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A high-storage efficiency and long-lived quantum memory for photons is anessential component in long-distance quantum communication and optical quantumcomputation. Here, we report a 78% storage efficiency of light pulses in a coldatomic medium based on the effect of electromagnetically induced transparency(EIT). At 50% storage efficiency, we obtain a fractional delay of 74, which isthe best up-to-date record. The classical fidelity of the recalled pulse isbetter than 90% and nearly independent of the storage time, as confirmed by thedirect measurement of phase evolution of the output light pulse with abeat-note interferometer. Such excellent phase coherence between the stored andrecalled light pulses suggests that the current result can be readily appliedto single photon wave packets. Our work significantly advances the technologyof EIT-based optical memory and may find practical applications inlong-distance quantum communication and optical quantum computation.

Coherent Optical Memory with High Storage Efficiency and Large Fractional Delay