  We demonstrate negative polarization created by light-hole exciton excitation
in g-factor engineered GaAs quantum wells measured by time-resolved Kerr
rotation and polarization-resolved photoluminescence. This negative
polarization is a result of polarization transfer from a photon to an electron
spin mediated by a light hole. This demonstration is an important step towards
achieving quantum media conversion from a photonic qubit to an electron spin
qubit required for building a quantum repeater.
