Kochen-Specker theorem studied with neutron interferometer

Details Kochen-Specker theorem studied with neutron interferometer Kochen-Specker theorem studied with neutron interferometer

2010-04-16

arxiv.org/abs/1004.2836v1

Physics

Quantum Physics

5 pages, 3 figures

Scientific paper

10.1016/j.nima.2010.06.234

The Kochen-Specker theorem theoretically shows evidence of the incompatibility of noncontextual hidden variable theories with quantum mechanics. Quantum contextuality is a more general concept than quantum non-locality which is quite well tested in experiments by using Bell inequalities. Within neutron interferometry we performed an experimental test of the Kochen-Specker theorem with an inequality, which identifies quantum contextuality, by using spin-path entanglement in a single neutron system. Here entanglement is achieved not between different particles, but between degrees of freedom, i.e., between spin and path degree of freedom. Appropriate combinations of the spin analysis and the position of the phase shifter allow an experimental verification of the violation of an inequality of the Kochen-Specker theorem. The observed value of (2.291 +/- 0.008), which is above the threshold of 1, clearly shows that quantum mechanical predictions cannot be reproduced by noncontextual hidden variable theories.

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