Quantum mechanics: Hidden context

Blinov, Boris
July 2009
Nature;7/23/2009, Vol. 460 Issue 7254, p464
Academic Journal
The article reports on a study which examines a system of trapped ions and demonstrate that quantum mechanics conflicts with non-contextuality regardless of the quantum state of the system. The researcher have utilized a pair of trapped ions for which almost any spin state could be prepared on demand. They made a sequence of compatible measurements on the spin states to test whether a Bell-like inequality was obeyed or violated. Moreover, the study showed that for all quantum states tested, they found a strong violation of the inequality, a clear demonstration of the contextual nature of quantum mechanics.


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