Controlling quantum fluctuations by electromagnetic field induced coherences

It is well established that a Λ-system under the action of two intense fields and in the absence of collisions ends up in a state known as coherent population trapping state (CPT state). This state has well defined coherence between the two lower levels of the Λ-system and has found many different applications. In this paper I demonstrate the utility of this coherence in controlling quantum fluctuations