The bell inequality: A measure of entanglementa?

W. J. Munro Special Research Centre for Quantum Computer Technology, The University of Queensland, Brisbane, Australia; Hewlett-Packard Laboratories, Filton Road, Stoke Gifford, Bristol, BS34 8QZ, UK E-mail: [email protected]

K. Nemoto Special Research Centre for Quantum Computer Technology, The University of Queensland, Brisbane, Australia

A. G. White Special Research Centre for Quantum Computer Technology, The University of Queensland, Brisbane, Australia

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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