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Fabrication and Characterization of Superconducting Resonators
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Utilizing Gate-Controlled Supercurrent for All-Metallic Tunable Superconducting Microwave Resonators.

Younghun Ryu1,2, Jinhoon Jeong1, Junho Suh3

  • 1Quantum Technology Institute, Korea Research Institute of Standards and Science (KRISS), Daejeon 34113, South Korea.

Nano Letters
|January 17, 2024
PubMed
Summary
This summary is machine-generated.

Researchers developed tunable superconducting resonators using titanium nitride nanowires. This gate-controlled supercurrent (GCS) effect allows precise frequency matching for hybrid quantum devices.

Keywords:
gate-controlled supercurrentkinetic inductancesuperconducting nanowiretunable microwave resonator

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Area of Science:

  • Quantum computing
  • Superconducting circuits
  • Materials science

Background:

  • Precise frequency matching is crucial for hybrid quantum systems.
  • Fabrication imperfections lead to deviations in resonator frequencies.
  • Quantum states like phonons are generally not tunable.

Purpose of the Study:

  • To demonstrate gate-tunable superconducting resonators.
  • To utilize the gate-controlled supercurrent (GCS) effect for frequency tuning.
  • To investigate the GCS effect's impact on resonator properties.

Main Methods:

  • Fabrication of titanium nitride (TiN)-based superconducting resonators with nanowire inductors.
  • Tuning resonator frequency via the gate-controlled supercurrent (GCS) effect.
  • Investigating resonator response under varying gate biases and temperatures.

Main Results:

  • Achieved 4% (∼150 MHz) frequency tuning in TiN resonators.
  • Observed a decrease in internal quality factors with tuning.
  • Provided evidence for phonon-related mechanisms in the GCS effect.

Conclusions:

  • The GCS effect offers an effective method for tuning superconducting resonators.
  • Locally tunable resonators are essential for advanced hybrid quantum devices.
  • This technique facilitates precise resonant coupling in quantum systems.