Coupling a quantum dot, fermionic leads and a microwave cavity on-chip

TL;DR

This paper presents a hybrid quantum architecture coupling a carbon nanotube quantum dot with a microwave cavity, enabling potential circuit QED experiments with complex quantum dot systems.

Contribution

It introduces a novel on-chip hybrid system combining quantum dots, fermionic leads, and microwave cavities, with measured strong electron-photon coupling.

Findings

Achieved electron-photon coupling suitable for circuit QED

Demonstrated coupling in Coulomb blockade and Kondo regimes

Used nanotube quantum dots in superconducting microwave cavities

Abstract

We demonstrate a hybrid architecture consisting of a quantum dot circuit coupled to a single mode of the electromagnetic field. We use single wall carbon nanotube based circuits inserted in superconducting microwave cavities. By probing the nanotube-dot using a dispersive read-out in the Coulomb blockade and the Kondo regime, we determine an electron-photon coupling strength which should enable circuit QED experiments with more complex quantum dot circuits.