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Phys Rev Lett. 2006 Oct 6;97(14):140407. Epub 2006 Oct 6.

Enhancing the violation of the einstein-podolsky-rosen local realism by quantum hyperentanglement.

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Dipartimento di Fisica dell'Università La Sapienza and Consorzio Nazionale Interuniversitario per le Scienze Fisiche della Materia, 00185 Roma, Italy.


Mermin's observation [Phys. Rev. Lett. 65, 1838 (1990)] that the magnitude of the violation of local realism, defined as the ratio between the quantum prediction and the classical bound, can grow exponentially with the size of the system is demonstrated using two-photon hyperentangled states entangled in polarization and path degrees of freedom, and local measurements of polarization and path simultaneously.

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