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We describe a quantum memory spectral preparation strategy that maximisesmemory efficiency and bandwidth in materials such as 167 Er3+:Y2SiO5 in a highfield regime, where the hyperfine structure is resolved. We demonstrate themethod in 167 Er3+:Y2SiO5 by preparing spectrally isolated 18 dB-absorbingfeatures on a < 1 dB background. Using these features we create an atomicfrequency comb and show quantum storage of 200 ns pulses with 22% efficiency,limited by the background absorption which arises from laser instability. Wedescribe the experimental improvements needed to reach the material limits:O(1) s spin state storage, O(100) MHz bandwidth, and > 90% efficiency.

Initialisation protocol for efficient quantum memories using resolved hyperfine structure