High Kinetic Inductance NbN Nanowire Superinductors

2018/02/05 by David Niepce, Jonathan Burnett, Jonas Bylander · 1 citation
Physics and Astronomy · #cond-mat.mes-hall

paper · pdf · doi:10.1103/physrevapplied.11.044014

published as Phys. Rev. Applied 11, 044014 (2019)

arxiv created 2018/02/05 · arxiv updated 2019/04/10

Abstract

We demonstrate that a high kinetic inductance disordered superconductor can realize a low microwave loss, non-dissipative circuit element with an impedance greater than the quantum resistance (R_Q = h/4e² ≃ 6.5kΩ). This element, known as a superinductor, can produce a quantum circuit where charge fluctuations are suppressed. The superinductor consists of a 40 nm wide niobium nitride nanowire and exhibits a single photon quality factor of 2.5 × 10⁴. Furthermore, by examining loss rates, we demonstrate that the dissipation of our nanowire devices can be fully understood in the framework of two-level system loss.

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