Fully Quantum Perturbative Description of Correlated Stokes–Anti‐Stokes Scattering

The process in which Raman scattering produces correlated Stokes and anti‐Stokes radiation is known as Stokes–anti‐Stokes (SaS) scattering. It has been shown recently that this process can generate entangled photon pairs, making it a promising tool for quantum optical technologies, but a proper quantum theoretical description was lacking. In this article, a fully quantum derivation of the electric polarization in a medium with vibrational Raman response, with quantized electromagnetic fields, is developed. Using quantum perturbation theory for Heisenberg operators, the solution for the material electric polarization is found and it is shown that a four‐wave mixing‐like correlated SaS scattering appears in the first order of perturbation and completely characterizes the nonresonant SaS photon pair production. It is also discussed how to construct the third‐order nonlinear optical susceptibility for the SaS scattering from the quantum formalism and show that it coincides with the one derived for classical fields in stimulated Raman.