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Y. Hasegawa, R. Loidl, G. Badurek, K. Durstberger-Rennhofer, St. Sponar, H. Rauch:
"Engineering of triply entangled states in a single-neutron system";
Physical Review A, 81 (2010), S. 032121-1-6.

Entanglement between degrees of freedom, namely between the spin, path, and (total) energy degrees of
freedom, in a single-neutron system is exploited.We implemented a triply entangled Greenberger-Horne-Zeilinger
(GHZ)-like state and coherently manipulated relative phases of two-level quantum subsystems. An equality
derived by Mermin was applied to analyze the generated GHZ-like state: We determined the four expectation
values and finally obtainedM = 2.558 ± 0.004 2. This demonstrates a violation of Mermin-like inequality for
triply entangled GHZ-like state in a single-particle system, which, in turn, clearly contradicts the noncontextual
assumption and confirms quantum contextuality.

http://dx.doi.org/10.1103/PhysRevA.81.032121

http://publik.tuwien.ac.at/files/PubDat_192216.pdf