  We examine the possibility of storing and retrieving a single photon using
electromagnetically induced transparency (EIT). We consider the theory of a
proof of principle two-photon interference experiment, in which an atomic vapor
cell is placed in one arm of a two-photon interferometer. Since the two-photon
state is entangled, we can examine the degree to which entanglement survives.
We show that while the experiment might be difficult, it should be possible to
perform. We also show that the two-photon interference pattern has oscillatory
behavior. pacs 42.50.Ct, 42.50.Dv, 42.50.Gy, 42.50.St
