Circulation transfer in adjacent ring Bose-Einstein condensates*

We have studied the possibility of transferring circulation between two adjacent ring Bose-Einstein condensates (BECs) by applying a barrier potential along the line joining the centers of the ring potentials. Two BECs are created next to each other and circulation is induced in one of them by phase imprint. A radial barrier potential is then applied to create a low-density channel between the interiors of the two ring BECs. This can, in principle, enable a vortex trapped in the circulating ring BEC to migrate to the other condensate interior. This should cause the flow to transfer from one condensate to the other. We have simulated this procedure using the 2D and 3D Gross-Pitaevskii equations with dissipation. We have also simulated this system with the ZNG model to investigate the effectiveness of a thermal cloud as a dissipation mechanism. This system can be used for acceleration and rotation sensing. As part of an array of ring BECs it can be used for quantum information applications.