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High efficiency in mode-selective frequency conversion.

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    This summary is machine-generated.

    Time-ordering corrections limit frequency conversion efficiency. Cascaded protocols attenuate these corrections, enhancing quantum information processes. This work reveals new ways to optimize frequency conversion.

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    Area of Science:

    • Quantum optics
    • Quantum information science

    Background:

    • Frequency conversion (FC) is crucial for quantum information protocols.
    • Single-photon, mode-selective FC efficiencies are experimentally limited to approximately 80%.

    Purpose of the Study:

    • To explain the efficiency limitations in FC as time-ordering corrections (TOCs).
    • To demonstrate how cascaded FC protocols and similar architectures can overcome these limitations.
    • To explore the potential of TOCs for enhancing partially mode-selective FC.

    Main Methods:

    • Theoretical analysis of joint conversion amplitude.
    • Scaling arguments for cascaded FC protocols.
    • Application of the Magnus expansion.

    Main Results:

    • Efficiency limits in FC are attributed to time-ordering corrections (TOCs).
    • Cascaded FC protocols effectively attenuate TOCs, overcoming efficiency limitations.
    • Similar cascaded architectures can be applied to spontaneous parametric downconversion.
    • TOCs can be leveraged to enhance conversion efficiency in partially mode-selective FC.

    Conclusions:

    • Time-ordering corrections are identified as the primary cause of efficiency limitations in frequency conversion.
    • Cascaded architectures offer a viable method for attenuating TOCs in both frequency conversion and spontaneous parametric downconversion.
    • A novel approach is presented to utilize TOCs for improving conversion efficiency in specific FC regimes.