Initialization protocol for efficient quantum memories using resolved hyperfine structure
Date
2021
Authors
Stuart, James
Hedges, Morgan
Ahlefeldt, Rose
Sellars, Matthew
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American Physical Society
Abstract
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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Physical Review Research
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Journal article
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Open Access
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Creative Commons Attribution 4.0 International License
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