A process for manufacturing a Josephson junction comprising: - a step for providing a substrate, extending along a first direction, a so-called longitudinal direction, - a step for depositing a superconducting layer on the substrate so that this layer extends from the substrate in a second direction, a so-called transverse direction, perpendicular to the longitudinal direction, and - a step for irradiation of ions in a central area of the layer defined in the longitudinal direction, the process being characterized in that one of the following properties is fulfilled: - a first property according to which the process includes, prior to the irradiation step a step for removing a portion of the central area of the superconducting layer so as to delimit a set of areas (20, 22, 24) of the superconducting layer aligned in the longitudinal direction including the central area and two lateral areas (20, 22), the central area being positioned between both lateral areas (20, 22) and having a dimension in the transverse direction smaller than the dimension (I20, I22) of each lateral area (20, 22) in this same transverse direction, and - a second property according to which the process includes a step for irradiation of ions in the central area of the superconducting layer so as to form two areas (300, 302) aligned along the transverse direction, one of both areas (300, 302) being in an insulating material and the other area in a conducting material, and so as to delimit a set of areas (20, 22, 24) of the superconducting layer aligned in the longitudinal direction including the central area and two lateral areas (20, 22), the central area being positioned between both lateral areas (20, 22), the area in a conducting material of the central area having a dimension in the transverse direction smaller than the dimension (I20, 122) of each lateral area (20, 22) in this same transverse direction. - a step for providing a substrate, extending along a first direction, a so-called longitudinal direction, - a step for depositing a superconducting layer on the substrate so that this layer extends from the substrate in a second direction, a so-called transverse direction, perpendicular to the longitudinal direction, and - a step for irradiation of ions in a central area of the layer defined in the longitudinal direction, the process being characterized in that one of the following properties is fulfilled: - a first property according to which the process includes, prior to the irradiation step a step for removing a portion of the central area of the superconducting layer so as to delimit a set of areas (20, 22, 24) of the superconducting layer aligned in the longitudinal direction including the central area and two lateral areas (20, 22), the central area being positioned between both lateral areas (20, 22) and having a dimension in the transverse direction smaller than the dimension (I20, I22) of each lateral area (20, 22) in this same transverse direction, and - a second property according to which the process includes a step for irradiation of ions in the central area of the superconducting layer so as to form two areas (300, 302) aligned along the transverse direction, one of both areas (300, 302) being in an insulating material and the other area in a conducting material, and so as to delimit a set of areas (20, 22, 24) of the superconducting layer aligned in the longitudinal direction including the central area and two lateral areas (20, 22), the central area being positioned between both lateral areas (20, 22), the area in a conducting material of the central area having a dimension in the transverse direction smaller than the dimension (I20, 122) of each lateral area (20, 22) in this same transverse direction. - a first property according to which the process includes, prior to the irradiation step a step for removing a portion of the central area of the superconducting layer so as to delimit a set of areas (20, 22, 24) of the superconducting layer aligned in the longitudinal direction including the central area and two lateral areas (20, 22), the central area being positioned between both lateral areas (20, 22) and having a dimension in the transverse direction smaller than the dimension (I20, I22) of each lateral area (20, 22) in this same transverse direction, and - a second property according to which the process includes a step for irradiation of ions in the central area of the superconducting layer so as to form two areas (300, 302) aligned along the transverse direction, one of both areas (300, 302) being in an insulating material and the other area in a conducting material, and so as to delimit a set of areas (20, 22, 24) of the superconducting layer aligned in the longitudinal direction including the central area and two lateral areas (20, 22), the central area being positioned between both lateral areas (20, 22), the area in a conducting material of the central area having a dimension in the transverse direction smaller than the dimension (I20, 122) of each lateral area (20, 22) in this same transverse direction.