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Quantum dynamics of a single vortex.

A Wallraff1, A Lukashenko, J Lisenfeld

  • 1Department of Applied Physics, Yale University, New Haven, Connecticut 06520, USA. andreas.wallraff@yale.edu

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|September 12, 2003
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Summary
This summary is machine-generated.

Researchers observed quantum tunneling in individual vortices within a superconducting Josephson junction. This demonstrates quantized energy levels and vortex tunneling through pinning barriers at low temperatures.

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Area of Science:

  • Quantum physics
  • Condensed matter physics
  • Superconductivity

Background:

  • Vortices are common in fluids and quantum systems like Bose-Einstein condensates and superconductors.
  • Quantized vortices are crucial for superconductor properties and device performance.
  • Previous studies on vortex dynamics at low temperatures focused on large collections, leaving individual vortex behavior unclear.

Purpose of the Study:

  • To investigate the quantum dynamics of an individual vortex in a superconducting Josephson junction.
  • To determine if quantum tunneling occurs for a single vortex at low temperatures.

Main Methods:

  • Studied vortex escape statistics from a controllable pinning potential.
  • Measured vortex energy levels within a trapping potential well.

Main Results:

  • Demonstrated the existence of quantized energy levels for an individual vortex.
  • Provided evidence of quantum tunneling of a single vortex through a pinning barrier.

Conclusions:

  • Individual vortices in superconducting Josephson junctions exhibit quantum behavior at low temperatures.
  • Quantum tunneling is a significant factor in the dynamics of single vortices in superconductors.