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Suppressing Inhomogeneous Broadening in a Lutetium Multi-ion Optical Clock.

T R Tan1,2, R Kaewuam1, K J Arnold1

  • 1Centre for Quantum Technologies, National University of Singapore, 3 Science Drive 2, 117543 Singapore.

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We precisely controlled broadening in a three-ion clock using lutetium-176 ions. This work achieves high stability for quantum clocks, crucial for advanced timekeeping and metrology.

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Area of Science:

  • Atomic Physics
  • Quantum Metrology
  • Ion Trapping

Background:

  • Controlling systematic effects is crucial for high-precision atomic clocks.
  • Inhomogeneous broadening in multi-ion systems can limit clock performance.

Purpose of the Study:

  • To demonstrate precision measurement and control of inhomogeneous broadening in a multi-ion clock.
  • To characterize and suppress differential systematic shifts between ions.

Main Methods:

  • Utilized microwave spectroscopy on hyperfine states in the ^{3}D_{1} level of ^{176}Lu^{+} ions.
  • Employed magnetic field alignment to suppress electric quadrupole moment effects.
  • Performed correlation spectroscopy on the ^{1}S_{0}↔^{3}D_{1} optical transition.

Main Results:

  • Achieved suppression of differential systematic shifts to the ~10^{-17} level.
  • Demonstrated the feasibility of a 10-second Ramsey interrogation time.
  • Obtained a projection noise limited stability of σ(τ)=8.2×10^{-17}/sqrt[τ].

Conclusions:

  • Precision control of broadening in multi-ion clocks is achievable.
  • The demonstrated stability is competitive for next-generation atomic clocks.
  • This method offers a pathway to improved quantum metrology and timekeeping.