Charge Number Dependence of the Dephasing Rates of a Graphene Double Quantum Dot in a Circuit QED Architecture

Abstract

We use an on-chip superconducting resonator as a sensitive meter to probe the properties of graphene double quantum dots at microwave frequencies. Specifically, we investigate the charge dephasing rates in a circuit quantum electrodynamics architecture. The dephasing rates strongly depend on the number of charges in the dots, and the variation has a period of four charges, over an extended range of charge numbers. Although the exact mechanism of this fourfold periodicity in dephasing rates is an open problem, our observations hint at the fourfold degeneracy expected in graphene from its spin and valley degrees of freedom.

References in corpus (14)

• The electronic properties of graphene
• Spin qubits in graphene quantum dots
• Circuit Quantum Electrodynamics with a Spin Qubit
• Edge disorder induced Anderson localization and conduction gap in graphene nanoribbons
• Quantum control and process tomography of a semiconductor quantum dot hybrid qubit
• Photon Emission from a Cavity-Coupled Double Quantum Dot
• Photon mediated interaction between distant quantum dot circuits
• Fast coherent manipulation of three-electron states in a double quantum dot
• Out of equilibrium charge dynamics in a hybrid cQED architecture
• Quantum dot admittance probed at microwave frequencies with an on-chip resonator
• Tunable Hybrid Quantum Electrodynamics from Non-Linear Electron Transport
• Singlet-Triplet Physics and Shell Filling in Carbon Nanotube Double Quantum Dots
• Evaluating charge noise acting on semiconductor quantum dots in the circuit quantum electrodynamics architecture
• Symmetric reflection line resonator for semiconductor circuit quantum electrodynamics

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