Suprajohtava tunneliliitos ja menetelmä sen valmistamiseksi

摘要

A micro-bridge type Josephson junction on a substrate (10) comprises a first superconducting layer (1), a second superconducting layer (2) arranged transversely over the first layer with an insulating layer (3) therebetween, and a weak link (4) between the first and second layers which is located in the insulating layer. In one embodiment, the insulating layer is formed by oxidizing the first layer prior to adding the second layer. The weak link is formed by directing a beam of high energy ions at the assembled layers, near the intersection of the inclined sides E1 and E2 of the first and second layers respectively. The ions penetrate the surface to form a band (5) which includes a localized region in the insulating layer having a reduced oxide concentration. This region acts as the weak link.