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Related Experiment Videos

Quantum fluctuations in Josephson junction comparators.

Thomas J Walls1, Timur V Filippov, Konstantin K Likharev

  • 1Department of Physics and Astronomy, Stony Brook University, Stony Brook, New York 11974-3800, USA.

Physical Review Letters
|November 22, 2002
PubMed
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We developed a new method to calculate quantum fluctuations in damped harmonic oscillators. This method accurately predicts the gray zone width in Josephson junction comparators, matching experimental data without fitting parameters.

Area of Science:

  • Quantum mechanics
  • Condensed matter physics
  • Superconductivity

Background:

  • Quantum fluctuation effects are crucial in systems like damped harmonic oscillators.
  • Understanding the uncertainty zone at potential curvature sign inversion is key.
  • The Caldeira-Leggett model provides a framework for studying these effects.

Purpose of the Study:

  • To develop a novel method for calculating quantum fluctuation effects.
  • To apply this method to Josephson-junction balanced comparators.
  • To investigate the temperature dependence of the gray zone width (ΔIx).

Main Methods:

  • Developed a calculation method for quantum fluctuations in damped harmonic oscillators.
  • Incorporated arbitrary time dependence of frequency and temperature.

Related Experiment Videos

  • Utilized the Caldeira-Leggett model.

    • Main Results:

    • Successfully applied the method to calculate the gray zone width (ΔIx) of Josephson-junction balanced comparators.
    • Calculated temperature dependence of ΔIx from 1.5 to 4.2 K.
    • Achieved excellent agreement with experimental data for Nb-trilayer comparators (1.0 and 5.5 kA/cm²) without fitting parameters.

    Conclusions:

    • The developed method accurately quantifies quantum fluctuation effects.
    • The findings validate the theoretical approach for superconducting devices.
    • This work provides a parameter-free prediction for comparator behavior.