2025/05/07 by Mehmet Emre Taşgın, Tasgin, Mehmet Emre
Engineering · Materials Science · #Plasmonic and Surface Plasmon Research #Molecular Communication and Nanonetworks #Gold and Silver Nanoparticles Synthesis and Applications
paper · pdf · doi:10.48550/arxiv.2505.04516
Surface plasmon polaritons (SPPs) are known to preserve quantum optical properties --such as squeezing-- over distances far exceeding those of classical field amplitudes. However, the surviving squeezing typically becomes so weak that its detection requires prohibitively large numbers of measurements. Here we introduce a fundamentally new paradigm for plasmonic communication in which nonclassicality itself carries the information. We (i) encode classical data (bits or dits) directly into the \it degree of nonclassicality (e.g., squeezing) of SPPs, thereby enabling information transfer over distances where classical amplitude encoding fails. We further (ii) show that this information can be retrieved from long-lived correlations generated at the readout stage via a beam splitter. Crucially, we demonstrate that (iii) encoding on initially noisy states leads to a counterintuitive enhancement: the encoded information remains accessible after long propagation distances using only a few measurements, outperforming both squeezed vacuum and amplitude-based schemes by orders of magnitude. Finally, (iv) in the THz regime --relevant for graphene and carbon-nanotube platforms at room temperature-- we exploit, rather than suppress, the intrinsic thermal background, enabling robust, high-bandwidth nanoscale communication.