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    We achieved noiseless frequency up-conversion of photons, eliminating background noise. This breakthrough enables highly sensitive single-photon detection and advances quantum information processing.

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    Area of Science:

    • Quantum optics
    • Nonlinear optics
    • Photonics

    Background:

    • Frequency up-conversion is crucial for detecting low-energy photons using higher-energy detectors.
    • Existing methods often suffer from background noise and limited dynamic range.
    • Achieving noiseless up-conversion is a key challenge for quantum technologies.

    Purpose of the Study:

    • To demonstrate statistically noiseless frequency up-conversion of photons.
    • To achieve a wide dynamic range for the up-conversion process.
    • To explore the feasibility of up-converting entangled photon pairs without introducing noise.

    Main Methods:

    • Utilizing periodically poled lithium niobate waveguides for frequency conversion.
    • Pumping the waveguides with a 1550 nm laser to convert 920 nm near-infrared photons to 577 nm visible light.
    • Employing an up-converting Mach-Zehnder interferometer to assess phase preservation at the single-photon level.

    Main Results:

    • Demonstrated up-conversion with no statistically significant background photons.
    • Achieved an unprecedented dynamic range of 15 decades.
    • Reported high phase preservation (fringe visibilities ≥ 0.97) at the single-photon level.
    • Confirmed the photon-number preserving property of the up-converter.

    Conclusions:

    • The developed background-free up-conversion process enables single-photon detection with no intrinsic dark counts.
    • This technique is compatible with entangled photon pairs, paving the way for noiseless quantum information processing.
    • The high degree of phase preservation is critical for maintaining quantum correlations in up-converted photons.