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Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform
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Tunable superconducting nanoinductors.

Anthony J Annunziata1, Daniel F Santavicca, Luigi Frunzio

  • 1Department of Applied Physics, Yale University, New Haven, CT 06511, USA. anthony.annunziata@yale.edu

Nanotechnology
|October 6, 2010
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Summary

Researchers developed superconducting nanowire inductors using niobium and niobium nitride. These ultra-thin inductive elements exhibit large kinetic inductance, crucial for microwave superconducting circuits.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Electrical Engineering

Background:

  • Superconducting circuits require efficient inductive elements.
  • Kinetic inductance in superconducting materials offers a pathway to miniaturization.

Purpose of the Study:

  • To characterize inductors fabricated from ultra-thin niobium (Nb) and niobium nitride (NbN) nanowires.
  • To investigate the kinetic inductance properties of these nanowires and their dependence on length, temperature, and current.
  • To simulate the self-resonant frequencies of these nanowires in a compact meander geometry for microwave applications.

Main Methods:

  • Fabrication of ultra-thin (approx. 100 nm wide) Nb and NbN nanowire inductors.
  • Measurement of kinetic inductance as a function of nanowire length, temperature (2.5 K), and current.
  • Comparison of experimental results with theoretical predictions.
  • Simulation of self-resonant frequencies in meander geometries.

Main Results:

  • NbN and Nb nanowires exhibit significant kinetic inductance in the superconducting state.
  • Kinetic inductance scales linearly with nanowire length (1 nH µm(-1) for NbN, 44 pH µm(-1) for Nb at 2.5 K).
  • Temperature and current dependence of kinetic inductance were measured and compared to theory.
  • Simulations predict viable self-resonant frequencies for meandered nanowires.

Conclusions:

  • Ultra-thin Nb and NbN nanowires are promising candidates for high-performance inductive elements in superconducting circuits.
  • The linear scaling of kinetic inductance with length allows for tunable inductance values.
  • These nanowire inductors have potential applications in various microwave frequency superconducting circuits.