Emergent broadband polarization entanglement from electronic and phononic Stokes-anti-Stokes indistinguishability

TL;DR

This paper develops a quantum theory for broadband polarization entanglement generated via Stokes-anti-Stokes scattering in centrosymmetric systems like diamond, revealing how system parameters influence entanglement properties for potential info processing applications.

Contribution

It provides a comprehensive quantum model for SaS scattering, explaining and predicting spectral and polarization features, and explores entanglement control based on system parameters.

Findings

Quantum theory accurately describes SaS entanglement.

Entanglement depends on Raman shift, geometry, and laser bandwidth.

Potential applications in quantum information processing.

Abstract

Recently [PRA 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 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 Stokes-anti-Stokes Raman shift, scattering geometry and laser bandwidth, opening the avenue of exploration of such phenomenon in information processing.