ABSTRACT
Let us start with the simplest system of this kind, i.e., with a single Josephson junction closed with a superconducting loop (Figure 1). This circuit, first studied in the mid-1960s1–6 is usually called the single-junction superconducting quantum interferometer.† (a) Single-junction superconducting quantum interferometer and (b, c) its equivalent circuits. https://s3-euw1-ap-pe-df-pch-content-public-p.s3.eu-west-1.amazonaws.com/9781315141572/0ba78ca1-05bc-4a29-bdf3-856e8fbc4b17/content/fig6_1.tif" xmlns:xlink="https://www.w3.org/1999/xlink"/>
