Abstract: This device or junction is essentially constituted by a substrate made from an electrically insulating material (2), a vertical wall (4) formed on the substrate and extending in a given direction (x), said wall being made from said insulating material, a superconducting material ribbon (8) in two separate parts (10, 12) located on either side of the wall and bearing on the latter, the ribbon being oriented in a direction perpendicular to the said direction, and two interconnection contacts (14, 16) respectively placed on the two portions of the ribbon.