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    We demonstrate a novel single-photon frequency converter using a giant atom and waveguide. This device achieves perfect directional frequency conversion and supports multiple channels for quantum networking.

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    Area of Science:

    • Quantum optics
    • Atomic physics
    • Nanophotonics

    Background:

    • Single-photon frequency conversion is crucial for quantum information processing.
    • Existing methods often require complex chiral structures.
    • Giant atoms offer unique light-matter interaction properties.

    Purpose of the Study:

    • To propose a directional single-photon frequency converter.
    • To achieve frequency conversion without chiral waveguides.
    • To enable flexible control over photon direction and frequency.

    Main Methods:

    • Utilizing a giant Λ-type atom coupled to a T-shaped waveguide.
    • Engineering quantum interference via local coupling phase control.
    • Analyzing both Markovian and non-Markovian regimes.

    Main Results:

    • Perfect directional frequency conversion was achieved.
    • Multiple directional conversion channels were supported.
    • Retardation effects in the non-Markovian regime opened distinct frequency conversion windows.

    Conclusions:

    • The proposed phase-controlled, multi-frequency architecture is a versatile platform for quantum routing.
    • This approach offers flexible control over photon direction and frequency.
    • It paves the way for frequency-multiplexed quantum networking.