Proposal for the generation of photon pairs with nonzero orbital angular momentum in a ring fiber

TL;DR

This paper proposes a method to generate correlated photon pairs with specific orbital angular momentum states using a non-linear silica ring fiber and spontaneous parametric down-conversion, achieving a quantum efficiency of 6×10⁻¹¹.

Contribution

It introduces a novel approach for generating photon pairs with orbital angular momentum in a ring fiber using thermally induced χ(2) nonlinearity and quasi-phase-matching.

Findings

Photon pairs generated with desired OAM states.

Quantum conversion efficiency of 6×10⁻¹¹ in a 1-m fiber.

Use of thermally induced χ(2) nonlinearity in ring-shaped core.

Abstract

We present a method for the generation of correlated photon pairs in desired orbital-angular-momentum states using a non-linear silica ring fiber and spontaneous parametric down-conversion. Photon-pair emission under quasi-phase-matching conditions with quantum conversion efficiency $ 6\times 10^{-11} $ is found in a 1-m long fiber with a thermally induced $\chi^{(2)}$ nonlinearity in a ring-shaped core.