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Experimental free-space quantum key distribution with efficient error correction.

Wei-Yue Liu, Xian-Feng Zhong, Teng Wu

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    |August 10, 2017
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    This study demonstrates satellite-ground quantum key distribution (QKD) over 17 km, achieving 0.5 kbps using Turbo Code for efficient error correction. Turbo Code shows improved performance with higher quantum bit error rates (QBER).

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    Area of Science:

    • Quantum Information Science
    • Quantum Communication Technology
    • Free-Space Optics

    Background:

    • Satellite-ground quantum key distribution (QKD) is crucial for secure global communication networks.
    • Existing error correction methods like Cascade can be inefficient for satellite-based QKD systems.

    Purpose of the Study:

    • To experimentally validate a 17-km free-space QKD link simulating satellite-ground conditions.
    • To evaluate the performance of Turbo Code as an efficient error correction algorithm for satellite-ground QKD.

    Main Methods:

    • Utilized an engineering model of a space-bound optical transmitter and a dedicated ground station.
    • Implemented Turbo Code for error correction, comparing its efficiency with the Cascade algorithm.
    • Measured the final key rate and quantum bit error rate (QBER) over a 17-km free-space link.

    Main Results:

    • Achieved a final key rate of approximately 0.5 kbps with a QBER of ~3.4%.
    • Demonstrated that Turbo Code provides high-efficiency error correction with a single data exchange.
    • Showcased Turbo Code's superior performance in final key rates compared to Cascade as QBER increases.

    Conclusions:

    • The experiment confirms the feasibility of establishing satellite-ground QKD links.
    • Turbo Code is a highly efficient error correction method for satellite-ground quantum communication, especially at higher QBERs.