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Updated: Aug 27, 2025

Cooling an Optically Trapped Ultracold Fermi Gas by Periodical Driving

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Published on: March 30, 2017

Subrecoil Clock-Transition Laser Cooling Enabling Shallow Optical Lattice Clocks.

X Zhang^1,2, K Beloy¹, Y S Hassan^1,2

¹National Institute of Standards and Technology, 325 Broadway, Boulder, Colorado 80305, USA.

Physical Review Letters

|September 26, 2022

Summary

This summary is machine-generated.

This study demonstrates a new laser cooling technique for ytterbium atoms, achieving ultracold temperatures in the nanokelvin regime. This method significantly enhances precision for atomic clocks and quantum control applications.

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Area of Science:

Atomic Physics
Quantum Control
Laser Cooling

Background:

Divalent atoms typically use two-stage Doppler cooling to reach microkelvin temperatures.
Achieving ultracold temperatures is crucial for advancing quantum control and precision measurements.

Purpose of the Study:

To implement a pulsed radial cooling scheme for ytterbium atoms.
To achieve subrecoil temperatures for enhanced quantum control.
To prepare atoms in shallow lattices for improved atomic clock performance.

Main Methods:

Utilized the ultranarrow 1S0–3P0 clock transition in ytterbium.
Implemented a pulsed radial cooling scheme.
Combined with one-dimensional lattice sideband cooling.

Main Results:

Achieved subrecoil temperatures down to tens of nanokelvins.
Prepared atoms in shallow lattices at an energy of 6 lattice recoils.
Demonstrated that tunneling shifts do not compromise clock accuracy at the 10^-19 level.

Conclusions:

The pulsed radial cooling scheme offers a significant advancement in laser cooling for atomic systems.
Subrecoil cooling in shallow lattices dramatically reduces limits on lattice clock accuracy and instability.
This technique paves the way for substantial improvements in atomic clock performance and quantum technologies.