A versatile source of polarization-entangled photons

TL;DR

This paper presents a versatile method for generating a wide range of polarization-entangled photon states, including GHZ and W states, using only linear optics and uncorrelated photons from arbitrary sources.

Contribution

It introduces a novel approach to produce various symmetric and non-symmetric entangled states within a single experimental setup.

Findings

Able to generate all symmetric states like GHZ and W

Creates all symmetric and non-symmetric angular momentum eigenstates

Uses only linear optical tools and uncorrelated photons

Abstract

We propose a method for the generation of a large variety of entangled states, encoded in the polarization degrees of freedom of N photons, within the same experimental setup. Starting with uncorrelated photons, emitted from N arbitrary single photon sources, and using linear optical tools only, we demonstrate the creation of all symmetric states, e.g., GHZ- and W-states, as well as all symmetric and non-symmetric total angular momentum eigenstates of the N qubit compound.