Random nonlinear layered structures as sources of photon pairs for quantum-information processing

TL;DR

This paper explores how random nonlinear layered structures can generate high-flux, indistinguishable photon pairs with narrow spectral range, useful for quantum information processing, by leveraging optical field localization and emission path superposition.

Contribution

It introduces a novel approach using random layered structures to produce specific two-photon states suitable for quantum information tasks.

Findings

High photon-pair fluxes achieved due to localization effects

Generation of various two-photon states, including coincident frequencies

Efficient superposition of emission paths for state control

Abstract

Random nonlinear layered structures have been found to be a useful source of photon pairs with perfectly indistinguishable un-entangled photons emitted into a very narrow spectral range. Localization of the interacting optical fields typical for random structures gives relatively high photon-pair fluxes. Superposing photon-pair emission quantum paths at different emission angles, several kinds of two-photon states (including states with coincident frequencies) useful in quantum-information processing can easily be generated.