Relevant multi-setting tight Bell inequalities for qubits and qutrits

TL;DR

This paper develops new multi-setting tight Bell inequalities for qubits and qutrits, extending previous methods and demonstrating their relevance and maximal violation by certain entangled states.

Contribution

It introduces novel multi-setting tight Bell inequalities for qubits and qutrits, including the first three-setting inequality for two qutrits, based on generalized construction methods.

Findings

New multi-setting Bell inequalities relevant to CHSH and CG inequalities.

First three-setting tight Bell inequality for two qutrits.

Maximal violation achieved by nonmaximally entangled states.

Abstract

In the celebrated paper [J. Phys. A: Math. Gen. 37, 1775 (2004)], D. Collins and N. Gisin presented for the first time a three setting Bell inequality (here we call it CG inequality for simplicity) which is relevant to the Clauser-Horne-Shimony-Holt (CHSH) inequality. Inspired by their brilliant ideas, we obtained some multi-setting tight Bell inequalities, which are relevant to the CHSH inequality and the CG inequality. Moreover, we generalized the method in the paper [Phys.Rev. A 79, 012115 (2009)] to construct Bell inequality for qubits to higher dimensional system. Based on the generalized method, we present, for the first time, a three setting tight Bell inequality for two qutrits, which is maximally violated by nonmaximally entangled states and relevant to the Collins-Gisin- Linden-Massar-Popescu inequality.