Proposal for an Integrated Raman-free Correlated Photon Source

TL;DR

This paper introduces a dual-pump third-order nonlinear scheme for generating correlated photon pairs with reduced Raman noise, offering improved signal-to-noise ratio over traditional SFWM methods.

Contribution

It presents a novel dual-pump scheme derived from the full multimode Hamiltonian, demonstrating reduced Raman noise and higher pair production probability.

Findings

Achieves 0.028 photon pairs per pulse in fused silica microfiber.

Significant suppression of spontaneous Raman scattering.

Improved signal-to-noise ratio compared to standard SFWM.

Abstract

We propose a dual-pump third-order nonlinear scheme for producing pairs of correlated photons that is less susceptible to Raman noise than typical spontaneous four wave mixing methods (SFWM). Beginning with the full multimode Hamiltonian we derive a general expression for the joint spectral amplitude, from which the probability of producing a pair of photons can be calculated. As an example, we demonstrate that a probability of 0.028 pairs per pulse can be achieved in an appropriately designed fused silica microfiber. As compared with single pump SFWM in standard fiber, we calculate that our process shows significant suppression of the spontaneous Raman scattering and an improvement in the signal to noise ratio.