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CV-QKD in Coexistence with 1 Gb/s Classical Channel Using Electrical Frequency Division Multiplexing | IEEE Conference Publication | IEEE Xplore

CV-QKD in Coexistence with 1 Gb/s Classical Channel Using Electrical Frequency Division Multiplexing


Abstract:

Quantum key distribution (QKD) leverages the principles of quantum mechanics to enable secure secret key exchange. Continuous-variable QKD (CV-QKD), utilizing coherent st...Show More

Abstract:

Quantum key distribution (QKD) leverages the principles of quantum mechanics to enable secure secret key exchange. Continuous-variable QKD (CV-QKD), utilizing coherent states and coherent detection, has emerged as a promising method, easily integrable into existing telecom networks. In this work, we study, through numerical simulation, the coexistence of a CV-QKD channel with a classical channel capable of up to 1 Gb/s. We first analyze the performance of the quantum channel when the classical channel emits a pure tone, by varying the frequency gap between both channels and adjusting their power ratios. Then, by maintaining a fixed electrical separation of 500 MHz, we study QPSK modulation with root-raised-cosine filtering in the classical channel. In this scenario, for several signal-to-noise ratios, we reduce crosstalk by optimizing filter properties such as roll-off factor, symbol rate and number of filter taps.
Date of Conference: 14-18 July 2024
Date Added to IEEE Xplore: 02 September 2024
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Conference Location: Bari, Italy

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