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As the superposition principle is basic to quantum mechanics,the interference effects occur very widely in quantum systems.Interferences are especially important in quantum optics and I will demonstrate how interferences are the key to understand superradiance.I will show that the entangled character of the Dicke states leads to many interfering paths which determine the probability of photon emission.Since Dicke states are multiparticle states,their production remains a challenge and has been realized for few atoms.