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Fabrication and Characterization of Superconducting Resonators
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Self-Calibrating Superconducting Pair-Breaking Detector.

E T Mannila1, V F Maisi2, J P Pekola1

  • 1QTF Centre of Excellence, Department of Applied Physics, Aalto University, FI-00076 Aalto, Finland.

Physical Review Letters
|October 15, 2021
PubMed
Summary
This summary is machine-generated.

We developed a self-calibrating detector for Cooper pair breaking in superconductors. This device counts single electrons per broken pair, enabling sensitive measurements of low power events.

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Area of Science:

  • Condensed Matter Physics
  • Superconductivity
  • Quantum Electronics

Background:

  • Cooper pair depairing is a critical phenomenon in superconductors.
  • Detecting subtle energy dissipation, like high-frequency phonons, remains challenging.

Purpose of the Study:

  • To propose and demonstrate a novel self-calibrating detector for Cooper pair depairing.
  • To enable sensitive measurements of low-power dissipation in superconducting devices.

Main Methods:

  • Fabrication of a mesoscopic superconducting island coupled to normal metal leads.
  • Utilizing single-electron transport for detecting broken Cooper pairs.
  • Analytical modeling and numerical simulations for device characterization.
  • Experimental validation with proof-of-concept phonon detection.

Main Results:

  • Demonstrated a self-calibrating detector with single-electron sensitivity per depairing event.
  • Achieved quantitative agreement between analytical models, simulations, and experimental data.
  • Successfully measured high-frequency phonons from a decoupled superconducting source (<10 fW).

Conclusions:

  • The proposed detector offers a robust and parameter-independent method for Cooper pair depairing detection.
  • This technology opens avenues for highly sensitive measurements in quantum electronics and low-dissipation physics.