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Updated: Feb 19, 2026

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    Area of Science:

    • Quantum optics
    • Optical engineering

    Background:

    • The Micius quantum satellite requires precise polarization control for secure quantum communication.
    • Reflective telescope designs can introduce polarization errors.

    Purpose of the Study:

    • To analyze the polarization evolution in a reflective telescope for the Micius satellite.
    • To determine the impact of incidence angle on polarization extinction ratio (PER).
    • To validate the optical design through theoretical and experimental evaluation.

    Main Methods:

    • Derivation and calculation of PER changes for quantum light.
    • Modeling PER deterioration with increasing incidence angles.
    • Theoretical analysis and experimental testing of the Micius prototype.

    Main Results:

    • PER deterioration was quantified based on incidence angle.
    • Experimental PER values ranged from 38 to 55 dB.
    • Results showed good agreement between numerical calculations and experimental data.

    Conclusions:

    • The optical design for the Micius reflective telescope is viable.
    • The study supports the development of a global quantum security network.