Using the no-signaling condition for constraining the nonidealness of a Stern-Gerlach set-up

Abstract

On the basis of a variant of the EPR-Bohm example, we show that the no-signaling condition can be employed as a useful tool for deriving a constraint on a suitably defined measure of the 'nonidealness' of a Stern-Gerlach (SG) set-up. In this demonstration, a key ingredient is provided by the characteristics of the exact solution of the time-dependent Schrodinger equation as applied to a most general SG set-up.