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.

4 pages, 4 figures

References in corpus (3)

• Stimulated and spontaneous optical generation of electron spin coherence in charged GaAs quantum dots
• All-electronic coherent population trapping in quantum dots
• Quantum Computing with Spin Qubits Interacting Through Delocalized Excitons: Overcoming Hole Mixing

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• Optical pumping and initialization of a hole spin in site-controlled InGaAs pyramidal quantum dots
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• Resonant two-laser spin-state spectroscopy of a negatively charged quantum dot-microcavity system with a cold permanent magnet
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