Probabilistic amplitude shaping for continuous-variable quantum key distribution with discrete modulation over a wiretap channel
Articolo
Data di Pubblicazione:
2024
Citazione:
Probabilistic amplitude shaping for continuous-variable quantum key distribution with discrete modulation over a wiretap channel / M.N. Notarnicola, S. Olivares, E. Forestieri, E. Parente, L. Potì, M. Secondini. - In: IEEE TRANSACTIONS ON COMMUNICATIONS. - ISSN 0090-6778. - 72:1(2024 Jan 17), pp. 375-386. [10.1109/TCOMM.2023.3317259]
Abstract:
To achieve the maximum information transfer and face a possible eavesdropper, the samples transmitted in continuous-variable quantum key distribution (CV-QKD) protocols are to be drawn from a continuous Gaussian distribution. As a matter of fact, in practical implementations the transmitter has a finite (power) dynamics and the Gaussian sampling can be only approximated. This requires the quantum protocols to operate at small powers. In this paper, we show that a suitable probabilistic amplitude shaping of a finite set of symbols allows to approximate at will the optimal channel capacity also for increasing average powers. We investigate the feasibility of this approach in the framework of CV-QKD, propose a protocol employing discrete quadrature amplitude modulation assisted with probabilistic amplitude shaping, and we perform the key generation rate analysis assuming a wiretap channel and lossless homodyne detection.
Tipologia IRIS:
01 - Articolo su periodico
Elenco autori:
M.N. Notarnicola, S. Olivares, E. Forestieri, E. Parente, L. Potì, M. Secondini
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