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Polarization-basis tracking scheme for quantum key distribution using revealed sifted key bits.

Yu-Yang Ding, Wei Chen, Hua Chen

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    This summary is machine-generated.

    A new polarization-basis tracking scheme (PBTS) enables continuous calibration in quantum key distribution. This method uses existing key bits, enhancing security and efficiency without interrupting quantum signal transmission.

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    Area of Science:

    • Quantum Information Science
    • Quantum Communication Security
    • Experimental Physics

    Background:

    • Accurate polarization basis calibration is crucial for secure quantum key distribution (QKD).
    • Existing polarization-basis tracking schemes (PBTS) often require interrupting quantum signal transmission or using additional reference light, impacting efficiency and security.
    • Continuous calibration is needed to maintain system performance and minimize security risks.

    Purpose of the Study:

    • To develop and demonstrate a single-photon level, continuously working polarization-basis tracking scheme (PBTS).
    • To improve the efficiency and security of quantum key distribution systems by enabling real-time polarization calibration.
    • To validate the proposed PBTS in a practical fiber channel setting.

    Main Methods:

    • Proposed a novel PBTS operating at the single-photon level.
    • Utilized only sifted key bits revealed during the error correction procedure for calibration.
    • Integrated the PBTS into a polarization-encoding BB84 QKD system.
    • Conducted experiments over a 50 km fiber channel for 24 hours of continuous operation.

    Main Results:

    • Achieved continuous operation of the PBTS without interrupting quantum signal transmission.
    • Obtained an average quantum bit error rate (QBER) of 2.32% over 24 hours.
    • Recorded a standard deviation of 0.87% for the QBER, indicating stable performance.
    • Demonstrated the effectiveness of the scheme in a real-world fiber channel.

    Conclusions:

    • The proposed single-photon level PBTS effectively enables continuous calibration in QKD systems.
    • The scheme enhances system efficiency and security by avoiding transmission interruptions and additional reference light.
    • The stable and low QBER results validate the practical applicability and reliability of the developed PBTS.