A two-dimensional array of single-hole quantum dots*

Quantum dots fabricated using techniques and materials that are compatible with semiconductor manufacturing are promising for quantum information processing. While great progress has been made toward high-fidelity control of quantum dots positioned in a linear arrangement, scalability along two dimensions is a key step toward practical quantum information processing.
We created a two-dimensional quantum dot array where each quantum dot is tuned to single-charge
occupancy, verified by simultaneous measuring with two integrated radio frequency charge sensors. This was achieved by using planar germanium quantum dots with low disorder and small
effective mass, allowing the incorporation of dedicated barrier gates to control the coupling of the
quantum dots.

In this talk we will show result of experiments performed on such an array. For example, we demonstrate hole charge filling consistent with a Fock-Darwin spectrum and show that we can tune single-hole quantum dots from isolated quantum dots to strongly exchange coupled quantum dots. These results motivate the use of planar germanium quantum dots as building blocks for quantum simulation and computation.