Superconducting devices based on the coherent quantum phase slips

The experimental demonstration of the coherent quantum phase slip (CQPS) in superconductors has opened a new direction of fundamental research and application of quantum cryogenic electronics. The flux qubit with CQPS center, new phase-locking mechanism, and suppression of the flux tunneling, the Charge Quantum Interference Device, dual Shapiro steps, and Bloch transistor were demonstrated. In part, progress is due to the emergence of new superconducting materials with high kinetic inductance, NbN, InOx, TiN, and AlOx; mature nanotechnology of the fabrication of nanowires and nanoscale Josephson junctions of nm sizes; and efficient protection of them from environmental noise. We review recent progress with CQPS and discuss further development of superconducting materials with high kinetic inductance and the emergence of devices with new functionalities.