Fig. 1. Figures showing the concept and SEM pictures of the device. (a) A quantum ring without external magnetic field shield on the electron path. (b) The same figure viewed from the side. (c) A device that blocks an external magnetic field on the electron path using a superconducting gate (blue gate). (d) SEM picture of the device. Green and red gates are defining a quantum ring while green gates on either side of the ring tunes the coupling between quantum ring and the electron reservoir. The source and drain of the device are denoted as ‘S’ and ‘D’, respectively. The white gate noted as a “bridge” connects the inner red circular gate to the outer region of the device. (e) The side view of a bridge gate.
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