Quantum memory for non-stationary light fields based on controlled   reversible inhomogeneous broadening
  We propose a new method for efficient storage and recall of non-stationary light fields, e.g. single photon time-bin qubits, in optically dense atomic ensembles. Our approach to quantum memory is based on controlled, reversible, inhomogeneous broadening. We briefly discuss experimental realizations of our proposal. 
B. Kraus, W. Tittel, N. Gisin, M. Nilsson, S. Kroll, and J.I. Cirac