  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.
