Thursday, October 4, 2012

1210.0961 (Xi Kong et al.)

An experimental test of the non-classicality of quantum mechanics using
an unmovable and indivisible system
   [PDF]

Xi Kong, Mingjun Shi, Fazhan Shi, Pengfei Wang, Pu Huang, Qi Zhang, Chenyong Ju, Changkui Duan, Sixia Yu, Jiangfeng Du
Quantum mechanics provides a statistical description about nature, and thus would be incomplete if its statistical predictions could not be accounted for by some realistic models with hidden variables. There are, however, two powerful theorems against the hidden-variable theories showing that certain quantum features cannot be reproduced based on two rationale premises of locality, Bell's theorem, and noncontextuality, due to Bell, Kochen and Specker (BKS). Noncontextuality is independent of nonlocality, and the contextuality manifests itself even in a single object. Here we report an experimental verification of quantum contextuality by a single spin-1 electron system at room temperature. Such a three-level system is indivisible and then we close the compatibility loophole which exists in the experiments performed on bipartite systems. Our results confirm the quantum contextuality to be the intrinsic property of single particles.
View original: http://arxiv.org/abs/1210.0961

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