Dynamics of quantum light in integrated nonlinear waveguide arrays and generation of robust continuous variable entanglement

TL;DR

This paper explores nonlinear waveguide arrays with quadratic nonlinearity for generating robust bipartite and tripartite continuous variable entanglement, addressing losses, material choices, and phase matching issues for integrated quantum light sources.

Contribution

It demonstrates the feasibility of using integrated nonlinear waveguide arrays to generate and manipulate continuous variable entanglement on a single chip, advancing integrated quantum photonics.

Findings

Viability of waveguide arrays for entanglement generation

Impact of realistic losses on entanglement quality

Proposed solutions for phase matching issues

Abstract

We study a class of nonlinear waveguide arrays where the waveguides are endowed with quadratic non- linearity and are coupled through the evanescent overlap of the guided modes. We study both the stimulated and spontaneous process in the array and show the viability of such an array as a platform for generating both bipartite and tripartite continuous variable entanglement on demand. We explicitly address the affect of realistic losses on the entanglement produced, briefly discuss the possible types of nonlinear materials that could be used, and suggest solutions to the possible phase matching issues in the waveguides. The simultaneous generation and manipulation of the light on a single waveguide chip circumvents the usual bandwidth problems associated with the use of external bulky optical elements and makes this avenue promising for further investigation.