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Quantum mechanics provides a statistical description about nature, and thuswould be incomplete if its statistical predictions could not be accounted forsome realistic models with hidden variables. There are, however, two powerfultheorems against the hidden-variable theories showing that certain quantumfeatures cannot be reproduced based on two rationale premises of classicality,the Bell theorem, and noncontextuality, due to Bell, Kochen and Specker (BKS) .Tests of the Bell inequality and the BKS theorem are both of fundamentalinterests and of great significance . The Bell theorem has already beenexperimentally verified extensively on many different systems , while thequantum contextuality, which is independent of nonlocality and manifests itselfeven in a single object, is experimentally more demanding. Moreover, thecontextuality has been shown to play a critical role to supply the `magic' forquantum computation, making more extensive experimental verifications inpotential systems for quantum computing even more stringent. Here we report anexperimental verification of quantum contextuality on an individual atomicnuclear spin-1 system in solids under ambient condition. Such a three-levelsystem is indivisible and thus the compatibility loophole, which exists in theexperiments performed on bipartite systems, is closed. Our experimental resultsconfirm that the quantum contextuality cannot be explained by nonlocalentanglement, revealing the fundamental quantumness other thanlocality/nonlocality within the intrinsic spin freedom of a concrete naturalatomic solid-state system at room temperature.

Experimental test of non-classicality of quantum mechanics using an individual atomic solid-state quantum system