title: Efficient light storage in a Lambda system due to coupling between lower levels.
abstract: We show analytically and numerically that the application, during the storage time, of an additional weak field connecting the lower levels (LLs) of a Lambda system can modify the spin coherence and the amplitude of the retrieved probe without causing distortion. The LL coupling field adds an additional phase-dependent term to the probe propagation equation. The retrieved probe is amplified when the total relative phase Phi=0 or pi and decreased when Phi=pi/2.
authors.affiliation: Department of Chemistry, Bar-Ilan University, Ramat Gan 52900, Israel.
authors.forename: A
authors.initials: A
authors.lastname: Eilam
authors.forename: A D
authors.initials: AD
authors.lastname: Wilson-Gordon
authors.forename: H
authors.initials: H
authors.lastname: Friedmann