Tripartite correlations over two octaves from cascaded harmonic generation

TL;DR

This paper investigates quantum tripartite correlations generated by a cascaded nonlinear optical system producing multiple harmonic outputs, demonstrating entanglement and EPR steering under different parameter regimes.

Contribution

It provides a quantum analysis of tripartite correlations in a cascaded harmonic generation system, highlighting conditions for inseparability, entanglement, and EPR steering.

Findings

System produces tripartite inseparability and entanglement

Detection of correlations depends on the specific correlations considered

Different parameter regimes yield different quantum correlation properties

Abstract

We analyse the output quantum tripartite correlations from an intracavity nonlinear optical system which uses cascaded nonlinearities to produce both second and fourth harmonic outputs from an input field at the fundamental frequency. Using fully quantum equations of motion, we investigate two parameter regimes and show that the system produces tripartite inseparability, entanglement and EPR steering, with the detection of these depending on the correlations being considered.