Atomic coherence is induced in the multilevel atomic system via strong control field that alters the response of medium to a weak probe laser field .This involves quantum interference in the amplitudes of optical transitions and causes the cancellation of absorption i.e. electromagnetically induced transparency (EIT). When this is achieved light pulses passing through an EIT medium can be slowed down and compressed .In some cases the pulses can even be stopped completely and can then be revived with their original information which is used in many...