Increasing measurement sensitivity for the electron's electric dipole moment using trapped molecular ions

ORAL

Abstract

Based on our latest measurements of the electron's electric dipole moment (eEDM) using trapped HfF$^+$ ions, after 100 hours of data collection, the statistical error still dominates in our overall uncertainty budget \footnote{Daniel N Gresh's presentation}. Overcoming the bottleneck of limited statistical sensitivity can increase the precision of the eEDM measurement directly. Here, we present the progress of three ongoing experiments: (1) applying STImulated Raman Adiabatic Passage (STIRAP) with rotating linear polarization for increased coherent population transfer from the ground $X^1\Sigma^+$ state to the eEDM-sensitive $^3\Delta_1$ state; (2) implementing a new ion-counting detector toward shot-noise limited sensitivity with significant suppression technical noise; (3) exploring the possibility of using the ground $^3\Delta_1$ state of ThF$^+$ ions to realize a larger effective electric field and a longer coherence time. These experiments provide a route towards an order of magnitude increase in statistical sensitivity in the second generation of measurements.

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Authors

  • Yan Zhou

    • JILA, NIST and University of Colorado, and Department of Physics, University of Colorado, Boulder CO 80309-0440, USA

  • Daniel Gresh

    • JILA, NIST and University of Colorado, and Department of Physics, University of Colorado, Boulder CO 80309-0440, USA

  • William Cairncross

    • JILA, NIST and University of Colorado, and Department of Physics, University of Colorado, Boulder CO 80309-0440, USA

  • Matt Grau

    • JILA, NIST and University of Colorado, and Department of Physics, University of Colorado, Boulder CO 80309-0440, USA

  • Kia Boon Ng

    • JILA, NIST and University of Colorado, and Department of Physics, University of Colorado, Boulder CO 80309-0440, USA

  • Yiqi Ni

    • JILA, NIST and University of Colorado, and Department of Physics, University of Colorado, Boulder CO 80309-0440, USA

  • Eric Cornell

    • JILA, NIST and CU, and Phys. Dept., University of Colorado, Boulder
    • JILA, NIST and Department of Physics, University of Colorado, Boulder, Colorado
    • JILA, NIST and Department of Physics University of Colorado, Boulder CO
    • JILA, NIST and University of Colorado, Boulder
    • JILA, NIST and University of Colorado, and Department of Physics, University of Colorado, Boulder CO 80309-0440, USA

  • Jun Ye

    • JILA/Univ of Colorado - Boulder
    • JILA, NIST and University of Colorado
    • JILA, NIST and University of Colorado, and Department of Physics, University of Colorado, Boulder CO 80309-0440, USA
    • JILA, University of Colorado, Boulder
    • JILA/Univ of Colorado