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^{27}Al^{+} Quantum-Logic Clock with a Systematic Uncertainty below 10^{-18}.

S M Brewer1,2, J-S Chen1,2, A M Hankin1,2

  • 1Time and Frequency Division, National Institute of Standards and Technology, Boulder, Colorado 80305, USA.

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|August 7, 2019
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Summary
This summary is machine-generated.

This study presents a new aluminum ion (Al+) optical atomic clock achieving unprecedented accuracy. This advanced quantum logic clock offers improved stability and reduced systematic uncertainties for precise timekeeping.

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Area of Science:

  • Atomic Physics
  • Quantum Optics
  • Metrology

Background:

  • Optical atomic clocks are crucial for fundamental physics tests and advanced technologies.
  • Aluminum ion (Al+) clocks offer potential for high accuracy due to their electronic structure.
  • Previous Al+ clocks faced limitations in stability and systematic uncertainty.

Purpose of the Study:

  • To develop an improved optical atomic clock using quantum-logic spectroscopy of the ^{1}S_{0}↔^{3}P_{0} transition in ^{27}Al+.
  • To reduce systematic uncertainties and enhance frequency stability.
  • To enable clock operation closer to the ground state with reduced environmental influences.

Main Methods:

  • Utilized quantum-logic spectroscopy on a ^{27}Al+ ion.
  • Employed sympathetic cooling and state readout using a simultaneously trapped ^{25}Mg+ ion.
  • Implemented a new trap design to minimize secular motion heating and excess micromotion.

Main Results:

  • Achieved a systematic uncertainty of 9.4×10^{-19}.
  • Demonstrated a frequency stability of 1.2×10^{-15}/sqrt[τ].
  • Reduced time-dilation shift uncertainty through improved ion motion control and lower trap drive frequency.

Conclusions:

  • The developed ^{27}Al+ optical atomic clock represents a significant advancement in precision timekeeping.
  • Reduced systematic uncertainties from micromotion, blackbody radiation, and Zeeman effects enhance clock performance.
  • The new clock design paves the way for future ultra-precise frequency standards.