TESTING BELLS-INEQUALITY USING THE AHARONOV-CASHER EFFECT

We propose the Aharonov-Casher (AC) effect for four entangled spin-1/2 particles carrying magnetic moments in the presence of impenetrable l ine charge. The four-particle state undergoes an AC phase shift in two causally disconnected regions, which can show up in the correlations between different spin states of distant particles. This correlation c an violate Bell's inequality, thus displaying the nonlocality for four -particle entangled states in an objective way.