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    Researchers measured fluorescence lifetime using entangled photons and continuous wave lasers, eliminating the need for pulsed lasers. This quantum fluorescence lifetime (Q-FL) method offers a novel approach for fluorescence imaging.

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    Area of Science:

    • Quantum Optics
    • Spectroscopy
    • Materials Science

    Background:

    • Fluorescence lifetime measurements traditionally require pulsed or modulated lasers.
    • Spontaneous parametric downconversion (SPDC) generates entangled photon pairs.
    • Organic dyes like rhodamine 6G are widely used in fluorescence applications.

    Purpose of the Study:

    • To demonstrate fluorescence lifetime measurements using continuous wave (CW) lasers and entangled photons.
    • To introduce a novel quantum fluorescence lifetime (Q-FL) measurement technique.
    • To explore the potential of entangled photon correlations for advanced imaging.

    Main Methods:

    • Utilizing photon pair correlations from SPDC.
    • Employing one entangled photon to excite fluorescence.
    • Timing the fluorescence photon against its entangled partner.
    • Measuring the fluorescence lifetime of rhodamine 6G.

    Main Results:

    • Successfully measured the fluorescence lifetime of rhodamine 6G without pulsed lasers.
    • Demonstrated that entangled photon timing is sufficient to resolve nanosecond fluorescence lifetimes.
    • Showcased the feasibility of Q-FL measurements with CW lasers.

    Conclusions:

    • Entangled photon time correlations can replace pulsed lasers for fluorescence lifetime measurements.
    • The Q-FL method enables fluorescence lifetime measurements with CW lasers.
    • This technique opens new avenues for fluorescence imaging utilizing sub-100 ps photon correlations.