title: Fast spin state initialization in a singly charged InAs-GaAs quantum dot by optical cooling.
abstract: Quantum computation requires a continuous supply of rapidly initialized qubits for quantum error correction. Here, we demonstrate fast spin state initialization with near unity efficiency in a singly charged quantum dot by optically cooling an electron spin. The electron spin is successfully cooled from 5 to 0.06 K at a magnetic field of 0.88 T applied in Voigt geometry. The spin cooling rate is of order 10(9) s-1, which is set by the spontaneous decay rate of the excited state.
authors.affiliation: The H.M. Randall Laboratory of Physics, The University of Michigan, Ann Arbor, Michigan 48109, USA.
authors.forename: Xiaodong
authors.initials: X
authors.lastname: Xu
authors.forename: Yanwen
authors.initials: Y
authors.lastname: Wu
authors.forename: Bo
authors.initials: B
authors.lastname: Sun
authors.forename: Qiong
authors.initials: Q
authors.lastname: Huang
authors.forename: Jun
authors.initials: J
authors.lastname: Cheng
authors.forename: D G
authors.initials: DG
authors.lastname: Steel
authors.forename: A S
authors.initials: AS
authors.lastname: Bracker
authors.forename: D
authors.initials: D
authors.lastname: Gammon
authors.forename: C
authors.initials: C
authors.lastname: Emary
authors.forename: L J
authors.initials: LJ
authors.lastname: Sham