Noiseless linear amplifiers (NLAs) provide a powerful tool to achieve long-distance continuous-variable quantum key distribution (CV-QKD) in the presence of realistic setups with non unit reconciliation efficiency. We address a NLA-assisted CV-QKD protocol implemented via realistic physical NLAs, namely, quantum scissors (QS) and single-photon catalysis (SPC), and compare their performance with respect to the ideal NLA gn^. We investigate also the robustness of two schemes against inefficient conditional detection, and discuss the two alternative scenarios in which the gain associated with the NLA is either fixed or optimized.
@article{arxiv.2305.10976,
title = {Long-distance continuous-variable quantum key distribution with feasible physical noiseless linear amplifiers},
author = {Michele N. Notarnicola and Stefano Olivares},
journal= {arXiv preprint arXiv:2305.10976},
year = {2023}
}