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Time reversibility is absent from some recently proposed quantum memoryprotocols such as Absorption Frequency Comb (AFC). Focusing on AFC memory, weshow that quantum efficiency and fidelity are reduced dramatically, as aconsequence of non-reversibility, when the spectral width of the incomingsignal approaches the memory bandwidth. Non-reversibility is revealed throughspectral dispersion, giving rise to phase mismatching. We propose a modifiedAFC scheme that restores reversibility. This way, signals can be retrieved withexcellent efficiency over the entire memory bandwidth. This study could beextended to other quantum memory rephasing schemes in inhomogeneously broadenedabsorbing media.

Rephasing processes and quantum memory for light: reversibility issues and how to fix them