Designing atomtronic circuits via superfluid dynamics

We propose to design atomtronic circuits with Bose-Einstein condensates (BECs) in circuit-like traps that are controlled via mobile barriers. Using classical-field simulations, we demonstrate a universal set of logical gates and show how to assemble them into circuits. We first demonstrate an gate based on a T-shaped BEC, utilizing a combination of mobile and static barriers. The mobile barriers provide the logical input of the gate, while the static barrier functions as a Josephson junction that generates the output of the gate via a density imbalance across the barrier. Next, we show how to combine three gates into a circuit, with a design composed of two T shapes and an H shape. Furthermore, we demonstrate how to use Josephson oscillations to create a gate and combine it with an gate, thereby showcasing a universal set of gates and their assembly into circuits.