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    Area of Science:

    • Quantum Optics
    • Photonics
    • Quantum Information Science

    Background:

    • Heralded single photons are vital for quantum technologies.
    • Achieving high spectral purity is a key challenge in photon generation.

    Purpose of the Study:

    • To develop a heralded single-photon source with near-unity spectral purity.
    • To demonstrate the suitability of the generated photons for quantum applications.

    Main Methods:

    • Utilized pulsed spontaneous parametric down-conversion (SPDC) in KTiOPO 4.
    • Employed a Gaussian phase-matching function and a transform-limited Gaussian pump.
    • Verified spectral purity via Hong-Ou-Mandel interference of heralded photons.

    Main Results:

    • Achieved near-unity spectral purity in heralded single photons at telecommunication wavelengths.
    • Demonstrated a Hong-Ou-Mandel interference visibility of 98.4±1.1%.
    • Calculated a heralded-state purity of 99.2% with mild spectral filtering.

    Conclusions:

    • The developed heralded single-photon source exhibits exceptional spectral purity.
    • This source is a promising resource for measurement-based quantum computing and quantum networks.