Enhancing the Violation of the Einstein-Podolsky-Rosen Local Realism by Quantum Hyperentanglement

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Marco Barbieri,¹ Francesco De Martini,¹ Paolo Mataloni,¹ Giuseppe Vallone,² and Adán Cabello³
¹Dipartimento di Fisica dell'Università "La Sapienza" and Consorzio Nazionale Interuniversitario per le Scienze Fisiche della Materia, 00185 Roma, Italy
²Dipartimento di Fisica Teorica Università di Torino and Istituto Nazionale di Fisica Nucleare - sezione di Torino - 10125 Torino, Italy
³Departamento de Física Aplicada II, Universidad de Sevilla, 41012 Sevilla, Spain

Received 13 June 2006; published 6 October 2006

Mermin'sobservation [Phys. Rev. Lett. 65, 1838 (1990)] that the magnitudeof the violation of local realism, defined as the ratiobetween the quantum prediction and the classical bound, can growexponentially with the size of the system is demonstrated usingtwo-photon hyperentangled states entangled in polarization and path degrees offreedom, and local measurements of polarization and path simultaneously.

URL:	http://link.aps.org/doi/10.1103/PhysRevLett.97.140407
DOI:	10.1103/PhysRevLett.97.140407
PACS:	03.65.Ud; 03.67.Pp; 42.50.-p 03.65.Ud Entanglement and quantum nonlocality (e.g. EPR paradox, Bell's inequalities, GHZ states, etc.) 03.67.Pp Quantum error correction and other methods for protection against decoherence 42.50.-p Quantum optics YEAR: 2006

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