Entanglement of Gaussian states using beam splitter

TL;DR

This paper investigates how to generate and analyze entanglement between two Gaussian states using a beam splitter, identifying conditions and noise limits for successful entanglement creation.

Contribution

It provides an analytical framework for generating Gaussian entangled states from squeezed and thermal inputs, including noise thresholds and links to nonclassicality.

Findings

Identifies experimental conditions for entanglement generation.

Derives the critical thermal noise level that destroys entanglement.

Links resistance to noise with single-mode nonclassicality.

Abstract

We study an experimental scheme to generate Gaussian two-mode entangled states via beam splitter. Specifically, we consider a nonclassical Gaussian state (squeezed state) and a thermal state as two input modes, and evaluate the degree of entanglement at the output. Experimental conditions to generate entangled outputs are completely identified and the critical thermal noise to destroy entanglement is analytically obtained. By doing so, we discuss the possibility to link the resistance to noise in entanglement generation with the degree of single-mode nonclassicality.