We report the experimental violation of Leggett-type inequalities for a hybrid entangled state of spin and orbital angular momentum of a single photon. These inequalities give a physical criterion to verify the possible validity of a class of hidden-variable theories, originally named “crypto nonlocal,” that are not excluded by the violation of Bell-type inequalities. In our case, the tested theories assume the existence of hidden variables associated with independent degrees of freedom of the same particle, while admitting the possibility of an influence between the two measurements, i.e., the so-called contextuality of observables. We observe a violation of the Leggett inequalities for a range of experimental inputs, with a maximum violation of seven standard deviations, thus ruling out this class of hidden-variable models with a high level of confidence.

Violation of Leggett-type inequalities in the spin-orbit degrees of freedom of a single photon / Cardano, Filippo; Ebrahim, Karimi; Marrucci, Lorenzo; DE LISIO, Corrado; Santamato, Enrico. - In: PHYSICAL REVIEW A. - ISSN 1050-2947. - 88:(2013), pp. 032101-1-032101-5. [10.1103/PhysRevA.88.032101]

Violation of Leggett-type inequalities in the spin-orbit degrees of freedom of a single photon

CARDANO, FILIPPO;MARRUCCI, LORENZO;DE LISIO, CORRADO;SANTAMATO, ENRICO
2013

Abstract

We report the experimental violation of Leggett-type inequalities for a hybrid entangled state of spin and orbital angular momentum of a single photon. These inequalities give a physical criterion to verify the possible validity of a class of hidden-variable theories, originally named “crypto nonlocal,” that are not excluded by the violation of Bell-type inequalities. In our case, the tested theories assume the existence of hidden variables associated with independent degrees of freedom of the same particle, while admitting the possibility of an influence between the two measurements, i.e., the so-called contextuality of observables. We observe a violation of the Leggett inequalities for a range of experimental inputs, with a maximum violation of seven standard deviations, thus ruling out this class of hidden-variable models with a high level of confidence.
2013
Violation of Leggett-type inequalities in the spin-orbit degrees of freedom of a single photon / Cardano, Filippo; Ebrahim, Karimi; Marrucci, Lorenzo; DE LISIO, Corrado; Santamato, Enrico. - In: PHYSICAL REVIEW A. - ISSN 1050-2947. - 88:(2013), pp. 032101-1-032101-5. [10.1103/PhysRevA.88.032101]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11588/560763
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