  We present a microscopic theory of optical initialization, control and
detection for a single electron spin in a quantum dot embedded into a
zero-dimensional microcavity. The strong coupling regime of the trion and the
cavity mode is addressed. We demonstrate that efficient spin orientation by a
single circularly polarized pulse is possible in relatively weak transverse
magnetic fields. The possibilities for spin control by additional circularly
polarized pulse are analyzed. Under optimal conditions the Kerr and Faraday
rotation angles induced by the spin polarized electron may reach tens of
degrees.
