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Towards understanding two-level-systems in amorphous solids: insights from quantum circuits.

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Amorphous solids exhibit universal low-temperature behavior explained by two-level defects (TLS). Recent advances in superconducting circuits allow probing individual TLS, advancing solid-state physics understanding.

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Area of Science:

  • Solid-state physics
  • Quantum computing

Background:

  • Amorphous solids display universal low-temperature behavior.
  • The standard tunneling model attributes this to two-level defects (TLS), but their nature remains unclear.
  • TLS cause losses in superconducting circuits, limiting quantum technologies.

Purpose of the Study:

  • To review recent experimental findings on TLS in amorphous solids.
  • To discuss theoretical models explaining TLS behavior.
  • To highlight the role of superconducting circuits in studying TLS.

Main Methods:

  • Probing individual defects in superconducting circuits.
  • Observing quantum dynamics of TLS.
  • Analyzing defect behavior under varying conditions (field, strain, temperature).

Main Results:

  • Recent experiments provide new insights into TLS.
  • Superconducting circuits enable detailed study of individual TLS.
  • Various theoretical models are being tested against experimental data.

Conclusions:

  • Understanding TLS is crucial for advancing solid-state physics and quantum technologies.
  • Superconducting circuits offer a powerful platform for TLS research.
  • Continued investigation is needed to fully elucidate the nature and behavior of TLS.