Singular enhancement of emission of entangled photons for surface plasmon polaritons

TL;DR

This paper explores how superluminal laser-induced nonlinear polarization at metal-dielectric interfaces can be tuned to achieve singular enhancement of entangled photon pair emission, with potential applications in quantum optics.

Contribution

It introduces a method to enhance entangled photon emission via Doppler tuning at metal-dielectric interfaces, revealing conditions for singular emission enhancement.

Findings

Singular enhancement occurs at specific excitation angles.

Photon pairs are polarization entangled.

Emission yield can be estimated under these conditions.

Abstract

Emission of photon pairs by metal-dielectric interface in case of a superluminally propagating laser-induced nonlinear polarization is considered. Using oblique incidence of the laser wave it is possible to tune frequencies of generated photons due to the Doppler effect. For every frequency smaller than frequency of induced polarization there exist an excitation angle when singular enhancement of the emission takes place. Emitted photon pairs are in the polarization entangled state. The yield of emission is estimated.