We report on the realization of a superinductor, a dissipationless element whose microwave impedance greatly exceeds the resistance quantum. The design of the superinductor, implemented as a ladder of nanoscale Josephson junctions, enables tuning of the inductance and its nonlinearity by a weak magnetic field. The Rabi decay time of the superinductor-based qubit exceeds 1 microsecond. The high kinetic inductance and strong nonlinearity offer new types of functionality, including the development of qubits protected from both flux and charge noises, fault tolerant quantum computing, and high-impedance isolation for electrical current standards based on Bloch oscillations.
@article{arxiv.1206.0307,
title = {Quantum Superinductor with Tunable Non-Linearity},
author = {M. T. Bell and I. A. Sadovskyy and L. B. Ioffe and A. Yu. Kitaev and M. E. Gershenson},
journal= {arXiv preprint arXiv:1206.0307},
year = {2013}
}