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Quantum plasmonic sensing using single photons.

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    Quantum plasmonic sensing using single photons achieves sub-shot-noise detection limits for blood protein concentrations. This quantum technology demonstrates practical sensing capabilities, even with experimental imperfections.

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    Area of Science:

    • Quantum optics
    • Nanophotonics
    • Biosensing

    Background:

    • Quantum technologies promise enhanced sensing by overcoming classical noise limits.
    • Plasmonic sensors offer high sensitivity for detecting analytes.
    • Shot-noise limit is a fundamental barrier in classical measurement precision.

    Purpose of the Study:

    • To investigate quantum plasmonic sensing using single photons.
    • To demonstrate sensing below the shot-noise limit.
    • To assess the sensor's performance with varying analyte concentrations and experimental imperfections.

    Main Methods:

    • Utilized an attenuated total reflection (ATR) configuration in the Kretschmann setup.
    • Employed heralded single photons as the input source.
    • Used a gold film as the plasmonic sensor and a blood protein solution as the analyte.
    • Performed refractive index estimation and statistical error analysis.

    Main Results:

    • Achieved estimation errors below the shot-noise limit.
    • Demonstrated successful sensing of blood protein concentrations.
    • Showed robustness of the sensor performance despite experimental imperfections.

    Conclusions:

    • Quantum plasmonic sensing with single photons is a viable technique for high-precision measurements.
    • The study highlights the potential for practical quantum-enhanced biosensing applications.
    • Further improvements to the setup could enhance the performance and applicability of quantum plasmonic sensors.