Limited preparation contextuality in quantum theory and its relation to the Cirel'son bound

Abstract

Kochen-Specker (KS) theorem lies at the heart of the foundations of quantum mechanics. It establishes impossibility of explaining predictions of quantum theory by any noncontextual ontological model. Spekkens generalized the notion of KS contextuality in [Phys. Rev. A 71, 052108 (2005)] for arbitrary experimental procedures (preparation, measurement, and transformation procedure). Interestingly, later on it was shown that preparation contextuality powers parity-oblivious multiplexing [Phys. Rev. Lett. 102, 010401 (2009)], a two party information theoretic game. Thus, using resources of a given operational theory, the maximum success probability achievable in such a game suffices as a \emph{bona-fide} measure of preparation contextuality for the underlying theory. In this work we show that preparation contextuality in quantum theory is more restricted compared to a general operational theory known as \emph{box world}. Moreover, we find that this limitation of quantum theory implies the quantitative bound on quantum nonlocality as depicted by the Cirel'son bound.

(5+4) pages; Accepted in Phys. Rev. A (Rapid Communication). arXiv admin note: text overlap with arXiv:0805.1463 by other authors

References in corpus (6)

• Steering, Entanglement, Nonlocality, and the EPR Paradox
• Hidden Variables and the Two Theorems of John Bell
• The uncertainty principle determines the non-locality of quantum mechanics
• Preparation contextuality powers parity-oblivious multiplexing
• From the Kochen-Specker theorem to noncontextuality inequalities without assuming determinism
• Exclusivity principle and the quantum bound of the Bell inequality

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