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Two-photon quantum interference in plasmonics: theory and applications.

S Dutta Gupta, G S Agarwal

    Optics Letters
    |February 25, 2014
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    Summary
    This summary is machine-generated.

    We achieved perfect two-photon quantum interference in plasmonic structures, overcoming absorption losses. This breakthrough utilizes destructive interference and coincidence measurements for enhanced resolution in quantum optics research.

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    Area of Science:

    • Quantum Optics
    • Plasmonics
    • Nanophotonics

    Background:

    • Plasmonic systems typically suffer from absorption-induced loss, limiting quantum coherence.
    • Achieving high-visibility quantum interference in such systems is challenging.

    Purpose of the Study:

    • To demonstrate perfect two-photon quantum interference in a resonant tunneling plasmonic structure.
    • To investigate the underlying mechanisms for maintaining quantum coherence despite plasmonic losses.
    • To showcase the utility of coincidence measurements for high-resolution spectroscopic analysis.

    Main Methods:

    • Utilized a resonant tunneling plasmonic structure in folded Kretschmann geometry.
    • Performed two-photon quantum interference experiments.
    • Employed coincidence measurements for detailed analysis.
    • Conducted angle-resolved and frequency-resolved studies.

    Main Results:

    • Achieved near-unity visibility in two-photon quantum interference.
    • Identified perfect destructive interference of amplitude reflection and transmission coefficients as the key mechanism.
    • Demonstrated superior resolution of coincidence measurements compared to standard spectroscopy.
    • Observed finer spectral and angular features using coincidence detection.

    Conclusions:

    • Perfect quantum interference is achievable in plasmonic systems by exploiting specific interference phenomena.
    • Coincidence measurements offer a powerful, high-resolution tool for probing quantum optical effects in nanostructures.
    • This work opens new avenues for quantum information processing and sensing with plasmonic devices.