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Time alignment quantum illumination based on single real-time coincidence counting.

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    This study introduces an enhanced quantum illumination protocol using time-correlated twin photons for superior target detection. The new method achieves a higher signal-to-noise ratio in noisy environments compared to existing quantum and classical approaches.

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    Area of Science:

    • Quantum optics
    • Quantum information science
    • Photonics

    Background:

    • Quantum illumination (QI) protocols enhance target detection in noisy environments.
    • Traditional QI methods face limitations in signal-to-noise ratio (SNR) and real-time processing.
    • Strong noise and signal loss are significant challenges in quantum sensing.

    Purpose of the Study:

    • To propose and demonstrate an improved quantum illumination protocol for enhanced target detection and signal reconstruction.
    • To achieve a high signal-to-noise ratio in strong noise environments.
    • To develop a novel quantum sensing method with improved robustness.

    Main Methods:

    • Utilizing time correlation of twin photons generated via spontaneous parametric down-conversion (SPDC).
    • Employing a Hong-Ou-Mandel (HOM) interferometer to align photon times in twin beams.
    • Implementing a single real-time coincidence counting (SRCC) method for signal reconstruction.

    Main Results:

    • Demonstrated real-time detection of quantum information.
    • Achieved a higher SNR compared to conventional pulse radar, standard quantum illumination (QI), and classical illumination (CI) protocols.
    • Showcased strong robustness against noise and signal losses.

    Conclusions:

    • The proposed improved quantum illumination protocol offers significant advantages in target detection under noisy conditions.
    • The novel SRCC method enables real-time quantum information processing with enhanced SNR.
    • This work presents a promising new direction for robust quantum target detection systems.