Correlated Photon Pair Production by Spontaneous Parametric Down Conversion in Quasi-Phase-Matched AlGaAs superlattice Waveguides using a Continuous Wave Pump

TL;DR

This paper demonstrates highly efficient correlated photon pair generation in AlGaAs superlattice waveguides using continuous wave pumping, achieving a CAR over 100, significantly surpassing previous pulsed pump schemes.

Contribution

It introduces a novel quasi-phase-matched AlGaAs waveguide design for SPDC with continuous wave pumping, leading to a substantial improvement in photon pair correlation quality.

Findings

CAR > 100 achieved with CW pump

Two orders of magnitude improvement over previous schemes

Effective quasi-phase-matching in superlattice waveguides

Abstract

We report on the demonstration of correlated photon pair generation in quasi-phase-matched superlattice AlGaAs waveguides with a high coincidence-to-accidental ratio (CAR); with a continuous (CW) pump, the observed CAR (>100) is more than two order of magnitudes improvement over previously reported spontaneous down conversion (SPDC) schemes in AlGaAs waveguides with a pulsed pump.