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

We propose a stroboscopic method to dynamically decouple the effects of two-body atom-atom interactions for ultracold bosonic 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 bosons quenched in an optical lattice, we can measure the three-body interaction strength with a precision proportional to (n) over bar (-5/2) using homodyne quadrature interferometry, and (n) over bar (-7/4) using conventional collapse-and-revival techniques, where (n) over bar is the mean number of atoms per lattice site. Both precision scalings surpass the nonlinear scaling of (n) over bar (-3/2), which was previously proposed and achieved 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.