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    Quantum illumination using entangled photons enhances object detection sensitivity. This quantum correlation method effectively detects low-reflectivity objects even in noisy environments, proving robust against losses and depolarization.

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    Area of Science:

    • Quantum optics
    • Quantum information science

    Background:

    • Conventional illumination methods struggle with detecting low-reflectivity objects and are susceptible to noise.
    • Quantum illumination leverages quantum correlations to overcome these limitations, enhancing detection sensitivity.

    Purpose of the Study:

    • To experimentally demonstrate the advantages of polarization-entangled photon pairs for quantum illumination.
    • To assess the robustness of quantum correlation measures against noise, losses, and depolarization.
    • To showcase the practical feasibility of quantum illumination for real-time applications.

    Main Methods:

    • Utilizing polarization-entangled photon pairs for illuminating reflecting objects.
    • Employing CHSH value and normalized CHSH value as quantum correlation measures.
    • Quantifying detection capabilities with low reflectivity objects and in high-noise environments.

    Main Results:

    • Successfully detected objects with reflectivity as low as 0.05.
    • Achieved detection of an object in noise with a signal-to-noise ratio of 0.003.
    • Demonstrated the robustness of the normalized CHSH value against photon attenuation and depolarization.

    Conclusions:

    • Quantum illumination with entangled photons significantly enhances object detection sensitivity and noise resilience.
    • Quantum correlation measures, particularly the normalized CHSH value, are robust and practical for real-world applications.
    • This technology holds promise for improved sensing and imaging in challenging conditions.