonator frequency.

8 pages, 4 figures

References in corpus (8)

• Approaching Unit Visibility for Control of a Superconducting Qubit with Dispersive Readout
• Coplanar Waveguide Resonators for Circuit Quantum Electrodynamics
• Single-shot qubit readout in circuit Quantum Electrodynamics
• Single-shot qubit readout in circuit Quantum Electrodynamics
• Two-Qubit State Tomography using a Joint Dispersive Read-Out
• Mesoscopic Charge Relaxation
• Quantum inductance and negative electrochemical capacitance at finite frequency
• Detecting single-electron tunneling involving virtual processes in real time

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