Realization of Trapped Ion Dynamics in the Strong-Field Regime and Non-Markovianity
We experimentally investigate trapped ion dynamics in the strong-driving regime, where the Rabi frequency (Omega) is comparable to the vibrational mode frequency (nu). In the conventional weak-driving regime (Omega << nu), the dynamics is well described by effective Hamiltonians for the carrier and motional sidebands, associated with detunings (delta = n nu (n = 0, +/- 1, ...)). In the strong-driving regime (Omega ~ nu), these interactions can no longer be treated independently. We characterize this physics through the reduced dynamics of the qubit, where non-Markovian behavior emerges as an operational probe of the spin-motion coupling. We observe a structured non-Markovian response, with well-defined maxima that follow the generalized resonance condition (delta^2 + Omega^2 = nu^2), reflecting the strong underlying spin-motion hybridization characteristic of the strong-driving regime.