  The generation and storage of entangled photons play important roles in
quantum information technique. Spontaneous Raman scattering (SRS) in atomic
ensembles provides a promising method to generate entangled photons capable of
storage. In the past experiments, a spin-wave-photon entangled state is
produced via SRS in an atomic ensemble, with which a pair of entangled photons
is obtained. Here, we report a scheme of simultaneously generating two
spin-wave-photon entangled states in an atomic ensemble by collecting Stokes
photons at two different directions. Based on the obtained two atom-photon
entangled sources, we generate a three-photon GHZ polarization-entangled state
and conditionally prepare a polarization-entangled photon pair, respectively.
