title: Atomic coherence swing in a double-Lambda-type system using ultraslow light.
abstract: Using an ultraslow light-based double-Lambda-type configuration we demonstrate atomic coherence swing between two different frequencies in a nondegenerate four-wave mixing scheme. A short control pulse applied to the middle of an ultraslow light envelope results in coherence conversion between two ground states, causing both coherence depletion and recovery, resulting in a temporal hole and amplification in the ultraslow light envelope. This outcome holds potential for temporally and spatially localized coherence control of ultraslow light in such applications as a selective photon trap.
authors.affiliation: Center for Photon Information Processing, Graduate School of Information and Telecommunications, Inha University, Incheon, South Korea. bham@inha.ac.kr
authors.forename: Byoung S
authors.initials: BS
authors.lastname: Ham
authors.forename: Joonsung
authors.initials: J
authors.lastname: Hahn