## Quantum devices based on superconducting inductors

#### Alexei KitaevCalifornia Institute of TechnologyPhysics

I will discuss potential applications of a "superinductor" -- a sufficiently large superconducting inductor with relatively small capacitance, such that the characteristic impedance $\sqrt{L/C}$ is much greater than $h/(2e)2$. Such an element can be realized as a narrow strip of amorphous superconducting film. Superinductors, Josephson junctions, and capacitors can be used to construct a variety of interesting circuits, from a switch to a DC transformer to a qubit that features exponential protection from decoherence.