Work

Experimental direct quantum communication with squeezed states

Year: 2025

Type: article

Abstract: Quantum secure direct communication (QSDC) is an evolving quantum communication framework based on transmitting secure information directly through a quantum channel, without relying on key-based encryption such as in quantum key distribution (QKD). Optical QSDC protocols, utilizing discrete and continuous variable encodings, show great promise for future technological applications. We present the first table-top continuous-variable QSDC proof of principle, analyzing its implementation and comparing the use of coherent against squeezed light sources. A simple beam-splitter attack is analyzed by using Wyner wiretap channel theory. Our study illustrates the advantage of squeezed states over coherent ones for enhanced security and reliable communication in lossy and noisy channels. Our practical implementation, utilizing mature telecom components, could foster secure quantum metropolitan networks compatible with advanced multiplexing systems.

Source: Optics Express

DOI: 10.1364/oe.538593

Authors: Iris Paparelle, Faezeh Mousavi, Francesco Scazza, Angelo Bassi, Matteo Paris, Alessandro Zavatta

Institutions: University of Trieste, National Institute of Optics, University of Milan, University of Florence

Language: English

Topic: Quantum Information and Cryptography

Subfield: Artificial Intelligence

Field: Computer Science

Domain: Physical Sciences

Open Access status: gold

Estimated APC paid: $2,270