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Measurement of Quantum Interference in a Silicon Ring Resonator Photon Source
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Strengthening practical continuous-variable quantum key distribution against measurement angular error.

Tao Shen, Yundi Huang, Xiangyu Wang

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    Summary
    This summary is machine-generated.

    Measurement angular error in continuous-variable quantum key distribution (CV-QKD) systems degrades security. A proposed calibration method effectively compensates for this error, enhancing practical CV-QKD system performance.

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    Area of Science:

    • Quantum Information Science
    • Quantum Cryptography
    • Optical Physics

    Background:

    • Continuous-variable quantum key distribution (CV-QKD) systems with heterodyne detection require optical phase shifters to rotate the local oscillator phase.
    • Practical optical phase shifters deviate from ideal devices, introducing measurement angular error that compromises system security.

    Purpose of the Study:

    • To provide a concrete interpretation of measurement angular error in practical CV-QKD systems.
    • To analyze the impact of this error on security parameters and the secret key rate.
    • To propose and demonstrate a method for estimating and compensating for measurement angular error.

    Main Methods:

    • Developing an entanglement-based description of measurement angular error.
    • Deducing the effects of error on excess noise and transmittance through parameter estimation.
    • Proposing and detailing a practical security analysis incorporating error estimation and compensation.

    Main Results:

    • Measurement angular error leads to overestimated excess noise and underestimated transmittance.
    • These parameter estimations result in a reduced final secret key rate.
    • The proposed estimation method accurately identifies the measurement angular error.

    Conclusions:

    • Measurement angular error significantly degrades the security of practical CV-QKD systems.
    • The developed calibration and compensation method substantially improves the performance of these systems.