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Trapping of Micro Particles in Nanoplasmonic Optical Lattice
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Faraday-Shielded dc Stark-Shift-Free Optical Lattice Clock.

K Beloy1, X Zhang1, W F McGrew1,2

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

Physical Review Letters
|May 19, 2018
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Summary
This summary is machine-generated.

We show that a Faraday shield effectively eliminates DC Stark shifts in ytterbium optical lattice clocks. Experimental validation confirms this shielding

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Area of Science:

  • Atomic physics
  • Quantum optics
  • Metrology

Background:

  • Optical lattice clocks are crucial for precise timekeeping.
  • DC Stark shifts caused by stray electric fields can limit clock accuracy.
  • Faraday shields are used to mitigate these electric fields.

Purpose of the Study:

  • To demonstrate the absence of a DC Stark shift in an ytterbium optical lattice clock.
  • To experimentally validate the effectiveness of an in-vacuum Faraday shield.
  • To identify and address potential errors in Stark shift cancellation strategies.

Main Methods:

  • Implementing an in-vacuum Faraday shield to suppress stray electric fields.
  • Applying high voltage to electrodes to diagnose shielding effectiveness.
  • Measuring the DC Stark shift to a precision of 10^{-20} relative to the clock frequency.

Main Results:

  • The DC Stark shift was found to be absent within the measurement precision.
  • The Faraday shield effectively suppressed stray electric fields.
  • A potential error source due to field gradients and atomic extent was identified.

Conclusions:

  • Faraday shielding is a practical and effective solution for eliminating DC Stark shifts in optical lattice clocks.
  • Experimental validation is essential for confirming shielding performance.
  • Consideration of field gradients is important for accurate Stark shift cancellation.