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Generation and Coherent Control of Pulsed Quantum Frequency Combs
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Entanglement distribution using a biphoton frequency comb compatible with DWDM technology.

Rintaro Fujimoto, Tomohiro Yamazaki, Toshiki Kobayashi

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    |October 19, 2022
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    Summary
    This summary is machine-generated.

    We developed a method to distribute 16 channels of polarization-entangled photon pairs using a biphoton frequency comb. This technique is compatible with dense wavelength division multiplexing (DWDM) for quantum communication.

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    Area of Science:

    • Quantum Information Science
    • Quantum Optics
    • Photonics

    Background:

    • Quantum entanglement distribution is crucial for quantum networks.
    • Current methods face challenges with channel capacity and crosstalk.
    • Dense Wavelength Division Multiplexing (DWDM) offers a scalable solution for optical communication.

    Purpose of the Study:

    • To demonstrate frequency-multiplexed distribution of polarization-entangled photon pairs.
    • To leverage a biphoton frequency comb for enhanced channel isolation.
    • To assess the compatibility with existing DWDM technology.

    Main Methods:

    • Utilizing spontaneous parametric down-conversion (SPDC) within a cavity to generate a biphoton frequency comb.
    • Employing demultiplexers to separate photon pairs across 16 distinct frequency channels with 25 GHz spacing.
    • Confining one photon of the pair within the cavity to achieve narrow linewidths.

    Main Results:

    • Successfully distributed polarization-entangled photon pairs over 16 frequency channels.
    • Achieved high photon pair fidelities ranging from 81% to 96% across all channels.
    • Demonstrated minimized channel crosstalk due to narrow photon linewidths and cavity properties.

    Conclusions:

    • The biphoton frequency comb is an effective source for frequency-multiplexed entanglement distribution.
    • The demonstrated method is compatible with DWDM systems, paving the way for scalable quantum communication.
    • This approach significantly enhances the capacity for distributing quantum entanglement over optical networks.