Simplified Scheme for Test of Quantum Nonlocality Without Using Bell Inequality**The project supported by National Natural Science Foundation of China under Grant No. 60008003, Science Research Foundation of Education Committee of Fujian Province under Grant No. K20004, and Funds from Fuzhou University

Abstract

A simplified scheme is proposed for the test of quantum nonlocality of the type described by Hardy [Phys. Rev. Left. 71 (1993) 1665]. In the scheme two appropriately prepared atoms are simultaneously sent through a cavity and dispersively interact with the cavity field. Then state-selective measurements are performed on these atoms, which may reveal quantum nonlocality without using Bell inequality. We also propose a simple scheme for the generation of multi-atom entangled states.