Emergent broadband polarization entanglement from electronic and phononic Stokes–anti-Stokes indistinguishability
Phys. Rev. A 112, 033702 – Published 3 September, 2025
DOI: https://doi.org/10.1103/c8nj-chfn
Abstract
Recently [T. A. Freitas et al., Phys. Rev. A 108, L051501 (2023)], it was shown that, in a centrosymmetric cubic system, two photons from a broadband intense laser field can be converted into a pair of Stokes and anti-Stokes (SaS) entangled photons. While the previous work was based on symmetry arguments, here we present a fully quantum theory for the SaS scattering that properly explains, quantitatively describes, and provides a means to predict its spectral and polarization properties (for diamond). We also explore the possibilities offered by such a system, designing an entanglement map based on changes in the light-matter system. In particular, we show how the broadband polarization entanglement that emerges from the interference between electronic and phononic degrees of freedom in the SaS scattering depends on parameters such as the Stokes–anti-Stokes Raman shift, scattering geometry, and laser bandwidth, opening the avenue of exploration of such phenomenon in information processing.
