We demonstrate coherent optical control of a single hole spin confined to an InAs/GaAs quantum dot. A superposition of hole spin states is created by fast (10-100 ps) dissociation of a spin-polarized electron-hole pair. Full control of the hole-spin is achieved by combining coherent rotations about two axes: Larmor precession of the hole-spin about an external Voigt geometry magnetic field, and rotation about the optical-axis due to the geometric phase shift induced by a picosecond laser pulse resonant with the hole-trion transition.
@article{arxiv.1106.6282,
title = {Coherent optical control of the spin of a single hole in a quantum dot},
author = {T. M. Godden and J. H. Quilter and A. J. Ramsay and Yanwen Wu and P. Brereton and S. J. Boyle and I. J. Luxmoore and J. Puebla-Nunez and A. M. Fox and M. S. Skolnick},
journal= {arXiv preprint arXiv:1106.6282},
year = {2012}
}
Comments
6 pages, 3 figs, include supplement, final version