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    Researchers demonstrated a quantum detector tomography for an infrared single-photon upconversion detector. This highly efficient detector shows quantum features, enabling applications in quantum information processing and optical quantum state engineering.

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    Area of Science:

    • Quantum optics
    • Quantum information science

    Background:

    • Single-photon detectors are crucial for quantum technologies.
    • Frequency upconversion offers a pathway for detecting infrared photons at visible wavelengths.
    • Characterizing detector performance is essential for reliable quantum information processing.

    Purpose of the Study:

    • To perform a full quantum detector tomography of a synchronously pumped infrared single-photon frequency upconversion detector.
    • To characterize the detector's performance, including detection efficiency and noise levels.
    • To investigate quantum decoherence and manifest the detector's quantum features.

    Main Methods:

    • Experimental implementation of quantum detector tomography.
    • Synchronous pumping of an infrared single-photon frequency upconversion detector.
    • Characterization at varying pump powers.
    • Reconstruction of positive operator valued measure (POVM) elements.
    • Illustration using Wigner function formalism.

    Main Results:

    • Maximum detection efficiency of 37.6% achieved at 1558 nm telecom wavelength.
    • Low background noise of approximately 1.0 × 10-3 counts/pulse.
    • High internal quantum conversion efficiency reaching 84.4%.
    • Pronounced negativities in the Wigner function, indicating clear quantum features.
    • Demonstration of quantum decoherence behavior with varying pump powers.

    Conclusions:

    • The developed quantum detector exhibits high efficiency and low noise, crucial for quantum applications.
    • The Wigner function analysis confirmed the detector's quantum nature through significant negativities.
    • This quantum detector is a promising candidate for optical quantum state engineering, quantum information processing, and quantum communication.