Dipole coupling of a double quantum dot to a microwave resonator

TL;DR

This paper demonstrates the coupling of a semiconductor double quantum dot to a superconducting microwave resonator, enabling potential scalable quantum information processing and high-resolution spectroscopy in solid-state systems.

Contribution

It introduces a hybrid approach to couple semiconductor quantum dots with superconducting resonators, advancing solid-state quantum coherence and scalable quantum computing architectures.

Findings

Dispersive frequency shifts reveal charge stability in double quantum dots.

Coupling enables high-resolution spectroscopy of quantum structures.

Potential for integrating multiple qubits on a single chip.

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.