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Trapping of Micro Particles in Nanoplasmonic Optical Lattice
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Operational Magic Intensity for Sr Optical Lattice Clocks.

Ichiro Ushijima1,2, Masao Takamoto1,3, Hidetoshi Katori1,2,3

  • 1Quantum Metrology Laboratory, RIKEN, Wako, Saitama 351-0198, Japan.

Physical Review Letters
|January 13, 2019
PubMed
Summary
This summary is machine-generated.

We studied light shifts in strontium optical lattice clocks, finding a specific lattice depth that cancels these shifts to the 10^-19 level. This precise control enables stable clock operation over a range of intensities.

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Area of Science:

  • Atomic Physics
  • Quantum Metrology
  • Optical Clocks

Background:

  • Optical lattice clocks are crucial for precise timekeeping and fundamental physics.
  • Lattice-induced light shifts, arising from atomic polarizabilities, can limit clock accuracy.
  • Understanding these shifts requires detailed investigation of electric-quadrupole (E2) and magnetic-dipole (M1) interactions.

Purpose of the Study:

  • To experimentally investigate lattice-induced light shifts in strontium (Sr) optical lattice clocks.
  • To determine the contributions of E2 and M1 polarizabilities and hyperpolarizability to light shifts.
  • To identify an optimal operational lattice depth for minimizing light shifts.

Main Methods:

  • Utilized a one-dimensional optical lattice for precise control of Sr atom motion in axial and radial directions.
  • Measured E2 and M1 polarizabilities and hyperpolarizability by analyzing light shifts.
  • Determined the operational lattice depth by observing the cancellation of light shifts.

Main Results:

  • Observed the E2-M1 polarizability difference through controlled atomic motion.
  • Determined an operational lattice depth of 72(2) recoil energies (E_R).
  • Achieved cancellation of total light shifts to the 10^-19 level over a ~30% lattice intensity variation.

Conclusions:

  • The identified operational lattice depth provides a robust condition for Sr optical lattice clocks.
  • This depth allows for significant cancellation of light shifts, enhancing clock stability and accuracy.
  • The findings align with experimentally feasible operating conditions, facilitating practical clock implementation.