Correlated photon-pair generation in reverse-proton-exchange PPLN waveguides with integrated mode demultiplexer at 10 GHz clock

TL;DR

This paper demonstrates high-quality correlated photon-pair generation at 10 GHz in lithium niobate waveguides with integrated mode demultiplexer, achieving a high coincidence to accidental count ratio suitable for quantum information applications.

Contribution

It introduces a novel integrated waveguide source for correlated photon pairs at 10 GHz with high CAR, advancing quantum photonics technology.

Findings

Achieved 10-ps correlated photon pairs at 1.5 μm wavelength.

Observed a CAR as high as 4000 using superconducting detectors.

Demonstrated potential for quantum information and entanglement experiments.

Abstract

We report 10-ps correlated photon pair generation in periodically-poled reverse-proton-exchange lithium niobate waveguides with integrated mode demultiplexer at a wavelength of 1.5-um and a clock of 10 GHz. Using superconducting single photon detectors, we observed a coincidence to accidental count ratio (CAR) as high as 4000. The developed photon-pair source may find broad application in quantum information systems as well as quantum entanglement experiments.