Experimental generation of complex noisy photonic entanglement

TL;DR

This paper demonstrates an experimental method to generate complex noisy photonic entanglement using spontaneous parametric down-conversion, illustrating fundamental quantum information theory concepts like bound entanglement and privacy.

Contribution

It introduces a novel experimental scheme for creating mixed entangled states with correlated noise, advancing the understanding of entanglement properties in noisy quantum systems.

Findings

Successfully generated mixed entangled states with correlated polarization noise

Illustrated fundamental quantum information theory concepts such as bound entanglement

Provided experimental evidence for the properties of noisy entangled states

Abstract

We present an experimental scheme based on spontaneous parametric down-conversion to produce multiple photon pairs in maximally entangled polarization states using an arrangement of two type-I nonlinear crystals. By introducing correlated polarization noise in the paths of the generated photons we prepare mixed entangled states whose properties illustrate fundamental results obtained recently in quantum information theory, in particular those concerning bound entanglement and privacy.