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We consider the initialization of the spin-state of a single electron trappedin a self-assembled quantum dot via optical pumping of a trion level. We showthat with a magnetic field applied perpendicular to the growth direction of thedot, a near-unity fidelity can be obtained in a time equal to a few times theinverse of the spin-conserving trion relaxation rate. This method is severalorders-of-magnitude faster than with the field aligned parallel, since thisconfiguration must rely on a slow hole spin-flip mechanism. This increase inspeed does result in a limit on the maximum obtainable fidelity, but we showthat for InAs dots, the error is very small.Comment: 4 pages, 4 figure

Fast Initialization of the Spin State of an Electron in a Quantum Dot in the Voigt Configuration