The current across one of these devices is equal to the critical current times the sine of the phase difference, while two of these devices are arranged in a superconducting loop in a DC SQUID.
Kulik and Omel'yanchuk developed refinements for metallic links in these objects, while thermal fluctuations in these objects can be analyzed with the Ambegaokar-Halperin model, and irradiating one of these devices gives rise to constant voltage Shapiro steps in them. They are characterized by the overdamped and underdamped regimes of the (*) RCSJ model, while semifluxons occur in their zero-pi long variety. Shadow evaporation can be used to create them for flux qubits, and their associated constant is equal to two times e over h, making it the reciprocal of the magnetic flux quantum. The current across one of these devices is equal to the critical current times the sine of the phase difference, while two of these devices are arranged in a superconducting loop in a DC SQUID. For 10 points, name these devices defined by the current flow across a non conducting barrier between two coupled superconductors. 
Kulik and Omel'yanchuk developed refinements for metallic links in these objects, while thermal fluctuations in these objects can be analyzed with the Ambegaokar-Halperin model, and irradiating one of these devices gives rise to constant voltage Shapiro steps in them.
{Josephson junction}