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Related Experiment Videos

Josephson junction microscope for low-frequency fluctuators.

L Tian1, R W Simmonds

  • 1Department of Applied Physics and E. L. Ginzton Laboratory, Stanford University, Stanford, California 94305, USA. ltian@stanford.edu

Physical Review Letters
|October 13, 2007
PubMed
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A Josephson junction

Area of Science:

  • Quantum computing
  • Superconducting devices
  • Materials science

Background:

  • Josephson junctions are key components in superconducting quantum devices.
  • Spurious two-level systems (TLSs) in tunnel barriers cause decoherence, limiting device performance.
  • Understanding TLSs is crucial for improving superconducting quantum technologies.

Purpose of the Study:

  • To develop a novel method for probing spurious two-level systems (TLSs) in Josephson junctions.
  • To investigate the coupling mechanism between Josephson junctions and TLSs.
  • To explore the influence of external magnetic fields on TLS coupling.

Main Methods:

  • Utilizing the high-Q harmonic oscillator mode of a Josephson junction as a probe.
  • Performing spectroscopic transmission measurements of the junction resonator mode.

Related Experiment Videos

  • Applying an external magnetic field in the plane of the tunnel barrier.

    • Main Results:

    • Demonstrated that spectroscopic measurements can reveal TLS coupling magnitude variations.
    • Showed how TLS coupling changes with an in-plane magnetic field.
    • Identified a method to resolve the underlying coupling mechanism of spurious TLSs.

    Conclusions:

    • The proposed method effectively probes spurious TLSs in Josephson junctions.
    • This technique can elucidate the coupling mechanisms responsible for decoherence.
    • Resolving TLS coupling is vital for enhancing the quality of superconducting quantum devices.