Evaluating the Maximal Violation of the Original Bell Inequality by Two-Qudit States Exhibiting Perfect Correlations/Anticorrelations

We introduce the general class of symmetric two-qubit states guaranteeing the perfect correlation or anticorrelation of Alice and Bob outcomes whenever some spin observable is measured at both sites. We prove that, for all states from this class, the maximal violation of the original Bell inequality...

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Bibliographic Details
Published in:Entropy (Basel, Switzerland) Switzerland), 2018-10, Vol.20 (11), p.829
Main Authors: Khrennikov, Andrei Y, Loubenets, Elena R
Format: Article
Language:English
Subjects:
Applied Mathematics
Bell's inequality
Entangled states
Experiments
measure of classicality
original Bell inequality
perfect correlation/anticorrelation
Probability
quantum bound
Qubits (quantum computing)
qudit states
Tillämpad matematik
Upper bounds
Violations
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Summary:We introduce the general class of symmetric two-qubit states guaranteeing the perfect correlation or anticorrelation of Alice and Bob outcomes whenever some spin observable is measured at both sites. We prove that, for all states from this class, the maximal violation of the original Bell inequality is upper bounded by 3 2 and specify the two-qubit states where this quantum upper bound is attained. The case of two-qutrit states is more complicated. Here, for all two-qutrit states, we obtain the same upper bound 3 2 for violation of the original Bell inequality under Alice and Bob spin measurements, but we have not yet been able to show that this quantum upper bound is the least one. We discuss experimental consequences of our mathematical study.
ISSN:1099-4300
1099-4300
DOI:10.3390/e20110829