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

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JournalIEEE Journal on Selected Areas in Communication
DateAccepted/In press - 6 Jan 2020
DateE-pub ahead of print - 23 Jan 2020
DatePublished (current) - Mar 2020
Issue number3
Volume38
Number of pages11
Pages (from-to)506-516
Early online date23/01/20
Original languageEnglish

Abstract

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.

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    Research areas

  • quant-ph

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