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Cooling an Optically Trapped Ultracold Fermi Gas by Periodical Driving
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Subwavelength-width optical tunnel junctions for ultracold atoms.

F Jendrzejewski1, S Eckel2, T G Tiecke3,4

  • 1Kirchhoff Institut für Physik, Universität Heidelberg, Im Neuenheimer Feld 227, 69120 Heidelberg, Germany.

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|May 18, 2019
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Summary

Researchers developed a new method to create subwavelength optical barrier potentials for ultracold atoms. This technique allows for the creation of nanoscale barriers, enabling new possibilities in atomic physics and quantum information science.

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Area of Science:

  • Atomic, Molecular, and Optical Physics
  • Quantum Information Science
  • Condensed Matter Physics

Background:

  • Creating precise optical potentials for ultracold atoms is crucial for quantum simulations and information processing.
  • Existing methods are often limited by the diffraction limit, restricting the achievable feature sizes.

Purpose of the Study:

  • To propose and demonstrate a novel method for generating far-field optical barrier potentials with subwavelength widths.
  • To explore the application of these narrow potentials in many-body physics and quantum information protocols.

Main Methods:

  • Utilizing the nonlinear atomic response to control fields to create spatially varying dark resonances.
  • Engineering a geometric scalar potential experienced by atoms in these dark states.
  • Generating subwavelength optical barrier potentials narrower than the diffraction limit.

Main Results:

  • Successfully created optical barrier potentials with widths approaching tens of nanometers.
  • Demonstrated the feasibility of generating subwavelength features through nonlinear atomic effects.
  • The technique relies on the geometric scalar potential in spatially varying dark states.

Conclusions:

  • The proposed method offers unprecedented control over optical potentials for ultracold atoms.
  • This technique has significant implications for implementing quantum-information protocols, particularly for tunnel junctions.
  • Opens new avenues for studying many-body physics with nanoscale control.