Correlated photon pair generation in AlGaAs nanowaveguides via spontaneous four-wave mixing

Abstract

We demonstrate a source of correlated photon pairs which will have applications in future integrated quantum photonic circuits. The source utilizes spontaneous four-wave mixing (SFWM) in a dispersion-engineered nanowaveguide made of AlGaAs, which has merits of negligible two-photon absorption and low spontaneous Raman scattering (SpRS). We observe a coincidence-to-accidental (CAR) ratio up to 177, mainly limited by propagation losses. Experimental results agree well with theoretical predictions of the SFWM photon pair generation and the SpRS noise photon generation. We also study the effects from the SpRS, propagation losses, and waveguide lengths on the quality of our source.

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• Nonlinear integrated quantum photonics with AlGaAs
• Measuring higher-order photon correlations of faint quantum light: a short review
• Tunable Four-Wave Mixing in AlGaAs Waveguides of Three Different Geometries
• Nonlinear Photon Pair Generation in a Highly Dispersive Medium
• Adding Photonic Entanglement to Superradiance by Using Multilevel Atoms