High visibility two photon interference of frequency time entangled photons generated in a quasi phase matched AlGaAs waveguide

TL;DR

This paper demonstrates high-visibility two-photon interference using frequency-time entangled photon pairs generated in a quasi phase-matched AlGaAs waveguide, showing strong violation of Bell inequality.

Contribution

It presents the first experimental realization of high-visibility interference with frequency-time entangled photons in AlGaAs waveguides, achieving record visibility and Bell violation.

Findings

Visibility of 96.0% without background subtraction

Violation of Bell inequality by 52 standard deviations

Successful generation of frequency-time entangled photon pairs

Abstract

We demonstrate experimentally the frequency time entanglement of photon pairs produced in a CW pumped quasi phased matched AlGaAs superlattice waveguide. A visibility of 96.0+-0.7% without background subtraction has been achieved, which corresponds the violation of Bell inequality by 52 standard deviations.