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Related Concept Videos

IR Frequency Region: X–H Stretching01:24

IR Frequency Region: X–H Stretching

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In IR spectroscopy, signals produced by the X−H bonds (such as C−H, O−H, or N−H) can be observed in the frequency range of  2700–4000 cm–1. The C−H stretching vibration forms sharp bands in the region 2850–3000 cm–1. The presence of the O−H stretching vibration leads to the forming of an absorption band in the frequency range 3650–3200 cm−1. At the same time, N−H stretching can be confirmed by absorption bands in...
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Related Experiment Video

Updated: Feb 20, 2026

Generation and Coherent Control of Pulsed Quantum Frequency Combs
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Generation and Coherent Control of Pulsed Quantum Frequency Combs

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1 × N DWDM channel selective quantum frequency conversion.

Tomoaki Arizono, Toshiki Kobayashi, Shigehito Miki

    Optics Express
    |February 18, 2026
    PubMed
    Summary
    This summary is machine-generated.

    We developed channel-selective quantum frequency conversion (CS-QFC) for quantum internet. This technology enables dynamic routing of photons across dense wavelength division multiplexing (DWDM) channels, crucial for high-capacity quantum networks.

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    A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference
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    A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference

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    Area of Science:

    • Quantum communication networks
    • Quantum information science
    • Photonics and optical communications

    Background:

    • Dense wavelength division multiplexing (DWDM) is vital for high-capacity quantum networks.
    • Quantum frequency conversion (QFC) is essential for integrating quantum systems over fiber optics.
    • Existing QFC methods lack the flexibility needed for future quantum internet.

    Purpose of the Study:

    • To present a novel channel-selective quantum frequency conversion (CS-QFC) technique.
    • To enable dynamic photon routing across DWDM channels for quantum internet applications.
    • To demonstrate CS-QFC using difference frequency generation in a PPLN waveguide.

    Main Methods:

    • Utilized difference frequency generation in a periodically poled lithium niobate (PPLN) waveguide.
    • Employed dynamically selected pump lasers to achieve channel-selective conversion.
    • Demonstrated conversion from 780 nm to 1540 nm using pump lasers around 1580 nm with 25 GHz spacing.

    Main Results:

    • Achieved an output-frequency tunability of 2.5 THz, enabling a 100-channel DWDM dynamic link.
    • Successfully routed photon pairs into seven distinct DWDM channels.
    • Preserved nonclassical cross-correlation functions and observed no crosstalk between channels.

    Conclusions:

    • CS-QFC is a viable technology for building frequency-multiplexed quantum networks.
    • The demonstrated CS-QFC system supports flexible and scalable quantum communication.
    • This work paves the way for advanced quantum internet infrastructure.