Rabi Spectroscopy and Sensitivity of a Floquet Engineered Optical Lattice Clock

TL;DR

This paper demonstrates Floquet engineering of internal atomic states in an optical lattice clock, enhancing spectroscopic sensitivity and opening new avenues for precision measurement and quantum control.

Contribution

It introduces a method to shape Floquet spin quasi-energies in an optical clock, revealing new control over internal atomic degrees of freedom.

Findings

Floquet modulation does not deplete spectroscopic sensitivity.

Resonance profiles measured via Rabi spectroscopy.

Potential applications in metrology and quantum sensing.

Abstract

We periodically modulate the lattice trapping potential of a $^{87}$Sr optical clock to Floquet engineer the clock transition. In the context of atomic gases in lattices, Floquet engineering has been used to shape the dispersion and topology of Bloch quasi-energy bands. Differently from these previous works manipulating the external (spatial) quasi-energies, we target the internal atomic degrees of freedom. We shape Floquet spin quasi-energies and measure their resonance profiles with Rabi spectroscopy. We provide the spectroscopic sensitivity of each band by measuring the Fisher information and show that this is not depleted by the Floquet dynamical modulation. The demonstration that the internal degrees of freedom can be selectively engineered by manipulating the external degrees of freedom inaugurates a novel device with potential applications in metrology, sensing and quantum simulations.