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Generation and Coherent Control of Pulsed Quantum Frequency Combs
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Narrowband photon pair source for quantum networks.

F Monteiro, A Martin, B Sanguinetti

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    Summary
    This summary is machine-generated.

    We developed a compact photon pair source using a nonlinear crystal in a short cavity. This efficient, low-loss source is compatible with telecommunication networks, enabling advanced quantum communication.

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    Area of Science:

    • Quantum optics
    • Nonlinear optics
    • Photonics

    Background:

    • Efficient generation of high-purity photon pairs is crucial for quantum communication networks.
    • Existing sources often lack compatibility with standard telecommunication infrastructure.

    Purpose of the Study:

    • To demonstrate a compact and efficient photon pair source.
    • To ensure compatibility with telecommunication networks, particularly ultra-dense wavelength division multiplexing (U-DWDM) channels.

    Main Methods:

    • Utilizing a periodically poled lithium niobate nonlinear crystal within a short optical cavity.
    • Optimizing cavity parameters for efficient mode selection and low loss.

    Main Results:

    • Achieved a photon source brightness of 134 pairs/(s·mW·MHz).
    • Demonstrated photons with a coherence time of 8.6 ns (116 MHz) and high purity.
    • Ensured emitted photon pair modes match U-DWDM channel spacings.

    Conclusions:

    • The developed source offers high purity and efficiency.
    • Its compatibility with standard telecom networks makes it suitable for complex quantum communication systems.