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Yoshiaki Tsujimoto, Kentaro Wakui, Mikio Fujiwara

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    |November 23, 2021
    PubMed
    Summary
    This summary is machine-generated.

    Researchers generated heralded single photons using spontaneous parametric down-conversion with a 3.2 GHz pump laser. They achieved high-visibility Hong-Ou-Mandel interference, crucial for quantum information processing.

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    Area of Science:

    • Quantum optics
    • Photonic quantum information processing

    Background:

    • Heralded single photons (HSPs) from spontaneous parametric down-conversion (SPDC) are vital for quantum information processing.
    • Increasing HSP generation rates while minimizing higher-order pair creation is essential for large-scale experiments.

    Purpose of the Study:

    • To investigate the impact of high-repetition-rate (GHz) pump lasers on spectral purity for HSP generation.
    • To experimentally demonstrate high-visibility quantum interference using HSPs generated with a GHz-repetition-rate pump.

    Main Methods:

    • Development of a theoretical model to account for detector limitations in high-repetition-rate regimes.
    • Experimental generation of HSPs via SPDC using 3.2 GHz mode-locked pump pulses.
    • Measurement of Hong-Ou-Mandel interference visibility between two independent HSPs.

    Main Results:

    • A theoretical model was developed to analyze the effect of pulse identification limitations on spectral purity.
    • High-visibility Hong-Ou-Mandel interference was experimentally achieved.
    • An interference visibility of 0.88(3) was observed, consistent with theoretical predictions.

    Conclusions:

    • The study validates a model for HSP generation in high-repetition-rate regimes.
    • High-visibility interference demonstrates the feasibility of using GHz-pumped SPDC for quantum information processing.
    • The findings support the use of GHz-repetition-rate lasers for efficient, high-quality heralded single photon sources.