Photon- and phonon-assisted tunneling in the three-dimensional charge stability diagram of a triple quantum dot array

TL;DR

This paper investigates photon- and phonon-assisted tunneling in a triple quantum dot array, emphasizing the importance of three-dimensional charge stability analysis for understanding qubit leakage and scaling effects.

Contribution

It provides a detailed analysis of tunneling transitions in a 3D charge stability diagram, highlighting their impact on qubit fidelity in quantum dot arrays.

Findings

Photon- and phonon-assisted tunneling observed

Transitions require 3D charge stability consideration

Implications for qubit leakage in scalable quantum systems

Abstract

We report both photon- and phonon-assisted tunneling transitions in a linear array of three quantum dots, which can only be understood by considering the full three-dimensionality of the charge stability diagram. Such tunneling transitions potentially contribute to leakage of qubits defined in this system. A detailed understanding of these transitions is important as they become more abundant and complex to analyze as quantum dot arrays are scaled up.