title: Fast initialization of the spin state of an electron in a quantum dot in the Voigt configuration.
abstract: We consider the initialization of the spin state of a single electron trapped in a self-assembled quantum dot via optical pumping of a trion level. We show that with a magnetic field applied perpendicular to the growth direction of the dot, a near-unity fidelity can be obtained in a time equal to a few times the inverse of the spin-conserving trion relaxation rate. This method is several orders of magnitude faster than with the field aligned parallel, since this configuration must rely on a slow hole spin-flip mechanism. This increase in speed does result in a limit on the maximum obtainable fidelity, but we show that for InAs dots, the error is very small.
authors.affiliation: Department of Physics, The University of California-San Diego, La Jolla, California 92093, USA.
authors.forename: C
authors.initials: C
authors.lastname: Emary
authors.forename: Xiaodong
authors.initials: X
authors.lastname: Xu
authors.forename: D G
authors.initials: DG
authors.lastname: Steel
authors.forename: S
authors.initials: S
authors.lastname: Saikin
authors.forename: L J
authors.initials: LJ
authors.lastname: Sham