title: Biexciton quantum coherence in a single quantum dot.
abstract: Nondegenerate (two-wavelength) two-photon absorption using coherent optical fields is used to show that there are two different quantum mechanical pathways leading to formation of the biexciton in a single quantum dot. Of specific importance to quantum information applications is the resulting coherent dynamics between the ground state and the biexciton from the pathway involving only optically induced exciton/biexciton quantum coherence. The data provide a direct measure of the biexciton decoherence rate which is equivalent to the decoherence of the Bell state in this system, as well as other critical optical parameters.
authors.affiliation: The FOCUS Center, Harrison M. Randall Laboratory, University of Michigan, Ann Arbor, Michigan 48109, USA.
authors.forename: Gang
authors.initials: G
authors.lastname: Chen
authors.forename: T H
authors.initials: TH
authors.lastname: Stievater
authors.forename: E T
authors.initials: ET
authors.lastname: Batteh
authors.forename: Xiaoqin
authors.initials: X
authors.lastname: Li
authors.forename: D G
authors.initials: DG
authors.lastname: Steel
authors.forename: D
authors.initials: D
authors.lastname: Gammon
authors.forename: D S
authors.initials: DS
authors.lastname: Katzer
authors.forename: D
authors.initials: D
authors.lastname: Park
authors.forename: L J
authors.initials: LJ
authors.lastname: Sham