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Updated: Nov 2, 2025

20 mJ, 1 ps Yb:YAG Thin-disk Regenerative Amplifier
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Gigahertz-bandwidth optical memory in Pr3+:Y2SiO5.

M Nicolle, J N Becker, C Weinzetl

    Optics Letters
    |June 15, 2021
    PubMed
    Summary
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    Room temperature atomic frequency comb storage for light.

    Optics letters·2021

    Researchers demonstrated a broadband atomic frequency comb (AFC) rephasing protocol using a Pr3+:Y2SiO5 crystal. This method achieved 10% efficiency for storing broadband light pulses, paving the way for quantum information applications.

    Area of Science:

    • Quantum optics
    • Solid-state quantum memory
    • Atomic frequency comb (AFC) technology

    Background:

    • Broadband light pulse storage is crucial for quantum information processing.
    • Atomic frequency comb (AFC) protocols enable temporal manipulation of light.
    • Pr3+-doped crystals offer suitable optical properties for quantum memory applications.

    Purpose of the Study:

    • To experimentally implement and characterize a broadband AFC rephasing protocol.
    • To explore a novel regime matching photonic bandwidth to material inhomogeneous broadening.
    • To optimize AFC preparation parameters for enhanced storage efficiency and temporal mode capacity.

    Main Methods:

    • Utilized a cryogenically cooled Pr3+:Y2SiO5 crystal.
    • Implemented a broadband AFC rephasing protocol with input pulses matching material broadening (~5 GHz).

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    Last Updated: Nov 2, 2025

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  • Investigated various AFC preparation parameters to optimize performance.

    • Main Results:

    • Achieved a maximum storage efficiency of 10% after a 12.5 ns rephasing time.
    • Demonstrated the storage of up to 12 rephased temporal modes with a suboptimal AFC.
    • Successfully operated in a regime where photonic bandwidth exceeded hyperfine splitting (~10 MHz).

    Conclusions:

    • The study presents a novel broadband AFC implementation for light pulse storage.
    • The results highlight the potential of Pr3+:Y2SiO5 for high-bandwidth quantum memory.
    • Optimized AFC protocols can significantly enhance storage efficiency and temporal mode capacity.