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Polarization-maintaining design for satellite-based quantum communication terminals.

Jincai Wu, Liang Zhang, JianJun Jia

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    The Micius quantum communication satellite successfully preserved quantum light polarization in its optical systems. This breakthrough supports secure quantum communication via advanced polarization-maintaining technologies.

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    Area of Science:

    • Quantum communication technology
    • Satellite-based quantum experiments
    • Optical engineering for quantum systems

    Background:

    • The Micius satellite is the world's first quantum communication satellite.
    • Quantum communication relies heavily on maintaining the polarization of quantum light.
    • Specific polarization requirements exist for satellite and ground station quantum communication.

    Purpose of the Study:

    • To report the polarization preservation of quantum light within the Micius satellite's optical systems.
    • To detail the design and methods used to maintain polarization in quantum communication terminals.
    • To validate the performance of polarization-maintaining optical systems for quantum applications.

    Main Methods:

    • Utilizing three optical terminals: quantum entanglement source (QES), quantum entanglement transmitter (QET), and quantum key distribution transmitter (QKDT).
    • Implementing three specific polarization-maintaining methods in the optical design of the QKDT and QET.
    • Detailed description of the optical configurations for the QKDT and QET.

    Main Results:

    • Achieved polarization extinction ratios better than 500:1 for the QKDT and QET at 850 nm and 810 nm wavelengths.
    • Demonstrated successful polarization preservation of quantum light in the satellite's optical terminals.
    • Validated the effectiveness of the employed polarization-maintaining techniques.

    Conclusions:

    • The polarization-maintaining design of the Micius satellite's optical terminals is critical for successful quantum communication.
    • The achieved high polarization extinction ratios provide essential technical support for the satellite's scientific objectives.
    • This work advances the feasibility of satellite-based quantum communication networks.