title: Time-resolved detection of single-electron interference.
abstract: We demonstrate real-time detection of self-interfering electrons in a double quantum dot embedded in an Aharonov-Bohm interferometer, with visibility approaching unity. We use a quantum point contact as a charge detector to perform time-resolved measurements of single-electron tunneling. With increased bias voltage, the quantum point contact exerts a back-action on the interferometer leading to decoherence. We attribute this to emission of radiation from the quantum point contact, which drives noncoherent electronic transitions in the quantum dots.
authors.affiliation: Solid State Physics Laboratory, ETH Zürich, Zürich, Switzerland. simongus@phys.ethz.ch
authors.forename: S
authors.initials: S
authors.lastname: Gustavsson
authors.forename: R
authors.initials: R
authors.lastname: Leturcq
authors.forename: M
authors.initials: M
authors.lastname: Studer
authors.forename: T
authors.initials: T
authors.lastname: Ihn
authors.forename: K
authors.initials: K
authors.lastname: Ensslin
authors.forename: D C
authors.initials: DC
authors.lastname: Driscoll
authors.forename: A C
authors.initials: AC
authors.lastname: Gossard