Quantum non-locality in two three-level systems

Abstract

Recently a new Bell inequality has been introduced (CGLMP,KKCZO) that is strongly resistant to noise for maximally entangled states of two $d$-dimensional quantum systems. We prove that a larger violation, or equivalently a stronger resistance to noise, is found for a non-maximally entangled state. It is shown that the resistance to noise is not a good measure of non-locality and we introduce some other possible measures. The non-maximally entangled state turns out to be more robust also for these alternative measures. From these results it follows that two Von Neumann measurements per party may be not optimal for detecting non-locality. For $d=3,4$, we point out some connections between this inequality and distillability. Indeed, we demonstrate that any state violating it, with the optimal Von Neumann settings, is distillable.

9 pages, 1 table, 1 figure. An example is included showing that the resistance to noise is not a good measure of non-locality

References in corpus (3)

• Bell inequalities for arbitrarily high dimensional systems
• Multipartite bound entangled states that violate Bell's inequality
• A note on bound entanglement and local realism

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