Experimental violation of a spin-1 Bell inequality using maximally-entangled four-photon states

Details Experimental violation of a spin-1 Bell inequality using maximally-entangled four-photon states Experimental violation of a spin-1 Bell inequality using maximally-entangled four-photon states

2001-05-25

arxiv.org/abs/quant-ph/0105132v2

Phys. Rev. Lett. 88, 030401 (2002)

Physics

Quantum Physics

5 pages, 3 figures, Revtex4. Problem with figures resolved

Scientific paper

10.1103/PhysRevLett.88.030401

We demonstrate the first experimental violation of a spin-1 Bell inequality. The spin-1 inequality is a calculation based on the Clauser, Horne, Shimony and Holt formalism. For entangled spin-1 particles the maximum quantum mechanical prediction is 2.552 as opposed to a maximum of 2, predicted using local hidden variables. We obtained an experimental value of 2.27 $\pm 0.02$ using the four-photon state generated by pulsed, type-II, stimulated parametric down-conversion. This is a violation of the spin-1 Bell inequality by more than 13 standard deviations.

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