Radiofrequency Paul traps used in the quantum charge-coupled device architecture typically trap ions using a linear trap, where the rf rails and dc control electrodes that are used to confine the ions are spread out along a line and the ions line up along the axis of the trap. However, trapping ions in a two-dimensional grid enables more efficient sorting than in the more traditional linear traps. Junction transport is the process of moving an ion crystal through an intersection (or a junction) between two streets of a grid of linear Paul traps.