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Initialization protocol for efficient quantum memories using resolved hyperfine structure
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DOI：10.1103/PhysRevResearch.3.L032054.png)
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Abstract
En 中文
We describe a quantum memory spectral preparation strategy that optimizes memory efficiency and bandwidth in materials such as Er-167(3+):Y2SiO5 in a high-field regime, where the hyperfine structure is resolved. We demonstrate the method in 167 Er-167(3+):Y2SiO5 by preparing spectrally isolated 18-dB-absorbing features on a <1 dB background. Using these features we create an atomic frequency comb and show a quantum storage of 200-ns pulses with 22% efficiency, limited by the background absorption which arises from laser instability. We describe the experimental improvements needed to reach the material limits: O(1)-s spin-state storage, O(100) MHz bandwidth, and >90% efficiency.
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