Resolving the gravitational redshift in a millimetre-scale atomic sample

ORAL  · Invited

Abstract

In this talk I discuss recent progress on the accuracy and precision of state-of-the-art optical atomic clocks. The improved measurement stability of this system enables the resolution of a linear frequency gradient consistent with the gravitational redshift within a single millimetre-scale sample of ultracold strontium. Our result is enabled by improving the fractional frequency measurement uncertainty by more than a factor of 10, now reaching 7.6x10^-21. This heralds a new regime of clock operation necessitating intra-sample corrections for gravitational perturbations. In addition, I discuss the ability to tune the relative strength of the on-site and off-site interactions to achieve a zero density shift at a `magic' lattice depth. This mechanism, together with a large number of atoms, enables the demonstration of the most stable atomic clock while minimizing a key systematic uncertainty related to atomic density. Interactions can also be maximized by driving off-site Wannier-Stark transitions, realizing a ferromagnetic to paramagnetic dynamical phase transition.

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Presenters

  • Colin J Kennedy

    • Quantinuum
    • JILA, NIST and Dept. of Physics, University of Colorado Boulder
    • JILA, NIST, and University of Colorado Boulder
    • University of Colorado, Boulder
    • JILA, NIST and University of Colorado Boulder

Authors

  • Colin J Kennedy

    • Quantinuum
    • JILA, NIST and Dept. of Physics, University of Colorado Boulder
    • JILA, NIST, and University of Colorado Boulder
    • University of Colorado, Boulder
    • JILA, NIST and University of Colorado Boulder

  • Tobias Bothwell

    • University of Colorado, Boulder
    • JILA, NIST and Dept. of Physics, University of Colorado Boulder
    • JILA, NIST, and University of Colorado Boulder
    • JILA, NIST and University of Colorado Boulder

  • Alexander G Aeppli

    • University of Colorado, Boulder

  • Dhruv Kedar

    • JILA, NIST, and University of Colorado, 440 UCB, Boulder, Colorado 80309, USA
    • University of Colorado, Boulder
    • JILA, NIST and Dept. of Physics, University of Colorado Boulder

  • John M Robinson

    • JILA, NIST, and University of Colorado, 440 UCB, Boulder, Colorado 80309, USA
    • JILA, NIST, and University of Colorado Boulder
    • University of Colorado, Boulder

  • Eric Oelker

    • Institute for Gravitational Research, School of Physics and Astronomy, Glasgow G12 8QQ, United Kingdom
    • University of Colorado, Boulder, NIST

  • Alexander Staron

    • JILA, NIST, and University of Colorado, 440 UCB, Boulder, Colorado 80309, USA
    • University of Colorado, Boulder

  • Anjun Chu

    • JILA
    • JILA, NIST and Dept. of Physics, University of Colorado Boulder

  • Peiru He

    • JILA
    • JILA, NIST and Dept. of Physics, University of Colorado Boulder

  • Ana Maria Rey

    • JILA
    • JILA, NIST and Dept. of Physics, University of Colorado Boulder
    • UC Boulder/JILA
    • JILA, NIST and University of Colorado Boulder
    • JILA, Department of Physics, University of Colorado, Boulder

  • Jun Ye

    • University of Colorado, Boulder
    • JILA, NIST, and University of Colorado, 440 UCB, Boulder, Colorado 80309, USA
    • JILA, NIST and Dept. of Physics, University of Colorado Boulder
    • CU Boulder