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Different approach for evaluating dissipation in macroscopic quantum tunneling.

A Agresti1, M Barilli, A Ranfagni

  • 1Dipartimento di Fisica dell'Università di Firenze, Sezione di Fisica Superiore, and Istituto Nazionale di Fisica della Materia, Unità di Ricerca di Firenze, Florence, Italy.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|August 22, 2002
PubMed
Summary

This study re-examines dissipative effects in macroscopic quantum tunneling for Josephson junctions. A new theoretical model, validated numerically and analytically, offers a clearer understanding of traversal time in these quantum systems.

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Area of Science:

  • Quantum physics
  • Condensed matter physics
  • Superconductivity

Background:

  • Macroscopic quantum tunneling (MQT) is a key phenomenon in superconducting devices.
  • Evaluating dissipative effects on MQT is crucial for device performance.
  • Existing theoretical approaches present contradictions and require re-evaluation.

Purpose of the Study:

  • To re-examine dissipative effects in macroscopic quantum tunneling.
  • To propose an alternative theoretical model for Josephson junctions.
  • To resolve contradictions in previous approaches.

Main Methods:

  • Analysis of a Josephson junction coupled to a transmission line.
  • Application of both analytical and numerical methods.
  • Validation against available experimental results using a traversal time criterion.

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Main Results:

  • A novel theoretical framework for evaluating dissipative effects in MQT.
  • Consistent analytical and numerical results.
  • Model validation against experimental data shows agreement.

Conclusions:

  • The proposed model provides a consistent and accurate method for assessing dissipation in MQT.
  • This work clarifies the role of dissipation in Josephson junction dynamics.
  • The traversal time criterion proves effective for model validation.