High-fidelity multi-photon transitions via strongly dressed intermediate states

Achieving high-fidelity transition between very weakly coupled atomic levels is important in a number of one-qubit and two-qubit gate schemes. Under practical constraints from thermal errors and limited laser power and coherence, multi-photon transitions can shorten gate times and mitigate several noise sources. In this talk, we present a strategy to simultaneously suppress scattering and polarization-impurity errors in multi-photon transitions by engineering the intermediate states using strong dressing lasers. By exploiting hyperfine interference between coherent and incoherent transition pathways, we investigate the optimal fidelity limits of these multi-photon transitions.