Quantum theory introduces a cut between the observer and the observed system , but does not provide a definition of what is an observer . Based on an informational def- inition of the observer, Grinbaum has recently  predicted an upper bound on bipartite correlations in the Clauser-Horne-Shimony-Holt (CHSH) Bell scenario equal to 2.82537, which is slightly smaller than the Tsirelson bound  of standard quantum theory, but is consistent with all the available experimental results [5–17]. Not being able to exceed Grin- baum’s limit would support that quantum theory is only an effective description of a more fundamental theory and would have a deep impact in physics and quantum information processing. In this thesis, we present a test of the CHSH inequality on photon pairs in maximally entangled states of polarization in which a value 2.8276 ± 0.00082 is observed, violating Grinbaum’s bound by 2.72 standard deviations and providing the smallest distance with respect to Tsirelson’s bound ever reported, namely, 0.0008 ± 0.00082. (Abstract shortened by UMI.)
|School:||National University of Singapore (Singapore)|
|School Location:||Republic of Singapore|
|Source:||DAI-B 77/06(E), Dissertation Abstracts International|
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