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    Researchers achieved high-efficiency storage and retrieval of optical pulses and photonic qubits using a cavity-enhanced solid-state quantum memory. This breakthrough advances quantum memory technology for future quantum networks.

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    Area of Science:

    • Quantum Information Science
    • Solid-State Physics
    • Quantum Optics

    Background:

    • Quantum memories are crucial for quantum communication and computation.
    • Solid-state systems offer robust platforms for quantum information processing.
    • Cavity enhancement can significantly improve the performance of quantum memories.

    Purpose of the Study:

    • To demonstrate high-efficiency storage and retrieval of weak coherent optical pulses and photonic qubits.
    • To investigate the role of cavity enhancement in a solid-state quantum memory.
    • To achieve efficient storage of time-bin qubits using an atomic frequency comb scheme.

    Main Methods:

    • Utilized an atomic frequency comb (AFC) memory in a Pr3+:Y2SiO5 crystal.
    • Embedded the crystal within an impedance-matched cavity.
    • Stored weak coherent pulses at the single-photon level and time-bin qubits.

    Main Results:

    • Achieved up to 62% storage efficiency for weak coherent pulses at the single-photon level with a 2 µs storage time.
    • Demonstrated enhanced efficiency for longer storage times up to 70 µs due to cavity enhancement.
    • Stored weak coherent time-bin qubits with a record 51 ± 2% efficiency and >94.8% fidelity.

    Conclusions:

    • The cavity-enhanced AFC quantum memory in Pr3+:Y2SiO5 provides high-efficiency storage and retrieval of optical pulses and photonic qubits.
    • Impedance matching of the cavity is critical for enhancing storage efficiency, especially for longer durations.
    • The demonstrated performance, though limited by qubit creation/measurement imperfections, represents a significant advancement in solid-state quantum memory capabilities.