EPR Paradox - The Einstein-Podolsky-Rosen Paradox refers to the dichotomy that either the measurement of a physical quantity in one system must affect the measurement of a physical quantity in another, spatially separate, system or the description of reality given by a wave function must be incomplete. The EPR paradox is an early and influential critique leveled against quantum mechanics. It has been shown that the argument put forward by EPR is flawed in its logic.