Contextuality-by-Default 2.0: Systems with Binary Random Variables

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• 关键词：Contextuality ; Connection ; Consistent connectedness ; Cyclic system ; Inconsistent connectedness ; Maximal coupling ; Multimaximal coupling
• 刊名：Lecture Notes in Computer Science
• 出版年：2017
• 出版时间：2017
• 年：2017
• 卷：10106
• 期：1
• 页码：16-32
• 丛书名：Quantum Interaction
• ISBN：978-3-319-52289-0
• 卷排序：10106

文摘

The paper outlines a new development in the Contextuality-by-Default theory as applied to finite systems of binary random variables. The logic and principles of the original theory remain unchanged, but the definition of contextuality of a system of random variables is now based on multimaximal rather than maximal couplings of the variables that measure the same property in different contexts: a system is considered noncontextual if these multimaximal couplings are compatible with the distributions of the random variables sharing contexts. A multimaximal coupling is one that is a maximal coupling of any subset (equivalently, of any pair) of the random variables being coupled. Arguments are presented for why this modified theory is a superior generalization of the traditional understanding of contextuality in quantum mechanics. The modified theory coincides with the previous version in the important case of cyclic systems, which include the systems whose contextuality was most intensively studied in quantum physics and behavioral sciences.