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Deutsche Physikalische Gessellschaft IOP Institute of Physics

Experimental violation of Svetlichny's inequality

J Lavoie, R Kaltenbaek and K J Resch1

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It is well known that quantum mechanics is incompatible with local realistic theories. Svetlichny showed, through the development of a Bell-like inequality, that quantum mechanics is also incompatible with a restricted class of nonlocal realistic theories for three particles where any two-body nonlocal correlations are allowed (Svetlichny 1987 Phys. Rev. D 35 3066). In the present work, we experimentally generate three-photon GHZ states to test Svetlichny's inequality. Our states are fully characterized by quantum state tomography using an overcomplete set of measurements and have a fidelity of (84±1)% with the target state. We measure a convincing, 3.6σ, violation of Svetlichny's inequality and rule out this class of restricted nonlocal realistic models.


PACS

03.65.Ud Entanglement and quantum nonlocality (e.g. EPR paradox, Bell's inequalities, GHZ states, etc.)

42.50.Hz Strong-field excitation of optical transitions in quantum systems; multiphoton processes; dynamic Stark shift

03.65.Wj State reconstruction, quantum tomography

Subjects

Optics, quantum optics and lasers

Quantum information and quantum mechanics

Dates

Issue 7 (July 2009)

Received 30 April 2009

Published 29 July 2009



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