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Inductively Coupled Plasma Atomic Emission Spectroscopy: Instrumentation01:26

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Wide-range wavelength-tunable photon-pair source for characterizing single-photon detectors.

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    We developed a new method to measure the temporal response of single-photon detectors using photon pairs from spontaneous parametric down-conversion (SPDC). This technique offers wavelength tunability for characterizing detectors across different spectral bands.

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    Area of Science:

    • Quantum Optics
    • Photonics
    • Detector Characterization

    Background:

    • Accurate temporal response measurement is crucial for single-photon detectors.
    • Traditional methods rely on short-pulsed laser sources, which can be limiting.
    • Spontaneous parametric down-conversion (SPDC) is a key quantum optical process.

    Purpose of the Study:

    • To present an alternative method for determining the temporal response of single-photon detectors.
    • To utilize time-correlated photon pairs generated via SPDC for detector characterization.
    • To demonstrate wavelength tunability of the photon source for broad detector applicability.

    Main Methods:

    • Generating time-correlated photon pairs using spontaneous parametric down-conversion (SPDC).
    • Measuring the cross-correlation of detection times between an unknown and a reference photodetector.
    • Tuning the SPDC phase-matching conditions to achieve wavelength tunability.

    Main Results:

    • Successfully extracted the temporal response function of unknown detectors.
    • Achieved continuous wavelength tunability from 526 nm to 661 nm for one photon and 1050 nm to 1760 nm for the other.
    • Demonstrated characterization of Silicon and Indium Gallium Arsenide single-photon avalanche detectors.

    Conclusions:

    • The SPDC-based photon pair source offers a versatile and wavelength-tunable alternative for single-photon detector temporal response measurement.
    • This method provides access to a wide spectral range, enabling the characterization of diverse detector technologies.
    • The approach is adaptable for even broader wavelength coverage by altering the pump laser source.