Coherent optical control of the spin of a single hole in a quantum dot
  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. 
T. M. Godden, J. H. Quilter, A. J. Ramsay, Yanwen Wu, P. Brereton, S.   J. Boyle, I. J. Luxmoore, J. Puebla-Nunez, A. M. Fox...
cond-mat.mes-hall