title: Mode locking of electron spin coherences in singly charged quantum dots.
abstract: The fast dephasing of electron spins in an ensemble of quantum dots is detrimental for applications in quantum information processing. We show here that dephasing can be overcome by using a periodic train of light pulses to synchronize the phases of the precessing spins, and we demonstrate this effect in an ensemble of singly charged (In,Ga)As/GaAs quantum dots. This mode locking leads to constructive interference of contributions to Faraday rotation and presents potential applications based on robust quantum coherence within an ensemble of dots.
authors.affiliation: Experimentelle Physik II, Universität Dortmund, D-44221 Dortmund, Germany.
authors.forename: A
authors.initials: A
authors.lastname: Greilich
authors.forename: D R
authors.initials: DR
authors.lastname: Yakovlev
authors.forename: A
authors.initials: A
authors.lastname: Shabaev
authors.forename: Al L
authors.initials: AL
authors.lastname: Efros
authors.forename: I A
authors.initials: IA
authors.lastname: Yugova
authors.forename: R
authors.initials: R
authors.lastname: Oulton
authors.forename: V
authors.initials: V
authors.lastname: Stavarache
authors.forename: D
authors.initials: D
authors.lastname: Reuter
authors.forename: A
authors.initials: A
authors.lastname: Wieck
authors.forename: M
authors.initials: M
authors.lastname: Bayer