Reversible storage of entangled two-mode wavepacket based on electromagnetically induced transparency

We discuss the reversible storage of an entangled two-mode wavepacket in separated two atomic ensembles based on electromagnetically induced transparency. By introducing wavepacket dark-states, we show the dynamic transfer of quantum information of the wavepacket between the optical field and the atomic ensembles. We examine in detail the performance of the scheme focusing on the reversible storage of an entangled two-photon wavepacket in the case where the effects of the environment and the thermal motions of atoms are taken into consideration.