Dynamically decoupled three-body interactions with applications to interaction-based quantum metrology

TL;DR

This paper introduces a stroboscopic technique to isolate three-body interactions in ultracold atoms, enabling enhanced quantum metrology precision and potential creation of exotic states.

Contribution

The authors develop a dynamic decoupling method to suppress two-body interactions, allowing the study and utilization of pure three-body interactions in ultracold atomic systems.

Findings

Achieved measurement precision scaling as ${ar n}^{-5/2}$ and ${ar n}^{-7/4}$.

Surpassed previous nonlinear scaling limit of ${ar n}^{-3/2}$.

Potential applications in creating exotic three-body states.

Abstract

We propose a stroboscopic method to dynamically decouple the effects of two-body atom-atom interactions for ultracold atoms, and realize a system dominated by elastic three-body interactions. Using this method, we show that it is possible to achieve the optimal scaling behavior predicted for interaction-based quantum metrology with three-body interactions. Specifically, we show that for ultracold atoms quenched in an optical lattice, we can measure the three-body interaction strength with a precision proportional to ${\bar n}^{-5/2}$ using homodyne quadrature interferometry, and ${\bar n}^{-7/4}$ using conventional collapse-and-revival techniques, where ${\bar n}$ is the mean number of atoms per lattice site. Both precision scalings surpass the nonlinear scaling of ${\bar n}^{-3/2}$, the best so far achieved or proposed with a physical system. Our method of achieving a decoupled three-body interacting system may also have applications in the creation of exotic three-body states and phases.