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Space-bound optical source for satellite-ground decoy-state quantum key distribution.

Yang Li, Sheng-Kai Liao, Xie-Le Chen

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    |November 18, 2014
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    Summary

    A new space-bound decoy-state optical source enables satellite-ground quantum key distribution (QKD). This technology is a crucial step towards a global quantum-secured network, generating secure keys from low Earth orbit.

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    Area of Science:

    • Quantum communication
    • Satellite technology
    • Applied physics

    Background:

    • Global quantum-secured networks are approaching realization through satellite-ground quantum key distribution (QKD).
    • Engineering implementation of QKD systems is advancing rapidly.

    Purpose of the Study:

    • To develop and test a space-bound decoy-state optical source for satellite-ground QKD.
    • To verify the source's performance under space environmental conditions.

    Main Methods:

    • Manufactured specialized 850 nm laser diodes.
    • Developed an integrated optical source using these laser diodes.
    • Conducted space environment tests to validate performance.

    Main Results:

    • The optical source produces weak coherent pulses with a 100 MHz clock rate, 99.5% intensity stability, 99.7% polarization fidelity, and phase randomization.
    • Space environment tests yielded satisfactory performance results.
    • Emulated secure key generation of approximately 120 kbits per low Earth orbit satellite pass.

    Conclusions:

    • The developed decoy-state optical source is suitable for space-based QKD applications.
    • This advancement represents a significant step towards establishing a global quantum-secured network.
    • The system demonstrates the feasibility of generating substantial secure key rates from orbit.