2001•Journal of Modern OpticsOpen access

The bell inequality: A measure of entanglementa?

William J. Munro, Kae Nemoto, A. G. White

Abstract

Entanglement is a critical resource used in many current quantum information schemes. As such entanglement has been extensively studied in two qubit systems and its entanglement nature has been exhibited by violations of the Bell inequality. Can the amount of violation of the Bell inequality be used to quantify the degree of entanglement? What do Bell inequalities indicate about the nature of entanglement?

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Key concepts: Quantum entanglement, Bell test experiments, Bell state, Bell's theorem, Measure (data warehouse), Local hidden variable theory, Squashed entanglement, Inequality