title: Optical pumping and a nondestructive readout of a single magnetic impurity spin in an InAs/GaAs quantum dot.
abstract: We report on the resonant optical pumping of the | ± 1⟩ spin states of a single Mn dopant in an InAs/GaAs quantum dot which is embedded in a charge tunable device. The experiment relies on a W scheme of transitions reached when a suitable longitudinal magnetic field is applied. The optical pumping is achieved via the resonant excitation of the central Λ system at the neutral exciton X(0) energy. For a specific gate voltage, the redshifted photoluminescence of the charged exciton X- is observed, which allows a nondestructive readout of the spin polarization. An arbitrary spin preparation in the | + 1⟩ or |-1⟩ state characterized by a polarization near or above 50% is evidenced.
authors.affiliation: CNRS-Laboratoire de Photonique et de Nanostructures, Route de Nozay, 91460 Marcoussis, France.
authors.forename: E
authors.initials: E
authors.lastname: Baudin
authors.forename: E
authors.initials: E
authors.lastname: Benjamin
authors.forename: A
authors.initials: A
authors.lastname: Lemaître
authors.forename: O
authors.initials: O
authors.lastname: Krebs