M. T. Bell, I. A. Sadovskyy, L. B. Ioffe, A. Yu. Kitaev, M. E. Gershenson
Many quantum devices operating at low temperatures would benefit from the development of the superinductor, a dissipationless superconducting element whose microwave impedance exceeds the resistance quantum $R_{Q}\text{\ensuremath{\equiv}}h/(2e)^{2}\text{\ensuremath{\approx}}6.5k\text{\textgreek{W}}$. We report on the realization of a superinductor as a ladder of nanoscale Josephson junctions, which can be frustrated by the magnetic field. The impedance of the proof-of-concept device is an order of magnitude larger than the state of the art. Both the inductance and its non-linearity can be tuned by a weak (~ 1 G) magnetic field. The strong non-linearity offers new types of functionality: possible applications of the superinductor include 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.
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http://arxiv.org/abs/1206.0307
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