Charge shuttling in two-dimensional SiMOS quantum dot array for scalable quantum compute

Toward realization of a practical quantum computer, scalability of qubits is essential and still quite challenging. In order to overcome this technical challenge, we investigated a charge shuttling using the bucket brigade (BB) method in a two-dimensional quantum dot (QD) array with an isotopically purified silicon metal-oxide-semiconductor (SiMOS) [1]. QD array consist of horizontally-connected triple QDs, whose barrier height are controlled by barrier gates, and vertically-connected double QDs, whose barrier height are controlled by confinement gates. First, we measured charge stability diagram with charge sensor virtualization to identify voltage conditions of the plunger, barrier, and containment gates for BB shuttling. Using these conditions, we succeeded in observing the charge shuttling in two-dimensional QDs combining the horizontal charge shuttling by the plunger and barrier gates and vertical charge shuttling using the plunger and confinement gates.