T. M. Godden, J. H. Quilter, A. J. Ramsay, Yanwen Wu, P. Brereton, I. J. Luxmoore, J. Puebla, A. M. Fox, M. S. Skolnick
The preparation of a coherent heavy-hole spin via ionization of a spin-polarized electron-hole pair in an InAs/GaAs quantum dot in a Voigt geometry magnetic field is investigated. For a dot with a 17 ueV bright-exciton fine-structure splitting, the fidelity of the spin preparation is limited to 0.75, with optimum preparation occurring when the effective fine-structure of the bright-exciton matches the in-plane hole Zeeman energy. In principle, higher fidelities can be achieved by minimizing the bright-exciton fine-structure splitting.
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http://arxiv.org/abs/1202.5943
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