A general approach to model counterpropagating continuous variable entangled states in a lossy CROW

TL;DR

This paper introduces a numerical approach to model counterpropagating continuous-variable entangled states in lossy coupled-resonator optical waveguides, expanding the analysis capabilities beyond previous analytical methods.

Contribution

It develops a numerical method for modeling entangled states in lossy systems, allowing greater flexibility and accuracy than prior analytical approaches.

Findings

Numerical Schmidt decomposition enhances modeling flexibility.

The method surpasses previous analytical approximations.

It enables exploration of a wider parameter space.

Abstract

We present a general approach to model an integrated source of counterpropagating continuous-variable entangled states based on a coupled-resonator optical waveguide that is pumped by a classical pulsed source incident from above the waveguide. This paper is an extension of our previous work~(Ref. \cite{PhysRevA.100.033839}), where we analytically investigated the generation and propagation of continues-variable entangled states in this coupled-cavity system in the presence of intrinsic loss. However, in this work, we employ a numerical method to implement the Schmidt decomposition method rather than pursuing analytical methods. We show that not only this gives us a much higher degree of freedom in choosing the pumping parameters which were not possible to investigate analytically, but also it enables us to go beyond some of the approximations we had made to derive analytical expressions before.