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Clock-Line-Mediated Sisyphus Cooling.

Chun-Chia Chen1,2, Jacob L Siegel1,2, Benjamin D Hunt1,2

  • 1<a href="https://ror.org/05xpvk416">National Institute of Standards and Technology</a>, 325 Broadway, Boulder, Colorado 80305, USA.

Physical Review Letters
|August 19, 2024
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Summary
This summary is machine-generated.

We demonstrate subrecoil Sisyphus cooling in ytterbium atoms using a novel optical method. This technique significantly enhances atom loading efficiency and reduces temperatures in optical lattice clocks, improving precision measurements.

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Area of Science:

  • Atomic Physics
  • Quantum Metrology

Background:

  • Alkaline-earth-like atoms, such as ytterbium, possess long-lived clock states crucial for high-precision measurements.
  • Subrecoil cooling techniques are essential for reaching ultra-low temperatures required for advanced atomic clocks.

Purpose of the Study:

  • To demonstrate subrecoil Sisyphus cooling utilizing the ^{3}P_{0} clock state in ytterbium.
  • To investigate the impact of this cooling method on atom loading efficiency and temperature in optical lattices.
  • To assess the benefits for optical lattice clocks.

Main Methods:

  • Utilizing a 1388-nm optical standing wave near resonance with the ^{3}P_{0}→^{3}D_{1} transition in ytterbium.
  • Implementing Sisyphus cooling by exploiting the light shift of the ^{3}P_{0} state correlated with excitation and decay.
  • Comparing Sisyphus cooling with standard Doppler cooling for loading into a 759-nm magic-wavelength 1D optical lattice.

Main Results:

  • Achieved subrecoil Sisyphus cooling below 200 nK in the transverse dimensions of a 1D optical lattice.
  • Observed enhanced atom loading efficiency into the optical lattice compared to Doppler cooling.
  • Demonstrated the potential for reduced light shifts and quantum projection noise in optical lattice clocks.

Conclusions:

  • Subrecoil Sisyphus cooling in ytterbium's ^{3}P_{0} state is a viable technique for enhancing quantum metrology.
  • This cooling method offers significant advantages for optical lattice clocks, enabling shallower lattices and improved precision.
  • The technique is versatile, applicable in pulsed or continuous modes for various quantum applications.