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• W3006818553 abstract "Abstract The secret key rate of a continuous-variable quantum key distribution (CV-QKD) system is limited by excess noise. A key issue typical to all modern CV-QKD systems implemented with a reference or pilot signal and an independent local oscillator is controlling the excess noise generated from the frequency and phase noise accrued by the transmitter and receiver. Therefore accurate phase estimation and compensation, so-called carrier recovery, is a critical subsystem of CV-QKD. Here, we explore the implementation of a machine learning framework based on Bayesian inference, namely an unscented Kalman filter (UKF), for estimation of phase noise and compare it to a standard reference method and a previously demonstrated machine learning method. Experimental results obtained over a 20-km fibre-optic link indicate that the UKF can ensure very low excess noise even at low pilot powers. The measurements exhibited low variance and high stability in excess noise over a wide range of pilot signal to noise ratios. This may enable CV-QKD systems with low hardware implementation complexity which can seamlessly work on diverse transmission lines." @default.
• W3006818553 created "2020-03-06" @default.
• W3006818553 creator A5025311119 @default.
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• W3006818553 date "2021-02-04" @default.
• W3006818553 modified "2023-09-30" @default.
• W3006818553 title "Machine learning aided carrier recovery in continuous-variable quantum key distribution" @default.
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• W3006818553 doi "https://doi.org/10.1038/s41534-021-00361-x" @default.
• W3006818553 hasPublicationYear "2021" @default.
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