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A novel in-vacuum radiation shield improves atomic clock precision by creating a stable blackbody radiation (BBR) environment. This advancement significantly reduces uncertainty in BBR Stark shift, enhancing atomic frequency standards performance.

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Area of Science:

  • Atomic physics
  • Metrology
  • Quantum optics

Background:

  • Blackbody radiation (BBR) poses a significant challenge to the precision of atomic frequency standards.
  • Precisely characterizing the BBR environment within atomic clock apparatus is difficult.
  • The Stark shift induced by BBR is a primary limitation in atomic clock performance.

Purpose of the Study:

  • To develop and demonstrate an in-vacuum radiation shield for a well-characterized BBR environment.
  • To reduce the uncertainty associated with the BBR Stark shift in atomic clocks.
  • To enable precise measurement of BBR shift temperature dependence.

Main Methods:

  • An in-vacuum radiation shield was designed and implemented for an ytterbium optical lattice clock.
  • The shield was operated at room temperature and elevated temperatures to assess BBR environment.
  • Fractional clock uncertainty contributions from BBR were precisely specified.

Main Results:

  • The shield provided a uniform and well-characterized BBR environment at room temperature.
  • The BBR environment specification yielded a fractional clock uncertainty of 5.5×10⁻¹⁹.
  • Total uncertainty for the BBR Stark shift was reduced to 1×10⁻¹⁸.
  • Operation at elevated temperatures confirmed BBR shift temperature dependence and environmental evaluation consistency.

Conclusions:

  • The developed in-vacuum radiation shield significantly enhances the precision of atomic clocks.
  • This technology offers a pathway to more accurate atomic frequency standards by controlling BBR effects.
  • The shield's ability to measure temperature dependence validates its environmental characterization capabilities.