Improved selection of dark states in the presence of drive-induced dissipation.*

We revisit the coherent population trapping (CPT) of a three-state system in the

presence of environmental fluctuations and strong electromagnetic driving fields. To this end, we

use a fluctuation-regulated quantum master equation that takes into account the drive-induced

dissipation (DID) in the system. DID originates from the combined effect of a driving field and

environmental fluctuations. We report that increasing DID shows a narrowing of CPT linewidth

and hence improved selection of the dark states. As such, the DID enhances the sensitivity of

CPT at a driving strength much larger than the system’s relaxation rates. We also discuss the

practical implementation of the scheme along with possible applications.