Fast initialization of the spin state of an electron in a quantum dot in the Voigt configuration

Details Fast initialization of the spin state of an electron in a quantum dot in the Voigt configuration Fast initialization of the spin state of an electron in a quantum dot in the Voigt configuration

2006-08-09

arxiv.org/abs/cond-mat/0608225v1

Phys. Rev. Lett. 98, 047401 (2007)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.98.047401

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.

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