State-independent experimental test of quantum contextuality
By G. Kirchmair, F. Zähringer, R. Gerritsma, M. Kleinmann, Otfried Gühne, Adán Cabello, Rainer Blatt, C. F. Roos. Nature, 2009
364 citations recorded by the source corpus.
The question of whether quantum phenomena can be explained by classical models with hidden variables is the subject of a long-lasting debate. In 1964, Bell showed that certain types of classical models cannot explain the quantum mechanical predictions for specific states of distant particles, and some types of hidden variable models have been experimentally ruled out. An intuitive feature of classical models is non-contextuality: the property that any measurement has a value independent of other compatible measurements being carried out at the same time. However, a theorem derived by Kochen, Specker and Bell shows that non-contextuality is in conflict with quantum mechanics. The conflict resides in the structure of the theory and is independent of the properties of special states. It has been debated whether the Kochen–Specker theorem could be experimentally tested at all. First tests of quantum contextuality have been proposed only recently, and undertaken with photons and neutrons. But these tests required the generation of special quantum states and left various loopholes open. Here we perform an experiment with trapped ions that demonstrates a state-independent conflict with non-contextuality. The experiment is not subject to the detection loophole and we show that, despite imperfections and possible measurement disturbances, our results cannot be explained in non-contextual terms.
Subfields: Artificial Intelligence, Atomic and Molecular Physics, and Optics, Statistical and Nonlinear Physics
View Paper: https://www.semanticscholar.org/paper/091d8af0cc63c4a9782af418a802446f7f2c579a
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Citations in the corpus
- Do We Really Understand Quantum Mechanics? (2012, positive): “Experiments have also been performed with neutrons [300], trapped ions [301], and nuclear spins in a solid studied by nuclear magnetic resonance [302], providing other examples of good agreement with the predictions of quantum mechanics.”
- The sheaf-theoretic structure of non-locality and contextuality (2011, neutral): “Bell’s insights into non-locality have been seminal to current developments in quantum information, where entanglement is viewed as a key informatic resource; there has also been considerable recent work on experimental tests for contextuality [3, 4].”