Work

Security of binary-modulated optical key distribution against quantum-enhanced coherent eavesdropping

Year: 2026

Type: article

Abstract: Optical key distribution protects the physical layer of communication links by taking advantage of the inherent noise present in the photodetection process. It allows for efficient generation of a shared random key between two distant users that is secure against passive eavesdropping and can be subsequently used for cryptographic purposes. Moreover, it can be straightforwardly implemented over standard intensity modulation and direct detection links, making it an attractive alternative to quantum key distribution. Here we present a comprehensive security analysis against more powerful eavesdroppers possessing the ability to perform either coherent detection, or even quantum-optimal measurements on the intercepted transmission.

Source: New Journal of Physics

DOI: 10.1088/1367-2630/ae8a75

Authors: Karol Łukanowski, Michał Wójcik, Stefano Olivares, Konrad Banaszek, Marcin Jarzyna

Institutions: University of Warsaw, Istituto Nazionale di Fisica Nucleare, University of Milan

Language: English

Topic: Quantum Information and Cryptography

Subfield: Artificial Intelligence

Field: Computer Science

Domain: Physical Sciences

Open Access status: gold

Estimated APC paid: $2,610

Funders: European Commission, Fundacja na rzecz Nauki Polskiej, European Regional Development Fund