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Generation and Coherent Control of Pulsed Quantum Frequency Combs
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Reconfigurable metasurfaces to realize BB84 protocol for wireless quantum communication.

Qi Yuan, Jinming Jiang, Xingyin Guan

    Optics Express
    |August 13, 2025
    PubMed
    Summary

    This study demonstrates the first wireless quantum key distribution (QKD) using metasurfaces, enhancing BB84 protocol security and stability for quantum communication. Metasurfaces offer a secure and versatile platform for future wireless quantum information transmission.

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    Area of Science:

    • Electromagnetics
    • Quantum Information Science
    • Materials Science

    Background:

    • Metasurfaces offer advanced control over electromagnetic waves for wireless communication.
    • Traditional wireless communication faces security vulnerabilities due to eavesdropping.
    • Quantum Key Distribution (QKD) provides secure communication but faces challenges with conventional single-photon manipulation and channel stability.

    Purpose of the Study:

    • To implement the first wireless transmission of quantum information using the BB84 protocol with metasurfaces.
    • To enhance the security and stability of quantum communication channels.
    • To explore the multidisciplinary potential of metasurfaces in wireless communication.

    Main Methods:

    • Utilized metasurfaces to generate and manipulate four conjugated quantum states.
    • Implemented a conveyor-type switching method for demonstrating the BB84 protocol.
    • Conducted experiments and simulations at approximately 10 GHz and beyond.

    Main Results:

    • Achieved high-fidelity holographic results for wireless quantum information transmission.
    • Demonstrated the BB84 protocol using metasurfaces as a stable and secure channel.
    • Validated the performance through both experimental and simulation data.

    Conclusions:

    • Metasurfaces provide a robust platform for implementing wireless BB84 QKD.
    • This approach offers enhanced security and stability compared to traditional QKD methods.
    • Switchable metasurfaces enable diverse applications including intelligent reflectors and reconfigurable antennas.