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Related Experiment Videos

Superconducting single-charge transistor in a tunable dissipative environment.

F K Wilhelm1, G Schön, G T Zimányi

  • 1Institut für Theoretische Festkörperphysik, Universität Karlsruhe, D-76128 Karlsruhe, Germany.

Physical Review Letters
|October 3, 2001
PubMed
Summary

We investigated how a dissipative environment affects Cooper pair tunneling in superconducting transistors. Our findings reveal distinct "environment assisted" and "environment dominated" regimes, impacting quantum bit coherence.

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Area of Science:

  • Condensed matter physics
  • Quantum electronics

Background:

  • Superconducting single-charge transistors enable studies of quantum phenomena.
  • Cooper pair tunneling is sensitive to environmental interactions.
  • Dissipative environments can disrupt quantum coherence.

Purpose of the Study:

  • Analyze Cooper pair tunneling in a superconducting transistor coupled to a tunable dissipative environment.
  • Determine how dissipation and temperature influence conductance peak shapes.
  • Explain the observed crossover between environment-assisted and environment-dominated regimes.

Main Methods:

  • Theoretical analysis of sequential tunneling and cotunneling processes.
  • Modeling the superconducting single-charge transistor dynamics.
  • Comparison with experimental data on Josephson junction quantum bits.

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Main Results:

  • Developed a model for conductance peak shapes dependent on dissipation and temperature.
  • Identified a crossover between two distinct tunneling regimes.
  • Observed unexpected features in conductance peaks due to environmental coupling.

Conclusions:

  • The study provides a theoretical framework for understanding dissipation effects in superconducting devices.
  • The model explains experimental observations in Josephson junction quantum bits.
  • Dissipation significantly influences the coherence of quantum tunneling.