Raouf, Amir Hossein FahimSafari, M.Uysal, Murat2021-03-302021-03-302020978-1-7281-6743-5http://hdl.handle.net/10679/7414https://doi.org/10.1109/CSNDSP49049.2020.9249621Absorption, scattering, and turbulence experienced in underwater channels severely limit the range of quantum communications. In this paper, to overcome range limitations, we investigate a multi-hop underwater quantum key distribution (QKD) where intermediate nodes help the key distribution between the source and destination nodes. We consider deployment of passive-relays which simply redirect the qubits to the next relay node or receiver without any measurement. Based on nearfield analysis, we present the performance of relay-assisted QKD scheme in clear ocean under different atmospheric conditions. We further investigate the effect of system parameters (aperture size and detector field-of-view) on the achievable distance.enginfo:eu-repo/semantics/restrictedAccessConference paper10.1109/CSNDSP49049.2020.9249621Underwater opticsQuantum-key distributionMulti-hop systems2-s2.0-85097650914