Discrete-modulation continuous-variable quantum key distribution enhanced by quantum scissors

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It is known that quantum scissors, as non-deterministic amplifiers, can enhance the performance of Gaussian-modulated continuous-variable quantum key distribution (CV-QKD) in noisy and long-distance regimes of operation. Here, we extend this result to a {\em non-Gaussian} CV-QKD protocol with discrete modulation. We show that, by using a proper setting, the use of quantum scissors in the receiver of such discrete-modulation CV-QKD protocols would allow us to achieve positive secret key rates at high loss and high excess noise regimes of operation, which would have been otherwise impossible. This also keeps the prospect of running discrete-modulation CV-QKD over CV quantum repeaters alive.
Original languageEnglish
Pages (from-to)506-516
Number of pages11
JournalIEEE Journal on Selected Areas in Communication
Issue number3
Early online date23 Jan 2020
Publication statusPublished - Mar 2020

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  • quant-ph

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