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Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform
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Quantum phase diffusion in a small underdamped Josephson junction.

H F Yu1, X B Zhu, Z H Peng

  • 1Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, China.

Physical Review Letters
|September 10, 2011
PubMed
Summary
This summary is machine-generated.

Quantum phase diffusion in superconducting junctions is studied. Macroscopic quantum tunneling significantly enhances transition rates at low temperatures, deviating from classical predictions.

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Area of Science:

  • Condensed Matter Physics
  • Quantum Mechanics
  • Superconductivity

Background:

  • Understanding quantum phase diffusion is crucial for superconducting devices.
  • Macroscopic quantum tunneling (MQT) influences escape mechanisms in underdamped Josephson junctions.

Purpose of the Study:

  • To demonstrate and characterize quantum phase diffusion in a small underdamped Nb/AlOx/Nb junction.
  • To propose and validate a two-step transition model for the switching process.

Main Methods:

  • Experimental investigation of a Nb/AlOx/Nb junction across a temperature range of 25-140 mK.
  • Analysis of switching current distributions to extract transition rates.
  • Comparison of experimental data with theoretical models, including Arrhenius law and MQT effects.

Main Results:

  • Quantum phase diffusion was observed in the underdamped junction.
  • The two-step transition model effectively describes the switching process.
  • Transition rates showed enhancement due to MQT, deviating from the thermal regime predictions.

Conclusions:

  • MQT is the dominant escape mechanism in the studied temperature range.
  • The proposed model accurately captures the transition dynamics influenced by quantum effects.
  • Experimental findings provide insights into quantum phenomena in superconducting circuits.