Experimentally Faking the Violation of Bell's Inequalities

Phys Rev Lett. 2011 Oct 21;107(17):170404. doi: 10.1103/PhysRevLett.107.170404. Epub 2011 Oct 20.


Entanglement witnesses such as Bell inequalities are frequently used to prove the nonclassicality of a light source and its suitability for further tasks. By demonstrating Bell inequality violations using classical light in common experimental arrangements, we highlight why strict locality and efficiency conditions are not optional, particularly in security-related scenarios.