Atom Interferometry with Floquet Atom Optics

TL;DR

This paper demonstrates Floquet engineering in atom optics using strontium, achieving high-efficiency atom manipulation and large momentum transfer in interferometry, with broad implications for quantum control.

Contribution

It introduces a method for Floquet atom optics with high efficiency and applies it to enhance atom interferometry, enabling large momentum transfer and Doppler shift compensation.

Findings

Pulse efficiencies above 99.4% achieved

Large momentum transfer exceeding 400 ħk demonstrated

Effective compensation of differential Doppler shifts

Abstract

Floquet engineering offers a compelling approach for designing the time evolution of periodically driven systems. We implement a periodic atom-light coupling to realize Floquet atom optics on the strontium ${}^1\!S_0\,\text{-}\, {}^3\!P_1$ transition. These atom optics reach pulse efficiencies above $99.4\%$ over a wide range of frequency offsets between light and atomic resonance, even under strong driving where this detuning is on the order of the Rabi frequency. Moreover, we use Floquet atom optics to compensate for differential Doppler shifts in large momentum transfer atom interferometers and achieve state-of-the-art momentum separation in excess of $400~\hbar k$. This technique can be applied to any two-level system at arbitrary coupling strength, with broad application in coherent quantum control.