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Related Experiment Videos

Controlling the cold collision shift in high precision atomic interferometry.

F Pereira Dos Santos1, H Marion, S Bize

  • 1BNM-SYRTE, Observatoire de Paris, 61 Avenue de l'Observatoire, 75014 Paris, France.

Physical Review Letters
|December 18, 2002
PubMed
Summary

We developed a new adiabatic passage technique to create cold atomic samples. This method precisely measures cold collision frequency shifts in cesium atomic clocks, enhancing accuracy evaluations.

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Area of Science:

  • Atomic physics
  • Quantum optics
  • Metrology

Background:

  • Precise control over cold atomic samples is crucial for high-accuracy atomic clocks.
  • Understanding cold collision effects is essential for improving clock performance.

Purpose of the Study:

  • To introduce a novel method for preparing cold atomic samples with controlled density and atom number.
  • To measure the cold collision frequency shift in a laser-cooled cesium clock.
  • To assess the potential for enhanced accuracy in atomic fountain clocks.

Main Methods:

  • Utilizing transfer of population by adiabatic passage to prepare cold atomic samples.
  • Employing laser cooling techniques for cesium atoms.
  • Performing precision measurements of frequency shifts in a cesium atomic clock.

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Main Results:

  • Successfully prepared cold atomic samples with a well-defined ratio of atomic density and atom number.
  • Measured the cold collision frequency shift in a laser-cooled cesium clock at the percent level.
  • Demonstrated the feasibility of evaluating cesium fountain accuracy at the 10⁻¹⁶ level.

Conclusions:

  • The adiabatic passage method offers a robust way to prepare cold atomic samples for precision measurements.
  • The technique enables accurate quantification of cold collision effects in atomic clocks.
  • Further improvements could lead to unprecedented precision in density-dependent phase shift measurements for high-precision experiments.