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Fabrication and Characterization of Superconducting Resonators
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Piezoelectric tunable microwave superconducting cavity.

N C Carvalho1, Y Fan1, M E Tobar1

  • 1School of Physics, The University of Western Australia, 35 Stirling Hwy, 6009 Crawley, Western Australia, Australia.

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|October 27, 2016
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We developed a superconducting tunable device for quantum systems. This 3D re-entrant cavity offers fine frequency tuning and high quality factors, crucial for quantum technologies.

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Area of Science:

  • Quantum Engineering
  • Superconducting Devices
  • Microwave Cavities

Background:

  • Engineered quantum systems require superconducting tunable devices.
  • High-quality factors at low photon numbers are essential for quantum applications.

Purpose of the Study:

  • To develop a 3D microwave re-entrant cavity with fine-tuning capabilities.
  • To achieve high-quality factors over a large dynamic range for quantum applications.

Main Methods:

  • Developed a 3D microwave re-entrant cavity.
  • Implemented a piezoelectric actuator for precise frequency tuning.
  • Conducted experiments at room and dilution refrigerator temperatures.

Main Results:

  • Achieved a large dynamic tuning range of up to 4 GHz (room temp) and 1 GHz (dilution fridge).
  • Observed nonlinear thermal effects impacting superconductivity at high microwave power.
  • Validated experimental data against finite element method simulations.

Conclusions:

  • The developed 3D re-entrant cavity meets the demand for tunable superconducting devices.
  • The piezoelectric tuning mechanism offers precise control over resonant frequency.
  • Understanding nonlinear thermal effects is critical for optimizing device performance at high power.