Generation of entangled states of light using discrete solitons in waveguide arrays

TL;DR

This paper demonstrates that discrete solitons in coupled nonlinear waveguides can generate entangled light states, enabling scalable quantum entanglement without requiring highly nonlinear materials or being significantly affected by absorption.

Contribution

It introduces a method to generate continuous variables entanglement using quasi-solitons in waveguide arrays, even with high photon numbers and moderate absorption.

Findings

Entanglement can be generated between specific waveguides using discrete solitons.

The process is effective with high photon numbers and does not rely on highly nonlinear materials.

Absorption has limited impact on the entanglement generation.

Abstract

We study the quantum properties of light propagating through an array of coupled nonlinear waveguides and forming a discrete soliton. We demonstrate that it is possible to use certain types of quasi-solitons to form continuous variables entanglement between the certain pair of waveguides. This entanglement generation process occurs even with a very large number of photons in the laser field used, so it does not require a special material with an extremely high nonlinearity coefficient. Also absorption in the waveguide media does not influence it too much.