Role of externally induced coherent superposition in demonstrating quantum nonlocality in a correlated emission laser

Analysis of the effects of external pumping on the quantum features, including entanglement, quantum nonlocality and nonclassical photon number correlations, of the cavity radiation of a correlated emission laser is presented. It turns out that the contribution of externally induced coherent superposition in demonstrating quantum nonlocality is significant. Despite the available evidence that entangled states can exhibit nonlocality for certain values of the rate at which the atoms are injected into the cavity and amplitude of the driving radiation, a direct relation between the degree of entanglement and quantum nonlocality cannot be established. However, it seems likely to make a consistent connection between the Cauchy–Schwarz and Bell–Clauser–Horne–Shimony–Holt inequalities. It is evident that comparison among various nonclassical correlations enhances the understanding of the otherwise intricate quantum theoretical predictions.