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Entanglement improvement via a single-side squeezing-based quantum scissors.

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    Area of Science:

    • Quantum Physics
    • Quantum Information Science

    Background:

    • Quantum entanglement is a fundamental resource for quantum information processing.
    • Two-mode squeezed vacuum states (TMSV) are crucial for generating entanglement.
    • Quantum scissors (QS) are tools for manipulating quantum states, including entanglement.

    Purpose of the Study:

    • To theoretically investigate entanglement improvement using a single-side quantum scissors (SSQS) with local squeezing and asymmetric beam splitters (BSs).
    • To explore the impact of local squeezing parameters and BS transmissivity on entanglement enhancement.
    • To assess the robustness of the proposed scheme against photon loss.

    Main Methods:

    • Theoretical analysis of quantum entanglement.
    • Application of a single-side quantum scissors (SSQS) to a two-mode squeezed vacuum state (TMSV).
    • Inclusion of local squeezing operations and two asymmetrical beam splitters (BSs).

    Main Results:

    • Entanglement gain is significantly enhanced by increasing the local squeezing parameter, though success probability decreases.
    • Entanglement can be further improved by adjusting local squeezing or BS transmissivity in a small initial squeezing region.
    • The scheme demonstrates robustness against photon loss in TMSV, with local squeezing enhancing the improvement effect.

    Conclusions:

    • Squeezing-based SSQS at the single-photon level effectively improves quantum entanglement.
    • Asymmetric BSs contribute positively to entanglement improvement in both ideal and realistic scenarios.
    • The proposed method holds potential for applications in quantum communication due to enhanced entanglement.