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    Optimizing initial two-mode squeezing and receiver-side adjustments can mitigate cross talk in quantum networks. This approach enhances the robustness of distributed Gaussian entanglement for scalable quantum information protocols.

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    Area of Science:

    • Quantum Information Science
    • Quantum Optics
    • Quantum Communication

    Background:

    • Two-mode squeezed states are crucial for scalable continuous-variable and hybrid quantum information protocols.
    • Entanglement distribution over noisy channels is a significant challenge in quantum networks.

    Purpose of the Study:

    • To investigate the impact of linear cross talk on distributed two-mode squeezed states.
    • To develop methods for reducing entanglement degradation caused by cross talk in parallel quantum channels.

    Main Methods:

    • Theoretical analysis of two-mode squeezed states propagating through channels with linear cross talk.
    • Optimization of initial squeezing parameters in the presence of cross talk.
    • Simultaneous optimization of relative phase and linear coupling at the receiver.

    Main Results:

    • Optimizing initial squeezing reduces entanglement degradation from small cross talk.
    • Receiver-side optimization, including phase and coupling adjustment, can fully compensate for cross talk in channels with identical transmittance.
    • Significant cross talk compensation is achievable even in realistic channels with similar transmittance values.

    Conclusions:

    • The proposed method of receiver-side mode interference offers an effective alternative to entanglement localization techniques.
    • These findings enable more efficient utilization of multimode continuous-variable photonic entanglement in scalable quantum networks.
    • The research contributes to building more robust and efficient quantum communication systems.