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We present an efficient photon-echo experiment based on atomic frequencycombs [Phys. Rev. A 79, 052329 (2009)]. Echoes containing an energy of up to35% of that of the input pulse are observed in a Pr3+-doped Y2SiO5 crystal.This material allows for the precise spectral holeburning needed to make asharp and highly absorbing comb structure. We compare our results with a simpletheoretical model with satisfactory agreement. Our results show that atomicfrequency combs has the potential for high-efficiency storage of single photonsas required in future long-distance communication based on quantum repeaters.

Towards an eficient atomic frequency comb quantum memory