Theoretical framework of entangled-photon generation from biexcitons in nano-to-bulk crossover regime with planar geometry

TL;DR

This paper develops a theoretical framework for entangled photon generation via biexciton-resonant scattering in nano-to-bulk crossover regimes, analyzing material effects and cavity enhancements to optimize efficiency and photon quality.

Contribution

It introduces a comprehensive theoretical model applicable to nano-to-bulk regimes, incorporating material surroundings and polarization, and demonstrates potential for high-performance entangled photon sources.

Findings

High statistical accuracy in nano-to-bulk crossover regime

Enhanced generation efficiency with optical cavities

Explicit reflection of quantized exciton-photon modes

Abstract

We have constructed a theoretical framework of the biexciton-resonant hyperparametric scattering for the pursuit of high-power and high-quality generation of entangled photon pairs. Our framework is applicable to nano-to-bulk crossover regime where the center-of-mass motion of excitons and biexcitons is confined. Material surroundings and the polarization correlation of generated photons can be considered. We have analyzed the entangled-photon generation from CuCl film, by which ultraviolet entangled-photon pairs are generated, and from dielectric microcavity embedding a CuCl layer. We have revealed that in the nano-to-bulk crossover regime we generally get a high performance from the viewpoint of statistical accuracy, and the generation efficiency can be enhanced by the optical cavity with maintaining the high performance. The nano-to-bulk crossover regime has a variety of degrees of freedom to tune the entangled-photon generation, and the scattering spectra explicitly reflect quantized exciton-photon coupled modes in the finite structure.