Dipole coupling of a double quantum dot to a microwave resonator

Abstract

Quantum coherence in solid-state systems has been demonstrated in superconducting circuits and in semiconductor quantum dots. This has paved the way to investigate solid-state systems for quantum information processing with the potential benefit of scalability compared to other systems based on atoms, ions and photons. Coherent coupling of superconducting circuits to microwave photons, circuit quantum electrodynamics (QED), has opened up new research directions and enabled long distance coupling of qubits. Here we demonstrate how the electromagnetic field of a superconducting microwave resonator can be coupled to a semiconductor double quantum dot. The charge stability diagram of the double dot, typically measured by direct current (DC) transport techniques, is investigated via dispersive frequency shifts of the coupled resonator. This hybrid all-solid-state approach offers the potential to coherently couple multiple quantum dot and superconducting qubits together on one chip, and offers a method for high resolution spectroscopy of semiconductor quantum structures.

5 pages, 4 figures

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• An in-situ tunable radio-frequency quantum point contact
• Characterization of a microwave frequency resonator via a nearby quantum dot
• Detecting single-electron tunneling involving virtual processes in real time
• Cavity quantum electrodynamics with semiconductor double-dot molecules on a chip

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