Creating path entanglement and violating Bell inequalities by independent photon sources

TL;DR

This paper demonstrates a new method to violate Bell inequalities using photons from independent sources, highlighting how path entanglement can be post-selected through detection modes in free space.

Contribution

It introduces a novel approach to generate and observe path entanglement from independent photon sources, enabling Bell inequality violations without prior entanglement.

Findings

Successful violation of position-dependent Bell inequalities

Path entanglement created post-detection

Viability of independent photon sources for quantum tests

Abstract

We demonstrate a novel approach of violating position dependent Bell inequalities by photons emitted via independent photon sources in free space. We trace this violation back to path entanglement created a posteriori by the selection of modes due to the process of detection.