Jul 17 – 22, 2022
Royal Conservatory of Music, Toronto
America/Toronto timezone

Tests of King's Linearity in Ca+

Jul 19, 2022, 5:00 PM
1h 30m
Hart House (Hart House)

Hart House

Hart House

7 Hart House Cir, Toronto, ON M5S 3H3
Poster presentation Precision measurement and tests of fundamental physics Poster session


We report progress towards a precise measurement of the isotope shifts in the $4^2$S$_{1/2} \rightarrow 3^2$D$_{3/2}$ 732 nm electric quadrupole transition in Ca$^+$. We perform correlation spectroscopy [1,2] on two co-trapped calcium isotopes. Simultaneous excitation of both ions using frequency sidebands derived from a single laser enables cancellation of common-mode laser phase noise and reduction of systematic uncertainties from laser frequency drift or magnetic field instabilities. Such measurements have the potential to exceed Hz-level precision. When combined with our prior exploration [3] of the ${4^2\textrm{S}_{1/2} \rightarrow 3^2\textrm{D}_{5/2}}$ transition isotope shifts in a King Plot, these measurements can enable exacting tests of King's linearity, offering a path toward probing new physics beyond the Standard Model and providing benchmarks for ever-improving theory of atomic and nuclear structure.

[1] M. Chwwalla et al, Appl. Phys. B $\mathbf{89}$, 483-488 (2007).
[2] T. Manovitz et al, Phys. Rev. Lett $\mathbf{123}$, 203001 (2019).
[3] F. W. Knollmann et al, Phys. Rev. A $\mathbf{100}$ 022514 (2019).

Presenter name Timothy Chang
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Primary authors

Timothy Chang (Williams College) Renee DePencier Pinero (Williams College) Bless Bah Awazi (Williams College) Sonya Dutton (Williams College) Charlie Doret (Williams College)

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