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Quantum mechanics provides a statistical description about nature, and thuswould be incomplete if its statistical predictions could not be accounted forby some realistic models with hidden variables. There are, however, twopowerful theorems against the hidden-variable theories showing that certainquantum features cannot be reproduced based on two rationale premises oflocality, Bell's theorem, and noncontextuality, due to Bell, Kochen and Specker(BKS). Noncontextuality is independent of nonlocality, and the contextualitymanifests itself even in a single object. Here we report an experimentalverification of quantum contextuality by a single spin-1 electron system atroom temperature. Such a three-level system is indivisible and then we closethe compatibility loophole which exists in the experiments performed onbipartite systems. Our results confirm the quantum contextuality to be theintrinsic property of single particles.

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