Probabilistic amplitude shaping for continuous-variable quantum key distribution with discrete modulation over a wiretap channel
| Autor: | Notarnicola, Michele N., Olivares, Stefano, Forestieri, Enrico, Parente, Emanuele, Potì, Luca, Secondini, Marco |
|---|---|
| Rok vydání: | 2022 |
| Předmět: | |
| Zdroj: | IEEE Trans. Commun. 72, 375--386 (2024) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1109/TCOMM.2023.3317259 |
| Popis: | 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. Comment: 12 pages, 9 figures |
| Databáze: | arXiv |
| Externí odkaz: |
|