The 3D transport diagram of a triple quantum dot

TL;DR

This paper investigates the three-dimensional transport properties of a triple quantum dot, revealing that low-bias transport occurs only at six specific quadruple points, with findings aligning with an equivalent circuit model.

Contribution

It provides the first detailed experimental measurement of the 3D stability diagram of a triple quantum dot in a regime relevant for spin qubits.

Findings

Transport occurs only at six quadruple points at low bias.

Results match predictions from an equivalent circuit model.

Probing the interplay between transport and 3D stability diagram.

Abstract

We measure a triple quantum dot in the regime where three addition lines, corresponding to the addition of an electron to each of three dots, pass through each other. In particular, we probe the interplay between transport and the tridimensional nature of the stability diagram. We choose the regime most pertinent for spin qubit applications. We find that at low bias transport through the triple quantum dot circuit is only possible at six quadruple point locations. The results are consistent with an equivalent circuit model.