Abstract
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.
- Received 9 August 2011
DOI:https://doi.org/10.1103/PhysRevLett.107.170404
© 2011 American Physical Society
Synopsis
Eve Fools Alice and Bob
Published 20 October 2011
Experiments with classical light sources show that tests of Bell’s inequalities can be manipulated to yield counterfeit quantum answers.
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