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Imperfect-interaction-free entanglement purification on stationary systems for solid quantum repeaters.

Guan-Yu Wang, Qing Ai, Fu-Guo Deng

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    We developed an imperfect-interaction-free entanglement purification technique for solid quantum repeaters. This method uses faithful parity checks on electron spins to improve entanglement quality for large-scale quantum networks.

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    Area of Science:

    • Quantum Information Science
    • Quantum Networking
    • Solid-State Quantum Systems

    Background:

    • Solid quantum repeaters are essential for building large-scale quantum networks.
    • Entanglement purification is crucial for quantum repeaters to distill high-fidelity entanglement and mitigate noise.
    • Existing methods face challenges with imperfect interactions and noise in realistic conditions.

    Purpose of the Study:

    • To present an imperfect-interaction-free entanglement purification scheme for nonlocal electron spins in quantum dots.
    • To enhance the fidelity of nonlocal entanglement for solid quantum repeaters.
    • To relax experimental requirements for practical quantum network implementation.

    Main Methods:

    • Utilizing a faithful parity check on electron spins within quantum dots.
    • Implementing entanglement purification under nearly realistic conditions with imperfect light-matter interaction.
    • Employing quantum dots embedded inside a microcavity interacting with circularly polarized photons.

    Main Results:

    • Demonstrated successful parity determination without destroying nonlocal solid entanglement, even with imperfect interactions.
    • Prevented maximally entangled states from degrading into partially entangled states.
    • Guaranteed the fidelity of nonlocal mixed states to a desired level post-purification.

    Conclusions:

    • The proposed imperfect-interaction-free entanglement purification scheme is feasible under realistic conditions.
    • This technique offers a practical approach to improving entanglement quality for solid quantum repeaters.
    • The relaxed experimental requirements pave the way for more accessible large-scale quantum networks.