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Updated: Sep 25, 2025

Measurement of Coherence Decay in GaMnAs Using Femtosecond Four-wave Mixing
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Superior atomic coherence time controlled by crystal phase transition and optical dressing.

Jinyang Li, Jianfeng Zhu, Muhammad Imran

    Optics Letters
    |April 29, 2022
    PubMed
    Summary

    Bismuth phosphate doped with europium (BiPO4: Eu3+) crystals show the longest atomic coherence time. Optimizing crystal properties achieved a record 10 ms coherence time for quantum memory applications.

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    Area of Science:

    • Solid-state physics
    • Quantum optics
    • Materials science

    Background:

    • Atomic coherence time is crucial for quantum technologies.
    • Crystal field splitting and optical dressing influence coherence.
    • Previous doped ion crystals have limitations.

    Purpose of the Study:

    • Compare atomic coherence times in various doped ion crystals.
    • Identify factors controlling atomic coherence time.
    • Achieve superior atomic coherence time in BiPO4: Eu3+ for quantum memory.

    Main Methods:

    • Investigated doped ion crystals: BiPO4: Eu3+, YPO4: Eu3+, YPO4: Pr3+, Y2SiO5: Pr3+.
    • Analyzed control by crystal field splitting and optical dressing.
    • Optimized phonon control, excitation methods, and fluorescence/S-FWM ratios.

    Main Results:

    • BiPO4: Eu3+ exhibited the longest coherence time among tested crystals.
    • Achieved a superior atomic coherence time of 10 ± 0.6 ms in hexagonal BiPO4: Eu3+.
    • Investigated the relationship between TAT-splitting and spectral Autler-Townes (SAT)-splitting.

    Conclusions:

    • BiPO4: Eu3+ is a promising material for long coherence times.
    • Optimized conditions significantly enhance atomic coherence.
    • This advancement has potential applications in quantum memory devices.