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Title: State-independent proof of Kochen-Specker theorem with 13 rays
Authors: Yu, S. 
Oh, C.H. 
Issue Date: 18-Jan-2012
Citation: Yu, S., Oh, C.H. (2012-01-18). State-independent proof of Kochen-Specker theorem with 13 rays. Physical Review Letters 108 (3) : -. ScholarBank@NUS Repository.
Abstract: Quantum contextuality, as proved by Kochen and Specker, and also by Bell, should manifest itself in any state in any system with more than two distinguishable states and recently has been experimentally verified. However, for the simplest system capable of exhibiting contextuality, a qutrit, the quantum contextuality is verified only state dependently in experiment because too many (at least 31) observables are involved in all the known state-independent tests. Here we report an experimentally testable inequality involving only 13 observables that is satisfied by all noncontextual realistic models while being violated by all qutrit states. Thus our inequality facilitates a state-independent test of the quantum contextuality for an indivisible quantum system. We also provide a record-breaking state-independent proof of the Kochen-Specker theorem with 13 directions determined by 26 points on the surface of a magic cube. © 2012 American Physical Society.
Source Title: Physical Review Letters
ISSN: 00319007
DOI: 10.1103/PhysRevLett.108.030402
Appears in Collections:Staff Publications

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