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Cooling an Optically Trapped Ultracold Fermi Gas by Periodical Driving
11:21

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Published on: March 30, 2017

p-Wave cold collisions in an optical lattice clock.

N D Lemke1, J von Stecher, J A Sherman

  • 1National Institute of Standards and Technology, Boulder, Colorado 80305, USA.

Physical Review Letters
|October 11, 2011
PubMed
Summary

Ultracold collisions in fermionic ytterbium atoms reveal p-wave interactions. Higher densities in 2D lattices suppress collision shifts, improving lattice clocks and quantum technologies.

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Area of Science:

  • Atomic physics
  • Quantum mechanics
  • Condensed matter physics

Background:

  • Ultracold atoms are crucial for precision measurements and quantum technologies.
  • Fermionic systems exhibit unique quantum statistical properties.
  • Collisions between atoms can introduce systematic errors in atomic clocks.

Purpose of the Study:

  • To investigate ultracold collisions in fermionic ytterbium.
  • To explore the role of Fermi statistics in atomic interactions.
  • To understand and mitigate collision-induced energy shifts in atomic clock states.

Main Methods:

  • Precise measurement of energy shifts in atomic clock states.
  • Utilizing two-dimensional lattice confinement for high atomic densities.
  • Exploiting Fermi statistics to identify collision types.

Main Results:

  • Discovery of p-wave collisions in both weakly and strongly interacting regimes.
  • Demonstration of novel suppression of collision shifts at high densities.
  • Quantification of energy shifts imparted by ultracold collisions.

Conclusions:

  • Ultracold collisions in fermionic ytterbium are characterized by p-wave interactions.
  • Two-dimensional lattice confinement enables suppression of collision shifts.
  • Findings reduce systematic errors in lattice clocks and advance quantum information and simulation.