Fig. 1 Energy levels and laser couplings of the inelastic optical WM-enhanced NMOR effect. Energy levels and laser couplings of the inelastic optical WM-enhanced NMOR effect. (A) Simplified single-beam Λ scheme in the presence of a magnetic field and a linearly polarized probe field. The lower three states are the magnetic sublevels of a generic F = 1 manifold (from left to right: MF = −1, 0, +1) of an alkali atom. (B) Simplified optical WM scheme with linearly polarized probe and wave-mixing fields. For mathematical simplicity, only excited states |2〉 and |4〉 are considered. Feng Zhou et al. Sci Adv 2017;3:e1700422 Copyright © 2017 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution NonCommercial License 4.0 (CC BY-NC).