Abstract
We report on the isotope shift between 88Sr and 87Sr on the 1S0–3P0 clock transitions. The interleaved operation of an optical lattice clock with two isotopes allows the canceling out of common perturbations, such as the quadratic Zeeman shift, the clock-light shift, and the blackbody radiation shift. The isotope shift is determined to be 62 188 134.004(10) Hz, where the major uncertainty is introduced by the collisional shift that is distinct for each isotope. Our result allows us to determine the frequency of 88Sr–87Sr optical lattice clocks with a fractional uncertainty of 2 × 10−17. The scheme is generally applicable for measuring the isotope shift with significantly reduced uncertainty.
Highlights
Optical clocks1-7) outperform state-of-the-art Cs clocks by two orders of magnitude and are pressing the redefinition8) of the second
The absolute frequency of the clock transition in this isotope has only been determined with an uncertainty of 5×10−15 (Ref.15), mainly limited by the quadratic Zeeman shift, clock-light shift, and lattice-light shift
In this Letter, we demonstrate the rejection of such perturbations by the interleaved interrogation of two isotopes and report on the most precise isotope shift Δν0 = ν(88Sr) − ν(87Sr) that allows the determination of the 88Sr clock transition frequency with a fractional uncertainty of 2×10−17 with respect to 87Sr clocks
Summary
Optical clocks1-7) outperform state-of-the-art Cs clocks by two orders of magnitude and are pressing the redefinition8) of the second. The absolute frequency of the clock transition in this isotope has only been determined with an uncertainty of 5×10−15 (Ref.15), mainly limited by the quadratic Zeeman shift, clock-light shift, and lattice-light shift.
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