Long-distance continuous-variable quantum key distribution with feasible physical noiseless linear amplifiers

• URL: http://arxiv.org/abs/2305.10976v2
• Date: Fri, 21 Jul 2023 09:06:36 GMT
• Title: Long-distance continuous-variable quantum key distribution with feasible physical noiseless linear amplifiers
• Authors: Michele N. Notarnicola and Stefano Olivares
• Abstract summary: Noiseless linear amplifiers (NLAs) provide a powerful tool to achieve long-distance continuous quantum key distribution. We address a NLA-assisted CVQKD protocol implemented via realistic physical NLAs.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: 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 $g^{\hat{n}}$. 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.

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