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Related Experiment Video

Updated: Jun 20, 2026

New Framework for Understanding Cross-Brain Coherence in Functional Near-Infrared Spectroscopy (fNIRS) Hyperscanning Studies
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Coherence and indistinguishability.

L Mandel

    Optics Letters
    |September 29, 2009
    PubMed
    Summary
    This summary is machine-generated.

    The degree of photon indistinguishability directly equals the degree of light beam coherence. This finding establishes a fundamental link between the wave and particle descriptions of light.

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    Area of Science:

    • Quantum optics
    • Wave-particle duality

    Background:

    • Interference of light beams is known to depend on coherence and photon path indistinguishability.
    • The relationship between these factors has been a subject of study in quantum mechanics.

    Purpose of the Study:

    • To establish a fundamental link between the degree of coherence and the degree of indistinguishability of photon paths.
    • To connect wave and particle descriptions of light through a quantifiable relationship.

    Main Methods:

    • Utilized a decomposition of the density operator.
    • Analyzed the mathematical relationship between coherence and indistinguishability.

    Main Results:

    • Demonstrated that the degree of indistinguishability is precisely equal to the degree of coherence.
    • Provided a quantitative basis for the connection between wave and particle properties.

    Conclusions:

    • The study confirms a deep connection between the coherence of light beams and the indistinguishability of photon paths.
    • This work offers a unified perspective on the wave-particle duality of light.