Two-photon interference of photon pairs created in photonic crystal fibers

TL;DR

This paper demonstrates a method to generate photon pairs via four-wave mixing in photonic crystal fibers, achieving high-visibility two-photon interference fringes that surpass classical limits, advancing quantum photonics applications.

Contribution

It introduces a controllable wavelength approach to produce broad-spectrum photon pairs with high interference visibility in PCFs, surpassing previous limitations.

Findings

Achieved 83% interference visibility, exceeding the classical limit of 50%.

Controlled wavelength of pump light broadens photon pair spectrum.

Demonstrated two-photon interference using an unbalanced Mach-Zehnder interferometer.

Abstract

We investigate a method to produce photon pairs by four-wave mixing in photonic crystal fibers (PCFs). By controlling the wavelength of the pump light, which determines the phase matching condition for four-wave mixing, we can obtain a broader spectrum of photon pairs than undesired Raman-scattered photons. We observe two-photon interference of photon pairs from a PCF with the help of an unbalanced Mach-Zehnder interferometer. Two-photon interference fringes with 83% visibility, which exceeds the classical limit of 50%, are obtained.