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Related Experiment Video

Updated: Jun 23, 2026

Cooling an Optically Trapped Ultracold Fermi Gas by Periodical Driving

Cooling an Optically Trapped Ultracold Fermi Gas by Periodical Driving

Published on: March 30, 2017

Probing interactions between ultracold fermions.

G K Campbell¹, M M Boyd, J W Thomsen

¹JILA, National Institute of Standards and Technology and University of Colorado Department of Physics, University of Colorado, Boulder, CO 80309-0440, USA.

Science (New York, N.Y.)

|April 18, 2009

Summary

This summary is machine-generated.

Ultracold atomic clocks using fermionic strontium atoms unexpectedly showed density-dependent frequency shifts due to collisions. This research provides insights for improving atomic clock accuracy by addressing these quantum effects.

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Area of Science:

Atomic physics
Quantum optics
Metrology

Background:

The Pauli exclusion principle normally suppresses collisions between identical fermions at ultracold temperatures.
Fermionic isotopes are utilized in atomic clocks to leverage this collision suppression.
Atomic clocks are crucial for precise timekeeping and scientific measurements.

Purpose of the Study:

To investigate potential density-dependent collisional frequency shifts in optical atomic clocks utilizing fermionic strontium atoms.
To understand the underlying mechanisms causing these unexpected collisional effects.
To provide insights for mitigating or zeroing density shifts in future atomic clock designs.

Main Methods:

Probing an optical clock transition using thousands of lattice-confined, ultracold fermionic strontium atoms.
Systematic measurement of density-dependent collisional frequency shifts.
Theoretical modeling to explain the observed collision effects.

Main Results:

Observed significant density-dependent collisional frequency shifts in the optical clock transition.
Attributed these shifts to inhomogeneities in the probe excitation process, making atoms effectively distinguishable.
Quantified the magnitude of these collision-induced frequency shifts.

Conclusions:

Collisional frequency shifts can occur in fermionic atomic clocks despite the Pauli exclusion principle.
Inhomogeneities in excitation processes are a key factor in these observed shifts.
The findings offer crucial insights for developing more accurate and stable atomic clocks by managing density-dependent effects.