Description
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 |
|---|---|
| How will you attend ICAP-27? | I am planning on in-person attendance |
