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Time and frequency -Domain Interpretation of Phase-lead Control01:24

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Phase-lead controllers are commonly used in various control systems to enhance response speed and stability. Adjusting the brightness on a television screen offers a practical example of phase-lead control. When contrast is enhanced, a phase-lead controller is employed. Mathematically, phase-lead control is identified when the first parameter is smaller than the second.
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Phase-lag controllers are widely used in control systems to improve stability and reduce steady-state errors. A dimmer switch controlling the brightness of a light bulb serves as a practical example of phase-lag control, gradually adjusting the bulb's brightness. Mathematically, phase-lag control or low-pass filtering is represented when the factor 'a' is less than 1.
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Related Experiment Video

Updated: Jun 10, 2025

Generation and Coherent Control of Pulsed Quantum Frequency Combs
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Multiplexed quantum frequency conversion.

Chao Tang, Zhaohui Ma, Zhan Li

    Optics Letters
    |October 15, 2024
    PubMed
    Summary
    This summary is machine-generated.

    We demonstrate multiplexed quantum frequency conversion (m-QFC) using a single periodically poled lithium niobate waveguide. This efficient telecom-band upconversion preserves quantum correlations, enabling applications in quantum communication and computing.

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    Area of Science:

    • Quantum optics
    • Nonlinear optics
    • Integrated photonics

    Background:

    • Multiplexed quantum frequency conversion (m-QFC) enables simultaneous processing of multiple quantum signals.
    • Integrated photonic devices are crucial for scalable quantum technologies.

    Purpose of the Study:

    • To demonstrate efficient m-QFC in the telecom band using a single waveguide.
    • To assess the preservation of quantum correlations after m-QFC.

    Main Methods:

    • Utilized a three-peak periodically poled lithium niobate (PPLN) waveguide.
    • Employed a single pump beam for simultaneous upconversion of multiple signal wavelengths.
    • Tested the system with a multichannel photon-pair source.

    Main Results:

    • Achieved internal conversion efficiencies up to 73.6% in the telecom band.
    • Demonstrated preservation of quantum correlations with a high coincidence-to-accidental ratio of 767.
    • Showcased the viability of m-QFC on a single PPLN waveguide.

    Conclusions:

    • The demonstrated m-QFC device offers a practical approach for quantum information processing.
    • This technology supports advancements in multiplexed quantum key distribution, quantum sensing, and quantum computing.